Void nucleation on grain boundary (GB) has been regarded as an important mechanism of damage initiation in ductile polycrystalline materials under dynamic loading. The high tensile stress induced by this loading mode enables interface incompatibility (i.e. the incompatibility of mechanical properties across the GB) to significantly affect intergranular spall damage initiation. In the present work, the concept of compatibility energy release rate is proposed to quantify the influence of interface incompatibility on interfacial failure. A tensor-formed criterion incorporating the compatibility energy release rate is established for modeling GB void nucleation in dynamic failure of ductile metals. We show that considering interface incompatibility enables the model to accurately describe the dependence of GB void nucleation on multiple factors reported by experiments and simulations, including the loading state and the GB characteristics. A statistical model on the basis of the criterion, aimed at further analyzing statistical features of GB void nucleation, provides a valid reference for quantitatively assessing the GB damage resistance and gives a physical explanation for the widely-adopted Weibull-form distribution of the nucleation stress.

晶界（GB）空洞形核被认为是动态载荷下韧性多晶材料损伤起始的重要机制。这种加载模式引起的高拉伸应力使界面不相容（即整个GB的机械性能不相容）显着影响晶间剥落损伤的开始。在目前的工作中，提出了相容性能量释放率的概念来量化界面不相容性对界面失效的影响。建立了包含相容性能量释放率的张量形成准则，用于模拟韧性金属动态失效中的 GB 空洞形核。我们表明，考虑界面不相容性使模型能够准确地描述 GB 空隙成核对实验和模拟报告的多个因素的依赖性，包括加载状态和 GB 特性。基于该准则的统计模型旨在进一步分析GB空洞形核的统计特征，为定量评估GB抗损伤能力提供有效参考，并为广泛采用的Weibull形核应力分布提供物理解释.