# Amplitude Curves

 An amplitude curve: allows arbitrary time (or frequency) variations of load, displacement, and other prescribed variables to be given throughout a step (using step time) or throughout the analysis (using total time); can be defined as a mathematical function (such as a sinusoidal variation), as a series of values at points in time (such as a digitized acceleration-time record from an earthquake), as a user-customized definition via user subroutines, or, in Abaqus/Standard, as values calculated based on a solution-dependent variable (such as the maximum creep strain rate in a superplastic forming problem); and can be referred to by name by any number of boundary conditions, loads, and predefined fields. The following topics are discussed:
 Related Topics About Prescribed Conditions In Other Guides *AMPLITUDE The Amplitude toolset

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