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SOLVED:A circular rod 120  mm in diameter contains a circumferential surface crack, as in Fig. 8.14. The material is the ferritic-pearlitic structural steel ASTM A572 with yield strength σo=345 MPa and plane stress fracture toughness in this thickness of at least KI c=100 MPa √(m). What force range ΔP, applied at R=0.4, will cause the crack to grow from ai=1.0  mm to af=12  mm in 500,000 cycles?
SOLVED:A circular rod 120  mm in diameter contains a circumferential surface crack, as in Fig. 8.14. The material is the ferritic-pearlitic structural steel ASTM A572 with yield strength σo=345 MPa and plane stress fracture toughness in this thickness of at least KI c=100 MPa √(m). What force range ΔP, applied at R=0.4, will cause the crack to grow from ai=1.0  mm to af=12  mm in 500,000 cycles?
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