反复低速冲击下短纤维复合材料的能量耗散与损伤演变  

Energy Consumption and Damage Evolution of Short-Fibre Composites under Repeated Low Velocity Impact

作　　者：史建平[1] 林吉忠[1] 

机构地区：[1]中国铁道科学研究院金属及化学研究所,北京100081

出　　处：《材料科学与工程学报》2007年第1期61-66,87,共7页Journal of Materials Science and Engineering

基　　金：国家自然科学基金(50072019);国家杰出青年基金(50225210)资助项目

摘　　要：运用热力学理论和最小耗能原理,研究了反复低速冲击下短纤维复合材料的能量耗散与损伤演变,给出了冲击循环下材料耗散能表达式,建立了与复合材料割线模量降低率相关的损伤变量表达式和损伤演变方程。同时,以试验数据为基础,利用导出的损伤变量表达式,绘制出了反复低速冲击下短纤维复合材料的损伤演变曲线,并对曲线趋势进行了分析。The thermodynamics theory and the principle of least energy consumption were applied to studying the energy consumption and damage evolution of short-fibre composites under repeated low velocity impact. The dissipation energy formula of materials under repeated impact was deduced. The damage variable formula and the damage evolutionary equation depending on the secant-module declining ratio of composites were built up. And then, on basis of the experimental data, by means of the damage variable formula, damage evolutionary curves of short-fibre composites under repeated low velocity impact were drawn and the curves＇ trend was analysed.

关 键 词：热力学理论 最小耗能原理 反复低速冲击 短纤维复合材料 能量耗散 损伤演变 

分 类 号：TB323.01[一般工业技术—材料科学与工程] O346.5[理学—固体力学]