Abstract The Mohr failure criterion has been re-examined and re-presented in a rational manner in the context of brittle materials. The generic assumptions and their logical inferences have been elaborated, as well as the basic assumption of the isotropy of the material. It has been revealed for the first time that the assumption that ‘failure is determined by the stresses exposed on the fracture plane’ relies on the basic assumption of isotropy and its adoption in the establishment of popular modern failure criteria for anisotropic composites is therefore deemed to be out of context. Based on the generic assumptions and well-established experimental observations on the fracture of brittle materials under uniaxial tension, pure shear and uniaxial compression and through rational reasoning, the characteristics of the failure envelope on the tensile side have been deduced, revealing many features which have never been fully established previously. From the perspective of the Mohr criterion, the Coulomb-Mohr criterion has been given a thorough and objective appraisal, leading to a complete dismissal of it as a criterion of practical relevance.

中文翻译：

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莫尔失效准则的反思

摘要 在脆性材料的背景下，Mohr 破坏准则已被重新审视并以合理的方式重新呈现。已经阐述了一般假设及其逻辑推论，以及材料各向同性的基本假设。首次揭示了“失效由暴露在断裂平面上的应力决定”的假设依赖于各向同性的基本假设，因此在建立各向异性复合材料的流行现代失效标准时采用该假设被认为是断章取意。基于对脆性材料在单轴拉伸、纯剪切和单轴压缩下断裂的一般假设和成熟的实验观察，并通过合理推理，拉伸侧破坏包络的特征已经推导出来，揭示了许多以前从未完全建立的特征。从莫尔判据的角度来看，库仑-莫尔判据得到了彻底和客观的评价，导致其作为具有实际相关性的判据被完全摒弃。