Question

Given: A bracket is made of material with Su-64 ksi and S. - 26.3 ksi. The bracket is! subjected to fluctuating loading which results in the following stress and shear conditions: - 4870 psi - 2922 psi 1998 psi 1198 psi Find: 2) Use Mohr's circle to find the principle mean stresses and principle alternating stresses b) Calculate the von Mises stresses and ! c) Draw a plot of alternating stress vs. mean stress and Illustrate the Goodman line d) Add a data point for your calculated von Mises stresses and calculate the factor of safety for fatigue relative to the Goodman line.

Answer 1

Ouven Data von-mises stresses are as follers Sut= 64 ksi se- 26.3ksi 1 omla (63-02)+(62-03+0--337 mean – 48 70 psi, o alt=-2922 Psi mean 1998 Psi, realt = 1198 Psi - 714-26 +5504 a +(55046) 47197 comean, tremean) = 5974.357 PST © 29 (o mean, -remean) Grood man line Set (26300250) Principle stresses are calculated as follows! syt sut om (64000 PSO) T 1,02 (mean principle stresses) o load point = = mean to + pancange + remeen – – 2435 & 3.149.00 similarly, and +01=714.20, 023-5504.8 (in Biod 163-045+(64-0) + (0-0339 alternating principlestenes) = ((920.37 +3350 377 + 13350 37) ²4 (422-3777 - 2 - valt alty? (Kalt)? I – 3583. di Psi = -2922 +112923)2+11992 a for factor of safety 53,04 (alternating brin 2 2 wa9.37 --1461 1889.37 420.37, og 2-3350.37 (in Bill - In - 4.355 required factor of safety