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An investigation of mechanical behavior and failure mechanisms of composite T-joints with transverse stitching.

机译：横向缝复合T型接头的力学行为和破坏机理研究。

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A new low cost damage tolerant method of joining load-bearing composite structures using two-dimensional dry fabric preforms with transverse stitching and a novel fiber insertion process with resin transfer molding has recently been developed, however, knowledge of strength prediction and failure mechanisms is not well understood. In this investigation, fundamental knowledge of T-joint mechanical behavior was developed through detailed experimental, numerical, and post failure analyses. Experiments were conducted under flexure, tension, and shear loads and failed specimens were examined to discern failure modes. T-joint constituent elastic and strength properties were experimentally determined. Elastic properties were used as input to the finite element analysis and strength properties were used as limiting values in the T-joint failure analysis. Linear elastic, nonlinear elastic, and progressive damage finite element models were developed under each load condition. T-joint numerical models are shown to predict experimental behavior through ultimate load. Damage accumulation was characterized based on experimental, numerical, and post failure analyses. A parametric finite element analysis was conducted and design curves were derived to demonstrate the effect of varying key T-joint interface parameters on mechanical behavior under each load condition. Results of this research enable the application of T-joints with transverse stitching to future products and predictive finite element models developed herein reduce the structural testing required to validate these designs.
机译：最近已经开发了一种新的低成本耐损伤的方法，该方法使用具有横向缝合的二维干布预成型件来连接承重复合结构，并采用树脂传递模塑法来进行新型的纤维插入工艺，但是，有关强度预测和破坏机理的知识尚不多非常明白。在这项调查中，通过详细的实验，数值分析和后期失效分析，开发了T型接头力学行为的基础知识。实验是在弯曲，拉伸和剪切载荷下进行的，检查了失效的样品以识别失效模式。 T型接头的弹性和强度特性是通过实验确定的。弹性特性被用作有限元分析的输入，而强度特性被用作T型接头失效分析的极限值。在每种载荷条件下都建立了线性弹性，非线性弹性和渐进损伤有限元模型。显示了T型接头数值模型，可以通过极限载荷来预测实验行为。基于实验，数值和失效后分析来表征损伤累积。进行了参数化有限元分析，并得出了设计曲线，以证明改变关键的T型接头界面参数对每种载荷条件下的机械性能的影响。这项研究的结果使横向缝制T形接头可以应用于未来产品，并且本文开发的预测性有限元模型减少了验证这些设计所需的结构测试。

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