stress exponent

To level stress, the relation of their slope approximatively shows the exponent function relation;

对于水平应力，其斜率间的关系近似成指数关系；

The relationship between permeability and effective stress is approximatively exponent but is necessary to correct at high temperature and water-saturate level.

渗透率与有效应力近似呈指数关系变化，但随着温度和含水饱和度的增加需要作校正处理；

The testing results show that the porosity of sandstone decreases with increasing effective stress at the fixed temperature level, following the law of negative exponent.

试验结果表明，有效应力对砂岩孔隙度的影响较大，在温度一定的情况下，砂岩的孔隙度随有效应力的增加而呈负指数规律减小；

The relationship of stress versus strain of this asphalt mortar under the constant tension load is obtained using the non linear regression analysis, which is well in coincidence with the viscoelastic four parameter liquid model and exponent model.

并应用非线性回归分析得到该材料受单轴恒定荷载下的应力应变关系，可较好地符合粘弹性四元流体模型（即伯格斯模型）和指数模型。

The effect of relevant process parameters, namely tool radius, sheet thickness, step size, wall angle, yield stress and hardening exponent, upon their intensity was statistically analyzed.

对工具头半径、板厚、加工步长、成形角、屈服应力和加工硬化指数等参数对成形缺陷的影响程度做了计算。