Stiffness and Bending Introduction （刚度和弯曲的介绍）.pdfVIP

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2017-09-02 发布于浙江
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Stiffness and Bending Introduction （刚度和弯曲的介绍）.pdf

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Stiffness and Bending Introduction （刚度和弯曲的介绍）

Stiffness and Bending Youngs Modulus | Moments of Inertia | Bending Configurations | Evaluation Tools Introduction One very common problem that students have in 2.007 is not making their arm or structures stiff enough. This is a problem because the arms and structures usually need to move or support things. A lack of stiffness is very common cause of machine unreliability. Remember from 2.001 that the following factors need to be known to calculate the stiffness of something. The Youngs Modulus [E]: This is a material property that measures the stress/strain. The Cross-Sectional Inertia [I]: This is determined by the cross sectional geometry of the arm. The Loading Configuration: This gives your equation to calculate the the deflection. Typical configurations and their equations are listed below. Youngs Modulus Young Modulus Shear Modulus Poissons Material E G Ratio ksi GPa ksi GPa v Aluminum (pure) 10,000 70 3,800 26 0.33 Aluminum alloys 6061-T6 10,000 70 3,800 26 0.33 7075-T6 10,400 72 3,900 27 0.33 Steel 29,000 190-210 11,300 75-80 0.27-0.30 Delrin 3.1 0.35 Moments of Inertia Cross Section Inertia This is an approximation of a simple truss, ingoring the cross members. Both upper and lower members ha