EXPERIMENTAL STUDIES OF DYNAMIC BEHAVIOR OF TINI ALLOY THIN CIRCULAR PLATE SUBJECTED TO TRANSVERSAL IMPACT

Authors

  • ST CUI UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
  • BO WANG UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
  • ZHANG KE UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA

Keywords:

SHOCK-INDUCED PHASE TRANSITION, SHAPE MEMORY ALLOY, TRANSFORMATION HINGE, FLEXIBLE WAVE

Abstract

THE EXPERIMENTAL RESEARCH OF THIN CIRCULAR PLATE OF PSEUDO-ELASTIC TINI ALLOY UNDER FIXED SUPPORTS AND TRANSVERSAL IMPACT LOADING WAS CONDUCTED THROUGH USING THE MODIFIED APPARATUS OF SPLIT HOPKINSON PRESSURE BAR. THE EXPERIMENT RESULTS OF PSEUDO-ELASTIC TINI ALLOY WAS COMPARED WITH THAT OF A3 STEEL. THE NATURE OF DYNAMIC MECHANICAL RESPONSE OF THE STRUCTURE IN SPATIO-TEMPORAL SCALE, INCLUDING THE PROPAGATION OF FLEXIBLE WAVE IN THE PLATE, EVOLUTION OF TRANSFORMATION ZONES AND FULL-FIELD OUT OF PLANE DISPLACEMENT WERE DERIVED. THE RESULTS SHOW THAT TRANSFORMATION ZONES AND TRANSFORMATION HINGE MAY GENERATE NEAR THE CENTER OF THE PLATE (ABOUT 5MM) BECAUSE OF TWO-DIMENSIONAL DIFFUSION EFFECT OF THE CIRCULAR PLATE UNDER IMPACT LOADING. THE TRANSFORMATION HINGE DISAPPEARS AFTER UNLOADING; HOWEVER, THE A3 STEEL PLATE HAS RESIDUAL DEFORMATION OBVIOUSLY. THE IMPACT RESPONSE OF TINI ALLOY THIN CIRCULAR PLATE IS DOMINATED BY THE THERMO-ELASTIC MARTENSITE PHASE TRANSFORMATION AND INVERSE TRANSFORMATION, WHICH DIFFERS FROM THE CONVENTIONAL ELASTIC-PLASTIC TRANSFORMATION MECHANISM.

Published

2016-08-26

Issue

Section

Articles