摘要
基于层间增韧复合材料层合板的低速冲击实验,在ABAQUS分析环境下建立了一套量化考查低速冲击载荷作用下层间增韧对复合材料层合板力学行为影响的有限元分析模型。模型中采用自行开发的VUMAT子程序定义复合材料层内单元材料本构关系,预测典型的层内失效模式,包括纤维拉伸失效、纤维压缩失效、基体开裂失效和基体挤裂失效,并对失效单元进行相应的刚度折减。模型中在复合材料层合板相邻两铺层间定义了一层层间界面单元,层间分层起始损伤是采用二次名义应力判据来预测的,层间分层扩展采用的是混合模式的能量准则来判断的。有限元预测结果和实验结果的比较验证了分析方法和分析模型的准确性和有效性。
Based upon the data and observation from the low velocity impact experiment on interlayertoughened composite laminates,a finite element model（FEM） is developed to quantificationally study the mechanical behavior of interlayer-toughened laminates subject to low velocity impact using ABAQUS.In this model,a VUMAT subroutine is used to define the constitutive relationships and to predict the stress-based failure criteria of a composite lamina.Typical failure modes,including fiber tensile failure,fiber compress failure,matrix crushing and matrix cracking,are considered in the subroutine.The stiffness reduction of failed elements is also included.Cohesive elements are introduced into the model in the region between two neighboring layers in the laminate.A quadratic nominal stress criterion and a power law fracture criterion are adopted to predict the initiation and evolution of delamination.The FEM prediction results show a good agreement with experimental data,which validates FEM developed in this study.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2013年第5期686-692,共7页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
复合材料
层合板
层间增韧
低速冲击
有限元分析
composite
laminate
interlayer-toughened
low velocity impact
finite element analysis
