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کتاب مکانیک شکست و خستگی نوشته رحمت الله قاجار, توسط انتشارات دانشگاه صنعتی خواجه نصیرالدین طوسی به چاپ رسیده است.
موضوع کتاب: مهندسی مکانیک, ضرورت مکانیک شکست و چکیده آن, دینامیک و توقف ترک

 

 

 

 


 

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Journal Papers

  1. Ghajar R., Saka, M., Sugawara T., Abe, H. Komura I. and Sakamoto H.,"NDE of multiple cracks on the surface of materials by means of the potential drop technique", J. NDT & E International 27, No. 3, pp 143-150, 1994.
  2. Ghajar R., Saka M., Sugawara T., Abe H., Komura I. and Sakamoto H., "Simplified NDE of multiple cracks by means of potential drop technique", J. NDT & E International 27 No. 1 pp 23-28, 1995.
  3. Ghajar R. “Crack interaction in NDE of multiple cracks by means of the potential drop technique", J. NDT & E International 36, pp 581-585, 2003.
  4. Ghajar R. and Sadeghi A., “Stress analysis in crank shaft of reciprocal compressor”, Automotive Scientific Magazine, No. 8, winter 2003. (in Persian)
  5. Ghajar R. "An alternative method for crack interaction in NDE of multiple cracks by means of potential drop technique", J. NDT & E International, 37, pp 539-544, 2004.
  6. R. Ghajar, and G.R. Rashed,”Analysis and determination of the principal factor for the abnormal drill-string failure in Gachsaran and Bibihakimeh oil fields of Iran”, J. of Faculty of Engineering, Vol. 39, No. 1, May 2005. (in Persian)
  7. Rashed G.R., Ghajar R. and Hashemi S.J. ,”Evaluation of multiaxial fatigue life prediction model based on critical plane for notched specimen”, Int. J. Damage Mechanics, Sep. 2006, Vol. 17, pp. 419-445.
  8. G.R. Rashed, and R. Ghajar,”Influence of drillship roll on the drillpipe fatigue under variable amplitude loading”, J. of Marine Engineering, Vol. 3, No. 5, Winter 2006. (in Persian)
  9. Rashed G.R., Ghajar R. and Farrahi G.,”Multiaxial stress-strain modeling and effect of additional hardening due to nonproportional loading”, J. Mechanical Science and Technology, Vol. 21., 2007.
  10. G.R. Rashed, R. Ghajar, and S.J. Hashemi, ” An analytical model for the prediction of drill pipe fatigue life”, J. of Faculty of Engineering, Vol. 41, No. 4, Nov. 2007. (in Persian)
  11. R. Ghajar, G.R. Rashed, and S.J. Hashemi, ”Assessment of the existing models to estimate the fatigue life under both multiaxial in phase and 90 out of phase loading conditions”, J. of Aerospace Science and Technology (JUST), Vol. 4, No. 3, 2007.
  12. R. Ghajar, J. Alizadeh K., “Analysis of the Iranian railway Wheel-Rail contact”, Journal of Mechanical Engineering, Vol. 76, pp. 46-55, 2008. (In Persian)
  13. M. Sadeghinia, S.M. Khalili and R. Ghajar, ”Impact behavior of cracked plate repaired with composite and FML patches”, J. Advanced Materials Research, Vols. 47-50, 2008.
  14. S.M.R. Khalili, R. Ghajar, M. Sadeghinia, and R.K. Mital, ”An experimental study on the Charpy impact response of cracked aluminum plates repaired with GFRP or CFRP composite patches”, J. Composite Structures, Vol. 89, Issue 2, June 2009, pp 270-274.
  15. M. Shariyat, R. Ghajar, D.D. Ganji, and M. M. Alipour “An analytical solution for low velocity impact response analysis of a plate supported by a rigid substrate”, Int. J. of Modern Physics B (IJMPB, accepted on Jun 23, 2009.
  16. R. Ghajar, P. Gervehi, “Optimization of autofrettage process in thick-walled cylinder for elastic-plastic linear strain hardening material”, Journal of Mechanical Engineering (University of Tabriz) Vol. 39, No. 1 (2009). (In Persian)
  17. R. Ghajar, J. Alizadeh K. “Prediction of the subsurface crack growth lifetime in railroad wheel of the Iranian railway system”, International Journal of Advanced Design and Manufacturing Technology, Vol. 13, pp. 11-24, 2010. (In Persian)
  18. R. Ghajar, and S. M. Nabavi, “Closed form thermal stress intensity factors for an internal circumferential crack in a thick-walled cylinder”, J. Fatigue & Fracture of Engineering Materials & Structures, Vol. 33, 2010, pp 504-512.
  19. S. M. Nabavi, and R. Ghajar, “Analysis of thermal stress intensity factors for cracked cylinders using weight function method”, Int. Journal of Engineering Science, 48 (2010) 1811–1823.
  20. R. Ghajar, and J. Alizadeh K., “Investigation of rolling contact fatigue in railway rails”, J. of Jadeh, A Scientific Prompting quarterly Magazine in field of the road and transportation Engineering, Vol. 67, pp. 69-78, 2011. (in Persian)
  21. Shaghaghi Moghaddam, A., Ghajar, R., Alfano, M., “Finite element evaluation of stress intensity factors in curved non-planar cracks in FGMs.”, Mechanics Research Communications 38 (2011) 17–23.
  22. Ghajar, R., Shaghaghi Moghaddam, A., Alfano, M, “An improved numerical method for computation of stress intensity factors along 3D curved non-planar cracks in FGMs”, International Journal of Solids and Structures 48 (2011) 208–216.
  23. Ghajar, R., Shaghaghi Moghaddam, “Numerical investigation of the mode III stress intensity factors in FGMs considering the effect of graded Poisson’s ratio”, Engineering Fracture Mechanics 78 (2011) 1478-1486.
  24. R. Ghajar, N. Naserifar, H. Sadati and J. Alizadeh K., “A neural network approach for predicting steel properties characterizing cyclic Ramberg-Osgood equation”, Fatigue & Fracture of Engineering Materials & Structures, 34 (2011) 534-544.
  25. A, Moghanizadeh, F. Honarvar, M. Ghoreishi, R. Ghajar, “An investigation of parameters affecting the quality of resistance spot welds in low carbon steel sheets”, Aero Space Mechanics Journal, Vol. 9, No. 4 (Winter 2011), 1-9. (in Persian)
  26. R. Ghajar, S. Mehrabiani, “Thermo-mechanical analysis of thick-walled cylinders with internal functionally graded coating with consideration of thermal residual stresses”, Journal of Mechanical Engineering (University of Tabriz) Vol. 40, No. 2 (2011), 57-66. (in Persian)
  27. J. Alizadeh K., R. Ghajar, H. Tavakkoli, “Modeling and dynamic analysis of high speed Iranian coach”, Journal of Transportation Engineering, Vol.10, pp. 125-141, 2011. (in Persian)
  28. R. Ghajar, F. Karimi, J. Alizadeh K., “Investigation of the fatigue and fracture in the wheel-rail contact”, J. of Jadeh, A Scientific Prompting quarterly Magazine in field of the road and transportation Engineering, Vol. 72, pp. 253-262, 2011. (in Persian)
  29. R. Ghajar, J. Alizadeh K., M. Nemati, Y. Alizadeh, “Determination of fracture toughness of rail UIC60 steel using Charpy impact test in different temperatures”, Journal of Transportation Engineering, Vol. 7, pp. 249-259, 2011. (in Persian)
  30. R. Ghajar, S. Peyman, J. Alizadeh K., “A new strain based model for predicting multiaxial fatigue life of metals”, J. of Solid Mechanics in Eng. Vol. 9, pp. 17-25, 2011. (in Persian)
  31. J. Alizadeh, R. Ghajar, “Analysis of wheel-rail contact in the Iranian railway”, J. of Iranian society of mechanical engineers, No. 87, (2011) 46-55. (in Persian)
  32. Ghajar, R., Niknami, A., “Residual strength degradation of graphite under thermal shock fatigue”, International Journal of Mechanical Science 59 (2012) 55-60.
  33. Shariyat, M., Ghajar, R., Alipour, M. M., “An analytical solution for a low velocity impact between a rigid sphere and a transversely isotropic strain-hardening plate supported by a rigid substrate”, J. Eng. Math. 75 (2012) 107-125.
  34. Mirone, G., Keshavarz, A., Ghajar, R., “Triaxiality factor and Lode angle effects on failure of X-100 steel considering plastic anisotropy”, Int. J. Advanced Design and Manufacturing Technology, Vol. 5, No. 4, September – 2012, 27-31.
  35. Ghajar R., Mirone G., Keshavarz A., “Sensitivity analysis on triaxiality factor and Lode angle in ductile fracture”, Journal of Mechanics, Vol. 29, No. 1, 2013, 177-184.
  36. Ghajar, R., Mirone, G., Keshavarz, A, “Ductile failure of X100 pipeline steel –experiment and fractography”, Material and Design 43 (2013) 513-525.
  37. Yarrmohammad Tooski, M., Alderliesten, R. C., Ghajar, R., Khalili, S. M. R., “Experimental investigation on distance effects in repeated low velocity impact on fiber–metal laminates”, Composite Structures, Vol. 99, No. 4, 2013, 31-40.
  38. Shaghaghi Moghaddam, A., Alfano, M., Ghajar, R., “Determining the mixed mode stress intensity factors of surface cracks in functionally graded hollow cylinders”, Materials & Design, 43 (2013) 475-484.
  39. Ghajar, R., Saeidi Googarchin H., “General point load weight function for semi-elliptical crack in finite thickness plates”, Engineering Fracture Mechanics 109 (2013) 33-44.
  40. R. Ghajar, S.M.N. Ghoreishi, “Numerical analysis of hydrodynamic interaction between the linear waves of Caspian Sea and Amirkabir semi-submersible drilling platform”, Engineering Solid Mechanics 1 (2013) 141-148.
  41. R. Ghajar, and J. Alizadeh K., “Mixed mode stress intensity factors for elliptical surface cracks in an elastic half-space subjected to a uniform normal loading”, Fatigue & Fracture of Engineering Materials & Structures, 34 (2013) 1199-1208.
  42. R. Ghajar, M. Abbaspour Niasani, H. Saeidi Googarchin, “Explicit expressions of stress intensity factor for external semi-elliptical circumferential cracks in a cylinder under mechanical and thermal loads”, J. Modares Mechanical Engineering, 14(9), Dec. 2014, pp. 90-98. (in Persian)
  43. R. Ghajar, H. Saeidi Googarchin, “Investigation of pressure gradient effect on stress intensity factor variations in autofrettaged cracked thick-walled tubes using two dimensional weight function method”, J. Modares Mechanical Engineering, 14(8), Nov. 2014, pp. 137-145. (in Persian)
  44. A. Keshavarz, R. Ghajar, “Modeling of ductile failure based on continuum damage mechanics coupled with anisotropic plasticity”, Aero Space Mechanics Journal, Vol. 9, No. 4 (Winter 2014), 61-74. (in Persian)
  45. R. Ghajar, K. Malekzadeh, M. Gholami, “Dynamic response analysis of doubly curved composite shells subjected to low velocity impact using two models of complete and improved spring-mass”, Aero Space Mechanics Journal, Vol.10, No. 4 ( 2014). (in Persian)
  46. H. Saeidi Googarchin, R. Ghajar, “Stress intensity factors calculation for surface crack in cylinders under longitudinal gradient pressure using general point load weight function”, J. Fatigue & Fracture of Engineering Materials & Structures, 37 (2014) 184-194.
  47. Keshavarz, A., Ghajar, R., Mirone, G., “A new experimental failure model based on triaxiality and lode angle for X100 pipeline steel”, International Journal of Mechanical Science, 60 (2014) 175-182.
  48. R. Ghajar, S.M.R. Khalili, M. Yarmohammad Tooski, “Experimental and numerical investigation on repeated low velocity impact response of aluminum plate using continuum damage mechanics approach”, J. Modares Mechanical Engineering, 14(6), Sep. 2014, pp.52-62. (in Persian)
  49. R. Ghajar, J. Alizadeh K., “Mixed mode two dimensional weight functions for the subsurface elliptical cracks under normal loadings”, J. Modares Mechanical Engineering, 14(10), Jan. 2015, pp. 50-58. (in Persian)
  50. R. Ghajar, A. Rassaf, “Effect of impactor shape and temperature on the behavior of E-glass/epoxy composite laminates”, J. Modares Mechanical Engineering, 14(10), Jan. 2015, pp. 1-8. (in Persian)
  51. R. Ghajar, S. Peyman, A. Shaghaghi Moghaddam, “Computation of dynamic stress intensity factors for three-dimensional cracks in functionally graded materials using interaction integral method”, J. Modares Mechanical Engineering, 14(14), March 2015, pp. 108-116. (in Persian)
  52. J. Alizadeh K., R. Ghajar, “Coupling of the fracture modes for the subsurface elliptical cracks under uniform shear loading”, J. Modares Mechanical Engineering, Accepted. (in Persian)
  53. R. Ghajar, S.M.R. Khalil, M. Yarmohammad Tooski, R. C. Alderliesten, “Investigation of the response of an aluminum plate subjected to repeated low velocity impact using a continuum damage mechanics approach”, J. Fatigue & Fracture of Engineering Materials & Structures, (2014) doi: 10.1111/ffe.12248.
  54. J. Alizadeh K. and R. Ghajar, “Calculation of Mixed Mode Stress Intensity Factors for an Elliptical Subsurface Crack under Arbitrary Normal Loading”, J. Fatigue & Fracture of Engineering Materials & Structures, Decision on Manuscript ID FFEMS-5535.R2, 11-Sep-2014, under Revision.
  55. J. Alizadeh K. and R. Ghajar, “Mixed Mode Weight Functions for an Elliptical Subsurface Crack under Shear Loadings”, J. Engineering Fracture Mechanics, Decision on Manuscript Ms. Ref. No.: EFM-D-14-00245 on 11-Sep-2014, under Revision.

Conference Papers

  1. R. Ghajar, and A. Amirzadeh, "Crack interaction in NDE of parallel multiple cracks by means of DC potential drop technique", 4th Annual (International) Mechanical Engineering Conference-May 1996. (in Persian)
  2. R. Ghajar, R. Basiri, “Investigation of layers on winded pressure vessels”, 5th International Conference on Mechanical Engineering, 1997 Tabriz University (In Persian).
  3. R. Ghajar, and M. Afroogh, "Study of cracks effect on potential drop of middle crack in NDE of more than 3 surface cracks by means of electric current", 6th Annual (International) Mechanical Engineering Conference-May 1998. (in Persian).
  4. R. Ghajar, V. Piroozpanah, A.R. Firoozgan, “Stress analysis of spark motor pistons”, 9th International Conference on Mechanical Engineering, 2001, University of Guilan (In Persian).
  5. R. Ghajar, and A. Hasanpoor, "Buckling of reinforced thin-walled cylinder under axial and lateral loading", 10th Annual (International) Mechanical Engineering Conference-May 2002. (in Persian)
  6. R. Ghajar, and R. Shayesteh, "Determination of effect factor of parallel multiple cracks on potential drop of middle crack in NDE by means of DC electric current", 10th Annual (International) Mechanical Engineering Conference-May 2002. (in Persian).
  7. S M R. Khalili, R. Ghajar, Y. Ghaderi D., “Design and optimization of hybrid composite propeller shaft of RD Pride”, 6th Conference on Manufacture and Production, 2003, Amirkabir University of Technology (In Persian).
  8. R. Ghajar, G.H. Rashed and S. J. Hashemi, "Investigation of vibration behavior of drillpipe", 12th Annual (International) Mechanical Engineering Conference-May 2004. (in Persian)
  9. A. M. Shahani, R., Ghajar and S.A. Tabatabai, "T-Stress effect on initiation fatigue crack", 13th Annual (International) Mechanical Engineering Conference-May 2005. (in Persian)
  10. A. M. Shahani, R. Ghajar and S.A. Tabatabai, "Calculation of stress intensity factors for mixed mode crack in four point bending specimen", 13th Annual (International) Mechanical Engineering Conference-May 2005. (in Persian)
  11. A. M. Shahani, R., Ghajar and S.A. Habibi, "Calculation of stress intensity factors of semi-elliptical crack in thick-walled cylinder under axial loading", 13th Annual (International) Mechanical Engineering Conference-May 2005. (in Persian)
  12. Rashed, G.R., Ghajar, R. and Hashemi, S.J., "A damage mechanics model and its application to the life assessment of a drillpipe", TICME, Iran, 2005.
  13. Rashed R., Ghajar R. and Hashemi S. J. "Evaluation of multiaxial fatigue lives of two different connecting rods using the finite element method", 14th Annual (International) Mechanical Engineering Conference-May 2006.
  14. Rashed G.R., Ghajar R. and Hashemi S. J. "Bending stress for drillpipe subjected to axial loads in a dogleg and its use in drillpipe fatigue analysis", 14th Annual (International) Mechanical Engineering Conference-May 2006.
  15. Rashed G.R., Ghajar R. and Hashemi S. J. "The bending stress magnification influence on drillpipe fatigue", 14th Annual (International) Mechanical Engineering Conference-May 2006.
  16. Rashed, G.R., Ghajar, R. and Hashemi, S.J., Wave propagation in drilling boreholes, ICSV13, Vienna, Austria, 2006.
  17. G.H. Rashed, R. Ghajar, S.J. Hashemi, “Prediction of sand behavior using different plasticity models and comparison with experimental data”, 14th International Conference on Mechanical Engineering, 2006, Isfahan University of Technology (In Persian).
  18. R. Ghajar and M. Behrooz, "Multiaxial fatigue analysis in a high-speed microgenerator rotor shaft", ICMEM, China 2007.
  19. M. Behrooz, R. Ghajar and H. Moztarzadeh, "Critical fatigue damage analysis of high speed microgenerator shaft", MDP-9 Egypt, 2007.
  20. R. Ghajar, H. Biglari, and M. Amini, "Determination of flow curve for aluminum by uni-axial compression test", 2nd Tehran Int. Congress on Manufacturing Engineering, TIMCE 2007, Dec. Tehran, Iran. (In Persian)
  21. R. Ghajar, and A. Jurablou, "Investigation of subsurface cracks growth under repeated contact loading and occurrence of pitting on spur gears flanks", 2nd Tehran Int. Congress on Manufacturing Engineering, TIMCE 2007, Dec. Tehran, Iran. (in Persian)
  22. M. Behrooz, R. Ghajar and S. Tabatabai, "Investigation of geometric parameters and rotation speed on fatigue life of 100 KW high speed microgenerator shaft", 21th Int. Electric Conference, Tehran, Nov. 2007. (In Persian)
  23. R. Ghajar, J. Alizadeh K., N. Naserifar, "Estimation of cyclic strain hardening exponent and cyclic strength coefficient of steels by artificial neural network", ASME International Mechanical Engineering Congress and Exposition, Proceedings 12 , pp. 639-648, 2008.
  24. R. Ghajar, and A. Shakibamanesh, "Simulation of surface cracks growth in lubricated contact surfaces of spur gears", Najafabad Manufacturing Engineering Congress, NMEC 2008, Feb. Najafabad, Iran. (In Persian).
  25. R. Ghajar, H. Khodarahmi, M. Frootan and F. Zahedi, "Simulation of expanding of a spherical cavity in a semi-infinite metal", National Conference of Mechanical Engineering, NCME 2008, Nov., Iran. (In Persian).
  26. H. Khodarahmi, R. Ghajar, and M. Frootan, "Simulation of Indentation of a tungsten long rod in a semi-infinite steel target", National Conference of Mechanical Engineering, NCME 2008, Nov, Iran. (In Persian).
  27. S.M.R. Khalili, R. Ghajar, and M. Sadeghinia, “Impact behavior of cracked plate repaired with composite and FML patches”, Int. Conference on Multifunctional Materials and Structures, 28-31 July, 2008, Hong Kong, China. َ
  28. A. Shaghaghi Moghdam, and R. Ghajar, "A meshless study on linear-elastic crack propagation in functionally graded materials", 17th Annual (International) Conference on Mechanical Engineering-ISME2009 May, 2009, University of Tehran, Iran. (In Persian).
  29. R. Ghajar, H. Khodarahmi, M. Frootan, and M.H.S. Sharbati, "Numerical investigation of Indentation of a rod in a semi-infinite steel target and effect of strength of projectile on the void shape", 17th Annual (International) Conference on Mechanical Engineering-ISME2009 May, 2009, University of Tehran, Iran. (In Persian)
  30. R. Ghajar, J. Alizadeh K. “An infield investigation of the reasons for the vibration experienced in the newly operated passenger coaches by the Iranian railway systems”, ASME International Mechanical Engineering Congress and Exposition, Proceedings 13, pp. 781-787, 2009.
  31. R. Ghajar, H. Saeidi Googarchin, J. Alizadeh K., “Calculation of stress intensity factor history for a subsurface crack in the Iranian railway wheel“, 11th International Railway Transportation Conference, Tehran, Iran, 2009 (In Persian).
  32. M. Hashemi and R. Ghajar, “Empirical comparison of sliding friction and wear behaviors of gray and white cast iron”, ASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis ESDA2010, Istanbul, Turkey, 2010.
  33. H. Tavakkoli, R. Ghajar, J. Alizadeh K., “The influence of tread hollowing of the railway wheels on the hunting of a coach”, ASME International Mechanical Engineering Congress and Exposition, Proceedings 11, pp. 895-900, 2010.
  34. H. Tavakkoli, R. Ghajar, J. Alizadeh K., “21 DOF modeling and dynamic analysis of the Iranian coach equipped by hollow wheels”, 12th International Railway Transportation Conference, Tehran, Iran, 2010, (In Persian).
  35. R. Ghajar, S. Peyman, J. Alizadeh K., “Comparative study of the nonproportional multiaxial fatigue life criteria”, 10th National Aero-space Conference, Tehran, Iran, 2010, (In Persian).
  36. R. Ghajar , H. Saeidi Googarchin, M. Frotan “The effect of impact angle on penetration of rod and telescopic projectiles in stationary and moving steel plates”, 18th International Conference on Mechanical Engineering, 2010, Sharif University of Technology, Tehran. (In Persian).
  37. A. Shaghaghi Moghaddam, R. Ghajar, “Application of gradient elements in ABAQUS to model the 3D functionally graded materials”, 18th International Conference on Mechanical Engineering, 2010, Sharif University of Technology (In Persian).
  38. R. Ghajar, H. Khodarahmi, M. Frootan, “Numerical investigation of ring cavity in compressible elastoplastic materials”, 18th International Conference on Mechanical Engineering, 2010, Sharif University of Technology (In Persian).
  39. R. Ghajar, S. Mehrabian, “Investigation of residual stress in thick-walled cylinders with internal FGM coating” 10th Conference of Iranian Aerospace Society, 2010, Tarbiat Modares University (In Persian).
  40. R. Ghajar, S. Mehrabian, “Thermal analysis of thick-walled cylinders with internal FGM coating” 10th Conference of Iranian Aerospace Society, 2010, Tarbiat Modares University (In Persian).
  41. R. Ghajar, V. Nasir, A. Niknami, D. Hosseini, “Selection of appropriate progressive damage model to predict strength reduction of Graphite specimen using thermal fatigue test” 10th Conference of Iranian Aerospace Society, 2010, Tarbiat Modares University (In Persian).
  42. R. Ghajar, H. Moayeri Kashani, “Aplication of the ALE formulation in the numerical simulation roll forging and flat rolling process”, 3rd International and 12th national Conference on Manufacturing (ICME 2011) 27-29 December.
  43. J. Alizadeh K., H. Tavakkoli, R. Ghajar, “The influence of tread hollowing of the railway wheels on the ride comfort of a coach”, ASME- IMECE 2011 Conference, Denver, Colorado, USA.
  44. J. Alizadeh K., R. Ghajar, H. Javdan, “Analytical and numerical investigations of hunting critical velocity for a passenger bogie”, 13th International Railway Transportation Conference, Tehran, Iran, 2011. (In Persian)
  45. R. Ghajar, K. Malekzadeh, M. Gholami, “Dynamic response analysis of doubly curved composite shells subjected to low velocity impact“, 11th Conference of Iranian Aerospace Society 2011, Tehran, Iran.
  46. R. Ghajar, S. Peyman, J. Alizadeh K., “A new model for predicting of the metals multiaxial fatigue life”, 19th International Conference on Mechanical Engineering, 2011, Birjand University. (In Persian).
  47. R. Ghajar, S. Mehrabian, “Investigation of FGM internal coating of cylinders on the distribution of transient thermal stress” 19th International Conference on Mechanical Engineering, 2011, Birjand University (In Persian).
  48. R. Ghajar, H. Akbari, “Fatigue life estimation of freewheeling gears and over destruction under one-sided loading” 19th International Conference on Mechanical Engineering, 2011, Birjand University (In Persian).
  49. R. Ghajar, V. Nasir, A. Niknami, D. Hosseini, “Comparison of progressive damage models to predict strength reduction of Graphite specimen” 19th International Conference on Mechanical Engineering, 2011, Birjand University (In Persian).
  50. Mirone G., Keshavarz A., Ghajar R., “Effetto di differenti stress paths sulla risposta elastoplastica e la frattura di un acciaio duttile”, Procedere della AIAS 41° Convegno Nazionale, 2012, Padova, Italy. (In Italian)
  51. Keshavarz A., Mirone G., Ghajar R., “Sensitivity analysis and design of experiments for failureanalysis in first quadrant of X-TF plane for X100 pipeline stee”l, Proceeding of X-Mech-2012, 2012, Tehran, Iran.
  52. Mirone G., Keshavarz A., Ghajar R., “An experimental failure model based on triaxiality factor and Lode angle for X-100 pipeline steel”, Proceeding of X-Mech-2012, 2012, Tehran, Iran.
  53. M. Yarmohammad Tooski, R. Ghajar, S.M.R Khalili and R. Alderliestn, "Response of repeated low velocity impact with different impact energy on Glare3", 12th Annual (International) Aerospace Engineering Conference 2012, Amirkabir University, Tehran-Iran. (In Persian).
  54. S.A. Shaker, R. Ghajar, J. Zamani, “Penetration comparison of telescopic and long rod projectiles over metal target in different conditions”, 20th International Conference on Mechanical Engineering, 2012, Shiraz University (In Persian).
  55. R. Ghajar, J. Alizadehi K., “Determination of mode II two dimensional weight function for elliptical subsurface cracks under normal loading”, 13th Conference of Iranian Aerospace Society 2013, Tehran, Iran (in Persian)
  56. M. Yarmohammad Tooski, R. Ghajar and S.M.R Khalili, "Experimental investigation of damage evolution in repeated low velocity impact on Glare structurs", 13th Annual (International) Aerospace Engineering Conference 2013-Tehran University, Tehran-Iran. (In Persian).
  57. H. Saeidi Googarchin, R. Ghajar, Z. Sarvi “Stress intensity factors determination for surface crack in thick walled cylinders under longitudinal gradient pressure ”, 21th International Conference on Mechanical Engineering, 2013, K. N. Toosi University of Technology, Tehran. (In Persian).
  58. R. Ghajar, M.R. Mazloom, “Stress intensity factor calculation of interfacial crack in the bi-material, using closure integral”, 12th Conference of Iranian Aerospace Society, 2013, Amirkabir University of Technology (In Persian).
  59. M.N. Ghoreishi, M. Pourhosseini, R. Ghajar, “Simulation of impact damage in Elastic and viscoelastic materials”, National Conference on applied researches in science and engineering, 2013, Islamic Azad University, Takestan Branch (In Persian).
  60. S.H. Hosseini, M. Shariyat, R. Ghajar, “Numerical elasticity analysis of low velocity impact on a sandwich plate with composite surfaces under 2D pre-load”, 21st International Conference on Mechanical Engineering, 2013, K.N. Tossi University of Technology (In Persian).
  61. S.H. Hosseini, M. Shariyat, R. Ghajar, “3D FE analysis of eccentric low velocity impact on a sandwich plate with composite surfaces”, National Conference on Mechanical Engineering, 2013, Malayer University (In Persian).
  62. M. Yarmohammad Tooski, R. Ghajar, S. M. Khalili, “Experimental analysis of tool drop with repeated impact on glar plate”, Bi-Annual Int. Conf. on Experimental Solid Mech. 18-19 Feb. 2014, Tehran, Iran.
  63. J. Alizadehi K., R. Ghajar, A.R. Shajari, “Determination of two dimensional weight function for elliptical subsurface cracks under normal loading”, 22nd Annual International Conference on Mechanical Engineering-ISME2014 April, University of Shahid Chamran, Iran (in Persian)
  64. R. Ghajar, A.R. Shajari, “Dynamic coupled thermo elasticity analysis of viscoelastic thick-walled cylinder”, 22nd Annual International Conference on Mechanical Engineering-ISME2014 April, University of Shahid Chamran, Iran. (in Persian)

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