发生腐蚀后，接箍形状不规则更容易发生应力突变，其使用寿命大大减小。
After corrosion, the pipe band with irregularities is more susceptible to sharp stress change, which will greatly reduce the service life.
笔者对接箍腐蚀的特点、原因和规律等问题开展了研究。结果表明，应力突变是发生腐蚀最关键的原因，特别是轴向应力占主导作用。
The corrosion characteristic, causes and laws of pipe connection bands are extensively studied, which shows that a sharp change of stress is the critical factor for corrosion, especially axial stress.
采用变形法计算混凝土应力时，假设应力在各个时段内以突变形式增加，并对这种假设带来的误差进行了分析。
When the deformation method was used for concrete stress calculation, it was assumed that the stress increased suddenly at each stage, and such an assumption led to certain errors.
在此基础上，应用能量原理及突变理论推导矿柱失稳的临界载荷及临界应力，提出矿柱发生失稳的屈曲模型。
The critical load and critical stress were deduced by means of energy principle and catastrophe theory based on these conditions, and the buckling model of pillar was presented.
该法适用于区域内点、围绕边界的尖角点、边界或内部同心圆弧及同心圆四种特殊区域的网格改进，为实际工程结构应力梯度突变或变化较大处网格细化提供了十分方便的手段。
The scheme adapts to refine the meshes of special regions, such as interior points, around corner points, arcs and circles, which are usually failure regions of parts because of great stress gradient.
为提高精度，在渐变应力比突变应力更符合实际的基础上提出应力在各时段内线性变化的假定，在此假定下推导了应力计算的一般公式，用于实测应变资料的分析计算。
Based on an analysis of the sources of errors, a linear variation of the stress at each stage was assumed, and a general formula for stress calculation was deduced.
在同一平面内，同一种地应力在不同点的大小方向有一定的变化，但没有出现突变现象，说明矿区地应力场比较均匀。
In the same plane, a kind of in-situ stress has some but not significant change in both magnitude and direction at different points, indicating a uniform in-situ stress field in the mining area.
绝缘层的突变（指电缆端部）引起非常大的集中的电应力（电场强度），这可通过电缆穿出地面时采用昂贵的称为“电缆头”的端部来消除。
Abrupt insulation changes cause very large concentrated electrical stresses. These stresses can be eliminated by terminating the cable above ground in an expensive device known as pothead "."
绝缘层的突变（指电缆端部）引起非常大的集中的电应力（电场强度），这可通过电缆穿出地面时采用昂贵的称为“电缆头”的端部来消除。
Abrupt insulation changes cause very large concentrated electrical stresses. These stresses can be eliminated by terminating the cable above ground in an expensive device known as pothead "."
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