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An investigation on nonlocal continuum damage models for composite laminated panels

机译：复合材料层合板非局部连续介质损伤模型的研究

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摘要

The performance of nonlocal approaches based on nonlocal strains, damage driving forces and damage variables is investigated for progressive damage analysis of thick/moderately thick laminated panels under uniform transverse loading using eight-noded isoparametric finite element based on a global higher-order shear deformation theory including zig-zag function and first-order theory. The nonlocal variables are obtained from corresponding local variables using layerwise finite element with quadratic through the thickness variation in each layer. The effect of nonlocal parameter on convergence of failure load, maximum deflection and damage variables with successive mesh refinement is investigated. It is concluded that the convergence improvement based on all the three nonlocal models is almost same and the nonlocal scale parameter in the range of 0.5-3% of plate/panel dimensions yields a good convergence rate.
机译：研究了基于非局部应变，损伤驱动力和损伤变量的非局部方法的性能，以基于整体高阶剪切变形理论的八节点等参有限元在均匀横向载荷下对厚/中厚层压板的渐进式损伤分析包括之字形函数和一阶理论。非局部变量是使用分层的有限元从相应的局部变量中获得的，其中每个层的厚度变化均呈二次方。研究了非局部参数对失效载荷，最大挠度和损伤变量的收敛性以及连续网格细化的影响。结论是，基于这三个非局部模型的收敛改进几乎相同，并且非局部比例参数在板/面板尺寸的0.5-3％范围内会产生良好的收敛速度。

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