在应变软化材料的主裂缝尖端存在一断裂过渡区。
There is a fracture process zone near the crack tip for the tensile strain softening materials.
在裂缝的极限情况下，还给出裂缝尖端附近的应力解。
For the limiting case of a crack, the stress state in the vicinity of the crack tipis given.
研究了裂缝尖端附近三维应力分布 ，及沿厚度方向的应力分布。
The results descube the development of the 3-D stress distribution near the crack tip. The analysis show…
数值结果表明，地震时传播裂缝尖端附近可产生几百度至近千度的温升。
The numerical results have shown that when an earthquake is occurring, the temperature rise near the propagating crack tip may reach several hundred to near one thousand degree.
气体压力分布影响裂缝尖端应力强度，因而不能用传统的破裂压力来判断裂缝起裂扩展。
Since the pressure gradient affects stress strength of crack top, it is unsuitable to judge crack initiation by the traditional breakdown pressure.
首先，对反射裂缝尖端应力场的奇异性进行了描述，建立了平面断裂问题应力强度因子的有限单元解。
Firstly, after depicting the singularity of stress field at the top of crack, the finite element method to calculate stress intensity factor of plain fracture problems is founded.
本文采用三维有限元模型分析了荷载作用下自上而下裂缝尖端的应力强度因子，并与二维平面应变模型分析的结果进行比较。
In this thesis, the stress intensity factors of top-down cracks caused by loading are calculated using three dimensional finite element model and compared to the results of plane strain model.
探讨了单裂缝与均布多裂缝情况下，裂缝深度、裂缝形状，厚壁筒壁率、裂缝数目等特性参量对裂缝尖端附近奇异场的影响。
The effect of crack depth, crack shape, wall thickness ratio, the number of cracks etc. on singular stress field near the crack tip is investigated.
对路面突然降温时的温度场进行了数值模拟，计算了温度应力作用下反射裂缝尖端的拉应力、应力强度因子，并对其进行了参数分析。
Crack top's tension stress and stress intensity factor caused by thermal stress were computed, structural parameters' sensitivity analysis were made as well.
为研究初始裂缝尖端起裂的条件和所需注水压力，依据断裂力学的复合型裂纹的脆性断裂理论，建立了裂缝尖端力学模型，给出了计算方法。
For researching crack initiation condition and water injection pressure needed, this paper built up a mechanics model of crack tip based on crisp fracture theory of compound crack.
为研究初始裂缝尖端起裂的条件和所需注水压力，依据断裂力学的复合型裂纹的脆性断裂理论，建立了裂缝尖端力学模型，给出了计算方法。
For researching crack initiation condition and water injection pressure needed, this paper built up a mechanics model of crack tip based on crisp fracture theory of compound crack.
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