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Impact damage assessment in polymer matrix composites using self-heating based vibrothermography

机译：基于自热的振动热成像法评估聚合物基复合材料的冲击损伤

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摘要

Low-velocity impact damage (LVID) is one of the most dangerous damage types appearing in polymeric composite structures during their operation, since they are invisible or barely visible on a surface, while inside a structure they can exist in a form of extended delaminations as well as matrix and interface cracks. According to damage tolerance and condition-based monitoring philosophies applied during maintenance of aircraft structures damage should be detected and identified in a possibly early stage of its development, especially LVIDs. The currently being developed non-destructive testing method, the self-heating based vibrothermography (SHVT), is a promising approach for damage detection and identification in polymeric composite structures, which is based on hysteretic heating of a polymeric matrix used here as a thermal excitation for the method, and is applicable especially in the cases when a direct access to a tested structure is limited or impossible. In this paper, the authors examined the sensitivity of SHVT to LVIDs considering various shapes of impactors and various impact energies. Moreover, the extended study on damage detectability enhancement was performed. The obtained results reveal acceptable detectability of LVIDs using SHVT, while the applied enhancement methods allow for a significant improvement of the damage detectability and quantification.
机译：低速冲击损伤（LVID）是聚合物复合材料结构在操作过程中出现的最危险的损伤类型之一，因为它们在表面上不可见或几乎不可见，而在结构内部，它们可能以扩展分层的形式存在，例如以及矩阵和界面裂纹。根据损害容忍度和在飞机结构维护期间采用的基于状态的监视理念，应该在其发展的早期阶段，尤其是LVID，对其进行检测和识别。目前正在开发的非破坏性测试方法，基于自加热的振动热成像（SHVT），是一种有前途的方法，用于检测和识别聚合物复合结构中的损伤，该方法基于将此处用作热激发的聚合物基质的滞后加热该方法适用于该方法，尤其适用于直接访问受限制的结构受到限制或不可能的情况。在本文中，作者考察了SHVT对LVID的敏感性，考虑了各种形状的冲击器和各种冲击能量。而且，进行了关于损伤检测能力增强的扩展研究。获得的结果表明使用SHVT可以接受的LVID的可检测性，而所应用的增强方法可以使损伤的可检测性和定量得到显着改善。

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