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Geometrically nonlinear extended isogeometric analysis for cohesive fracture with applications to delamination in composites

机译:基于复合材料中分层的粘性骨折的几何非线性延长异步分析

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摘要

We propose a geometrically nonlinear extended isogeometric analysis approach for cohesive fracture. A shifting technique is used to enforce compatibility in the direction perpendicular to the crack path, while a blending technique has been adopted to remove the effect of the discontinuity in the extension of the cohesive crack. Bezier extraction is employed to cast the formulation in a finite element datastructure. The use of a sign function instead of a Heaviside step function removes the need to make an assumption for the normal to the crack at its centreline. Examples are given to illustrate the methodology, including buckling of a delaminated structure and an assessment of the interface contribution to the tangent stiffness matrix.
机译:我们提出了一种几何非线性延伸的异诊测方法,用于粘性骨折。 换档技术用于在垂直于裂纹路径的方向上实施相容性,而已经采用混合技术去除不连续在粘性裂纹的延伸中的效果。 使用Bezier提取在有限元数据结构中施放制剂。 使用符号功能而不是沉重的步骤功能去除需要对其中心线进行正常裂缝的假设。 给出了实施例来说明方法,包括分层结构的屈曲和对切线刚度矩阵的界面贡献的评估。

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