It is based on a database of past PDC bits. In the databased, it includes bit type, average shear stress of well which bit was used in, cost per unit length.
该方法以一个建成的PD C钻头使用资料库为基础，该数据库包括钻头型号、所钻井段地层的平均剪切强度、单位进尺钻井成本等指标。
The statistical results show that the average, the range of change, and the changing rate were augmented with ECP, i. e. the phasic characteristics of shear stress were increased.
统计结果表明：体外反搏使剪切应力的平均值、变化范围及变化速度都发生了变化，即增加了血流和剪切应力的脉动性。
Water content wand initial average principal stress pm0 have significant influences on the initial dynamic shear modulus of undisturbed loess under the condition of pre-shearing stresses.
含水率与初始平均主应力对预剪应力作用下原状黄土的初始动剪切模量具有显著的影响；
The degrees of effects of water content wand initial average principal stress pm0 on the dynamic shear modulus of undisturbed loess reduce under the condition of pre-shearing stresses.
存在预剪应力作用时，含水率与初始平均主应力对原状黄土动剪切模量的影响程度降低；
We have proposed a method to estimate average tectonic ambient shear stress value for a region.
提出了一种估计一个地区平均构造剪应力值的方法。
The results show that strength of NEPE solid propellant under multi-axis stress state is related to strain; octahedral shear stress nonlinearly increases with the average main stress.
研究表明，多轴应力状态下NEPE固体推进剂强度与应力相关，八面体剪应力随平均主应力的增加呈非线性增加；NEPE推进剂的破坏强度随拉伸速率的增加而提高。
It is shown that the shear strength of joint is concerned with normal stress and weighted average of mean profile angles of joint surface.
说明节理的抗剪强度与法向应力和节理表面形貌特征参数有关。
It is shown that the shear strength of joint is concerned with normal stress and weighted average of mean profile angles of joint surface.
说明节理的抗剪强度与法向应力和节理表面形貌特征参数有关。
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