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首页> 外文期刊>Composite Structures >Multiaxial loading on a 3D woven carbon fiber reinforced plastic composite using tensile-torsion tests : Identification of the first damage envelope and associated damage mechanisms
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Multiaxial loading on a 3D woven carbon fiber reinforced plastic composite using tensile-torsion tests : Identification of the first damage envelope and associated damage mechanisms

机译：使用拉伸-扭转试验在3D编织碳纤维增强塑料复合材料上施加多轴载荷：识别第一个损伤包络和相关的损伤机理

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摘要

This study focuses on the experimental identification of the first damage envelope in a 3D woven composite with polymer matrix, under mull-axial loadings including combined in-plane tension and out-of-plane shear loadings (sigma-tau envelopes). Proportional Tensile-Torsion tests on rectangular bars were performed to induce different multiaxial stress states. To enable envelopes identification, onset of the first damage has been evaluated thanks to the correlation of various and complementary investigation measurement techniques, such as Stereo-Digital Image Correlation (Stereo-DIC), Acoustic Emission (AE) and in-situ microscopic observations. In addition, a specific data reduction process has been used to manage accurate quantification of the stress state induced by the multiaxial loadings. Based on these findings, both sigma(11)-tau(13) and sigma(22) -tau(23) envelopes were identified on a 3D woven composite material with polymer matrix. Using microscopic observations, damage mechanisms (type and localization) related to the mull-axial loadings were identified. In addition, thanks to the strain fields measured by the Stereo-DIC on the material surface, particular relations between the mull-axial loadings and the 3D woven architecture have been established.
机译：这项研究的重点是在考虑了轴向载荷（包括面内张力和面外剪切载荷（sigma-tau包膜））的竖向载荷下，对具有聚合物基体的3D编织复合材料中的第一个损伤包膜进行实验鉴定。在矩形钢筋上进行了比例拉伸－扭转试验，以诱发不同的多轴应力状态。为了能够识别信封，已经通过各种立体测量技术（例如立体声数字图像关联（Stereo-DIC），声发射（AE）和原位显微镜观察）的相关性对首次损坏的发生进行了评估。另外，特定的数据缩减过程已用于管理由多轴载荷引起的应力状态的准确量化。基于这些发现，在具有聚合物基体的3D编织复合材料上确定了sigma（11）-tau（13）和sigma（22）-tau（23）包络。使用显微镜观察，确定了与竖向轴向载荷有关的损伤机理（类型和位置）。此外，得益于Stereo-DIC在材料表面上测得的应变场，已经建立了竖向荷载与3D编织结构之间的特殊关系。

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