Assume a viscous damping coefficient c figure 861

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Unformatted text preview: the speed of sound in the bar. /a, where Figure 85.1 Moving Bar Problem Sketch Material Properties E = 30 x 106 psi r = 0.00073 lb-sec2/in4 Geometric Properties = 10000 in A = 1 in2 so = 0.64 in Loading vo = 100 in/sec ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–193 VM85 Analysis Assumptions and Modeling Notes E/g The speed of sound in the bar is a = = 202,721 in/sec, hence time t1 = /a = 0.0493288 sec. A static solution is done at the first load step. The final time of 0.06 sec allows the bar to impact (at to = 0.0064 sec) and reach its maximum deflection (at t = to + t1). The gap stiffness (k = 30,000,000 lb/in) is arbitrarily selected high enough to minimize the elastic contact deformation but low enough to also allow a practical integration time step size. Seventeen longitudinal master degrees of freedom (MDOF) are selected along the length of the bar. The integration time step size (ITS = 0.0001 sec) is based on the shortest period (during contact) t...
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This note was uploaded on 12/09/2010 for the course DEPARTMENT E301 taught by Professor Kulasinghe during the Spring '09 term at University of Peradeniya.

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