Mechanics of Materials Problem: 1-57

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Question: The specimen failed in a tension test at an angle of 52° when the
axial load was 19.80 kip. If the diameter of the specimen is 0.5 in.,
determine the average normal and average shear stress acting on
the area of the inclined failure plane. Also, what is the average
normal stress acting on the cross-section when failure occurs?

Chapter 1 Problem 1-57

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why is reason because you divide the area for sen52?

castillolevarioemanuel
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why is it pi/4? wouldn't it just be pi for area?

noahg