<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>47</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Tidd, W F</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">1888. Minimum Weight High Tempterature Joint Design for Reentry Vehicles</style></title><secondary-title><style face="normal" font="default" size="100%">48th Annual Conference, Alexandria, Virginia, May 22-24</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">22. Weight Engineering - Structural Design</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1989</style></year><pub-dates><date><style  face="normal" font="default" size="100%">5/22/89</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sawe.org/store/product_info.php?products_id=43855</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">Society of Allied Weight Engineers, Inc.</style></publisher><pub-location><style face="normal" font="default" size="100%">Alexandria, Virginia</style></pub-location><pages><style face="normal" font="default" size="100%">29</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">High temperature joint design is a subject which has been receiving increased attention as a result of the ongoing national effort to advance hypersonic and materials technologies.  Current fastener technology is sufficient for temperatures below 1600' F, but the development of advanced carbon/carbon (ACC) has created a need for a robust fastening system which can maintain reasonable strength up to temperatures of 3000' F. High temperature fastener data is limited, and there is a significant need for additional research and development The objective of this paper is to provide directional input to this future work in the form of minimum weight carbon-carbon splice joint design estimates for a given range of load and temperature conditions.  The data presented in this paper is based on an analytical model of a single shear C/C splice joint which was evaluated for running loads ranging from 200-4000 lb/in and temperatures ranging from 78-3000' F. Minimum weight designs were identified at finite intervals within these ranges through an iterative optimization of the major design variables: fastener material, fastener spacing, fastener diameter, panel thickness, and the number of fastener rows.  Sixteen different fastener materials were evaluated in the optimization including among others: T-222 tantalum, C129Y columbium, TZM, carbon/carbon, and tungsten hafnium carbide.  The results of this analysis indicate that for joint loads of less than 1000 lb/in and temperatures greater than 1800' F, the minimum weight design includes C/C as the fastener material.  Joints with loads greater than 1000 lb/in and temperatures between 1800 and 2200' F should be designed using T-222 tantalum or TZM.  Tungsten hafnium carbide yields the minimum weight design for joints with loads greater than I 000 lb/in and temperatures greater than 2200' R.  The subject of high temperature carbon-carbon joint design includes many issues, of which weight is only one.  Oxidation protection, thermal expansion, and a variety of other material and design problems must be considered in the development of a robust high temperature fastening system for carbon/carbon.  This paper represents an effort to quantify the weight impacts of various design decisions, and thereby provide input to the future testing and development of high temperature fastener materials.</style></abstract><work-type><style face="normal" font="default" size="100%">22. WEIGHT ENGINEERING - STRUCTURAL DESIGN</style></work-type><accession-num><style face="normal" font="default" size="100%">1888</style></accession-num><custom1><style face="normal" font="default" size="100%">Non-Member Price: $18.27. Members may download this paper for free. &lt;a href=&quot;http://www.sawe.org/dms&quot;&gt;Click here&lt;/a&gt;. (Login Required. See SAWE &lt;a href=&quot;http://www.sawe.org/faq&quot;&gt;Frequently Asked Questions&lt;/a&gt;.)</style></custom1><custom3><style face="normal" font="default" size="100%">18.27</style></custom3></record></records></xml>