Fatigue of Copper Alloys,
WATERTOWN ARSENAL MA
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Test specimens were exposed to the action of ammonia while under stress. Results have been obtained from the following alloys Manganese bronze, naval brass, Muntz metal and gun metal. All the specimens of these metals cracked when the stress reached a value between 20,000 and 27,000 lb. per sq.in. Specimens of manganese bronze, which were corroded without being under stress, were not injured thereby. The following conclusions have been drawn from the tests does corrosion alone, or corrosion accompanied by moderate stress. Corrosion, accompanied by moderate stress exceeding 20,000 lb. per sq. in., is liable to cause cracking in any of the above mentioned alloys. We must therefore regard 20,000 lb. per sq. in. as the practical ultimate strength of copper alloys, and the working stress must be taken as a safe fraction of this ultimate strength.
- Properties of Metals and Alloys