Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal cr...
Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 x 10-4 mm (10-5 in.) and a crack length of 2.5 x 10-2 mm (10-3 in.) when a tensile stress of 170 MPa (25,000 psi) is applied? 2. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 55 MPa m (50 ksi in.). If the plate is exposed to a tensile stress of 200 MPa (29,000 psi) during service use, determine the minimum length of a surface crack that will lead to fracture. Assume a value of 1.0 for Y Chapter 10 Cite three variables that determine the microstructure of an alloy 2. Give for the germanium-silicon system. Construct the phase diagram for this system and label each region. n here are the solidus and liquidus temperatures Composinion Selidus 938 1005 1065 1123 1178 232 1282 1326 1359 1390 1414 1147 1226 io 30 1315 346 367 T3RS 397 50 70 100 414
Chapter 9 1. What is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 2.5 x 10-4 mm (10-5 in.) and a crack length of 2.5 x 10-2 mm (10-3 in.) when a tensile stress of 170 MPa (25,000 psi) is applied? 2. A large plate is fabricated from a steel alloy that has a plane strain fracture toughness of 55 MPa m (50 ksi in.). If the plate is exposed to a tensile stress of 200 MPa (29,000 psi) during service use, determine the minimum length of a surface crack that will lead to fracture. Assume a value of 1.0 for Y Chapter 10 Cite three variables that determine the microstructure of an alloy 2. Give for the germanium-silicon system. Construct the phase diagram for this system and label each region. n here are the solidus and liquidus temperatures Composinion Selidus 938 1005 1065 1123 1178 232 1282 1326 1359 1390 1414 1147 1226 io 30 1315 346 367 T3RS 397 50 70 100 414