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为了进行复合材料层合板的冲击损伤识别研究,设计了由小到大的14个等级的冲击能量,对应由小到大的冲击损伤,其中最小能量的冲击没有造成损伤,最大能量的冲击造成穿透复合材料板的损伤。应用冲击过程中测试得到的应变响应进行损伤识别。基于冲击过程中获得的脉冲应变信号,提出了10个新的冲击损伤识别指标:脉冲上升时间、下降时间、总时间、上升时间比下降时间、下降时间比上升时间;脉冲上升面积、下降面积、总面积、上升面积与下降面积之比、下降面积与上升面积之比。将提出的10个新冲击损伤识别指标与冲击能量的关系进行了对比研究。研究表明:脉冲下降时间、脉冲总时间、脉冲下降面积、脉冲总面积与冲击能量之间的关系大体上都是单调的,这4个指标适合0.8J/mm到6.67J/mm的大范围的冲击损伤程度识别,其余6个指标在一定的冲击能量范围内可以识别冲击损伤程度。应用脉冲下降面积、脉冲总面积指标进行了冲击定位识别研究,研究表明,这两个指标也可以识别冲击损伤的位置。
In order to study the impact damage identification of the composite laminates, 14 types of impact energy are designed from small to large, corresponding to as small as possible impact damage, of which the impact of the minimum energy causes no damage and the impact of the maximum energy causes wear Through the composite board damage. Applying the strain response obtained during the impact test for damage identification. Based on the impulse strain signal obtained during the impact process, 10 new identification criteria for impact damage are proposed: pulse rise time, fall time, total time, rise time fall time, fall time rise time, pulse rise area, fall area, The total area, the ratio of rising area to falling area, the ratio of falling area to rising area. The proposed 10 new impact damage identification index and impact energy were compared. The results show that the relationship between pulse descent time, total pulse duration, pulse descent area, total pulse area and impact energy is generally monotonous. These four indexes are suitable for a wide range of 0.8J / mm to 6.67J / mm Impact damage identification, the remaining six indicators in a certain range of impact energy to identify the degree of impact damage. The application of pulse falling area and pulse total area index to study the impact localization and identification shows that these two indexes can also identify the impact damage location.