JSM 2005 Online Program

Abstract #303972

This is the preliminary program for the 2005 Joint Statistical Meetings in Minneapolis, Minnesota. Currently included in this program is the "technical" program, schedule of invited, topic contributed, regular contributed and poster sessions; Continuing Education courses (August 7-10, 2005); and Committee and Business Meetings. This on-line program will be updated frequently to reflect the most current revisions.

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Activity Number:	128
Type:	Topic Contributed
Date/Time:	Monday, August 8, 2005 : 10:30 AM to 12:20 PM
Sponsor:	Section on Physical and Engineering Sciences
Abstract - #303972
Title:	Accelerated Destructive Degradation Test Planning
Author(s):	Luis Escobar*+ and William Q. Meeker
Companies:	Louisiana State University and Iowa State University
Address:	159 Ag Adm Bldg, Baton Rouge, LA, 70803, United States
Keywords:	non-linear-optimization ; Fisher Information ; destructive-test
Abstract:	Accelerated Destructive Degradation Tests (ADDT) are used to assess long-term strength of materials. Samples of units are tested at increased levels of stress. Units are removed from the experiment over time to be destructively evaluated. Then, a nonlinear regression model for strength is fit to the data and used to estimate a time to first-crossing (failure) distribution. An ADDT plan requires specification of the number of units to put at each stress and the time of evaluation for each unit. This talk describes methods for ADDT planning. We show how to use large sample approximations to obtain optimum test plans to provide insight for obtaining more useful compromise plans. Simulation allows fine-tuning of the plans and visualization of how the design affects statistical uncertainty. The methods are illustrated with an accelerated destructive degradation test for an adhesive bond.

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