组合载荷下含缺口纤维增强树脂基复合材料的失效分析  

Failure analysis of notched fiber reinforced polymer composites under combined loading

作　　者：曹倩妮 刘广彦 黄广炎[2] CAO Qianni;LIU Guangyan;HUANG Guangyan(Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081, China; State Key Laboratory of Explosion Science and Technology, School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]北京理工大学宇航学院力学系,北京100081 [2]北京理工大学机电学院爆炸科学与技术国家重点实验室,北京100081

出　　处：《复合材料学报》2018年第10期2723-2729,共7页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(11242015)

摘　　要：为研究含缺口纤维增强复合材料层合板在复杂载荷下的破坏,本文采用改进的Arcan夹具,在30°方向对含缺口碳纤维增强树脂基复合材料层合板([-45/90/45/0]s)进行了拉伸-剪切组合加载实验。用数字图像相关方法(DICM)测量了层合板表面层的裂纹发展过程,在缺口尖端观察到了明显的劈裂现象。然后用有限元软件ABAQUS建立了三维层合板模型,为准确模拟裂纹尖端的应力场,模型中每层引入内聚力接触来模拟劈裂。为了比较加载端的转动自由度对层合板失效模式和破坏强度的影响,文中分析了两种不同的边界条件,即约束和放松加载端的转动自由度。研究结果发现,加载端的合力方向主导了层合板的失效模式和破坏强度,放松加载端自由度的模拟结果与实验结果有很好的一致性。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 composite specimens（[-45/90/45/0]s）were tested under combined tension and shear loading by stretching along 30°direction.The development of cracking in the surface ply of the laminates was measured by the digital image correlation method（DICM）,and obvious splitting phenomena is observed at the notch tips.Afterwards a 3 Dlaminate model was developed by finite element software ABAQUS.To capture the true stress concentration at the notch tips,cohesive contact zones were introduced in the model to simulate the splitting in each ply.In order to clarify the effect of rotational degree of freedom at the loading ends on the failure mechanisms and strengths of the laminates,two different boundary conditions were studied,i.e.constraining or relaxing the rotational degree of freedom.The result shows that the direction of resultant force dominates the failure mechanisms and strengths of the laminates.The simulation results with relaxed rotational degree of freedom are in good agreement with the experiments.

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 

分 类 号：TB330.1[一般工业技术—材料科学与工程]