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8. A high strength steel plate (Figure 7-21), which has a plane strain fracture toughness of 80 MPa?m is alternately loaded in tension to 500 MPa and in compression to 60 Mpa. The plate is to survive for 10 years with the stress being applied at a frequency of once every 5 minutes. Design a manufacturing and testing procedure that ensures that the component will serve as intended. Assume a geometry factor f=1 for all flaws. Figure 7-21 Crack growth rate versus stress intensity factor range for a high-strength steel. For this steel, C = 1.62 × 10?¹² and n = 3.2 for the units shown. Power law behavior da/dN = C(?K)? No crack growth Rapid unstable crack growth Slow crack growth 10?? 10?? 10?? 10?? 10?? 10?¹? Crack growth rate (m/cycle) 0.4 0.8 100 Stress-intensity factor range ?K (MPa ?m)

          8. A high strength steel plate (Figure 7-21), which has a plane strain fracture toughness of 80 MPa?m is alternately loaded in tension to 500 MPa and in compression to 60 Mpa. The plate is to survive for 10 years with the stress being applied at a frequency of once every 5 minutes. Design a manufacturing and testing procedure that ensures that the component will serve as intended. Assume a geometry factor f=1 for all flaws. Figure 7-21 Crack growth rate versus stress intensity factor range for a high-strength steel. For this steel, C = 1.62 × 10?¹² and n = 3.2 for the units shown. Power law behavior da/dN = C(?K)? No crack growth Rapid unstable crack growth Slow crack growth 10?? 10?? 10?? 10?? 10?? 10?¹? Crack growth rate (m/cycle) 0.4 0.8 100 Stress-intensity factor range ?K (MPa ?m)

$8. A high strength steel plate (Figure 7-21), which has a plane strain fracture toughness of 80 MPa?m is alternately loaded in tension to 500 MPa and in compression to 60 Mpa. The plate is to survive for 10 years with the stress being applied at a frequency of once every 5 minutes. Design a manufacturing and testing procedure that ensures that the component will serve as intended. Assume a geometry factor f=1 for all flaws. Figure 7-21 Crack growth rate versus stress intensity factor range for a high-strength steel. For this steel, C = 1.62 × 10?¹² and n = 3.2 for the units shown. Power law behavior da/dN = C(?K)? No crack growth Rapid unstable crack growth Slow crack growth 10?? 10?? 10?? 10?? 10?? 10?¹? Crack growth rate (m/cycle) 0.4 0.8 100 Stress-intensity factor range ?K (MPa ?m)$

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