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Reliability Assessment Method of Device Under Incomplete Observation of Failure

This paper presents reliability assessment with incomplete service data on the example of impact wrenches. The significance and rules for determining reliability are presented. Examples of tool destruction during extreme operating conditions and during improper use are presented. The authors propose a model of reliability and described typical distributions. Then, an example of a test to evaluate reliability of a fully functional tool was presented. Finally, the analysis of the reliability of a wrench and its elements was presented.