Recovering Stress on Preloaded Flexible Bodies

For a preloaded flexible body, equation (10) becomes:

where:

is the prestress state due to preload. This vector also needs to be computed by the FE code and stored in the MNF for the flexible component to perform MSR on proloaded flexible bodies in Adams. Note that this vector could represent a nonlinear stress state of the flexible component since the preload could have taken on a nonlinear load path.

Similarly, recovering strain on a preloaded flexible body becomes:

where:

is the prestrain state of the flexible body due to preload.

Note that when exporting modal coordinates to a fatigue program, such as MSC.Fatigue, Adams Durability outputs one more DAC file or RPC file channel than the number of modes for a preloaded flexible body. This additional file or load channel equals a constant value of one (1.0), representing the DC component or static offset of the pre-stress or pre-strain. This file or channel should be mapped to the result set of the preload case from the FE code.