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Title: You want to examine the possibility of using a polymeric material as an artificial load bearing ... Post by: tabikaa1 on Jan 29, 2018 You want to examine the possibility of using a polymeric material as an artificial load
bearing surface for articulating joints. But the deformation of this material under loading is a concern. You have been informed that if the material has a Poissons ratio under 0.1, then it can undergo further testing for this application. You are given a cylindrical sample that is 10 mm in diameter and 3 mm in height. During compression testing, you apply a strain of 20 in the axial direction, and the diameter of the cylindrical sample increases by 0.4 mm at its widest point. What is the Poissons ratio of the sample? Does it pass or fail the screening test? What will be an ideal response? Title: You want to examine the possibility of using a polymeric material as an artificial load bearing ... Post by: san205 on Jan 29, 2018 Answer: t = d / d0 t = 0.4 mm / 10 mm = 0.04
a = - 0.2 (Negative due to the fact that the sample is in compression, see p. 136-137 in the book) = - t / a = - (0.04 / - 0.2) = 0.2 Since 0.2 > 0.1, the material cannot undergo further testing. |