A conventional composite fan blade has an ultimate tensile strength σUTS = 2762 MPa, fracture toughness KIC = 60 MPa m0.5 , KIIC = 46.1 MPa m0.5 da/dN = 2.1x10-32(ΔK )3.2 where da/dN is in m/cycle and ΔK in MPa m0.5 , and fatigue limit σt = 527 MPa. A student is conducting a fatigue test using R = 0.5 in the lab to emulate the service condition on the airplane. Please answer the questions corresponding to different conditions below. (round all answers to 2 decimal digits when applicable) [30 Marks] a) Please calculate the maximum stress amplitude (unit: MPa) that the fan blade can withstand without failure.
A conventional composite fan blade has an ultimate tensile strength σUTS = 2762 MPa, fracture toughness KIC = 60 MPa m0.5 , KIIC = 46.1 MPa m0.5 da/dN = 2.1x10-32(ΔK )3.2 where da/dN is in m/cycle and ΔK in MPa m0.5 , and fatigue limit σt = 527 MPa. A student is conducting a fatigue test using R = 0.5 in the lab to emulate the service condition on the airplane. Please answer the questions corresponding to different conditions below. (round all answers to 2 decimal digits when applicable) [30 Marks] a) Please calculate the maximum stress amplitude (unit: MPa) that the fan blade can withstand without failure.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
A conventional composite fan blade has an ultimate tensile strength σUTS = 2762 MPa, fracture toughness KIC = 60 MPa m0.5 , KIIC = 46.1 MPa m0.5 da/dN = 2.1x10-32(ΔK
)3.2 where da/dN is in m/cycle and ΔK
in MPa m0.5 , and fatigue limit σt = 527 MPa. A student is conducting a fatigue test using R = 0.5 in the lab to emulate the service condition on the airplane. Please answer the questions corresponding to different conditions below. (round all answers to 2 decimal digits when applicable) [30 Marks]
a) Please calculate the maximum stress amplitude (unit: MPa) that the fan blade can withstand without failure.
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