线应变（linear strain）是指物体受力产生变形时，单位长度线元的变化量。
为实现机械构件线应变的非接触式实时在线定量检测提供新的技术与方法。
Thus new technology and method for realizing non-contacting real-timed on line quantitative detection on linear strain of mechanical components were provided.
但是，在研究变形程度对金属组织和性能的影响时，习惯上主要考虑了线应变，而未考虑切应变。
But conventionally, strains (tensile and compressive strains), not shear strains, are taken into consideration when the influence of deformability on metal structure and behaviours is studied.
提出了由潮汐线应变的组合观测资料获取地表平面应变状态和对潮汐剪切应变进行数值模拟的方法。
A method is presented, by which the plane strain state on the earth's surface can be obtained with the combination of tidal line strain data and the tidal shear strain can be simulated numerically.
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