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对由玻纤增强聚合物蒙皮及改进酚醛核所组成的新型纤维组合夹芯梁进行抗弯性能研究。采用4点弯曲静力试验确定组合夹芯梁在平放和侧放时的强度和破坏机制。研究结果显示:组合夹芯梁在侧放位置时的破坏荷载比平放位置时高。在弯曲荷载下,侧放的组合夹芯梁的破坏是由于蒙皮的连续破坏造成的,而平放的组合夹芯梁的破坏是由于核的剪切破坏或蒙皮和核之间剥离使蒙皮受压而产生的脆性破坏。分析预测及数值模拟结果与试验吻合较好。
The flexural properties of the new fiber composite sandwich beam composed of glass fiber reinforced polymer skin and modified phenolic core were studied. The 4-point bending static test was used to determine the strength and failure mechanism of the composite sandwich beam when it was placed and laid sideways. The results show that the breaking load of the combined sandwich beam is higher than that of the lay-up position. Under bending load, the collapse of the side-mounted composite sandwich beam is caused by the continuous failure of the skin, while the collapse of the flat combined composite sandwich beam is due to the shear failure of the core or the peeling between the skin and the core Brittle pressure generated brittle damage. The results of analysis and prediction and numerical simulation are in good agreement with the experimental results.