表征平纹编织碳纤维复合材料特性的两种连续损伤模型  

Two continuum damage mechanic models for characterization of plain woven carbon fiber composites

作　　者：刘增 魏新奇 夏勇[1] LIU Zeng;WEI Xinqi;XIA Yong(School of Vehicle and Mobility,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学车辆与运载学院

出　　处：《汽车安全与节能学报》2019年第3期293-299,共7页Journal of Automotive Safety and Energy

基　　金：科技部重点专项课题(2016YFB0101606)

摘　　要：为表征平纹编织碳纤维复合材料的力学特性,对比了商业软件Ls-Dyna中两种连续损伤力学内置材料模型Mat58和Mat261。用准静态偏角度拉伸及穿孔实验与有限元(FE)仿真相结合的方法,分析比较了这两种模型的特点。结果表明:由于Mat261允许面内剪切应力应变曲线的直接输入,其偏角度拉伸的仿真结果明显优于Mat58的仿真结果。Mat261相较于Mat58具有非常复杂的失效准则,对于具有复杂失效应力状态的穿孔仿真,Mat261的表现得更为优异。使用Mat261进行了波纹板压溃的仿真,实验与仿真的比吸能相差4.2%,验证了该模型的优势。After discussed two continuum mechanic models–Mat58 and Mat261 in Ls-Dyna for mechanical characterization of plain woven composites,the characteristics of these two material models were compared and analyzed by incorporating both experiment and finite element(FE)simulation of off-angle tension and punch test.The results show that better performance can be expected from Mat261 than that from Mat58 in simulation of off-angle tension since direct input of shear stress versus strain curve is allowed in Mat261.Due to the possession of complex failure criterions for Mat261 compared with Mat58,higher of accuracy can be reached for simulation with Mat261 of punch which presents complex stress failure states.Simulation of axial crushing of corrugated plate with Mat261 is conducted and satisfactory results,with a difference of 4.2%for specific energy absorption between the simulation and the experiment.Therefore,this verifies the advantage and feasibility of model Mat261.

关 键 词：汽车轻量化 碳纤维复合材料 连续损伤模型 有限元 力学表征 本构行为 

分 类 号：O341[理学—固体力学]