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Following diagram represents ____________ (a)typical stress strain diagram

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Following diagram represents ____________

(a) typical stress strain diagram

(b) lift curve slope

(c) drag curve slope

(d) drag polar

This question was posed to me in an international level competition.

My enquiry is from Structures Fundamentals topic in chapter Structures and Loads of Aircraft Design

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The correct option is (a) typical stress strain diagram

Explanation: Above diagram is showing typical relationship between stress and strain. As shown in diagram up to certain values of stress curve follows linear relationship. This is due to hook’s law. Lift curve slope is showing a typical variation in lift coefficient with respect to angle of attack.

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