A Photoelastic Investigation of Stresses and Load Distributions in Lug-Groove Joints,
Abstract
A photoelastic investigation has been made on lug-groove joints frequently found in weapon systems. Two profiles were studied: the British standard buttress (BSB) and the proposed profile with a longer fillet radius. The objectives were to determine the critical stress and load distribution, and to compare the results from both profiles. It was found that for joints made of the same material under axial tension, the first groove is the critical region, and the maximum fillet stress at the first groove is the critical stress. In a seven-groove joint, the first two lugs take 50 percent and 60 percent of the load in the BSB and proposed profile, respectively. The proposed profile is weaker than the BSB profile under tension. Moreover, due to allowable machining tolerances, ideal simultaneous contacts in all lug-groove pairs do not occur. The worst possible case would happen when only one pair is in contact and the joint is reduced to a single-groove type. Further work is in progress. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1982
- Accession Number
- ADP000023
Entities
People
- Yi Cheng
Organizations
- United States Army Armament Research, Development and Engineering Center