【摘要】 在建立岩石等脆性材料切割的力学模型基础上，采用有限无法对切割时呈现的力学状态进行了分析，且对刀刃压入后裂纹的产生和扩展初始阶段进行了模拟。其结果表明，对内部缺陷较少的岩石，以应力基准判定裂纹的产生是可行的；裂纹的类型与材料的脆性度有关；切削阻力随切入深度增大呈非线性增加；裂纹扩展的初期路径与刀具的前角有关。更多还原

【Abstract】 On the basis of establishing a mechanical model of brittle materials(rock)cutting,the finite element method was used to analyze a mechanical behaviour shown inthe cutting process,and the initiation and propogation of crack at initial stage,after pene-tratim of cutting blade,were simulated. The results have shown that it is feasible for theless interior defect rock to judge an initiation of crack by the stress criteria,The cracktypes are related to material brittleness index. The cutting resistance is increased with theincrease of cutting depth and shows a non- linear increase. The initial path of crack pro-pogation is related with a rake angle of the cutting blade.更多还原