COMPUTE THE STRAIN-RATE FROM EFFECTIVE PLASTIC STRAIN VS TIME CURVES¶
Computes the strain rate from effective plastic strain vs. time curves (or related time-history quantities such as displacement or velocity). Accepts multiple input curves and supports a variety of rate-calculation strategies including total average, regional averages, and value-at-threshold methods.
When to use¶
Classification: process.
Tagged: curve_derivative, material_testing, plastic_strain, rate_calculation, strain_rate, time_history, uniaxial.
Inputs¶
| Label | ID | Type | Default | Required | Description |
|---|---|---|---|---|---|
| Time History Curves | time_history | vector | — | ✓ | One or more time-history curves (e.g. effective plastic strain vs. time, displacement vs. time, or velocity vs. time) from which the strain rate will be derived; supply as a vector or collection of vectors. |
| Timehistory Input Type | input_type | list | any | ✓ | Declares the physical meaning of the supplied curves — choose ‘any’ for a generic quantity whose rate is needed, ‘velocity’ or ‘displacement’ for kinematics, or ‘rate’ if the curves already represent a rate quantity; defaults to ‘any’. |
| Rate Calculation Type | rate_type | scalar | total | ✓ | Selects the rate-calculation strategy: ‘total’ averages over the full duration, ‘start’/’end’ evaluate at curve endpoints, ‘failure_time’ and ‘start_to_failure_time_average’ use a specific x-value threshold, ‘failure_value’ locates a target y-value, and ‘3r*’/‘5r*’ options average over equal sub-regions of the curve; defaults to ‘total’. |
| Value based on Strain-rate type specified above | rate_type_value | scalar | — | Threshold value used by rate-calculation methods that require a reference point — e.g. the specific x-value (time) for ‘failure_time’ or the y-value for ‘failure_value’; leave blank when using ‘total’, ‘start’, ‘end’, or regional strategies. | |
| Reference Length | ref_length | scalar | 27.5 | If the input type is velocity or displacement, the reference length is used to compute the rate | |
| Time Scale-factor | time_sf | scalar | 1.0 | Scale factor applied to the time axis before rate computation, enabling unit conversion (e.g. ms → s: set to 0.001); defaults to 1.0 (no scaling). |
Outputs¶
| Label | ID | Type | Description |
|---|---|---|---|
| Strain-Rates | strain_rate | keyvalue | Key-value map of computed strain-rate scalars (units: 1/time unit of the input curves after time_sf is applied), one entry per input curve, keyed by curve identifier. |
Disciplines¶
- data.curve.transform
- data.signal_processing
- engineering.material.characterization
- engineering.material.specimen
Runnable example¶
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