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发表于 2009-2-18 08:55:53
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来自 韩国
AMPLITUDE
This parameter defines the default amplitude variation for loading magnitudes during the step.
Set AMPLITUDE=STEP if the load is to be applied instantaneously at the start of the step and remain constant throughout the step.
Set AMPLITUDE=RAMP if the load magnitude is to vary linearly over the step, from the value at the end of the previous step (or zero, at the start of the analysis) to the value given on the loading option.
If this parameter is omitted, the default amplitude choice depends on the procedure chosen, as shown in “Procedures: overview,” Section 6.1.1 of the Abaqus Analysis User's Manual. The default amplitude variation can be overwritten for individual loadings by using the AMPLITUDE parameter on the loading options (“Amplitude curves,” Section 28.1.2 of the Abaqus Analysis User's Manual).
This parameter is rarely needed, and changing the defaults may cause problems. For example, the automatic load incrementation scheme in procedures without a real time scale (such as the *STATIC option) applies the loads gradually by incrementing the normalized time scale. The use of AMPLITUDE=STEP specifies that the entire load will be applied immediately, so Abaqus/Standard may not be able to choose suitable small increments if the loading causes strongly nonlinear response. |
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