Steel sheets 400 mm wide by 2000 mm long by 2 mm thick are fabricated from SAE 4340 steel, which has a fracture toughness K= 98.9 MPa-m0.5. The sheets are inspected for crack flaws after fabrication, but the inspection device cannot detect flaws smaller than 5 mm. The values of the coefficient and exponent for this material are A= 4 x 10-9 mm [MPa - m¹/2] and cycles n = 3. ▼ Part A Using fracture-mechanics criteria, estimate the minimum potential cycle life of these sheets if they will be subjected to a lengthwise tensile load that continuously varies from 50 to 480 kN. Express your answer using three significant figures. N₁ = ΨΕΙ ΑΣΦ | Η vec ? noview cycles

Elements Of Electromagnetics
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ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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Steel sheets 400 mm wide by 2000 mm long
by 2 mm thick are fabricated from SAE 4340 steel,
which has a fracture toughness
Kc= 98.9 MPa-m0.5. The sheets are inspected for
crack flaws after fabrication, but the inspection
device cannot detect flaws smaller than 5 mm. The
values of the coefficient and exponent for this
material are
-9
mm
A = 4 x 10-⁹ cycles / [MPa¹ - m²/2] and
n = 3.
Part A
Using fracture-mechanics criteria, estimate the minimum potential cycle life of these sheets if they will be subjected to a
lengthwise tensile load that continuously varies from 50 to 480 kN.
Express your answer using three significant figures.
VE ΑΣΦ ↓↑ vec
Nf=
Submit
Request Answer
Return to Assignment
Provide Feedback
***
?
Review
cycles
Transcribed Image Text:Steel sheets 400 mm wide by 2000 mm long by 2 mm thick are fabricated from SAE 4340 steel, which has a fracture toughness Kc= 98.9 MPa-m0.5. The sheets are inspected for crack flaws after fabrication, but the inspection device cannot detect flaws smaller than 5 mm. The values of the coefficient and exponent for this material are -9 mm A = 4 x 10-⁹ cycles / [MPa¹ - m²/2] and n = 3. Part A Using fracture-mechanics criteria, estimate the minimum potential cycle life of these sheets if they will be subjected to a lengthwise tensile load that continuously varies from 50 to 480 kN. Express your answer using three significant figures. VE ΑΣΦ ↓↑ vec Nf= Submit Request Answer Return to Assignment Provide Feedback *** ? Review cycles
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