EBK MANUFACTURING PROCESSES FOR ENGINEE
6th Edition
ISBN: 9780134425115
Author: Schmid
Publisher: YUZU
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Chapter 3, Problem 3.29Q
To determine
The influence of the thermal expansion and thermal conductivity on the cracking of the workpiece and die during thermal cycling.
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Please explain crack initation and propagation during metal fatigue? Explain factors that affect fatigue life and solutions to prevent fatigue failure. Explain environmental effects on fatigue behavior of materials.
Which of these cracks will lead to failure first from the table in the picture? And present your findings in a table format and comment briefly.
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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- The specific surface energy for aluminum oxide is 0.90 N/m, and the elastic modulus is 393 GPa. The critical stress, in MPa, required for propagation of a surface crack of length 0.25 mm is 9.49 Pa 30.0 GPa 90.0 GPa 30.0 MPaarrow_forward7. By referring to a sketch showing a stress concentration, describe the phenomenon of crack initiation in high cycle fatigue and comment on the proportion of fatigue life that is used in initiating a crack under these conditions. 8. By considering a notched metal bar as an example, explain (with the aid of diagrams), how you would reduce the probability of fatigue failure by applying self-stresses. 9. Describe, with sketched examples, how the stress-raising effect of circular and elliptical holes can be considered qualitatively as being analogous to liquid flow. 10. By considering a circular hole in a thin elastic sheet, explain (with the aid of any diagrams as appropriate) how a stress concentration can magnify stress. 11. Explain the principles of designing alloys for oxidation resistance.12. Describe and explain (with the aid of a sketch) how crack propagation is enhanced through stress corrosion cracking Answer All partsarrow_forwardWhat is a fatigue limit, and what relevance does it have for lifetimes in the gigacycle (109) regime? Explainarrow_forward
- Components that suffered fatigue failure during operation can be identified byseveral characteristic features. In a few words, describe some of these features. Sketch orprovide an image of a component that has failed due to fatigue. Include labels on the imagedenoting the onset of crack propagation and hallmark features of fatigue failure.arrow_forwardWhy are the deformations that take place within a body are almostinfinitesimal?arrow_forwardDiscuss the different sources of size effect. Describe energetic size effect in fracture using two different sizes of a plate with a center notch. Explain the significance of plate thickness.arrow_forward
- Imagine that you have two cracked components that are identical to one another except that Component A has a preexisting crack that is twice as long as that found in Component B. Does that mean that the fatigue lifetime of Component A will be 50% that of Component B?arrow_forward1. Explain what is meant by the term fast fracture, stating its causes, and give two examples from which it might occur. 2. Briefly describe, with the aid of a sketch in each case, the appearance of a fracture surface that has undergone (i) ductile tearing and (ii) cleavage.3. Explain, with the aid of a diagram, how a crack propagates by ductile tearing within the plastic zone of an engineering metal.4. Explain, with the aid of diagrams, how crack propagation is affected by the presence of the fibers in glass fibre reinforced resins.5. With the aid of a sketch, describe and explain the fracture surface characteristics of a metal component that has undergone fatigue failure. 6. By referring to graphical representations of fatigue test results, explain the terms S-N curve, Fatigue Limit and Endurance Limit. Please answer all partsarrow_forwardThe overall fracture strength of glass may be increased by etching away a thin surface layer. It is thought that the etching can alter the surface crack geometry. Calculate the ratio of the etched and original crack tip radii if the fracture strength increases by a factor of 8 when 48 percent of the crack length is removed.arrow_forward
- The fracture strength of glass may be increased by etching away a thin surface layer. It is believed that the etching may alter the surface crack geometry (i.e. reduce crack length and increase tip radius). Calculate the ratio of the etched and original crack tip radii if the fracture strength is increased by a factor of 8 when 48% of the crack length is removed.arrow_forwardExplain how fatigue failure occurs even if the material does not see overall stress levels higher than the yield strength.arrow_forwardWhy is fatigue generally less of a problem with ceramics and glasses than with metals and polymers?arrow_forward
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