Analysis of creep failure times of cured-in-place pipe rehabilitation liners
✍ Scribed by R Nassar; M Yousef
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 168 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0886-7798
No coin nor oath required. For personal study only.
✦ Synopsis
In experimental studies involving accelerated time until failure, each specimen is usually tested until failure or a given time t whichever occurs first. In analyzing such data, the conventional method used is least squares regression. The recommendation Ž . Ž . ASTM D2992 is to include non-failed observations censored data as failures in establishing the regression line. Such an approach could lead to a serious error in prediction. To remedy this situation, we recommend instead a maximum likelihood approach in which non-failed observations are incorporated as censored and not as failed observations in the analysis. We compare the two methods of analyses using data on accelerated time until buckling of cured-in-place plastic liners.