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Method and device for predicting a life expectancy of a product containing a plurality of components

  • US 7,831,396 B2
  • Filed: 11/25/2005
  • Issued: 11/09/2010
  • Est. Priority Date: 12/16/2004
  • Status: Expired due to Fees
First Claim
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1. A method for predicting a life expectancy of a product, having at least two components, as a function of a predefined loading of the product, comprising:

  • acting upon the components of the product by different loadings;

    operating each component at the different loadings until failure;

    storing obtained failure times for each component as a function of each of the loadings;

    recording a corresponding end-of-life (EOL) curve of each component as a function of the load-dependent failure times of the component;

    ascertaining an EOL curve of the product, so that at each of the different loadings, it includes the EOL curve of a component which has a shortest failure time at the corresponding loading; and

    determining an anticipated service life of the product as a functional value of the EOL curve of the product as a function of the predefined loading of the product;

    wherein the components of the product are loaded by at least one of (a) a specific, absolute operating temperature and (b) a temperature fluctuation of a particular amplitude within a specific period of time, andwherein the different loadings are in a number of loading classes, and for each loading class a distance of a duration of a predefined loading of a component to a corresponding value on the EOL curve of the component is determined and summed up according to Palmgren-Miner.

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