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pure bending
Pure bending is a condition of stress where a bending moment is applied to a beam without the simultaneous presence of axial, shear, or torsional forces.
Pure bending occurs only under a constant bending moment (M) since the shear force (V), which is equal to , has to be equal to zero. In reality, this state of pure bending does not practically exist, because such a state needs an absolutely weightless member. The state of pure bending is an approximation made to derive formulas.
==Kinematics of pure bending==
#In pure bending the axial lines bend to form circumferential lines and transverse lines remain straight and become radial lines.
#Axial lines that do not extend or contract form a neutral surface.〔http://emweb.unl.edu/negahban/em325/11-Bending/Bending.htm〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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