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为研究玻璃纤维增强铝合金层板(GLARE)在挤压载荷作用下的损伤起始、演化方式和失效特点,采用超声C扫描、断面分析和扫描电子显微镜对三种铺层方式的GLARE层板单钉双剪实验进行观测。对挤压载荷下层板损伤起始和演化进行了观察对比,分析了铺层方式对层板挤压失效过程和破坏模式的影响。对实验中观察到的金属塑性变形、纤维屈曲、基体开裂、分层扩展等现象之间的关系进行了分析和说明。实验表明,挤压初始阶段,GLARE层板主要由铝合金承载,铝合金进入塑性之后,层板承载特性、损伤过程及最终破坏模式主要受纤维铺层方式影响。
In order to study the damage initiation, evolution and failure characteristics of glass fiber reinforced aluminum alloy laminates (GLARE) under the compressive load, three layers of GLARE laminates were tested by ultrasonic C-scan, cross-section analysis and scanning electron microscopy Single nail double shear experiment was observed. The onset and evolution of the damage under the compressive load were observed and compared, and the influence of the deposition method on the extrusion failure process and failure mode of the laminates was analyzed. The relationship between the phenomena of plastic deformation, fiber buckling, matrix cracking and delaminating and spreading observed in the experiment was analyzed and explained. Experiments show that the initial stage of extrusion, GLARE laminate is mainly carried by aluminum alloy, aluminum alloy into the plastic, laminates bearing characteristics, damage process and the ultimate failure mode is mainly affected by fiber layup.