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HIGH SCHOOL

Engineering

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Mechanical Engineering

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Transformations of Stress and Strain

Finding Principal Planes and Stress Limits

Description

Principal planes and principal stresses are found by analyzing two planes that meet at right angles under shearing, tensile, and compressive stresses. The goal is to use the given stress values to describe how the material is loaded and to locate the planes where the stress state changes.

To find...

Transcript

两个相互垂直的平面同时承受剪切应力以及拉应力和压应力。在已知应力值的情况下,确定主平面、最大剪切应力以及主应力。

主平面由以下关系确定:主平面等于剪切应力的两倍与拉伸应力和压缩应力之差的比值。

将已知的剪应力、正应力和压应力值代入方程,以计算主平面值。

然后通过计算拉伸和压缩正应力的平均值来确定平均正应力。

接下来,将正应力和切应力的数值代入公式,计算最大切应力。

通过将平均正应力值与最大剪应力相加,计算主应力中的最大主应力。

平均正应力值与最大剪应力之差即为最小主应力。