Related Topics and Links:

 ReliaWiki: Degradation Data Analysis

Degradation Analysis Folio

Degradation analysis is a technique that uses the performance (degradation) measurements of a product over time to predict the point at which each unit in the sample is expected to fail. This analysis is useful for tests performed on products with very high reliability, where it is not possible to test the units to failure under normal conditions.

Weibull++/ALTA offers two types of degradation analysis folios:

The ReliaWiki resources portal has more information on degradation analysis at: http://www.reliawiki.org/index.php/Degradation_Data_Analysis.

Degradation Analysis Folio Setup

To add a degradation analysis folio, choose Home > Insert > Degradation, or right-click the Degradation folder in the current project explorer and choose Add Degradation on the shortcut menu.

In the setup window, select the type of degradation analysis folio to create. If you have a Weibull++/ALTA license on your computer, all four options will be available. The ALTA degradation analysis folios are similar to Weibull++'s except that accelerated stress levels are used during testing to further reduce the test time required to obtain the predicted failure times.

Weibull++

  Nondestructive Degradation

  Destructive Degradation

ALTA

  Accelerated Nondestructive Degradation

  Accelerated Destructive Degradation

Degradation Folio Data Sheet

In a degradation analysis folio data sheet:

The following example shows a Weibull++ nondestructive degradation analysis for two automobile tires, A and B. The inspection time is in mileage because of its direct relation to the wear on the tires.

 

The following example shows an ALTA accelerated nondestructive degradation analysis for two LED units, A1 and A2. The light intensity is inspected every 50 hours and measured in milliamperes.

Control Panel Settings

The degradation folio control panel contains most of the tools you need to perform a degradation analysis. For more information about control panels in general, see Control Panels.

Tip: If you are not certain which degradation model would provide the best fit for your data, you can use the Degradation Model Wizard to guide you through the selection process.

Nondestructive Degradation

Note: If the distribution and parameters are associated with a published model, then the model's name will appear as a link at the bottom of the Life Data Results area. Click the link to view the model's properties. See Publishing Models.

Destructive Degradation

Folio Tools

The folio tools are arranged on the left side of the Main page of the control panel. Use these tools to manage data and experiment with the results of your analysis.

  Calculate analyzes the data set. This command is also available by choosing Degradation > Analysis > Calculate.

  Plot creates a new sheet in the folio that provides a choice of applicable plot types. This tool is also available by choosing Degradation > Analysis > Plot.

  QCP opens the Quick Calculation Pad, which allows you to calculate life data/life-stress data analysis metrics, identical to the calculations you can perform in a life data/life-stress data folio. This tool is also available by choosing Degradation > Analysis > QCP.

  Degradation Model Wizard opens the Degradation Model Wizard, which helps you select the degradation model that best fits your data. This tool is also available by choosing Degradation > Analysis > Model Wizard.

  Distribution Wizard opens the Distribution Wizard, which helps you select the distribution that best fits the data set. This tool is also available by choosing Degradation > Analysis > Distribution Wizard.

  Change Units opens the Change Units window, which allows you to change the units for the values in the current data sheet.

 

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