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首页> 外文会议>International Conference on Fracture and Damage Mechanics(FDM 2007); 20070717-19; Madeira(PT) >Behavior of cracked materials
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Behavior of cracked materials

机译：破裂材料的行为

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摘要

Due to their microstructure, quasi brittle materials present rough cracks. Under sliding of the crack lips, this roughness involves in one hand induced opening and in the other hand some apparent plasticity which is due to the interlocking of the crack lips combined with Coulomb's friction. The proposed model is written under the irreversible thermodynamics framework. Micromechanics uses the Del Piero and Owen's structured deformation theory. Opening of the crack depends upon the crack shape and the relative sliding of the crack lips. The thermodynamic force associated to the sliding has the mechanical meaning of the force acting in order to make the crack slide. Yield surface is defined as a limitation of this force with respect to the Coulomb's friction and the Barenblatt cohesion. The crack orientation is defined as the one for which the criterion is reached for the lowest stress level. A decreasing cohesion, respect to sliding is supposed. Tension and compression reference cases are envisaged.
机译：由于它们的微观结构，准脆性材料会出现粗糙的裂纹。在裂纹唇的滑动下，这种粗糙度一方面涉及引起的张开，另一方面涉及一些明显的可塑性，这是由于裂纹唇的互锁以及库仑摩擦所致。提出的模型是在不可逆的热力学框架下编写的。微力学使用Del Piero和Owen的结构化变形理论。裂纹的开度取决于裂纹的形状和裂纹唇的相对滑动。与滑动相关的热力学力具有为了使裂纹滑动而作用的力的机械含义。屈服面定义为该力相对于库仑摩擦和巴伦布拉特内聚力的限制。裂纹取向定义为达到最低应力水平的准则。内聚力相对于滑动是下降的。设想了拉伸和压缩参考情况。

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