4) Which of the following is correct in caseof Residual stresses?O Increase fatigue strengthCan cause cracking in the material even inthe absence of applied load) Compressive residual stresses increasethe fatigue life of the componentO None of the above

Residual stress: These are the stress that remains in the object (specially in welded object) even…

Answered: 4) Which of the following is correct in…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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A material with a low dislocation density will have a higher yield stress as compared to a material having a high dislocation density True False
QUESTION 1 Select from the following statements, those which describe the process and conditions required for brittle fracture. (Note: Partial credit is not available for this question. Credit will only be awarded if all correct answers, and no incorrect answers, are selected). A. Occurs along defined crystallographic planes, thus leaving smooth fracture surfaces B. Occurs due to repeated loading and unloading below the yield strength of the material OC. Occurs in materials where the bonding strength is high relative to the yield strength D. The stress concentration at the crack tip exceeds the inter-atomic bonding energy ☐ E. Involves the nucleation, growth and coalescence of voids, thus resulting in rough fracture surfaces OF. Is a slow process whereby there is warning prior to failure
How can the change in length of a statically determinate member be easily calculated?
QUESTION 8 A small component is made from aluminium 7475 where Kc = 35.2 MPa m 1/2 Non-destructive testing by micro-computed tomography showed the component to contain cracks of up to 2a = 0.05 mm in length. Laboratory tests showed the crack growth rate under cyclic loading is given by: Where A= 1.10x10-13 Assuming that: da dN = ΑΔΚΑ (MN m-2)-4 m-1 and the component is subjected to an alternating stress of range A = 180 MPa about a mean tensile stress of 40/2. ΔΚ = Δονπα Calculate the number of cycles to failure, give your answer in number of 1000s of cycles to 3 significant figures (e.g. 101,000 cycles would be inputted as 101)
Use the fatigue curves below to answer the following questions.: Which curve(s) represent(s) a non-ferrous metal? (Select all that apply) Group of answer choices Curve B Curve A Curve C

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4) Which of the following is correct in case of Residual stresses? Increase fatigue strength Can cause cracking in the material even in the absence of applied load OCompressive residual stresses increase the fatigue life of the component None of the above