scholarly journals Simultaneous determination of the strain hardening exponent, the shear modulus and the elastic stress limit in an inverse problem

2016 ◽  
Vol 40 (15-16) ◽  
pp. 6956-6968
Author(s):  
Salih Tatar ◽  
Ramazan Tınaztepe ◽  
Zahir Muradoğlu
Keyword(s):  
Inverse Problem ◽  
Shear Modulus ◽  
Strain Hardening ◽  
Simultaneous Determination ◽  
Elastic Stress ◽  
Strain Hardening Exponent ◽  
Stress Limit

Determination of the maximum strain–hardening exponent

2012 ◽  
Vol 550 ◽  
pp. 80-86 ◽  
Author(s):  
Tianhan Xu ◽  
Yaorong Feng ◽  
Zhihao Jin ◽  
Shengyin Song ◽  
Danghui Wang
Keyword(s):  
Strain Hardening ◽  
Strain Hardening Exponent ◽  
Maximum Strain

Extracting yield strength and strain-hardening exponent of metals with a double-angle indenter

2009 ◽  
Vol 24 (5) ◽  
pp. 1674-1682 ◽  
Author(s):  
Genliang Hou ◽  
Fei Wang ◽  
Kewei Xu
Keyword(s):  
Elastic Modulus ◽  
Yield Strength ◽  
Strain Hardening ◽  
Small Region ◽  
Constitutive Relationship ◽  
Strain Hardening Exponent ◽  
Yield Strain ◽  
Isotropic Metal ◽  
Wear And Corrosion Resistance

A double-angle indenter model is proposed to determine the representative strain in the indentation process, and a new method is then developed aiming at the extraction of the yield strength and strain-hardening exponent from the surface layer of metals, because surface properties, especially in a small region, may differ from bulk ones and are sometimes closer to service properties such as fatigue strength, wear, and corrosion resistance. First, the isotropic metal was analyzed, the elastic modulus of which was fixed at 128 GPa, the yield strength was 50 to 200 MPa, and the strain-hardening exponent was 0.1 to 0.5. By introducing the yield strain to substitute the yield strength in the calculation, it was proved that the model can cover the majority of metals because the introduced weight parameter λ is independent of the yield strength and the elastic modulus, although it depends on the strain-hardening exponent to some extent. For the determination of yield strain εY (or yield strength Y), the precision is better for low C/E and low n, whereas for the determination of strain-hardening exponent n, the precision is better for high C/E and low εY. By using the double-angle indenter, the material constitutive relationship at the surface can be evaluated from just one indentation without any other measurements.

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