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提出一种基于虚拟裂纹闭合技术的界面元模型,用以模拟复合材料的分层破坏和预测结构的承载能力。界面元被嵌入在模型分层扩展路径上,计算结构的能量释放率,结合幂指数破坏准则,模拟复合材料的分层扩展。对由于裂尖单元长度不同所带来的分析误差进行了适当的修正,以降低网格粗细变化所带来的不利影响。为了检验该界面元的可靠性,分别将其应用于对双悬臂梁(DCB)模型、端边切口(ENF)模型和混合模式弯曲(MMB)模型的分层扩展分析中。计算结果与解析解基本吻合,从而验证了采用该界面元模拟复合材料分层破坏的可行性。用该方法对3个含有不同初始损伤复合材料T型接头的界面拉脱分层破坏进行数值模拟,计算结果与试验数据吻合良好。
An interface element model based on the virtual crack closure technique is proposed to simulate the delamination of the composite material and predict the bearing capacity of the structure. The interface element is embedded in the model hierarchical extension path, and the energy release rate of the structure is calculated. Combined with the power failure criterion, the layered expansion of the composite material is simulated. The analysis errors due to the different lengths of the crack tip units are properly corrected to reduce the adverse effects caused by the change of the grid thickness. In order to test the reliability of the interface element, it is applied to the layered extension analysis of double-cantilever beam (DCB) model, end-edge incision (ENF) model and mixed mode bending (MMB) model respectively. The calculated results agree well with the analytic solution, which verifies the feasibility of using the interface element to simulate the delamination of composite materials. The method is used to simulate the interface delamination and delamination of three T joints with different initial damage. The calculated results are in good agreement with the experimental data.