Unformatted text preview: . Assume that the mass
of the box is large compared to that of the enclosed mass m and that the box remains in contact with the floor
after impact. Figure 81.1 Drop Container Problem Sketch Material Properties
m = 0.5 lb-sec2/in
k = 1973.92 lb/in Geometric Properties
h = 1 in Loading
g = 386 in/sec2 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–183 VM81 Analysis Assumptions and Modeling Notes
The node locations are arbitrarily selected. The final time of 0.11 sec allows the mass to reach its largest deflection.
The integration time step (0.11/110 = 0.001 sec) is based on ≈ 1/100 of the period (during impact), to allow the
initial step acceleration change to be followed reasonably well, and to produce sufficient printout for the theoretical comparison.
The problem is solved first using the full method in a nonlinear transient dynamic analysis and then using the
reduced transient dynamic analysis. The COMBIN40 gap cannot be used in a reduced transient dynamic analysis
and is replaced by a mass and a gap condition. One ma...
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