NASA-LLIS-0080

Lessons Learned - SRB Holddown Stud Detensioning Operation

contributor author	NASA - National Aeronautics and Space Administration (NASA)
date accessioned	2017-09-04T16:38:38Z
date available	2017-09-04T16:38:38Z
date copyright	05/22/1992
date issued	1992
identifier other	VIYCQCAAAAAAAAAA.pdf
identifier uri	https://yse.yabesh.ir/std/handle/yse/102238
description abstract	Description of Driving Event: During detensioning operations of a holddown post, while pressure of approximately 8K to 10K lbs was being applied, a loud "bang" was heard. Pressure on the tensioner fell to zero. It was later determined that the loud "bang" was the result of thread failure between the puller bar socket and the SRB holddown stud. With only 8 threads engaged, the shear stresses increased to 96,000 psi, as compared to 98,000 psi shear strength of the stud. Examination of the holddown stud revealed that 8 threads sheared on a 135 degree circumferential segment of the holddown stud.
language	English
title	NASA-LLIS-0080	num
title	Lessons Learned - SRB Holddown Stud Detensioning Operation	en
type	standard
page	2
status	Active
tree	NASA - National Aeronautics and Space Administration (NASA):;1992
contenttype	fulltext
subject keywords	Hardware
subject keywords	Launch Process
subject keywords	Launch Vehicle
subject keywords	Packaging Handling Storage
subject keywords	Parts Materials & Processes