当压力水平逐渐减小，有一点就是结构能够经历足够应力反向之后继续存在来超越组件的预期寿命。
As the stress level is gradually reduced, there comes a point where a structure can survive enough stress reversals to exceed the component's expected life.
有些人认为硬化的灰铸铁过去曾使零件很容易腐朽老化(因为经过数百万次的应力反向处理后的金属零件最后都会这样)。
Some believe that the hardened gray iron used to make the components simply "fatigues" with age-as metal parts that go through millions of stress reversals eventually do.
有些人认为硬化的灰铸铁过去曾使零件很容易腐朽老化（因为经过数百万次的应力反向处理后的金属零件最后都会这样）。
Some believe that the hardened gray iron used to make the components simply "fatigues" with age—as metal parts that go through millions of stress reversals eventually do.
苏格兰工程师和热力学创始人之一的威廉·兰金(William Rankine)是第一个解释这些重复的应力反向如何能够导致裂缝蔓延。
William Rankine, a Scottish engineer and one of the fathers of thermodynamics, was the first to explain how these repeated stress reversals could cause cracks to propagate.
竹材通过加热、提高含水率和改善竹材的表面状态等三种途径来增加其塑性、减小展平时的反向弯曲应力。
Through heating, raising moisture content and improving the surface condition of bamboo, plasticity of bamboo can be increased, bending stress can be reduced to opposite direction.
在实施过程中，对吸除工艺，应力补偿工艺等作了改进，进一步降低了反向暗电流。
In practical process, a reduction of the reverse dark current is further obtained by improved the gettering technology, stress compensation technology, etc.
气液界面存在同向或反向切应力时，在一定程度上影响到液膜的水动力学特性和流动稳定性，并改变其热质传递特性。
The shear stress at the liquid-gas interface plays an important role on characteristics of the hydrodynamics, flow stability and heat transfer of liquid film.
通过构造反向传播神经网络，对裂纹尖端的应力场进行模拟，进而实现对裂纹尖端应力场函数的逼近。
The stress field around the crack tip is simulated via the constructed Back-Propagation Neural Network (BPNN) whereby achieving the approximation of the stress field around the crack tip.
研究认为，北北东向反向正断层的形成受北东—南西向张应力及右旋剪切力控制，反向正断层的走向与张应力方向基本垂直；
This study shows that the formation of antithetic normal fault is controlled by NE WS strike tensile stress and dextral shear stress and the strike is nearly vertical to the tensile stress.
根据试验结果，研究了压实黏土在三轴压缩、拉伸以及从压缩到反向拉伸状态下的应力应变特性。
Based on the test results, the stress-strain behaviors of compacted clay under triaxial compression, triaxial tension and compression-to-tension states are investigated.
当模具表面冷却时，可发生反向应力，因而表面层将处于拉应力状态。
When the de surface cools, a stress reversal may occur and the surface layers will then ben tension.
在基极-发射极反向偏置的条件下，研究了应力作用时间与器件参数的退化关系。
The relation of stress time to parameter degradation is investigated under the condition of reverse bias of base-emitter junction.
堆冷过程中加盖保温罩能使铸坯在冷却后期恢复平直而不发生反向弯曲，并且铸坯内残余应力也变小了。
The slab came back to be flat without opposite curling at the post stage of stacking cooling with heat preservation cover, and the residual stresses decreased.
堆冷过程中加盖保温罩能使铸坯在冷却后期恢复平直而不发生反向弯曲，并且铸坯内残余应力也变小了。
The slab came back to be flat without opposite curling at the post stage of stacking cooling with heat preservation cover, and the residual stresses decreased.
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