This paper aims to investigate the ability of ultrasonic and electronic speckle pattern interferometry to analyse the low-velocity impact internal damage mechanisms on basalt composite laminates and to provide information on the shape and the extent of the delamination in non-destructive way. Basalt/epoxy composites with different thicknesses have been realised and characterised by mechanical tests to investigate both fibre-dominated (tensile and flexural behaviour) and matrix-dominated properties (interlaminar shear strength). Specimens were impacted at penetration and at increasing energy values, to explore the damage onset and propagation. The results showed that the damage was concentrated under the impactor–material contact point and that the composite with intermediate thickness had the best balance between the different kinds of impact damages: delamination and indentation. Further, a good agreement was found between the overall data obtained by the two non-destructive techniques, confirming the capability of both techniques to examine the composite impact damage.

中文翻译：

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检测和表征复合材料层压板冲击损伤的不同无损技术方法的比较

本文旨在研究超声和电子散斑干涉测量法分析玄武岩复合材料层合板的低速冲击内部损伤机制的能力，并以非破坏性方式提供有关分层形状和程度的信息。已经实现了具有不同厚度的玄武岩/环氧树脂复合材料，并通过机械测试对其进行了表征，以研究纤维主导（拉伸和弯曲行为）和基体主导的特性（层间剪切强度）。样本在穿透和增加能量值时受到影响，以探索损伤的发生和传播。结果表明，损伤集中在冲击器-材料接触点下方，中间厚度的复合材料在不同类型的冲击损伤之间具有最佳平衡：分层和压痕。此外，通过两种非破坏性技术获得的整体数据之间存在良好的一致性，证实了两种技术检查复合材料冲击损伤的能力。