JSM 2005 Online Program

Abstract #303646

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:	330
Type:	Contributed
Date/Time:	Tuesday, August 9, 2005 : 2:00 PM to 3:50 PM
Sponsor:	Section on Physical and Engineering Sciences
Abstract - #303646
Title:	A Predictive Model for Tensile Strength of Alloy 7075-T6 after Retrogression and Re-aging
Author(s):	Gerald Shaughnessy*+
Companies:	University of Dayton
Address:	Department of Mathematics, Dayton, OH, 45469, United States
Keywords:	Model ; RRA ; tensile strength
Abstract:	Because of its low density and high strength, aluminum alloy 7075-T6 has been used extensively for all sorts of aerospace structural components. Unfortunately, this high-strength aluminum alloy is susceptible to corrosion-induced damage, including pitting, stress corrosion cracking (SCC), and exfoliation. A heat treatment technique, known as Retrogression and Re-aging (RRA), has been shown to increase 7075-T6's corrosion resistance. For an in-situ application of RRA, it would not be possible after RRA to measure tensile strength directly. The purpose of this study is to develop a predictive model for tensile strength using conductivity and hardness measurements. Conductivity and hardness can be measured in-situ. As different RRA times and temperatures were used, a model was developed to predict the post RRA percentage change in UTS (Percent Delta UTS) from the observed changes in conductivity (Delta CON) and hardness (Delta HRB).

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