Materials Science And Engineering Properties
1st Edition
ISBN: 9781111988609
Author: Charles Gilmore
Publisher: Cengage Learning
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Chapter 11, Problem 11.2P
To determine
The length of crack initiated the fracture.
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Failure of engineering materials
A specimen of a 4340 steel alloy with a plane strain fracture toughness of 54.8 MPa is exposed to a stress of 1766 MPa. Assume that the parameter Y has a value of 1.6.If the largest surface crack is 0.5236 mm long, determine the critical stress .
Which of the following statements regarding brittle failure and crack propagation is CORRECT?
Elastic energy is consumed when a crack propagates, due to unloading of a volume of material.
Energy is released when the surface area of a material increases, as a result of crack propagation.
O The stress at the tip of a crack is less than the nominal stress (force over the cross-sectional area of the
component) because the stress flows around the defect.
O The fracture toughness of a material is its resistance to an increase in the radius of curvature of a crack.
O A material will fail in brittle fashion when the stress intensity at the crack tip is greater than the fracture
toughness of the material.
A thin plate of a ceramic material with E = 225 GPa is loaded in tension, developing a stress of 450 MPa. Is the specimen likely to fail if the most severe flaw present is an internal crack oriented perpendicular to the load axis that has a total length 0.25 mm and a crack tip radius of curvature equal to 1 μm?
Chapter 11 Solutions
Materials Science And Engineering Properties
Ch. 11 - Prob. 1CQCh. 11 - Prob. 2CQCh. 11 - Prob. 3CQCh. 11 - Prob. 4CQCh. 11 - Prob. 5CQCh. 11 - Prob. 6CQCh. 11 - Prob. 7CQCh. 11 - Prob. 8CQCh. 11 - Prob. 9CQCh. 11 - Prob. 10CQ
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