2 A 45 0 S Graphite Reinforced Plate Is Subjected To A Biaxial Loading Such That The Stress Resultant In The Y Direc 1 (136.67 KiB) Viewed 31 times
2. A [+45/0₂]s graphite-reinforced plate is subjected to a biaxial loading such that the stress resultant in the y direction is opposite in sign to and one-half the magnitude of the stress resultant in the x direction. Call the stress resultant in the x direction N; the loading is given by Nx = N Ny = -0.5N Nxy = 0 (a) Using the maximum stress criterion, compute the value of N to cause failure. (b) What layer or layers control failure? (c) What is the mode of failure? To answer these questions, compute the failure loads for each of the layers by using the procedure just discussed in connection with the axially loaded tube. Put the results in table form, as in Table 9.6, and answer the questions.
+20° -20° FIGURE 9.8 Tube with axial load P, Failure Example 1 H = 1.50 mm P R = 25.0 mm
TABLE 9.6 Summary of loads P (MN) to cause failure in [±20/03]s tube: Maximum stress criterion Failure mode Layer of of - 11/2 +20° -0.327 +0.392 +0.673 -0.673 -20° -0.327 +0.392 -0.673 +0.673 0° -0.262 +0.315 +00 of +1.780 +1.780 +1.186 of -0.445 -0.445 -0.297
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