Review of Research on Extraordinary Mechanical Properties and Engineering Seismic Toughness of NPR Materials

Abstract

Negative Poisson 's ratio ( NPR ) material has the unique mechanical properties of lateral expansion during tension, and has high toughness, high strength, large deformation capacity under constant resistance and excellent energy absorption performance, which provides a new way to improve the seismic performance of engineering structures. This paper systematically summarizes the research and application progress of such materials ( such as NPR anchors / cables, NPR steel bars ) in seismic engineering. The key mechanical behaviors ( negative Poisson 's ratio effect, constant resistance energy absorption, high shear strength ) are summarized, as well as the core role in geotechnical support, structural reinforcement and isolation barrier. Through static / dynamic tensile, cyclic shear and shaking table model tests, combined with numerical simulation methods such as ABAQUS and LS-DYNA, it is confirmed that NPR materials have significant effects in efficiently dissipating seismic energy, coordinating large deformation, reducing surrounding rock damage and reducing structural dynamic response. Although some achievements have been made in engineering practice, the performance degradation of this material at high temperature, the decrease of constant resistance under cyclic loading and the high preparation cost are still the main bottlenecks in the development of this field. In the future, these obstacles need to be broken through in this technology to promote the wide engineering application of NPR materials in earthquake resistance and disaster prevention of major projects.