A considerable amount of theoretical and experimental research on strength theory of materials under complex stress state was done in the 20th Century.
在20世纪，关于材料在复杂应力状态下的强度理论进行了大量的理论研究和实验研究工作。
Based on the size effect of structure fracture and the strength theory of fabric bundles, the macro statistical scaling effect of materials is achieved.
从结构破坏的尺寸效应入手，利用纤维束强度理论，得到了材料的宏观统计力学效应。
Based on the micro mechanical feature of materials and the strength theory of fibrous bunchiness, the macro statistical size effect of materials was gained.
从材料的微观力学性质入手，用纤维束强度理论，得到了材料的宏观统计力学效应。
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