This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Cohesion of Copper and Steel Repeatedly Fractured and Rejoined in Vacuum
*
Annotation ability available
Sector:
Language:
English
Abstract
The cohesion of copper and soft steel repeatedly ruptured and rejoined in vacuum at room temperature initially decreases with each successive fracture-rejoin cycle even when exposure is too low to permit formation of a monolayer of gas on the fractured surfaces and even when the joining stress is too low to cause measurable plastic strain.
At 500 C the cohesive stress for steel is nearly constant for at least four cycles with time in contact ranging from 1–6 minutes. For copper at 400 C cohesion was only 70% after 2 hr in contact on the first cycle due to excessive exposure but was time dependent and reached 75% in 12 hr.
Comparison of the results with published data on roll cladding indicates that less deformation is required for good bonding if surfaces are not exposed to air after fracturing or wire brushing.
Authors
Citation
Ham, J., "Cohesion of Copper and Steel Repeatedly Fractured and Rejoined in VacuumAlso In
References
- Frankel H. E. “A Critical Appraisal of Materials Testing.” National Symposium on the Effects of Space Environment on Materials St. Louis July 8–9 1962
- Bowden F. P. Rowe G. W. “The Adhesion of Clean Metals,” Proceedings Royal Society of London, Ser. A 233 January 1956 429
- Gwathmey A. T. Dyer Lawrence D. “Cohesion Between Two Oriented Single Crystals of Copper.” Proceedings of Symposium on Friction and Wear Detroit 1957 Amsterdam Elsevier Publishing Co 1959 165 182
- Holden, F. C. et al “Formation and Initial Growth of Single-Asperity Solid-State Bonds.” J. Appl. Phys. 31 4 April 1960 670
- Vaidyanath L. R. Milner D. R. “Significance of Surface Preparation in Cold Pressure Welding.” British Welding Journal January 1960
- 1958
- Ham John L. “Mechanisms of Surface Removal from Metals in Space.” Aerospace Eng 20 5 1961 20
- Schwartzbart H. Brown W. F. “Notch Bar Tensile Properties of Various Materials and Their Relation to the Unnotch Flow Curve and Notch Sharpness.” Trans. A.S.M. 46 1954 998
- Ham John L. “Metallic Cohesion in High Vacuum.” Joint ASLE/ASME Lubrication Conference Pittsburgh, Pa October 16 1962
- Nicholas M. G. Milner D. R. “Pressure Welding by Rolling at Elevated Temperatures.” British Welding Journal 8 8 August 1961 375