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给出了一种表述脆性材料损伤的方法,提出了一种适用于岩石混凝土这类脆性非均匀材料的强度准则,称为应变强度分布准则。该准则以应变作为强度指标,并假设应变强度在空间中服从某种分布规律。提出了一种含裂缝的可均匀化的代表性体积单元,在代表性体积元内引入了完整度和破裂度的概念,定量的表征破坏比,在细观尺度上将未达到强度的完整材料部分用线弹性表述,将达到过应变强度的损伤部分用接触摩擦表达,建立了拉伸破坏、剪切破坏以及拉剪破坏的统一表述方式,形成了新的描述脆性材料宏观变形破裂特性的渐进损伤的破坏准则和本构模型。
A method to describe the damage of brittle materials is given, and a kind of criterion of strength suitable for brittle and inhomogeneous materials such as rock concrete is proposed, which is called the criterion of strain intensity distribution. The criterion uses strain as an indicator of strength and assumes that the strain strength follows a certain distribution in space. A homogenized representative volume unit containing fractures was proposed. The concepts of completeness and rupture were introduced into the representative volume units. Quantitative characterization of the destruction ratio and complete material at the mesoscopic scale that did not reach the strength Part of the elastic expression of the line, the strain intensity has reached the part of the contact friction expression, the establishment of the tensile failure, shear failure and tensile shear failure of the uniform expression of the formation of a new description of brittle material macroscopic deformation and fracture characteristics of the gradual Damage damage criterion and constitutive model.