内埋元件复合材料层合板分层损伤的试验及数值研究  

AN EXPERIMENTAL AND NUMERICAL INVESTIGATION ON THE DELAMINATION IN COMPOSITE LAMINATES WITH EMBEDDED DEVICES

作　　者：乔文静[1] 肖毅[1] 福田博 八田博志 薛元德[1] 

机构地区：[1]同济大学航空航天与力学学院,上海200092 [2]东京理科大学,野田278-8510 [3]日本宇宙航空研究开发机构JAXA,相模原252-5210

出　　处：《玻璃钢／复合材料》2014年第6期4-11,共8页Fiber Reinforced Plastics/Composites

摘　　要：功能器件集成于结构材料内是实现多功能结构一体化设计的一个重要途径。然而集成后往往导致结构系统中产生几何不连续界面,成为失效的起点,是降低原有结构性能和破坏结构完整性的主要原因。本文通过试验观察及数值分析探讨了内埋元件对其复合材料结构完整性影响的一些关键因素。拉伸试验中采用声发射技术并结合不同载荷阶段下的内部损伤观察,确立了损伤演化与拉伸性能退化的关系。结果表明,埋置件与复合材料间的分层损伤是导致结构拉伸性能退化的主要机制,分层扩展阻力取决于与埋置件相邻层的纤维取向角度。数值分析中利用有限元软件ABAQUS建立了二维平面应变有限元模型,分析了埋置件附近的应力分布,并基于断裂力学理论分析了分层损伤扩展行为。数值结果表明,引入不同临界能量释放率值,可以很好地模拟"裸界面"与"摩擦界面"对裂纹扩展速率的不同效应。Functional devices integrated within the structural materials are a key way to implement and design the multifunctional materials and structures. However,the embedded device in a composite structure would generally cause a geometric discontinuity that result in a significant effect on the structural integrity. Some of the key issues in affecting the structural integrity have been explored experimentally and numerically in this paper. During static tensile testing,the damage evolution was monitored by acoustic emission measurement,and several specimens were observed through optical micrograph at different load levels to determine the progressive damage development. Testing results show that delamination at the interface between composite and integrated device is a significant damage mechanism in tensile performance degradation,and the delamination propagation depends on the ply angle of SUS /θ interface. A two-dimensional plane strain finite element model using ABAQUS code was developed to study damage initiation using stress analysis and the behavior for delamination propagation using a fracture mechanics approach. Numerical results show that the different effects of ＂ slipping＂ and ＂ frictional＂ on crack propagation can be modeled by introducing different critical release rate.

关 键 词：多功能结构 结构完整性 分层损伤 有限元分析 断裂力学 

分 类 号：TB332[一般工业技术—材料科学与工程]