李可昊, 刘文光, 黄政. 基于渐进损伤的螺栓连接复合材料板失效分析[J]. 失效分析与预防, 2024, 19(6): 396-403. DOI: 10.3969/j.issn.1673-6214.2024.06.003
    引用本文: 李可昊, 刘文光, 黄政. 基于渐进损伤的螺栓连接复合材料板失效分析[J]. 失效分析与预防, 2024, 19(6): 396-403. DOI: 10.3969/j.issn.1673-6214.2024.06.003
    LI Kehao, LIU Wenguang, HUANG Zheng. Failure Analysis of a Bolted Composite Plate by Progressive Damage Model[J]. Failure Analysis and Prevention, 2024, 19(6): 396-403. DOI: 10.3969/j.issn.1673-6214.2024.06.003
    Citation: LI Kehao, LIU Wenguang, HUANG Zheng. Failure Analysis of a Bolted Composite Plate by Progressive Damage Model[J]. Failure Analysis and Prevention, 2024, 19(6): 396-403. DOI: 10.3969/j.issn.1673-6214.2024.06.003

    基于渐进损伤的螺栓连接复合材料板失效分析

    Failure Analysis of a Bolted Composite Plate by Progressive Damage Model

    • 摘要: 螺栓连接广泛应用于复合材料结构的装配,其连接强度对整体结构的可靠性有着重要影响。本研究通过渐进损伤法分析螺栓接头损伤累积特征与规律,探讨不同失效准则对复合材料结构失效行为预测的影响。首先,分析比较Hashin失效准则与Puck失效准则、指数刚度退化模型与瞬时刚度退化模型的区别;然后基于失效准则与刚度退化模型开发双搭接三螺栓连接复合材料板的有限元模型;最后分析不同失效准则与刚度退化模型组合下螺栓连接复合材料板的位移−载荷曲线,讨论其预测误差,并通过有限元手段研究层合板损伤演化过程。结果表明:基于指数退化的Puck准则对失效载荷预测值误差较低,为8.3%。拉伸破坏是导致复合材料层合板断裂的主要原因。基体拉伸失效先于纤维拉伸失效发生,首先发生在±45°铺层中,后扩展至90°铺层;纤维失效首先发生在0°铺层中,后扩展至±45°铺层;当纤维拉伸损伤由孔周扩展至板边时,层合板最终失效。

       

      Abstract: Bolt connections are extensively employed in the assembly of composite structures, and their connection strength has a significant impact on the reliability of the overall structure. In the light of this issue, the aim of this study is to analyze the characteristics and laws of damage accumulation of bolted joints using the progressive damage method, and to discuss the effects of different failure criteria on the failure behavior. First, the Hashin failure criterion and the Puck failure criterion, along with the exponential stiffness degradation model and the instantaneous stiffness degradation model, are analyzed separately. Subsequntly, a finite element model of a double-lap three-bolt composite plate is developed based on the failure criteria and the stiffness degradation model. Finally, the displacement-load curve is analyzed with different failure criteria and stiffness degradation model taken into account. The impacts of different combination on the prediction error are discussed. The damage evolution process of laminate is studied by using finite element method. The results demonstrate that the Puck criterion based on exponential degradation has the lowest prediction error of 8.3% for the failure load. Tensile failure is the primary reason for the laminate breakage. The tensile failure of the matrix precedes that of the fiber, which occurs first in the ±45° plys and then expands to the 90° plys, while fiber failure initially takes place in the 0° plys and then extends to the ±45° plys. When the fiber tension damage extends from the periphery of the hole to the edge of the laminate, the laminate eventually fails.

       

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