Delamination analysis in advanced composites is required for the laminate design phase and also during the operation of composite aerospace structures to estimate the criticality of flaws and damage. The virtual crack closure technique (VCCT) and cohesive zone modelling (CZM) have been applied to delamination simulation as numerical tools of crack modelling. VCCT and CZM have their unique advantages and disadvantages per application. This study focuses on the application of VCCT to a brittle delamination in a hybrid tungsten–carbon-fibre reinforced composite (CFRP-W) and pursues to identify the challenges due to very high internal residual stresses and strain energy as well as unstable crack propagation. The CFRP-W composites have application areas in high-performance, light-weight radiation protection enclosures of satellite electronics and ultra-high frequency (e.g. 5G) systems. In our work, we present the effects of free-edge stress concentrations and interfacial separation prior to nodal release on a combined VCCT-CZM model and compare the results to pure VCCT and CZM models of the interfacial crack. Parameter notes are given based on the results to apply the combined method for delamination analyses with interfaces heavily loaded by internal residual strains.

在层压板设计阶段以及复合材料航空结构的运行过程中，都需要对高级复合材料进行分层分析，以评估缺陷和损坏的严重程度。虚拟裂缝闭合技术（VCCT）和内聚区建模（CZM）已作为分层的数值工具应用于分层模拟。VCCT和CZM每个应用程序都有其独特的优点和缺点。这项研究的重点是VCCT在钨-碳纤维增强复合材料（CFRP-W）的脆性分层中的应用，并试图确定由于极高的内部残余应力和应变能以及不稳定的裂纹扩展而带来的挑战。CFRP-W复合材料具有高性能的应用领域，卫星电子设备和超高频（例如5G）系统的轻型辐射防护外壳。在我们的工作中，我们介绍了节点释放之前自由边缘应力集中和界面分离对组合VCCT-CZM模型的影响，并将结果与​​纯VCCT和CZM界面裂纹模型进行了比较。根据结果​​给出参数说明，以将组合方法应用于内部残余应变重载的界面分层分析。