为确定脱胶缺陷对复合材料加筋板屈曲及后屈曲特性的影响,对含不同脱胶缺陷工型筋条的复合材料加筋板进行了压缩试验研究.结果表明,30 mm和50 mm的缺陷对试验件承载能力影响很小,当缺陷尺寸增至80 mm时,试验件后屈曲承载能力明显下降.借助超声检测技术对缺陷的扩展行为进行了监测,结果表明,当压缩载荷达到破坏载荷的85.3％时,预制缺陷的对角位置处出现扩展迹象.通过影像云纹法获得两半波和三半波失稳模态的形成过程.对失稳模态的监测结果还表明,随缺陷长度增加,该型加筋板的失稳模态从三半波向两半波转换.在试验基础上,利用ABAQUS软件建立有限元(FE)模型,依次进行了屈曲及后屈曲过程的数值模拟.屈曲分析用于获得试验件的失稳载荷及模态,在后屈曲分析中将失稳波形以几何扰动的形式引入FE模型,最终计算结果与试验结果基本吻合,表明该模型可以用于复合材料加筋板屈曲及后屈曲性能的预测.
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