| 唐世斌,唐春安,梁正召.接触面损伤演化过程的数值模型[J].计算力学学报,2011,28(1):146~151 |
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| 接触面损伤演化过程的数值模型 |
| Numerical model for damage evolution of contact interface of solid |
| 投稿时间：2009-02-22 修订日期：2010-06-17 |
| DOI：10.7511/jslx201101026 |
| 中文关键词: 损伤演化 接触单元 破坏过程 数值模拟 |
| 英文关键词:damage evolution contact interface element failure processes numerical model |
| 基金项目:国家重点基础研究发展计划(2007CB209404);国家自然科学基金(51004020,50804006,50778046,50809012)资助项目. |
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| 中文摘要: |
| 结合接触面在细观尺度上的非均匀性及其损伤演化规律,提出了一种可以考虑接触面损伤演化过程的数值模型。数值模拟得到的剪切应力-剪切位移关系表明:随着剪切位移的增加,接触面上产生的损伤单元导致曲线斜率逐渐降低;当接触面被完全剪断后,模型中的剪切应力出现了一定程度的下降,此后的剪应力在摩擦力的作用下基本保持不变。模型所能承受的最大剪应力随着垂直应力的增加而增大。整个损伤过程揭示了非均匀性的存在是非线性变形的根本,而高的剪应力是产生剪切损伤的根源。损伤的产生使得应力在损伤点得以释放,并转移到其前端未损伤的接触单元上。这种损伤-应力调整的循环规律贯穿整个变形过程,直至模型中的接触面被完全剪断。 |
| 英文摘要: |
| On the basis of the deformation and heterogeneity feature of contact interfaces of rock mass at mesoscopic level, a numerical model is proposed to simulate the damage evolution processes of contact interface. The relationships between shear stress and shear displacement with different vertical pre-existing loading indicated that damage occurred on the interface gradually at the beginning of shear loading, resulting in decrease of growth rate of shear stress. However, as the interface was fully damaged, shear stress would decrease to a certain degree, and the residual shear stress nearly kept a constant value which equal to the friction force. It also indicated that the maximum shear stresses increased with the increasing of normal stresses. The damage processes revealed that heterogeneity is the source of nonlinear deformation, and high shear stress is the reason of shear damage. Shear stress would be released at the damaged points and transfer to the crack tips. The coupling of damage, stress release and stress transfer processes run through the whole deformation history until those interface elements were damaged entirely. |
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