A specimen of a 4340 steel alloy having a plane strain fracture toughness of 45 MPAVM (41 ksi Vin.). is exposed to a stress of 1000 MPa (145,000 psi). Will this specimen experi- ence fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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A specimen of a 4340 steel alloy having_a
plane strain fracture toughness of 45 MPa Vm
(41 ksiVin.). is exposed to a stress of 1000
MPa (145,000 psi). Will this specimen experi-
ence fracture if it is known that the largest
surface crack is 0.75 mm (0.03 in.) long? Why
or why not? Assume that the parameter Y has
a value of 1.0.
Questions
Suppose that a wing component on an air-
craft is fabricated from an aluminum alloy
that has a plane strain_fracture toughness of
40 MPAVM (36.4 ksi Vin.). It has been deter-
mined that fracture results at a stress of 365
MPa (53,000 psi) when the maximum internal
crack length is 2.5 mm (0.10 in.). For this same
component and alloy, compute the stress level
at which fracture will occur for a critical in-
ternal crack length of 4.0 mm (0.16 in.).
Transcribed Image Text:A specimen of a 4340 steel alloy having_a plane strain fracture toughness of 45 MPa Vm (41 ksiVin.). is exposed to a stress of 1000 MPa (145,000 psi). Will this specimen experi- ence fracture if it is known that the largest surface crack is 0.75 mm (0.03 in.) long? Why or why not? Assume that the parameter Y has a value of 1.0. Questions Suppose that a wing component on an air- craft is fabricated from an aluminum alloy that has a plane strain_fracture toughness of 40 MPAVM (36.4 ksi Vin.). It has been deter- mined that fracture results at a stress of 365 MPa (53,000 psi) when the maximum internal crack length is 2.5 mm (0.10 in.). For this same component and alloy, compute the stress level at which fracture will occur for a critical in- ternal crack length of 4.0 mm (0.16 in.).
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