Mesoscale elastic-plastic constitutive relationship of Fe-32Ni super-invar alloy based on nanoindentation inverse analysis
The nanoindentation technique and electron backscattered diffraction(EBSD)technique were used to test the grains with dif-ferent orientations of Fe-32Ni super-invar alloy to obtain the elastic modulus and hardness of the material in(001),(101)and(111)orientations.An improved inverse algorithm was proposed based on the magnitude analysis.The inverse analysis and calculation of the nanoindentation process of Fe-32Ni super-invar alloy were carried out combined with finite element simulation.The stress and strain rela-tionships of the material in(001),(101)and(111)orientations were finally obtained by comparing the nanoindentation experimental curves with the simulation curves.The results show that the yield strength of the grain in(001)orientation is the highest and the yield strength of the grain in(101)orientation is the lowest.In addition,the stress-strain curves of the grains in(101)and(111)orientations are consistent after yield,while the stress-strain curves of the grains in(001)orientation change gently.The mechanical response of the material in different orientations shows obviously anisotropy.
Fe-32Ni alloynanoindentationfinite element simulationelastic-plasticityinverse analysis
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