Engineering Materials
Bronze contains

85 - 92% copper and rest tin with little lead and nickel
70 - 75% copper and rest tin
70% copper and 30% zinc
90% copper and 10% tin

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Engineering Materials
Stress relaxation is the phenomenon

In which parts are not loaded
In which deformation tends to loosen the joint and produces a stress reduced
Stress reduces on increasing load
In which stress remains constant on increasing load

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