Constitutive Model of Micro Negative Poisson's Ratio Anchor Bolts under Static Loading
Micro negative poisson's rotio(NPR)anchor bolts have mechanical properties of high stress and high uniform extension,however,the study of its constitutive modelling has not been particularly in-depth.Therefore,the tensile test of micro NPR anchor bolts under static loading was carried out,the strain field evolution law of micro NPR anchor bolts during static tensile was investigated,and the stress-strain relationship curve of micro NPR anchor bolts was obtained.Based on the experimental results,the constitutive model of the micro NPR anchor bolts was established,and the constitutive model was embedded into the ABAQUS finite element software,the numerical analyses of micro NPR anchor bolts under static loading were carried out.Comparison of the experimental results and the results of numerical analyses shows that they are in good agreement,indicating that the established constitutive model can better represent the mechanical properties of micro NPR anchor bolts.
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