高温环境下T300/BMP350拉伸力学行为研究

Study of T300/BMP350 Composite Tensile Mechanical Behavior at Elevated Temperature

对不同温度下的耐高温树脂基复合材料T300/BMP350的0°和90°单向层合板进行静载拉伸实验,得到材料在不同温度下的应力-应变响应,分析了温度对材料的力学性能影响。通过高温应变片采集到材料在高温环境下的热输出和破坏时的极限应变,分析了材料的热行为。通过分析材料的应力-应变曲线和失效模式,研究了材料的损伤和失效机理。研究结果表明:T300/BMP350树脂基复合材料具有很好的耐高温性能。高温下0°方向的拉伸强度和模量保持率达到80%以上,90°方向的拉伸强度和模量保持率可以达到50%以上。高温环境对材料的极限应变影响不大,材料破坏模式均为脆性破坏。基于实验结果,对材料的强度随温度的变化进行拟合,预测了该材料在350℃时0°和90°的拉伸强度。

Static tensile experiment for thermostable polyimide resin matrix composite T300/BMP350 unidirectional laminates along respective 0° and 90° direction was carried out at different elevated temperatures.Stress-strain response at different temperatures of the material was obtained.The effect of temperature on mechanical properties of the materials was systematically analyzed.The material ultimate strain of destruction and heat output in high temperature environment were collected by using high temperature strain gauges,based on which,thermal behavior of the material was analyzed in detail.Damage and failure mechanisms of the material were studied by analyzing the material stress-strain curve and failure mode.Results show that T300/BMP350 polyimide resin matrix composite has very excellent thermostable performance.The conservation rates of tensile strength and modulus of material along 0° and 90° direction during tensile loading reach 80% and 50%,respectively.High temperature has little effect on ultimate strain of material,and material failure mode is brittle.Basted on experimental results,tensile strength of material along respective 0°and 90°directions at 350℃ was predicted through the fitting of strength variation with temperature.