应变率及温度对复合材料TP-650力学性能的影响

Effects of Strain Rate and Temperature on Mechanical Properties of TP-650 Composite

摘要:

分别利用MTS-810试验机、杆-杆型冲击拉伸试验机（SHTB）和Instron-1195高温电子拉伸机对复合材料TP-650进行了准静态、动态及高温拉伸试验分析，研究温度和应变率耦合作用对TiC颗粒增强钛基复合材料TP-650力学性能的影响。研究表明，复合材料TP-650的性能优势可保持到高温，650 ℃时仍具有良好的综合力学性能；室温时，复合材料TP-650具有比基体高的强度和低的韧性；应变率低于1000 s-1时，复合材料TP-650呈现正的应变率敏感性。基于试验结果，利用双曲正弦形式修正的Arrhenius关系建立了TP-650的流变力学模型，给出了模型结果，与试验结果相吻合。

Abstract:

Quasi-static, dynamic and high-temperature tension experiments for the composite TP-650 were carried out by MTS-810, bar-bar tensile impact apparatus (SHTB) and Instron-1195 machine, respectively. The coupling effects of temperature and strain rate on the mechanical properties of TiC particle reinforced titanium matrix composite TP-650 were investigated. The results show that the TP-650 composite has excellent mechanical properties at elevated temperatures, even at 650 oC. At room temperature, TP-650 composite has higher strength and lower toughness than the matrix. TP-650 composite shows positive strain rate sensitivity below the strain rate of 1000 s-1. Based on the experiment results, the rheological mechanics model of TP-650 composite was established with Arrhenius equation in the form of hyperbolic sine function, and the model prediction agreed with the experimental results.