Abstract To understand the mechanisms of damage initiation and propagation in glass microballoon (GMB)/silicone elastomer matrix syntactic foam composites, multiscale X-ray computed tomography images obtained during in situ compression were analyzed using quantitative image processing and digital volume correlation (DVC) techniques. High-resolution tomograms revealed that both the initiation and propagation of GMB collapse depended on the local clustering of GMBs, leading to the formation of pseudo-crush bands in the composite. This resulted in prominent bands of axial strain variation that grew to several millimeters in length as revealed by DVC. A new mechanism based on stress redistribution around collapsed GMBs is proposed to explain the damage propagation, which is supported by finite element analysis and successfully captures the effects of cluster orientation on the observed damage.

中文翻译：

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弹性泡沫复合材料的损伤机制：多尺度 X 射线计算机断层扫描和有限元分析

摘要 为了了解玻璃微球 (GMB)/有机硅弹性体基复合泡沫复合材料中损伤的发生和扩展机制，使用定量图像处理和数字体积相关 (DVC) 技术分析了原位压缩过程中获得的多尺度 X 射线计算机断层扫描图像。 . 高分辨率断层扫描图显示，GMB 坍塌的启动和传播都取决于 GMB 的局部聚集，导致复合材料中伪挤压带的形成。这导致显着的轴向应变变化带，如 DVC 所揭示的那样，长度增加到几毫米。提出了一种基于坍塌 GMB 周围应力重新分布的新机制来解释损伤传播，