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Engineering
Mechanical Engineering
What is bending moment? Is it a moment couple? Why?
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[QUOTE="Chestermiller, post: 6822128, member: 345636"] It's not a couple. In the "Strength of Materials" approach to beam bending, we assume that all cross sections of the beam remain flat, and that the axial component of strain is proportional to the distance above or below the "neutral axis" within the beam. So the axial stress is zero at the neutral axis, and for downward bending, the axial strain and stress are in tension above the neutral axis and in compression below the neutral axis. The bending moment at a given cross section of the beam is equal to the integral over the cross section of the axial stress times the distance from the neutral axis. This can be replaced by a couple, but is certainly not fundamentally a couple. [/QUOTE]
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Mechanical Engineering
What is bending moment? Is it a moment couple? Why?
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