|Analysis of spherical indentation of materials with plastically graded surface layer|
|Yuan FP(袁福平); Jiang P(姜萍); Xie JJ(谢季佳); Wu XL(武晓雷); Yuan, FP; Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China.
|Source Publication||INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
|Abstract||In the present work, a comprehensive parametric study for establishing contact mechanics of instrumented normal spherical indentation on homogeneous materials and materials with plastically graded surface layer (PGSL) was undertaken by dimensional analysis and finite element modeling. The spherical indentation response for homogeneous materials can be described only by two dimensionless parameters: strain hardening exponent and a unified parameter that can describe effects of both the normalized yield strength and the normalized indentation depth. The influences of these two parameters were investigated for a wide range of engineering materials, and the results may be used as an estimate of loading response and pile-up/sink-in behavior when the material properties are known. In the materials with PGSL, a linear gradient in yield strength, and no variation in elastic modulus and strain hardening exponent were explored. The indentation response of the materials with PGSL can be described only by three dimensionless parameters: the normalized indentation depth, the dimensionless strength gradient parameter, and the normalized PGSL thickness. The effects of these three parameters were studied systematically. The normalized pile-up/sink-in parameter is found to be an increasing function of the strength gradient parameter. The normalized pile-up/sink-in parameter increases (decreases) with increasing PGSL thickness for a fixed positive (negative) gradient case at large indentation depth. The results also indicate that the materials with positive PGSL can bear more loads and have significantly more resistance to contact crack formation.|
Plastically Graded Materials
Finite Element Modeling
Mechanical Attrition Treatment
|Funding Organization||The authors would like to acknowledge the financial support of NSFC (Grants Nos. 11002151 and 11072243), 973 Project of China (No. 2010CB631004) and Knowledge Innovation Program of Chinese Academy of Sciences (No. KJCX2-EW-L03).
|Corresponding Author||Yuan, FP; Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China.|
Yuan FP,Jiang P,Xie JJ,et al. Analysis of spherical indentation of materials with plastically graded surface layer[J]. INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,2012,49(3-4):527-536.
袁福平,姜萍,谢季佳,武晓雷,Yuan, FP,&Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China..(2012).Analysis of spherical indentation of materials with plastically graded surface layer.INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES,49(3-4),527-536.
袁福平,et al."Analysis of spherical indentation of materials with plastically graded surface layer".INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 49.3-4(2012):527-536.
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