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Describe the mutual relationship between the fig and wasp and comment on the phenomenon that operates in this relationship.

Answer» <html><body><p></p>Solution :(i) Portion OA:In this region, stress is very small such that stress is proportional to strain, which means Hooke's law is valid. The point A is called limit of proportionality because above this point Hooke's law is not valid. The slope of the line OA gives the Young's <a href="https://interviewquestions.tuteehub.com/tag/modulus-1100097" style="font-weight:bold;" target="_blank" title="Click to know more about MODULUS">MODULUS</a> of the wire.<br/>(ii) Portion AB:This region is reached if the stress is increased by a very small amount. In this region, stress is not proportional to the strain. But once the stretching force is removed, the wire will regain its <a href="https://interviewquestions.tuteehub.com/tag/original-1139424" style="font-weight:bold;" target="_blank" title="Click to know more about ORIGINAL">ORIGINAL</a> length. This behaviour ends at point B and hence, the point B is known as <a href="https://interviewquestions.tuteehub.com/tag/yield-1465134" style="font-weight:bold;" target="_blank" title="Click to know more about YIELD">YIELD</a> point. The elastic behaviour of the material in stress-strain <a href="https://interviewquestions.tuteehub.com/tag/curve-941741" style="font-weight:bold;" target="_blank" title="Click to know more about CURVE">CURVE</a> is OAB.<br/>(iii) Portion BC:If the wire is stretched beyond the point B, stress is increases and the wire will not regain its original length after the removal of stretching force.<br/>(iv) Portion CD:With further increase in stress (beyond the point C), the strain increases rapidly and reaches the point D. Beyond D, the strain increases even when the <a href="https://interviewquestions.tuteehub.com/tag/load-11593" style="font-weight:bold;" target="_blank" title="Click to know more about LOAD">LOAD</a> is removed and breaks (ruptures) at the point E. Hence, the maximum stress (here D) beyond which the wire breaks is called breaking stress or tensile strength. The corresponding point D is known as fracture point. The region BDDE represents the plastic behaviour of the material of the wire.</body></html>


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