Abstract
This paper presents an extracting method of creep exponent and coefficient in Norton’s law from an indentation creep test analytically, assisted by a finite element analysis. Previous studies extracted only the creep exponent empirically with no theoretical verification. No extracting method on the creep coefficient has been proposed from an indentation creep test. By analyzing multiaxial stress states under a ball indenter in combination of a creep constitutive equation, an analytical method to derive the creep coefficient is developed. The method is verified to have a satisfactorily accuracy to determine the two material constants in Norton’s law by finite element analyses and in experiments.
Highlights
This paper proposes an extracting method of creep exponent and coefficient in Norton’s law from an indentation creep test
The objective of this paper is to develop a new method of extracting creep exponent and coefficient from an indentation creep test
Considering that the creep exponents and creep coefficients extracted from the indentation tests agree with those in uniaxial creep tests by finite element method (FEM) and in experiments, the extracting method developed in this study conveys a satisfactory reliability for a practical use
Summary
This paper proposes an extracting method of creep exponent and coefficient in Norton’s law from an indentation creep test. A recent topic of indentation studies is to extract material constants from hardness testing, like Young’s modulus, strain hardening exponent and coefficient etc. Among these studies, hardness studies to extract creep exponent and coefficient have attracted interests of researchers and many studies challenge this topic. The creep exponents and coefficients obtained by the proposed indentation test method are compared with those in uniaxial creep tests for a Sn-37Pb eutectic solder
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