from an aluminum alloy that has a plane strain fracture toughness of 45 MPa m and a yield strength of 500 MPa.  It has been determined that fracture results at a stress of 250 MPa when the maximum internal crack length is 9 mm.  For this same component and alloy, determine critical internal crack length that will result to fracture if the design stress is three-fourth of the yield strength.  If the available flaw detection apparatus has a resolution limit of 3 mm, will the crack in (1) be detected? Why or why not? Show complete solution

Elements Of Electromagnetics
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An aircraft component is to be fabricated from an aluminum alloy that has a plane strain fracture toughness of 45 MPa m and a yield strength of 500 MPa.  It has been determined that fracture results at a stress of 250 MPa when the maximum internal crack length is 9 mm. 

  1. For this same component and alloy, determine critical internal crack length that will result to fracture if the design stress is three-fourth of the yield strength. 
  2. If the available flaw detection apparatus has a resolution limit of 3 mm, will the crack in (1) be detected? Why or why not?

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