关键词:Arcan夹具;组合加载;数字图像相关;内聚力接触;边界条件
Abstract: A modified Arcan fixture was used in this paper to study the damage of notched fiber reinforced composites under complex loading.Notched carbon-fiber reinforced compositespecimens([-45/90/45/0]s)were tested under combined tension and shear loading by stretching along 30odirection.The development of cracking in the surface ply of the laminates was measured by the digital image correlation method (DICM), and obvious splitting phenomenais observed at the notch tips. Afterwards a 3D laminate model was developed by finite element software Abaqus. To capture the true stress concentration at the notch tips, cohesivecontactzones were introduced in the model to simulate the splitting in each ply.In order toclarify the effect of rotational degree of freedom at the loading ends on the failure mechanisms and strengths of the laminates, two different boundary conditionswere studied, i.e. constrainingorrelaxingtherotational degree of freedom.The result shows that the direction of resultant force dominate the failure mechanisms and strengths of the laminates. The simulation results withrelaxedrotational degree of freedom arein good agreement with the experiments.
Keywords: Arcanfixture; combinedloading; digital image correlation; cohesivecontact; boundary condition
作者:曹倩妮等,北京理工大学 宇航学院,力学系,北京
通讯作者:刘广彦,北京理工大学 宇航学院,力学系,北京
全文详见知网学术期刊优先数字出版。