Consider a large metal plate that has plane strain fracture toughness of 80 MPa mos. The...
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Consider a large metal plate that has plane strain fracture toughness of 80 MPa mos. The plate is loaded in tension to 500 MPa and then completely unloaded, in a cyclic fashion, once every 5 minutes. Assume that plane strain conditions are met and f=1.0 for stress intensity factor computations. (b) Assuming that the plate should last ten years under this fatigue loading regime, compute the number of fatigue cycles expected during that period. (c) Using Paris law, estimate the maximum allowable initial crack length a, in the unloaded material for it to last 10 years without failure. For this material assume C= 1.62x10-¹2 (assume units of MPa and m) and n=3.2. Now consider the cyclic crack extension vs. stress intensity factor fracture response curve (solid black line) below for a different large plate specimen tested under plane strain conditions. (d) Estimate the Paris Law coefficients C and n (assume units of MPa and m) and write out Paris law for this case. (e) Describe the difference between stress intensity factor K, and stress intensity ratio KT. -7 b Log da/dN (m) -13 Log AK (MPa.m¹2) N Consider a large metal plate that has plane strain fracture toughness of 80 MPa mos. The plate is loaded in tension to 500 MPa and then completely unloaded, in a cyclic fashion, once every 5 minutes. Assume that plane strain conditions are met and f=1.0 for stress intensity factor computations. (b) Assuming that the plate should last ten years under this fatigue loading regime, compute the number of fatigue cycles expected during that period. (c) Using Paris law, estimate the maximum allowable initial crack length a, in the unloaded material for it to last 10 years without failure. For this material assume C= 1.62x10-¹2 (assume units of MPa and m) and n=3.2. Now consider the cyclic crack extension vs. stress intensity factor fracture response curve (solid black line) below for a different large plate specimen tested under plane strain conditions. (d) Estimate the Paris Law coefficients C and n (assume units of MPa and m) and write out Paris law for this case. (e) Describe the difference between stress intensity factor K, and stress intensity ratio KT. -7 b Log da/dN (m) -13 Log AK (MPa.m¹2) N
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b Given Plane strain fracture toughness KIc 80 MPam Max cyclic stress max 500 MPa ... View the full answer
Related Book For
Materials Science and Engineering An Introduction
ISBN: 978-0470419977
8th edition
Authors: William D. Callister Jr., David G. Rethwisch
Posted Date:
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