欢迎登录材料期刊网

材料期刊网

高级检索

采用球形压头的数值模拟表明,当应变硬化指数n大于0.23时,不论屈服应变σy/E为何值,在压入过程中所有材料的压痕周围均出现凹陷;当n小于0.23时,随着σy/E的增大,材料由凸起向凹陷转变;当σy/E大于0.02时,不论n为何值材料也都出现凹陷;当σ y/E小于0.02时,材料出现凸起向凹陷的转变,当比值残余压痕深度/最大压入深度(hf/hmax)小于0.76时,材料出现凹陷,n值越大凹陷越严重;当hf,/hmax>0.76,若n<0.23材料出现由凸起向凹陷转变,若n>0.23材料均发生凹陷,还得到了反映凸起凹陷的表观参量C2与接触面积Am之间的函数关系,分析了C2对压痕硬度误差的影响规律.

参考文献

[1] X.Hernot,O.Bartier,Y.Bekouche,EI.R.Abdi,Influence of penetration depth and mechanical properties on contact radius determination for spherical indentation,International Journal of Solids and Structures,43,4136(2006)
[2] G.Das,S.Ghosh,S.C.Bose,S.Ghosh,Use of ball indentation technique to evaluate room temperature mechanical properties of a gas turbine blade,Materials Science and Engineering,424(A),330(2006)
[3] M.Dao,N.Chollacoop,K.J.Van Vliet,T.A.Venkatesh,S.Suresh,Computational modeling of the forward and reverse problems in instrumented sharp indentation,Acta Mater.,49,3899(2001)
[4] Y.P.Cao,J.Lu,A new method to extract the plastic properties of metal materials from an instrumented spherical indentation loading curve,Acta Materialia,52,4023(2004)
[5] D.Tabor,The Hardness of Metals (Oxford,University Press,1951) p.14
[6] Y.T.Cheng,C.M.Cheng,What is indentation hardness,Surface and Coatings Technology,133-134,417(2000)
[7] A.Bolshakov,G.M.Pharr,Influences of pile-up on the measurement of mechanical properties by load and depth sensing indentation techniques,J.Mater.Res.,13,1049(1998)
[8] Y.T.Cheng,C.M.Cheng,Scaling approach to conial indentation in elastic-plastic solids with work hardening,J Appl.Phys.,84,1284(1998)
[9] W.C.Oliver,G.M.Pharr,An Improved technique for determining hardness and elastic modulus using load and displacement indentation experiments,J.Mater.Res.,7(6)1564(1992)
[10] H.L.Lee,J.H.Lee,G.M.Pharr,A numerical approach to spherical indentation techniques for material property evaluation,Journal of the Mechanics and Physics of Solids,53,2046(2005)
[11] N.W.Chollacoop,Computational and experimental study of instrumented indentation,PhD Thesis,Massachusetts Institute of Technology (2004)
[12] J.Alcala,A.C.Barone,M.Anglada,The influence of plastic hardening on surface deformation modes around Vickers and spherical indents,Acta Mater.,48,3451(2000)
上一张 下一张
上一张 下一张
计量
  • 下载量()
  • 访问量()
文章评分
  • 您的评分:
  • 1
    0%
  • 2
    0%
  • 3
    0%
  • 4
    0%
  • 5
    0%