The manufacturer of a product that is subjected to repetitive cycles has specified that the product should be removed from service when any crack reaches 15% of the critical crack length required to cause fracture. Consider a crack that is initially 0.02 mm long in a material with a fracture toughness of 55 MPaÖ The product is continuously cycled between compressive and tensile stresses of 300 MPa at a constant frequency. Assume external cracks for which f=1.12. The materials constant for these units are n = 3.4 and C= 2 X 10-11. What is the critical crack length required to cause fracture? How many cycles will cause product failure?

Elements Of Electromagnetics
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The manufacturer of a product that is subjected to repetitive cycles has specified that the product should be removed from service when any crack reaches 15% of the critical crack length required to cause fracture. Consider a crack that is initially 0.02 mm long in a material with a fracture toughness of 55 MPaÖ The product is continuously cycled between compressive and tensile stresses of 300 MPa at a constant frequency. Assume external cracks for which f=1.12. The materials constant for these units are n = 3.4 and C= 2 X 10-11.

  • What is the critical crack length required to cause fracture?
  • How many cycles will cause product failure?
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