摘要
通过三维动力学有限元法,以空间杆单元模拟缝线的增强作用,建立了缝合复合材料层板在横向低速冲击载荷作用下的渐近损伤分析模型.该模型考虑了缝合层板受低速冲击时的纤维断裂、基体开裂及分层等五种典型损伤形式,采用基于应变描述的Hashin失效准则和Yeh分层失效准则,并将其嵌入ABAQUS/Explicit用户子程序以实现相应损伤类型的判断及其材料性能退化.针对相同铺层的缝合与未缝合层板,模拟了低速冲击作用下的冲击响应和渐进损伤过程,数值结果与试验吻合较好,证明了该方法的合理有效性.同时探讨了冲击速度、缝合密度等对缝合层板冲击响应和损伤的影响.
A 3D dynamic finite element model with stitching threads which are described as the spatial truss elements is proposed to predict the progressive damage of stitched laminates. Combined with the userdefined material constitutive program of ABAQUS/Explieit,the typical failure modes, such as fiber break, matrix crushing,matrix cracking and delamination are simulated by employing the strain-based Hashin and Yeh failure criterion The dynamic response and damage propagation of stitched/unstitched laminates were simulated with this method. The numerical results well agree with the measured results and thus verify the effectiveness of the model. The effects of the impact velocity, the component material systems and the main stitching parameters on the dynamic response and damage evolution of stitched composites were discussed in detail, and some valuable conclusions are drawn herein
出处
《固体力学学报》
CAS
CSCD
北大核心
2011年第1期43-56,共14页
Chinese Journal of Solid Mechanics
关键词
缝合复合材料层板
低速冲击
动态响应
失效模式
渐近损伤
有限元法
stitched composite laminates, low velocity impact, dynamic response, failure modes, progressive damage, FEM
