Accession Number:

ADA076513

Title:

Pooled Estimations of the Parameters on Weibull Distributions.

Descriptive Note:

Final rept. 15 Jan-30 Jun 79,

Corporate Author:

AIR FORCE MATERIALS LAB WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Park,Won J.

Report Date:

1979-08-01

Pagination or Media Count:

48.0

Abstract:

In composite materials fatigue life testing under different levels of stress, the underlying distributions are assumed to be the Weibull Distribution with the common shape parameter. The problems of estimations and testing hypotheses regarding the common shape parameter and scale parameters in the Weibull distributions are considered. The results are three methods of pooled estimation of the shape parameter, exact confidence intervals and testing hypotheses for the shape parameter, comparison of the bias factor of three pooled estimators of the shape parameter and exact confidence intervals and testing hypotheses for the scale parameters. Examples are given for composite material applications.

Descriptors:

• *WEIBULL DENSITY FUNCTIONS
• *COMPOSITE MATERIALS
• PARAMETRIC ANALYSIS
• FATIGUE LIFE
• PARAMETERS
• STRESS TESTING
• CONFIDENCE LIMITS
• THEOREMS

Subject Categories:

• Laminates and Composite Materials
• Statistics and Probability

Distribution Statement:

APPROVED FOR PUBLIC RELEASE