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How can I generate a life data model for a nondestructive degradation data set?



The degradation analysis folio in Weibull++ enables you to use the performance measures of a product over time to predict the point at which each unit in the sample is expected to fail. For a nondestructive data set, because the measurements do not affect the product (e.g., measuring the depth of a tire's tread), it is possible to take multiple measurements over time, and thus predict when the tire will fail.

You can then use that data in two ways.

Publish a Model Directly from the Data Sheet

You can publish a model directly from the degradation data sheet by using the Life Data Model area of the control panel to define the settings for performing life data analysis on the extrapolated failure times.

Degradation analysis control panel

If you want to extrapolate the failure/suspension times as interval censored data, select the Use extrapolated intervals check box; otherwise the extrapolated data will be specific times.

You can then publish that model so that it is available to use in other analyses (e.g., a BlockSim diagram or an FMEA in Xfmea).

Perform Further Analysis on the Extrapolated Data

If you wish to work directly with the extrapolated failure times, choose Degradation > Transfer Life Data > Transfer Life Data to New Folio.


This creates a new life data folio and data set. You can then use that folio to perform further manipulations of the data.

For example, from the data in this degradation data set:

Degradation analysis data sheet

You can generate this life data set:

Life data analysis data sheet

Additionally, the life data analysis folio allows you to insert extra data sheets, add general spreadsheets for further analysis of the data, etc.