# 2009+9-1 - 1 Introduction to Solid Mechanics-Vm211...

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1 Professor Xila Liu 1 SJTU Introduction to Solid Mechanics-Vm211 Chapter 9 Mechanical Properties of Materials Chapter 9 Mechanical Properties of Materials SJTU Introduction to Solid Mechanics-Vm211 CHAPTER OBJECTIVES ± Show relationship of stress and strain using experimental methods to determine stress- strain diagram of a specific material SJTU Introduction to Solid Mechanics-Vm211 CHAPTER OBJECTIVES ± Discuss the behavior described in the diagram for commonly used engineering materials ± Discuss the mechanical properties and other test related to the development of mechanics of materials SJTU Introduction to Solid Mechanics-Vm211 1. Tension and Compression Test 2. Stress-Strain Diagram 3. Stress-Strain Behavior of Ductile and Brittle Materials 4. Hooke s Law 5. Strain Energy 6. Poission sRatio 7. Shear Stress-Strain Diagram Chapter Outline SJTU Introduction to Solid Mechanics-Vm211 ± Strength of a material can only be determined by experiment ± One test used by engineers is the tension or compression test SJTU Introduction to Solid Mechanics-Vm211 ± This test is used primarily to determine the relationship between the average normal stress and average normal strain in common engineering materials, such as metals, ceramics, polymers and composites TENSION & COMPRESSION TEST

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1 Professor Xila Liu 2 SJTU Introduction to Solid Mechanics-Vm211 Performing the tension or compression test ± Specimen of material is made into standard shape and size ± Before testing, 2 small punch marks identified along specimen s length SJTU Introduction to Solid Mechanics-Vm211 Performing the tension or compression test ± Measurements are taken of both specimen s initial x- sectional area A 0 and gauge-length distance L 0 ; between the two marks SJTU Introduction to Solid Mechanics-Vm211 Performing the tension or compression test ± Seat the specimen into a testing machine shown below ± The machine will stretch specimen at slow constant rate until breaking point ± At frequent intervals during test, data is recorded of the applied load P. SJTU Introduction to Solid Mechanics-Vm211 Performing the tension or compression test ± Elongation δ = L L 0 is measured using either a caliper or an extensometer ± δ is used to calculate the normal strain in the specimen ± Sometimes, strain can also be read directly using an electrical-resistance strain gauge SJTU Introduction to Solid Mechanics-Vm211 ± A stress-strain diagram is obtained by plotting the various values of the stress and corresponding strain in the specimen STRESS-STRAIN DIAGRAM SJTU
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## This note was uploaded on 08/09/2011 for the course EE 211 taught by Professor Liuxila during the Summer '09 term at Shanghai Jiao Tong University.

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2009+9-1 - 1 Introduction to Solid Mechanics-Vm211...

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