국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Hypervelocity Impact of Unstressed and Stressed Titanium in a Whipple Configuration in Support of the Orion Crew Exploration Vehicle Service Module Propellant Tanks
저자	Nahra, Henry K.;; Christiansen, Eric;; Piekutowski, Andrew;; Lyons, Frankel;; Keddy, Christopher;; Salem, Jonathan;; Miller, Joshua;; Bohl, William;; Poormon, Kevin;; Greene, Nathanel;; Rodriquez, Karen
Keyword	CREW EXPLORATION VEHICLE;; FABRICATION;; HARDNESS;; HYPERVELOCITY IMPACT;; INTERNATIONAL SPACE STATION;; METALLOGRAPHY;; MICROMECHANICS;; PROPELLANT TANKS;; RESIDUAL STRENGTH;; RESIDUAL STRESS;; SCANNING ELECTRON MICROSCOPY;; SERVICE MODULES;; SPACECRAFT CONFIGURATIONS;; TENSILE PROPERTIES;; TENSILE TESTS;; TITANIUM
URL	http://hdl.handle.net/2060/20100040567
보고서번호	NASA/TM-2010-216804
발행년도	2010
출처	NTRS (NASA Technical Report Server)
ABSTRACT	Hypervelocity impacts were performed on six unstressed and six stressed titanium coupons with aluminium shielding in order to assess the effects of the partial penetration damage on the post impact micromechanical properties of titanium and on the residual strength after impact. This work is performed in support of the definition of the penetration criteria of the propellant tanks surfaces for the service module of the crew exploration vehicle where such a criterion is based on testing and analyses rather than on historical precedence. The objective of this work is to assess the effects of applied biaxial stress on the damage dynamics and morphology. The crater statistics revealed minute differences between stressed and unstressed coupon damage. The post impact residual stress analyses showed that the titanium strength properties were generally unchanged for the unstressed coupons when compared with undamaged titanium. However, high localized strains were shown near the craters during the tensile tests.