lab3.docx - LAB 3 Bending and Torsion Tests Chi Zhang/Wai...

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LAB 3: Bending and Torsion TestsChi Zhang/Wai Chuen ChanCEE 300/TAM 324Section: AB5TA: Gaurav SinghalFebruary 27, 2018
ABSTRACTThe objective for this lab, by conducting four-point bending and torsion tests, is to determine thesimilarities and differences between the behaviors of structural material subject to bending,torsion, compression, and tension. Also, the result obtained during the lab was used to calculatethe modulus of rupture in bending and modulus of rupture in torsion. Those two quantities werethen compared with tension failure data acquired from previous lab. Bending test wereperformed on a rectangular shape specimen with three different material, which are 1045 Steelhot rolled (1045 steel HR), 6061-T6 Aluminum (6061 alum), and polymethylmethacrylate(PMMA). Torsion test will be performed on a circular cross-sectional specimen with threedifferent materials, which are 1045 Steel normalized (1045 steel NM), 6061-T6 Aluminum (6061alum), and polymethylmethacrylate (PMMA). Based on the result and analysis after theexperiment, different types of material behave different under tension, compression, bending,and torsion. Meanwhile, the fracture surface for material with different ductility is completelydifferent in tension and torsion test. 1. INTRODUCTION1.1 Mechanical Properties and MaterialThe mechanical properties of a material are those properties that involve a reaction to an appliedload. Mechanical properties are essential since it helps us to determine the range of usefulness ofmaterial and help us to classify and identify the material. The most common properties of amaterial are strength, ductility, hardness, impact resistance, and fracture toughness. [1]Severaltypes of material, 1045 steel hot rolled & normalized, 6061-T6 aluminum (alum), andpolymethylmethacrylate (PMMA), were tested in the lab. Real world application for 1045 steel
include axles various, bolts or connecting rods. [2]Typical uses for 6061-T6 aluminum includebuilders of boats, watercraft or bicycle frames. [3]PMMA is broadly uses as substitute for glass inshatterproof windows, skylights or aircraft canopies. [4] 1.2 Bending TestA bending test is a test which is a simple and inexpensive test that used to evaluate the ductilityand the resistance to fracture for a certain specimen. The test helps to determine the reaction ofthe specimen under bending moment. The test will be conducted by using an Instron Model 4400load frame, deforming the specimen at a constant rate until failure occurs or reaches themaximum of the deflection. The deflection and the load data are collected on a computer dataacquisition system connected to the load frame. 1.3 Torsion TestA torsion test can be conducted on most materials to determine the torsional properties of thematerial. The test helps to exhibits the behavior of a material when the specimen is twisted orunder torsional forces as a result of applied moments that cause shear stress about the moment.The test will be conducted on a gear-driven torsion machine which was designed by student at

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