Accession Number : ADP000023

Title :   A Photoelastic Investigation of Stresses and Load Distributions in Lug-Groove Joints,

Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB

Personal Author(s) : Cheng,Y. F.

Report Date : SEP 1982

Pagination or Media Count : 17

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)

Descriptors :   *Joints, *Metal joints, *Tensile stress, *Failure(Mechanics), *Loads(Forces), Photoelasticity, Mathematical models, Brittleness, Machining, Kinetic energy, Shear properties, Heat treatment, Stress concentration, Radial stress, Graphs, Equations, Factor analysis

Distribution Statement : APPROVED FOR PUBLIC RELEASE