EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 3, Problem 3.12Q
To determine
The reason of the anisotropy for the cold worked metal piece.
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1. Explain in 1-3 bullets how as a practicing engineer you determine the yield strength of a metal from a tensile stress-strain curve.
2. Explain what is happening at the yield strength for a metal from a physical standpoint in 1-3 bullets. (e.g. what are the atoms doing?)
The mechanical properties of a material can be determined by a simple strees strain test. Explain THREE (3) types of test that mostly conducted for metals at room temperature. Support your answer with the diagrams of material after deformation.
Questions(a) Explain what is meant by the terms: terile stress and Young's modules.Define the quantity which relates these terms.
(b) When measuring Young's modulus of a material it is common to use aspecimen which is (1) very long and (ii) very thin. Give the reasons for this.
Describe, with a labelled diagram, how you would measure accurately theextension of such a wire under an applied load.
(e) The graph below shows how the extension of a wire varies with the loadapplied to it. The wire used has a length of 3m and a diameter of 5 x 10^-4m
i. Calculate the tensile stress produced by a load of 50N.ii. Find the energy stored in the wire when the load is acting.iii. Calculate the reduction in gravitational PE of a 5kg mass used to providethe load.iv. Calculate Young's modulus for the metal of the wire.
Chapter 3 Solutions
EBK MANUFACTURING PROCESSES FOR ENGINEE
Ch. 3 - Prob. 3.1QCh. 3 - Prob. 3.2QCh. 3 - Prob. 3.3QCh. 3 - Prob. 3.4QCh. 3 - Prob. 3.5QCh. 3 - Prob. 3.6QCh. 3 - Prob. 3.7QCh. 3 - Prob. 3.8QCh. 3 - Prob. 3.9QCh. 3 - Prob. 3.10Q
Ch. 3 - Prob. 3.11QCh. 3 - Prob. 3.12QCh. 3 - Prob. 3.13QCh. 3 - Prob. 3.14QCh. 3 - Prob. 3.15QCh. 3 - Prob. 3.16QCh. 3 - Prob. 3.17QCh. 3 - Prob. 3.18QCh. 3 - Prob. 3.19QCh. 3 - Prob. 3.20QCh. 3 - Prob. 3.21QCh. 3 - Prob. 3.22QCh. 3 - Prob. 3.23QCh. 3 - Prob. 3.24QCh. 3 - Prob. 3.25QCh. 3 - Prob. 3.26QCh. 3 - Prob. 3.27QCh. 3 - Prob. 3.28QCh. 3 - Prob. 3.29QCh. 3 - Prob. 3.30QCh. 3 - Prob. 3.31QCh. 3 - Prob. 3.32QCh. 3 - Prob. 3.33QCh. 3 - Prob. 3.34QCh. 3 - Prob. 3.35QCh. 3 - Prob. 3.36QCh. 3 - Prob. 3.37QCh. 3 - Prob. 3.38QCh. 3 - Prob. 3.39QCh. 3 - Prob. 3.40QCh. 3 - Prob. 3.41QCh. 3 - Prob. 3.42QCh. 3 - Prob. 3.43PCh. 3 - Prob. 3.44PCh. 3 - Prob. 3.45PCh. 3 - Prob. 3.46PCh. 3 - Prob. 3.47PCh. 3 - Prob. 3.48PCh. 3 - Prob. 3.49PCh. 3 - Prob. 3.50PCh. 3 - Prob. 3.51PCh. 3 - Prob. 3.52PCh. 3 - Prob. 3.53PCh. 3 - Prob. 3.54P
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- a) Briefly explain why HCP metals are typically more brittle than FCC and BCC metals. b) Two previously undeformed specimens of the same metal are to be plastically deformed by reducing their cross-sectional areas (cold work). One has a circular cross section, and the other is rectangular; during deformation the circular cross section is to remain circular, and the rectangular is to remain as such. Their original and deformed dimensions are as follows: Circular (diameter, mm) Rectangular (mm) 125 x 175 Original dimensions 15.2 Deformed dimensions 11.4 75 x 200 Which of these specimens will be the hardest after plastic deformation, and why?arrow_forward(b) The yield stress for a metal changes from 450 Nmm-2to 610 Nmm-2 when the average grain diameter decrease from 0.043 mm to 0.022 mm. Determine the yield stressfor the same metal with an average grain diameter of 0.030 mm.arrow_forwardDraw two schematic graphs using pencil showing a typical stress-strain curve for aluminum. The first graph should show engineering stress vs engineering strain, and the second graph should show true stress vs true strain. Label the showing: (i) elastic modulus (ii) proportional limit (iii) yield stress (iv)yield strain (v) fracture stress (vi) fracture strain on each graph. You may showboth graphs on one plot. Explain the difference between engineering stress and true stress.arrow_forward
- In hot working of metals, the distorted grains are completely removed and fresh new grains are formed. Select one: True Falsearrow_forward2.) Two previously undeformed specimens of the same metal are to be plastically deformed by reducing their cross-sectional areas. One has a circular cross section, and the other is rectangular; during deformation the circular cross section is to remain circular, and the rectangular is to remain as such. Their original and deformed dimensions are as follows: Circular Rectangular (diameter, mm) (тm) Original dimensions Deformed dimensions 18.0 20 x 50 15.9 13.7 × 55.1 Which of these specimens will be the hardest after the plastic deformation? a) The deformed circular specimen will be harder b) The deformed rectangular specimen will be harder c) Both will have the same hardness d) Both would brake e) No estimation can be made for such processarrow_forwardQuestion 2 a) Briefly explain why HCP metals are typically more brittle than FCC and BCC metals. b) Two previously undeformed specimens of the same metal are to be plastically deformed by reducing their cross-sectional areas (cold work). One has a circular cross section, and the other is rectangular; during deformation the circular cross section is to remain circular, and the rectangular is to remain as such. Their original and deformed dimensions are as follows: Circular (diameter, mm) Rectangular (mm) Original dim ensions 15.2 125 x 175 Deformed dimensions 11.4 75 x 200 Which of these specimens will be the hardest after plastic deformation, and why?arrow_forward
- Which method do we use to monitor dislocation movements in tensile testing? How monitoring is done in this method, explain the working mechanism of the system in detail.arrow_forwardThe critical resolved shear stress for copper is 0.48 MPa. Determine the maximum possible yield strength for a single crystal of Cu pulled in tension.arrow_forwardA 1.5-cm-diameter metal bar with a 3-cm gage length (l0) is subjected to a tensile test. The following measurements are made: Determine the strain-hardening coefficient for the metal. Is the metal most likely to be FCC, BCC, or HCP? Explain.arrow_forward
- It is known that a brass alloy has a yield strength of 275 MPa, a tensile strength of 380 MPa and a modulus of elasticity of 103 GPa. It is determined that a 12.7 mm diameter and 250 mm long cylindrical sample made of this alloy is elongated by 7.6 mm under the tensile stress effect. Based on this information, is it possible to calculate the magnitude of the load required to generate the said elongation? If possible, calculate, if not, explain why.arrow_forwardDuring the recrystallization of a cold-worked material, which of the following statement(s) is (are) true? O There is some reduction in the number of dislocations. O Some of the internal strain energy is relieved. O The metal becomes more ductile, as in its precold-worked state. O Grains with high strains are replaced with new, unstrained grains. O There is a significant reduction in the number of dislocations, to approximately the number found in the precold-worked state, O The thermal conductivity is recovered to its precold-worked state. O All of the internal strain energy is relieved. O The electrical conductivity is recovered to its precold-worked state.arrow_forwardin tensile test data, show step by step how to find stress and strain in aluminiumarrow_forward
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