如果用拉力和压力重复地交替加载金属，金属强度就会减少。
P96 the strength of metals is reduced if they are repeatedly loaded alternately in tension and in compression.
后来的几十年里，压力和拉力逐渐积累。
Over the decades, the stresses and strains gradually built up.
对结构进行精确计算各种单独的压力和拉力，这就叫应力分析。这或许是桥梁建设中最复杂的技术。
The calculation of the precise nature of the individual stresses and strains in the structural, called analysis, is perhaps the most technically complex aspect of bridge building.
在上述基础上提出的环墙侧压力、环拉力和温度收缩应力的计算公式，可供工程设计中采用。
On this base, the formula used for calculating the side pressure of ring wall, ring tensile and temperature contraction stress is established for engineering design.
粘接的结果增强了交联键强度，而降低了在压力、拉力和剪切力作用下，比较容易分离的现象。
This results in a much stronger bond that lasts longer and is much less susceptible to separation under compressive, tensile and shear forces.
通过估算空气腔中的最大气体压力和回位弹簧的拉力，基于电磁阀设计基本原理，设计开发了一直动式电磁阀用于控制空气腔的开闭；
Based on solenoid valve design theory, by estimating the maximum air pressure and spring force, a direct operated solenoid valve is designed to control the open and close of the air chamber.
空腹屋架下弦处于预压力、强大的轴拉力、弯矩和剪力共同作用下工作。
The lower chord of a vierendeel truss, when loaded, is subjected to the combined action of prestressed compression, large axial tension, moment and shear.
该方法包括以下步骤：A、确定区域空间开发所受到的四种作用力为拉力、支撑力、阻力和压力；
The method comprises the following steps of: A, determining four acting forces for regional space development, namely pull, support force, resistance and pressure;
位于水平梁和垂直梁之间的对角梁承受压力和拉力。
Diagonal beams has extended between the horizontal and vertical beams give support against both compression and tension.
通过使用和滥用测试单独地验证每一个保护系统，例如冲击测试，扭力测试和拉力测试或压力测试。
Qualify each retaining system independently by the use and abuse tests such as Impact test, Torque and Tension test, or Compression test.
通过使用和滥用测试单独地验证每一个保护系统，例如冲击测试，扭力测试和拉力测试或压力测试。
Qualify each retaining system independently by the use and abuse tests such as Impact test, Torque and Tension test, or Compression test.
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