Properties of MetalsDOE-HDBK-1017/1-93STRESS-STRAIN RELATIONSHIPSTRESS-STRAIN RELATIONSHIPMost polycrystalline materials have within their elastic range an almost constantrelationship between stress and strain. Experiments by an English scientist namedRobert Hooke led to the formation of Hooke's Law, which states that in the elasticrange of a material strain is proportional to stress. The ratio of stress to strain,or the gradient of the stress-strain graph, is called the Young's Modulus.EO 1.10DEFINE the following terms:a.Bulk Modulusb.Fracture pointEO 1.11Given stress-strain curves for ductile and brittle material,IDENTIFY the following specific points on a stress-strain curve.a.Proportional limitb.Yield pointc.Ultimate strengthd.Fracture pointEO 1.12Given a stress-strain curve, IDENTIFY whether the type ofmaterial is ductile or brittle.EO 1.13Given a stress-strain curve, INTERPRET a stress-strain curvefor the following: a.Application of Hooke's Lawb.Elastic regionc.Plastic regionThe elastic modulirelevant to polycrystalline material are Young's Modulus of Elasticity, theShear Modulus of Elasticity, and the Bulk Modulus of Elasticity.Young's Modulus of Elasticityis the elastic modulus for tensile and compressive stress andis usually assessed by tensile tests. Young's Modulus of Elasticity is discussed in detailin the preceding chapter.Rev. 0Page 15MS-02