研究了在简谐激励作用下复合材料加筋板基体微裂纹损伤的演化行为及其对加筋板动力特性的影响.基于平均微裂纹密度和断裂力学方法,建立了复合材料加筋板基体微裂纹演化的刚度退化准则.由于该准则考虑了载荷作用周期数的影响,从而能够更合理地分析周期性动载荷作用下基体微裂纹损伤演化规律.采用Mindlin一阶剪切理论和复合材料模态阻尼模型,建立了复合材料加筋板动力分析的有限元方法,研究了在简谐激励作用下,含分层损伤复合材料加筋板振动过程中诱发的基体微裂纹损伤的演化、刚度退化,频率折减和动力响应.
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