Abstract The elongation and impacting experimental system was used to study the dynamic mechanical properties of the constant resistance and large deformation(CRLD) bolts,such as the impacting force,the expansion and elongation of one type of CRLDs. The negative Poisson?s ratio effect was verified and the experimental results were compared with the ones from finite element analysis(FEA). The experimental results showed that the bolt absorbed the impact energy through a process of elastic-plastic structural deformation with the unique negative Poisson?s ratio effect and was well adapted to the dynamic impacting process. The FEA results were matched with the experiment ones,which not only confirmed the accuracy of the FEA method,but also verified the feasibility of using FEA method to prove or substitute the experiment.
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