The integration time step size its 00001 sec is based

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Unformatted text preview: ce F1 suddenly applied to this end. Figure 84.1 Bar with Free Ends Problem Sketch Material Properties E = 30 x 106 psi γ = 0.278 lb/in3 ρ = γ / g = 0.0007202 lb-sec2/in4 Geometric Properties A = 2 in2 g = 386 in/sec2 = 4000 x 12 = 48,000 in Loading F1 = 6000 lb (see load history in Figure 84.1: “Bar with Free Ends Problem Sketch”) Analysis Assumptions and Modeling Notes A static solution is done at the first load step. The fundamental period of vibration (τ) is 0.47937 sec. The final time of 0.24 sec includes 1/2 of the fundamental period of vibration. All longitudinal master degrees of freedom (MDOF) are selected along the length of the bar. The integration time step (0.005 sec) is based on ≈ 1/10 of the ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–190 VM84 shortest period, to allow the initial step change in acceleration to be followed reasonably well, and to produce sufficient printout for the theoretical comparison. POST26 is used to extract resul...
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