1) maximum principal stress
最大主应力
1.
The multi-point fracturing of oil well vertical to the orientation of the maximum principal stress can improve development effectiveness of the ultra-low permeab.
采用交错井网,用直井注水的方法,在油井水平段垂直于最大主应力方向进行多点有效压裂,能有效地提高特低渗透油藏开发效果。
2.
The soil cutting experiment indicates that the interior friction angle and the shear intensity of soil is reduced;and the maximum principal stress is decreased due to the vibration load;it induces the decrease of digging resistance.
从理论上研究了振动掘削岩土的减阻机理,土壤剪切试验结果表明,振动载荷能够使土壤的内摩擦角变小、抗剪强度下降、最大主应力值减小,从而导致挖掘阻力降低;对土壤在静态载荷和振动载荷作用下的失效过程进行了对比仿真实验研究,可知土壤在振动加载的条件下强度显著下降,并提前于相同条件的静态加载而破坏,同时跟踪X方向的载荷发现,振动掘削最大掘削阻力可降低50%。
3.
Because there was dissension in the maximum principal stress orientation obtained by in-situ stress measurements by different results measurements,the principal stress axis was determined by conjugate joints,fault occurrence,rake angle and shift symbol of fault slip.
针对地应力场测量给出的区域最大主应力方向常常有争执,且不同的测量方法结果也不同。
2) maximal principal stress
最大主应力
1.
This paper proposes two identification methods of maximal principal stress and its orientation by analysing the stress formula of bevelface.
通过对平面应力状态下斜面上正应力公式的分析 ,提出了最大主应力方位的两种判定方
2.
The critical J integral and the maximal principal stress under joint intensity theory was used as the criteria of crack starting of con-rod,the stress,plastic strain and displacement field were analyzed,and the distribution of crack starting points were displa.
对连杆准静态裂解进行了数值模拟分析,对裂纹区网格划分、接触与约束处理、无应力投影功能与自适应加载步长等关键技术进行了探讨;运用临界J积分和最大主应力准则作为连杆启裂的判据,分析了启裂时连杆应力场、塑性场及位移场,给出启裂点的分布状况。
3.
Based on the stresses calculated, the maximal principal stress was taken as the control criterion of the effects of H/B and the distance between bridle rods on the stress of cross section of aqueducts, and the relationship between the aqueduct stress and the rod distance was derived.
利用有限元法详细计算了不同H/B下无拉杆和不同拉杆间距简支梁式矩形渡槽槽身的应力,根据计算应力,以最大主应力作为控制标准,分析了H/B以及拉杆间距对槽身横截面应力的影响,提出了渡槽槽身应力与拉杆间距之间的关系。
4) ratio of maximum main stress difference
最大主应力差比
5) maximum compressional stress orientation
最大主压应力
1.
The result shows that for over 95% stations the most prominent change recorded is in the survey line perpendicular or nearly perpendicular to the maximum compressional stress orientation of the focal mechanism solution while the smallest change is in or close to the orientation.
研究了27个强地震附近41个地电台的视电阻率变化,在震前1年尺度~短临阶段,在超过95%的台站上与震源机制解最大主压应力方位正交(或近于正交)测道的视电阻率变化最显著,主应力方位(或近于该方位)的测道的变化反之,其物理机理比较清晰。
6) maximum-tensile-stress criterion
最大主应力理论
补充资料：主应力
主应力
principal stress
zhuyingli主应力(prineipal stress)没有切应力作用的截面上的法向应力。经数学证明，金属塑性加工时于变形物体内某一点的应力状态可用下式所表示的二次曲面来确定: A“一‘X“十乞丁2+氏Z“+2场叉丫 +2殊yZ十2屯Z尤(1)式中A为任意常数，几、丐、么和rx.、，、几分别为作用在通过该点所引三个相互垂直坐标面上的正应力和切应力，X、Y、Z为此二次曲面上某点的坐标。当所取坐标轴的位置发生变化时，即用新的坐标来表示该曲面时，式中各项的系数将发生变化。这样，通过上述确定应力状态的点总可以引出这样三个相互垂直的平面(与坐标面平行)，在其上仅有正应力而无切应力。主应力符号的脚标分别用l、2、3表示，以分别代替正应力的脚标x、y、z。这样，所得到的三个主应力应为。1、。2、a:，分别作用在三个坐标面上。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条