微观负泊松比(NPR)锚杆具有高应力和高均匀延伸的力学特性,但其本构模型的研究还不够深入.故对此开展了静力荷载作用下微观NPR锚杆的拉伸试验,研究了静力拉伸过程中微观NPR锚杆的应变场演化规律,得到了静力荷载作用下微观NPR锚杆的应力-应变关系曲线.基于试验结果,建立了微观NPR锚杆的本构模型,并将该本构模型嵌入到ABAQUS有限元软件中,开展了静力荷载作用下微观NPR锚杆的数值分析.对比试验结果和数值分析的结果可以看出,两者具有较好的一致性,表明所建立的本构模型能够较好地表现微观NPR锚杆的力学特性.
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.