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组合载荷下含缺口纤维增强树脂基复合材料的失效分析

   日期:2022-11-30     来源:复材网    浏览:280    评论:0    
核心提示: 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30o方向对含缺口碳纤维增强树脂
  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30o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。
 
  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。
 
 
 
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