GAMMA AND WEIBULL LIFE-QUALITY PLOTS,
Abstract
The life quality of an industrial product can be characterized by its lifelength distribution. Given 'Good' failure data, the simplest way to estimate the life-length distribution is by the probability plot. This paper presents two such plots: gamma and Weibull (Form 2) probability plots which represent two theories of failures. The gamma distribution arises from the rope (or parallel-structure) failure model while the Weibull distribution comes from the chain (or series-structured) failure model. In rope model, the item fails when the last or the strongest strand of the rope fails whereas in the chain model, the item fails when the first or the weakest link of the chain fails. Scales which facilitate quick estimates for the mean and standard deviation of the lifelength distribution are also presented along with the plots. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 15, 1968
- Accession Number
- AD0690876
Entities
People
- John H. K. Kao
Organizations
- New York University