EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 3, Problem 3.20Q
To determine
The conditions that induce the brittle fracture in piece of metal.
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specimen of a 4340 steel alloy with a plane strain fracture toughness of 54.8 MPa√m is exposed to a stress of 1030 MPa. Will this specimen experience fracture if it is known that the largest surface crack is 0.5 mm long? Why or why not? Assume that the parameter Y has a value of 1.0.
3. How can you understand if a fracture is brittle or ductile? Briefly explain which experimental
techniques can be used and how the results can be interpreted.
Question 3:
A specimen of a 4340 steel alloy, having a plane strain fracture toughness of 45 MPalm
a yield strength of 800 MPa, and a tensile strength of 1100 MPa, is exposed to a stress of
1000 MPa. Will this specimen experience fracture if it is known that the largest surface
crack is 0.75 mm long? Why or why not? Assume that the parameter Y has a value of
1.0.
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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- Draw the stress strain diagram for a ductile and brittle material and what is the difference in it? What do you understand by strain hardening? What do you mean by percentage reduction in area? Explain the steps in ductile fracture. Explain the modes of failure in tension test.arrow_forwardSome aircraft component is fabricated from an aluminium alloy that has a plane strain fracture toughness of 35 MPa√m. It has been determined that fracture results at a stress of 250 MPa when the maximum (or critical) internal crack length is 2.0 mm. For this same component and alloy, show that whether fracture will or will not occur if the stress level is at 325 MPa and the maximum internal crack length is 1.0 mm.arrow_forwardInterpret the following properties of brittle fracture and ductile fracture in terms of: Crack propagation Choose the preferred mode of fracture with ONE (1) reasonarrow_forward
- For a steel element with a 0.2% steel characteristic, a stress test was applied and the analysis of the data thrown by the material is required in terms of a variation of force and the respective deformations. Determine the following: A.Determine the percentage elongation at the point where the part develops the fracture. B.Construct the “Stress-Strain” diagram C.Maximum tensile strength of the part.arrow_forwardSome aircraft component is fabricated from an aluminium alloy that has a plane strain fracture toughness of 40 MPa√m. It has been determined that fracture results at a stress of 300 MPa when the maximum (or critical) internal crack length is 4.0 mm. For this same component and alloy, will fracture occur at a stress level of 260 MPa when the maximum crack is 6.0 mm? Why or why not?arrow_forwardDiscussion : • Difficulties in testing brittle materials. • Advantages of stress - strain diagram. • Sources of error you expect in the experiment. • Define the term strain hardening and explain in which stage in the stress- strain diagram it occurs, what are its reasons, and its effects on material properties? • Compare between the brittle and ductile fracture. fr in tearrow_forward
- Describe ductile fracture and brittle one. what is the difference between them in tensile test specimen, Explain in detail.arrow_forwardWhy is the prediction of the tensile fracture of a brittle material is difficult to predict?arrow_forwardDraw an illustration showing the five stages of ductile tensile fracture, then briefly explain the phenomenon happening on different stagesarrow_forward
- A high-strength steel has yield strength of 1165 MPa and fracture toughness of 95 MPavm. Calculate the size of an internal crack that will lead to catastrophic failure at an applied stress of 80% yield strength. (Y = 1.00 for internal crack, and Y=1.12 for surface crack)arrow_forward11. List the conditions that can induce brittle failure even in a ductile material.arrow_forwardDescribe the appearance of a fatigue fracture?arrow_forward
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