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静应力作用下的层合板接头损伤失效分析

Damage failure analysis for composite bolted joints subjected to static loading

  • 摘要: 基于单层板理论,结合有限元分析技术即应力分析、Hashin三维失效判定准则、包含4种基本损伤类型相互关联作用的材料性能退化方法及结构最终破坏判据等,建立了含辅助铺层层合板接头静载损伤失效分析方法. 同时,对层合板接头损伤扩展进行了模拟分析,损伤计算结果与试验分级加载试样X光进行了对比. 通过多种类型层合板接头静强度预测结果与试验结果对比及静载累积损伤规律分析表明,建立的静载三维累积损伤分析的强度预测方法可方便模拟不同结构尺寸层合板接头内部各铺层损伤起始、发展及结构最终破坏整个累积过程,同时获得其最终破坏强度及破坏模式. 该方法的预测结果与试验结果吻合较好.

     

    Abstract: A progressive damage method for predicting the staticstrength and damage failure of mechanically fastened joints infibre-reinforced plastics is established in the paper based on the classicallaminate theory, the three-dimensional Hashin-type failure criteria , thefailure criteria of the structure and material property degradation rulesrelated to the correlation among four basic damage mechanisms. Damageaccumulation in composite bolted joints was investigated and compared withthe X-radiographs of fractured specimens under multistep loading. Numericalresults have been demonstrated that the method established in the paper iscapable of predicting the ultimate tensile strength and the failure mode ofjoints and can be applied to simulate the whole process of failureinitiation, propagation and catastrophic failure of the structure. We findan excellent agreement between the results from the present scheme and theexperimental data.

     

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