Only half the beam is modeled taking advantage of

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Unformatted text preview: o. The bolt material has a creep strain rate given by dε/dt = kσn. Determine the stress σ in the bolt at various times during creep relaxation. Figure 132.1 Tightened Bolt Problem Sketch Material Properties E = 30 x 106 psi n=7 k = 4.8 x 10-30/hr Geometric Properties Loading σo = 1000 psi To = 900°F t1 = 1000 hr = 10 in A = 1 in2 Analysis Assumptions and Modeling Notes An integration time step of 10 hours over the 1000 hour time range (i.e., 100 iterations) is used. The initial strain is calculated by σo/E = (1000 psi)/(30 x 106 psi) = 1/30000. Results Comparison Target ANSYS(1) Ratio Stress, psi @t = 190 hr 975. 976. 1.00 Stress, psi @t = 420 hr 950. 951. 1.00 Stress, psi @t = 690 hr 925. 926. 1.00 Stress, psi @t = 880 hr 910. 911. 1.00 Stress, psi @t = 950 hr 905. 905. 1.00 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–296 VM132 1. Stress (σ) corresponds to the quantity SIG in POST26 listing. ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–297 VM133: Motion of a Rod Due to Irr...
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