Wang Xinyan, He Jingjing, Guo Wenhao, Guan Xuefei
Graduate School of China Academy of Engineering Physics, 10 Xibeiwang E. Rd., Beijing 100193, China.
School of Reliability and Systems Engineering, Beihang University, 37 Xueyuan Rd., Beijing 100191, China.
Ultrasonics. 2021 Feb;110:106264. doi: 10.1016/j.ultras.2020.106264. Epub 2020 Sep 28.
The evaluation of internal damage in multilayered composite materials is of great importance for high reliability-demanding applications, and remains a challenge due to the complex failure modes and mechanism of composite materials. This study presents a volumetric method of three-dimensional size quantification and prediction for low velocity impact damage in thin composite plates using phased-array ultrasound. A set of low velocity impact damages are induced in thin carbon fiber/epoxy resin matrix composite plates using quasi-static indentation tests. A volumetric reconstruction method is proposed to reconstruct a three-dimensional volume from the raw data, allowing for direct damage identification, localization, and quantification. Using the echo amplitude feature of the reconstructed volume, the 6 dB-drop method is employed to characterize the damage size in terms of volumes and areas. An impact size prediction model is established to correlate the impact energy and the damage volume/area. Comparisons are made between the microscopy measurement of the damage cross-section and results obtained using the developed method.
对于要求高可靠性的应用而言，多层复合材料内部损伤的评估至关重要，然而由于复合材料复杂的失效模式和机理，这仍然是一项挑战。本研究提出了一种使用相控阵超声对薄复合材料板低速冲击损伤进行三维尺寸量化和预测的体积方法。通过准静态压痕试验在薄碳纤维/环氧树脂基复合材料板中诱发了一组低速冲击损伤。提出了一种体积重建方法，用于从原始数据重建三维体积，从而实现直接的损伤识别、定位和量化。利用重建体积的回波幅度特征，采用6dB下降法从体积和面积方面表征损伤尺寸。建立了冲击尺寸预测模型，以关联冲击能量与损伤体积/面积。对损伤横截面的显微镜测量结果与使用所开发方法获得的结果进行了比较。
