MAE 415 HW4

MAE 415 HW4 - stress One of the best sources is

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MAE 415 HW# 4 Contact Stress Calculate the contact stress due to gravity loading between a: 1. 25.4 mm diameter steel ball and a glass flat 2. 25.4 mm alumina (Al 2 O 3 ) ball and a flat glass sample. The glass is BK7 which is mostly SiO 2 . Indicate the load, the radius of the contact region and the stress in Pa and psi. Compare the stress to the yield stress for the materials above. To solve this problem, you will need to find density, Poisson ratio, elastic modulus and the yield
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Unformatted text preview: stress. One of the best sources is The mating materials are not the same so the simple equation will not work. Also remember that Poissons ratio involves relative deflection of a material in the directions perpendicular to the applied force. It has to be 0.5 for volume to be conserved but for most metals it is on the order of 0.3. Glasses can be different....
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