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Title: Test and analysis of canister-frame connections

Abstract

A finite element analysis was performed for the structural connections of a downhole nuclear test emplacement assembly. The bolt loads as well as the stresses in the cable trays and end plates of the assembly were examined for a range of bolt preloads and applied external axial loads. The focus of this study was the effects of preload on the bolt load and the stresses in various parts of the assembly. The effects of bolt size and door strap were also examined. A full-scale pull test of the structural connections was performed. The results of the test validated not only the finite element analysis but also the computer code NIKE3D used in the analysis.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
10192117
Report Number(s):
UCRL-ID-115135
ON: DE94001858; TRN: AHC29313%%6
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 31 Aug 1993
Country of Publication:
United States
Language:
English
Subject:
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE; MATERIALS HANDLING EQUIPMENT; BOLTED JOINTS; DESIGN; STRESS ANALYSIS; NUCLEAR WEAPONS; PERFORMANCE TESTING; FINITE ELEMENT METHOD; UNDERGROUND FACILITIES; STATIC LOADS; SIZE; DYNAMIC LOADS; N CODES; VALIDATION; STRESSES; EXPERIMENTAL DATA; 450200; NUCLEAR EXPLOSIONS AND EXPLOSIVES

Citation Formats

Lo, Ting-Yu, and Davito, A.M.. Test and analysis of canister-frame connections. United States: N. p., 1993. Web. doi:10.2172/10192117.
Lo, Ting-Yu, & Davito, A.M.. Test and analysis of canister-frame connections. United States. doi:10.2172/10192117.
Lo, Ting-Yu, and Davito, A.M.. Tue . "Test and analysis of canister-frame connections". United States. doi:10.2172/10192117. https://www.osti.gov/servlets/purl/10192117.
@article{osti_10192117,
title = {Test and analysis of canister-frame connections},
author = {Lo, Ting-Yu and Davito, A.M.},
abstractNote = {A finite element analysis was performed for the structural connections of a downhole nuclear test emplacement assembly. The bolt loads as well as the stresses in the cable trays and end plates of the assembly were examined for a range of bolt preloads and applied external axial loads. The focus of this study was the effects of preload on the bolt load and the stresses in various parts of the assembly. The effects of bolt size and door strap were also examined. A full-scale pull test of the structural connections was performed. The results of the test validated not only the finite element analysis but also the computer code NIKE3D used in the analysis.},
doi = {10.2172/10192117},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 31 00:00:00 EDT 1993},
month = {Tue Aug 31 00:00:00 EDT 1993}
}

Technical Report:

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  • The DWPF canister closure system uses resistance welding for sealing the canister nozzle and plug to ensure leak tightness. The welding group at SRTC is using the burst test to qualify this seal weld in lieu of the shear test in ASME B&PV Code, Section IX, paragraph QW-196. The burst test is considered simpler and more appropriate than the shear test for this application. Although the geometry, loading and boundary conditions are quite different in the two tests, structural analyses show similarity in the failure mode of the shear test in paragraph QW-196 and the burst test on the DWPFmore » canister nozzle Non-linear structural analyses are performed using finite element techniques to study the failure mode of the two tests. Actual test geometry and realistic stress strain data for the 304L stainless steel and the weld material are used in the analyses. The finite element models are loaded until failure strains are reached. The failure modes in both tests are shear at the failure points. Based on these observations, it is concluded that the use of a burst test in lieu of the shear test for qualifying the canister-plug weld is acceptable. The burst test analysis for the canister-plug also yields the burst pressures which compare favorably with the actual pressure found during burst tests. Thus, the analysis also provides an estimate of the safety margins in the design of these vessels.« less
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