工程结构构件的基本变形形式之一。对于受拉伸或压缩的等截面直杆（棱柱形杆），根据杆受力时横截面保持为平面的假设，则横截面上无剪应力τ,而其正应力σ为均匀分布，其值等于轴力N 除以横截面面积A,即σ=N/A；当材料在线弹性范围内工作时，根据胡克定律（见材料力学）,杆内一点处的轴向（纵向）线应变为ε=σ/E（E为材料的拉、压弹性模量）;在轴力N 为常量的长度L范围内，绝对线变形ΔL的计算公式为ΔL=NL/EA。
...拉伸和压缩 [gap=769]Keywords】: building of model; pseudo-well; well controlling zone; horizon; stretching and compressing ...
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还测试了股骨、胫骨拉伸和压缩时的破坏强度。
The tension and compression ultimate strengths of femur and tibia were tested, too.
本文给出了凝聚映射的范数型锥拉伸和压缩定理。
In this paper, we showed the nome-type compression and expansion theorem of condensing maps.
人们通常假定玻璃在拉伸和压缩状态下的流变模型是相同的。
It has been generally supposed that the rheological models of glass either under compression or tension are the same.
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