静应力作用下的层合板接头损伤失效分析

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.

DAMAGE FAILURE ANALYSIS FOR COMPOSITE BOLTED JOINTS SUBJECTED TO STATIC LOADING

A progressive damage method for predicting the static strength and damage failure of mechanically fastened joints in fibre-reinforced plastics is established in the paper based on the classical laminate theory, the three-dimensional Hashin-type failure criteria , the failure criteria of the structure and material property degradation rules related to the correlation among four basic damage mechanisms. Damage accumulation in composite bolted joints was investigated and compared with the X-radiographs of fractured specimens under multistep loading. Numerical results have been demonstrated that the method established in the paper is capable of predicting the ultimate tensile strength and the failure mode of joints and can be applied to simulate the whole process of failure initiation, propagation and catastrophic failure of the structure. We find an excellent agreement between the results from the present scheme and the experimental data.