Give the following stress-strain behavior of three differential materials, which

Question

Give the following stress-strain behavior of three differential materials, which one is the toughest material? Material A Material B Material C Which one of the following is the hardest? Coarse pearlite Bainite Fine perlite Martensite Which one of the following is NOT the method to strengthen the metal? Form alloys Form solid solutions Enlarge the grain sizes Use cold working process What is the percent cold work (%CW) of a cylindrical copper rod when its diameter is reduced from 10 mm to 8 mm? 20% 36% 55% 64% True/False: Critical resolved shear stress is a material property. True/False: We should keep safety factor low for a safer design.

Explanation / Answer

1) from the given stress vs strain graph it is cleaarly evident that, material A shows a very little deformation with respect to the other two material even at higher stress is applied. Thus, material A is the toughest material that resist a higher magnitude of stress relative to other.

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