Author:
Kolpakov Alexander G.,Rakin Sergei I.
Abstract
In this paper, the local stress–strain state in an explosion weld was investigated and the local strength of the welded materials near the weld analyzed. It follows from the experimental data that the explosion weld at the microlevel looks like a wavy line. In the first approximation, this wavy line may be assumed to be periodic. We used the two-scale method to analyze the corresponding interface elasticity problem. We carried out numerical computations for three of the most referenced types of weld geometry: the symmetric wave, the asymmetric wave, and the wave with crest. We found that the wave geometry of the weld leads to increase in local stress in the weld zone. The stress concentration varied from 20% to 200% in dependence on the weld geometry and the macroscopic loading. Explosion welding is accompanied by strain hardening of the materials in the welding zone. In some cases, the strain hardening may compensate for the increasing local stress. As a result, the weld may be both stronger and weaker than the welded materials.
Subject
General Materials Science
Reference47 articles.
1. Brass welds made by detonation impulse;Metal Progr.,1944
2. Limiting conditions for jet formation in high velocity collisions;J. Appl. Phys.,1953
3. An effect produced by oblique impact of a cylinder on a thin target;J. Appl. Phys.,1954
4. Pearson, J. (1959, January 3). Recent Advances in Explosive Pressing and Welding. Proceedings of the 2nd Metals Energy Conference of Explosive, Chicago, IL, USA.
5. Metal working with explosives;JOM,1960