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Patch Aspect Ratio and Load Attraction in Bonded Composite Repairs of Composite Structures

机译:复合结构粘结复合修理中的贴片纵横比和负载吸引

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This paper presents a recently developed analytical model for assessing the load attractions on bonded composite repairs of composite structures. Basic formulation of the analytical model considers the bonded composite repairs of a laminated anisotropic elastic thin plate. The repair patch was also assumed to be laminated anisotropic elastic. Load attractions around the elliptical boundary of a repair patch were computed, when the repaired plate was under a combined loading of in-plane shearing and stretching, and out of plane bending. The repair patch was modeled as an inhomogeneity of the plate within the content of the Kirchhoff theory. This problem of two-dimensional deformations of anisotropic elastic materials was reduced to the problem of finding complex eigenvalues and their corresponding eigenvectors from an eigenrelation, which is a function of the elastic stiffness. The model is capable of simulating an extremely soft patch, e.g. with modulus being 10~(-6) of the laminate, therefore, the model can be used for damage assessment to determine if repairs are indeed required. Comparisons with known classic solutions for the problems of laminate plates with open holes are presented. Effects of the patch stiffness on the load attractions are studied for various repair configurations, including a repair with a rigid patch, to demonstrate the versatility of the analytical model. In addition, effect of the aspect ratio of the elliptical patch was investigated by studying cases with various aspect ratios, i.e., the elliptical patch is skewed from one direction to the other. As the aspect ratio of an elliptical open hole deviates significantly from the value of 1 for a circle hole, the solution exhibits some near singular behavior found in the crack problem. The load attractions are computed for every point around the boundary of the patch.
机译:本文介绍了最近开发的分析模型,用于评估复合结构粘合复合材料修复上的负载景点。分析模型的基本配方考虑了层压各向异性弹性薄板的粘合复合材料。还假设修复贴片是层压各向异性弹性的。计算修复贴片的椭圆图周围的负载景点,当修复的板在面内剪切和拉伸的组合负载下,并超出平面弯曲时。修复贴片被建模为柯克霍夫理论的内容内板的不均匀性。各向异性弹性材料的二维变形问题被降低到从特征范围内发现复杂的特征值和它们对应的特征向量的问题,这是弹性刚度的函数。该模型能够模拟一个极其软的贴片,例如,由于模量为10〜(6)的层压板,因此该模型可用于损坏评估,以确定是否需要维修。提出了具有已知经典解的比较,用于具有开孔的层压板问题。针对各种修复配置研究了贴片刚度对负荷景点的影响,包括用刚性贴片的修复,以证明分析模型的多功能性。另外,通过研究具有各种纵横比的病例,即,椭圆形贴片,即椭圆形贴片对另一个方向偏斜的效果。随着椭圆形孔的纵横比从1的圆孔的值显着偏离,溶液在裂纹问题中表现出一些近乎奇异的行为。为贴片边界周围的每个点计算负载景点。

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