The horizontal and vertical stresses are concave upward in plastic zone.
在塑性区，水平及垂直应力均是上凹的。
And the relation between plastic zone size and load frequency is only qualitatively analyzed up to now.
而对载荷频率与塑性区域尺寸之间关系仅有定性描述。
The main reason is that the speed of laser welding is very fast and the plastic zone is considerably narrow.
这主要与激光焊接线能量小，塑性变形区窄有关。
Crack propagation is affected by many factors, among which, the crack tip plastic zone attracts a lot of attention.
影响裂纹扩展的因素有许多，这其中，裂纹尖端塑性区引起众多研究者的兴趣。
The construction disturbance mainly occurs within the plastic zone with the heave of ground surface as a byproduct.
施工扰动以塑性区为主，塑性区地面发生隆起。
The magnifying coefficient and the area of plastic zone of surrounding rock increase with the increase of amplitude.
围岩塑性区面积也随振幅增大而增大。
In this method, the elastic area and plastic zone can be distinguished and the different flow rules can be considered.
该方法可以考虑弹性区与塑性区的区别，并可以考虑不同的流动法则。
A formula of the stress and the width of plastic zone in strip coal pillars is derived by strictly mathematical calculation.
通过数学运算推导出条带煤柱塑性区应力及宽度的表达式。
Comparison of four different combinations of the same time, the stress and strain distribution, the size of the plastic zone.
同时对比了在四种不同组合时，应力、应变的分布，塑性区范围的大小。
The plastic zone by the hole edge and its effect on the initiation and propagation of the small crack also were investigated.
对于这类小裂纹扩展机制的分析目前还比较少。
The nature reason of these phenomena was that the radial and axial plastic zone distributions were different in cold ring rolling.
这些现象的本质是环件冷辗扩过程中的径向和轴向塑性区的分布不同。
Plastic zone and its development trend can be attained, based upon that found equation when load and boundary conditions are given.
根据方程可以确定给定条件下塑性区的范围、发展趋势以及应力演变过程。
The calculation shows that the radius and displacement of plastic zone will reduce when the neutral principal stress is considered.
计算表明考虑中间主应力时圆筒形孔的塑性区半径有明显减少。
Theoretical analysis shows that coal pillars plastic zone width not only with mining depth, mining height, but with the recovery rate.
理论分析表明，煤柱塑性区宽度不仅与采深、采厚有关，而且也同采出率有关。
The dislocation distribution function in the plastic zone at a crack tip is calculated with the help of a modified BCS-type crack model.
本文改进BCS型裂纹位错模型，并对裂纹顶端范性区的位错密度分布进行了计算。
While the interfacial bond property is unchanged, the width of plastic zone of pillar increases with the increase of buried depth of coal seam.
当煤层顶底板粘结性能一定时，随煤层埋深的增加，煤柱塑性区宽度增加。
The study results show that the stresses in elastic zone are related with the vertical geostress, but the stresses in plastic zone are opposite.
研究结果表明，弹性区内任一点的应力大小与垂直地应力有关，而塑性区内任一点的应力与原始垂直地应力无关；
By employing the shear lag theory, the basic equations of interfacial mechanics for the elastic zone and the plastic zone are established respectively.
利用界面应力剪滞理论，分别建立弹性区和塑性区的界面力学基本方程。
The result of elastoplastic analysis proves that the effects of fault on the distribution of tunnel surrounding rock mass plastic zone also are significant.
进一步验证了前一部分研究工作的可信性。弹塑性分析的结果说明断层对隧洞围岩塑性区的分布也有明显的影响。
The influence of softening extent on stress, displacement and the radius of plastic zone during expansion as well as the extreme expansion pressure are studied.
分析了剪胀和软化程度对球孔扩张时的应力、位移、塑性区半径及极限扩张压力等方面的影响，并将大、小应变理论的结果进行了比较。
The expressions of elastic deforming volume and plastic deforming volume in the plastic zone were presented together with the average plastic volumetric strain.
给出了塑性区中平均体积应变及弹、塑性变形体积的计算公式和剪胀角的测试方法。
The result shows: the local residual tensile stress and cyclic compressive loading thrust fatigue crack initiation and propagation in the size of compressive plastic zone.
结果表明，疲劳裂纹是在残余拉应力和循环压应力作用下萌生和扩展的，压塑性变形是裂纹萌生和扩展的必要条件。
The plastic zone size of the crack tip is relative to three dimensional constraint which depends upon not only the plate thickness but also the load and the material property.
裂纹尖端塑性区的大小与其三维约束状态有关，而三维约束状态不仅与板厚还与外载荷、材料性质有关。
The plastic zone of the surrounding rock mainly concentrates around the tunnel and the two sides of karst cave while the top and the bottom of karst cave have little plastic zone.
围岩塑性区主要集中在隧道的周围和溶洞的左右侧部，溶洞的顶部和底部处塑性区较少。
In this model, the plastic zone induced by the overload is affected by the three-dimensional constraints, and it leads to significant influence on the crack closure and growth rate.
在此模型中，裂尖的三维约束状态显著影响超载塑性区，从而显著影响裂纹的闭合和扩展速率。
The exact solution of linear elastic fracture mechanics is suggested in this paper and the plastic zone of crack tip is calculated under the condition of strain-hardening of material.
本文从线弹性断裂力学的精确解出发，在考虑材料强化影响的情况下，计算出裂纹前缘的塑性区。
The paper highlights the application of the orthogonal finite element method to explore the impact of variable levels and the different parameters on the thickness of the plastic zone.
采用正交有限元方法来考察不同参数、不同水平的变化对塑性带厚度的影响。
Pure elastic fracture is always rare, so th at under the action of stress, a plastic zone(large or small), and interactions between crack and dislocations always exist at the crack tip.
纯弹性断裂总是极少的，因之在加载应力作用下，裂纹顶端总是存在着或大或小的塑性区，存在着裂纹与位错的交互作用。
The plastic zone based models are simple, but they generally include empirical parameters which often lack clear physical significance and have to be determined by a lot of experiments.
屈服区模型比较简单，但当前大部分屈服区模型中的相应参数需要通过多组试验确定，缺乏明确的物理意义。
The main parameters in tests are the percentages of longitudinal steel in beam, the percentages of stirrups in beam plastic zone and the volumetric percentages of stirrups in joint core.
试件的主要研究参数为梁纵向钢筋配筋率、梁塑性铰区配箍率以及节点核芯区体积配箍率。
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