The proof stress of a material of 3 inches gage length is the highest stress it can withstand without a permanent set of above ___________ inch.

The proof stress of a material of 3 inches gage length is the highest stress it can withstand without a permanent set of above ___________ inch. Correct Answer 0.0003

For a length of one inch, the permanent set of over 0.0001 inch withstanding is proof stress. For 3 inches length, it will be – 0.0001×3 = 0.0003 inches. Hence, it is 0.0003 inches.

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