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A ceramic matrix composite contains internal flaws as large as 120 ?m in length. The plane strain fracture toughness of the composite is 45 MP am, and the tensile strength is 550 MPa, assume f=1.0
When a stress equal to the tensile strength is applied, what is the stress intensity factor, K?
What is the stress needed to cause the flaw to propagate?
And If a newly annealed copper wire is drawn thru a die which decreases its diameter from 3.1 mm to 2.7 mm, how much cold-work was performed?
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