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Exam #1 Study Guide (Material Selection Metals 341) Q
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Give the steps that are included in designing a new product. - ANSWERS1. Design the concept - begin to develop concepts based on the product's intended use.
What is the relationship between torsional strength and tensile strength? - ANSWERSTorsional strength is half of the tensile strength. What are rules of thumb for material properties? - ANSWERSUltimate tensile strength - 500X Brinnell hardness Ultimate torsional strength - 1/2 the UTS and 250X Brinell hardness. With a tensile test, why does the machine pull apart the metal at a constant rate? - ANSWERSIn order to have a constant rate of strain and accurate results. Where does a material perform plastic and elastic deformation? - ANSWERSPlastic deformation - Anywhere AFTER the Yield strength. Elastic deformation - Anywhere BEFORE the yield strength. How do you measure the modulus of elasticity? - ANSWERSFind the slope of the curve. How do you determine toughness on a Stress/Strain curve? - ANSWERSThe area under the curve. Describe the process to S.S. strengthen a metal. - ANSWERS1. Melt the base material to its solutionizing temperature.
What are the advantages of cold finished over hot finished? - ANSWERSCloser size tolerance Better surface finish Better mechanical properties Better machinability What are the disadvantages of cold finished over hot finished? - ANSWERSHigher cost Loss of strength above the recrystallization temp Distortion during machining More anisotropy Lower ductility How are the important material properties to weight reduction measured? - ANSWERSTensile testing What are typical failure modes in weight reduction applications? - ANSWERS1. Deflection - Controlled by the material's modulus of elasticity.