复合材料T型加筋低速边缘冲击及剩余压缩强度的数值仿真分析

A Progressive Damage Simulation Method for the Low Velocity Edge-impact Damage and Residual Compression Strength of Composite T-Stiffeners

复合材料在航空结构件中大量应用,将T型加筋这类主承力构件复材化是当下的主要趋势。冲击损伤具有较低的可探测性,同时会显著降低结构的剩余压缩强度,对航空结构安全极具威胁。鉴于此,本工作提出了一种渐进损伤仿真流程,用于预测复合材料T型加筋受到冲击后的剩余强度。并通过试验实测数据与仿真模型预测值的对比,验证了本工作所述仿真方法的合理性和有效性。结果表明仿真模型能够定量地给出T型加筋的冲击损伤尺度、压缩破坏应变和剩余压缩强度。同时也能够定性地预测T型加筋在冲击后压缩载荷下的应力应变响应以及损伤位置。

Composite materials have been widely used in aeronautical structures,even for main load-bearing structures,such as T-cross-sectional stiffe-ners.Impact damage,with low detectability could significantly reduce the residual compressive strength of T-stiffeners.In view of this,a progressive damage simulation process was proposed to predict the mechanical responses of T-stiffeners under impact and compression loading cases.By comparing the experimental data with the predicted values of the simulation model,it was shown that the simulation model could quantitatively give the impact crack length,compression failure strain and residual compression strength.Moreover,the stress-strain responses and final failure morphology could also be predicted by the simulation model.Therefore,the rationality and validity of the simulation method were verified.