Influence of sample thickness on the correlation between force of small punch test and material strength
In order to study the effect of sample thickness on the correlation between the force of small punch test and material strength,finite element simulation was conducted using virtual materials without yield platform for small punch samples with different thicknesses(0.1~0.5 mm).By extracting and analyzing the force of small punch test at fixed deflection in the finite element simulation results,the bilinear relationship between the force of small punch test and material yield strength and tensile strength was proved,and the change in thickness would not affect the Pearson correlation coefficient of the correlation.100 virtual materials with yield ratio between 0.55 and 0.9,and yield strength between 200 MPa and 1 000 MPa were randomly generated,and a lot of date was obtained by finite element simulation,then the correlation coefficient between the small punch test force and material strength at fixed defection was obtained by annealing particle swarm algorithm.Finally,the bilinear correlation between the small punch test force and material strength was verified by using four actual materials.
small punch testmaterial strengthbilinear modelfinite element method