Why did full-scale engineering-material Stephanie Redfern @The Mechanics

Question 10 / 40: Why did full-scale engineering-material specimens fracture at lower loads than expected in early metal airplanes (see specifically the Comet 1)? I. The effects of cyclic fatigue were not appreciated for airplane pressurization/depressurization. II. The effects of stress concentration at the corners of square windows were not appreciated. III. The effects of defect presence and growth were not appreciated for large structures

A I only

B Both II and III

C I, II, and III

D Both II and III

E Both I and III

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Explanation:

All of the effects listed were important. These sorts of difficulties are not unusual for new engineering efforts. You may read in detail about the Comet 1 failure here.

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Mechanics I ME102

Author:

Stephanie Redfern

The Saylor Foundation

USA

Access: Public Instant Grading

Attribution: Stephanie Redfern, Ranjeet (Ron) Agarwala, and Dr. Steve Gibbs. Mechanics I. The Saylor Academy 2014, http://www.saylor.org/courses/me102/

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