Manufacturing Engineering & Technology
7th Edition
ISBN: 9780133128741
Author: Serope Kalpakjian, Steven Schmid
Publisher: Prentice Hall
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Chapter 3, Problem 10RQ
Explain stress-corrosion cracking. Why is it also called season cracking?
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1) What is the impact of fracture toughness on materials?
2) Why do we control corrosion?
What types of conditions give rise to the formation of cracks at the stress concentration?
An airplane part is to be designed from view point of Fracture Toughness for which two
materials are available. Consider Y=1.2 and ow =400 MPa, calculate
(a) maximum internal crack length under the given condition for each material type.
(b) How much stress on Aluminum part can be increased/decreased to comply with
the critical crack length of 3 mm.
1/2
Кіс, МPa m
Aluminum (7075-T3)
30
Titanium Ti-6AI-4Va
55
Chapter 3 Solutions
Manufacturing Engineering & Technology
Ch. 3 - List several reasons that density is an important...Ch. 3 - Explain why the melting point of a material can be...Ch. 3 - What adverse effects can be caused by thermal...Ch. 3 - Prob. 4RQCh. 3 - What is the piezoelectric effect?Ch. 3 - Prob. 6RQCh. 3 - Prob. 7RQCh. 3 - What is the difference between thermal...Ch. 3 - What is corrosion? How can it be prevented or...Ch. 3 - Explain stress-corrosion cracking. Why is it also...
Ch. 3 - Prob. 11RQCh. 3 - Prob. 12RQCh. 3 - What is the fundamental difference between...Ch. 3 - Describe the significance of structures and...Ch. 3 - Prob. 15QLPCh. 3 - Note in Table 3.1 that the properties of the...Ch. 3 - Rank the following in order of increasing thermal...Ch. 3 - Prob. 18QLPCh. 3 - Explain how thermal conductivity can play a role...Ch. 3 - What material properties are desirable for heat...Ch. 3 - Prob. 21QLPCh. 3 - Prob. 22QLPCh. 3 - Two physical properties that have a major...Ch. 3 - Which of the materials described in this chapter...Ch. 3 - Which properties described in this chapter can be...Ch. 3 - If we assume that all the work done in plastic...Ch. 3 - The natural frequency, f, of a cantilever beam is...Ch. 3 - Plot the following for the materials described in...Ch. 3 - It can be shown that thermal distortion in...Ch. 3 - Add a column to Table 3.1 that lists the...Ch. 3 - Prob. 31SDPCh. 3 - Prob. 32SDPCh. 3 - Prob. 33SDPCh. 3 - Prob. 34SDPCh. 3 - Prob. 36SDPCh. 3 - Prob. 38SDPCh. 3 - Prob. 40SDPCh. 3 - Prob. 41SDPCh. 3 - Prob. 42SDPCh. 3 - Prob. 43SDP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Give three examples of design features that may lead to a reduction in component fracture strength.arrow_forwardEngineering Metallurgyarrow_forward3. Linear elastic fracture mechanics (LEFM) predicts there will be an infinite stress at the tip of a crack. Why is this not the case? What happens microstructurally in metals, polymers and ceramics that prevents this?arrow_forward
- How can the fatigue be prevented?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_forwardsmall crack, 4mm deep, is found on the edge of a large, thick plate structure. The plate is continuously subjected to a uniform cyclic tensile stress (in the direction perpendicular to the crack plane) which varies from 0 MPa to 100 MPa and back to 0 MPa every 40 seconds. If the next inspection is to take place in 30 days, would it be safe to delay the replacement or repair of the plate until that time? The stress intensity factor, KI, for this type of crack is related to the nominal stress, G, and the crack length, a, via the relationship is K, = 1.12a Va %3D For the plate material, the yield stress is 800 MPa, the fracture toughness is 50 MN/m2 and threshold stress intensity factor range is 6 MN/m3/2, The fatigue-crack growth rate per cycle for the material, da/dN, can be defined by: 3/2 da / dN = 2.8 x 10-12 (AK,) ^PY (m/cycle) Where AK1 has unit MN/m e 8:34 /arrow_forward
- The 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_forwardWhat are the different types of corrosion in mechanical engineering and how are they classified?arrow_forwardAn aluminium roofing sheet on a particular building was making a cracking noise at temperature of 60oC. The sheet have an initial length of 3m long at room temperature. How long have the aluminium sheet been expanded to be causing that cracking noise. NB: Take the coefficient of expansivity of the sheet to be 24x10-6.arrow_forward
- List 3 of the design methods that can be applied to avoid the occurrence of fatiguearrow_forwardSummarize the fundamental concept behind Griffith’s major contribution to understanding the fracture process.arrow_forwardState the limitation of Griffith’s analysis with regard to crack geometry, and explain why it is a limitation.arrow_forward
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