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NASA-LLIS-0080
Lessons Learned - SRB Holddown Stud Detensioning Operation
Year: 1992
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.
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.
Subject: Hardware
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| 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 |