Suppose that the fatigue data for the steel alloy in Problem 9.12 were taken for bending-rotating tests, and that a rod of this alloy is to be used for an automobile axle that rotates at an average rotational velocity of 600 revolutions per minute.  Give the maximum lifetimes of continuous driving that are allowable for the following stress levels:  (a) 450 MPa (65,000 psi), (b) 380 MPa (55,000 psi), (c) 310 MPa (45,000 psi), and (d) 275 MPa (40,000 psi).   Reference: Problem 9.12 is listed below (only use for reference but does not need to be solved). The tensile strength of brittle materials may be determined using a variation of Equation 9.1. Compute the critical crack tip radius for an Al2O3 specimen that experiences tensile fracture at an applied stress of 275 MPa (40,000 psi). Assume the acritical surface crack length of 2 x 10-3 mm and theoretical fracture strength of E/10, where E is the modulus of elasticity.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Suppose that the fatigue data for the steel alloy in Problem 9.12 were taken for bending-rotating tests, and that a rod of this alloy is to be used for an automobile axle that rotates at an average rotational velocity of 600 revolutions per minute.  Give the maximum lifetimes of continuous driving that are allowable for the following stress levels:  (a) 450 MPa (65,000 psi), (b) 380 MPa (55,000 psi), (c) 310 MPa (45,000 psi), and (d) 275 MPa (40,000 psi).

 

Reference:

Problem 9.12 is listed below (only use for reference but does not need to be solved).

The tensile strength of brittle materials may be determined using a variation of Equation 9.1. Compute the critical crack tip radius for an Al2O3 specimen that experiences tensile fracture at an applied stress of 275 MPa (40,000 psi). Assume the acritical surface crack length of 2 x 10-3 mm and theoretical fracture strength of E/10, where E is the modulus of elasticity.

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