EGB270 Assessment 3 Title Page (1)

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Queensland University of Technology *

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270

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Civil Engineering

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Oct 30, 2023

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5

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QUT EGB270-2021 Civil Engineering Materials Prac 3 Report - Comparison of Steel Properties from I Beam Web and Flange Student no: Student name ： Report date: 04/06/2021 DECLARATION I am aware of the University rule that a student must not act in a manner which constitutes academic dishonesty as stated and explained in the QUT Manual of Policies and Procedures (Section C, Part 5.3 Academic Dishonesty , accessible via http://www.mopp.qut.edu.au/C/C_05_03.jsp ). I confirm that this work represents my individual effort and does not contain plagiarised material. NAME (TYPED OR PRINTED BY HAND): Signature ______________________________________________ Date : 01/06/2021
Question 5) Draw stress strain curves of the web and flange samples. -5 0 5 10 15 20 25 30 35 0 100 200 300 400 500 600 Stress Versus Strain Graph Compating Web and Flange Web Flange Strain (%) Stress (MPa)
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Question 7) Looking at the stress strain curves of both specimens and the data on Table 6. Is there any tensile property of the Web sample different from that of the flange sample? If yes, point out the differences and provide the possible reasons. As seen from the strain curves in question five, and the calculations presented in question six, the web possess higher values in most properties assessed than the flange. This includes the elastic modulus, yield strength, ultimate tensile strength, yield ratio, and fracture strength. The elongation present in both samples is similar however, the area reduction in the flange is significantly more than the web. It is likely that the elastic modulus, yield strength and ratio, UTS and fracture strength are higher in the web as this section of an I-beam are typically designed to resist higher tensile loads, despite a smaller cross-sectional area. Alternatively, the flange in an I-beam is responsible for resisting bending. This very reason gives causation for why the area reduction in the flange is significantly higher then in the web. Since the flange is primarily responsible for resisting bending in an I-beam, this section should allow for more deformation of the material. Additionally, it is plausible that were inconsistencies in the molecular makeup of the sample used for the flange test which would account for the lower numbers calculated, however this is an unlikely cause for the results. These observations are clear from the stress strain curves and calculations present in question five and six.

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