Secure tightening of a CMC fastener for the heat shield of re-entry vehicles

被引：46

作者：

Boehrk, H. ^{[1
]}

Beyermann, U. ^{[1
]}

机构：

[1] DLR, Inst Struct & Design, German Res Ctr, Deutsch Zentrum Luft & Raumfahrt, D-70569 Stuttgart, Germany

来源：

COMPOSITE STRUCTURES | 2010年 / 92卷 / 01期

关键词：

CMC; Ceramic; Fastener; Re-entry; Heat-shield;

D O I：

10.1016/j.compstruct.2009.07.002

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The results of static and hot tests of ceramic matrix composite fasteners for heat shield attachment to a re-entry vehicle are presented. Herein, the effect of the high temperature cycle occurring during atmospheric re-entry on the reduction of the tightening torque of the CMC fasteners is investigated. From cold testing, it is found that the Young's modulus of the material decreases with first-time loading and, therefore, previous loading of the fasteners before their application is recommended. In hot testing of a fully integrated fastener connection, the material temperatures within the connection are experimentally simulated. It is shown that with previous straining, a significant improvement of the fastener is achieved. The loosening torque is no longer reduced by thermally induced stretching of the fastener. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：107 / 112

页数：6