UC知道专业英语翻译 急!!!
来源：百度知道 编辑：UC知道 时间：2024/05/17 00:57:46
3. The intensity of force, that is, the force per unit area, is called the stress and is commonly denoted by the Greek letter σ. Assuming that the stress has a uniform distribution over the cross section [see Fig.1(b)], we can readily see that its resultant is equal to the intensity σ times the cross-sectional area A of the bar. Furthermore, from the equilibrium of the body shown in Fig.1(b), we can also see that this resultant must be equal in magnitude and opposite in direction to the force P. Hence, we obtain σ=P/A (1)
Eq. (1) can be regarded as the equation for the uniform stress in a prismatic bar. This equation shows that stress has units of force divided by area. When the bar is being stretched by the force P, as shown in the figure, the resulting stress is a tensile stress; if the forces are reversed in direction, causing the bar to be compressed, they are called compressive stresses.
Eq. (1) can be regarded as the equation for the uniform stress in a prismatic bar. This equation shows that stress has units of force divided by area. When the bar is being stretched by the force P, as shown in the figure, the resulting stress is a tensile stress; if the forces are reversed in direction, causing the bar to be compressed, they are called compressive stresses.
3. 力的强度，就是单位面积的力度，被称作应力，普遍用希腊字母σ 来表示。假设应力均匀地分布于一个横切面【参阅图1（b）】，我们可以看到它的合力是等于σ倍棒材横切面积A的强度。再者，从图1（b）所显示的材体的平衡，我们也看到此合力与P力的方向相反，而量值是相等的。因此，我们得到σ=P/A (方程1)。
方程1可以被认为是柱形杆平均应力的方程式。此方程显示应力是以力度单位除于面积。当棒材被P力拉伸，如图所示，所产生的应力是拉伸应力；如果所施的力是反方向的，导致棒材被压迫，这称为压应力。
给钱才是硬道理！