Question

'A specimen of a ceramic material with Youngs modulus (E) of 25 x 10" MPa is pulled in tension to a stress of 750 MPa: We can assume that the critical stress (0 critical) required for crack propagation in this case is 25 GPa, which is one tenth of its Youngs modulus. (a) Will the specimen fail if it contains an internal crack with the length of 0.75 mm and tip radius of curvature of 0.001 mm?a (b) What is the maximum tension stress can be applied to the specimen without any failure or fracture if we have the same internal crack with the length of 0.75 mm and tip radius of curvature of 0.001 mm? (c) What is the maximum length of the internal crack with a tip radius of curvature of 0.001 mm can be allowed without any failure or fracture for a tensile test with a tension stress of 750 MPa?'

          'A specimen of a ceramic material with Youngs modulus (E) of 25 x 10" MPa is pulled in tension to a stress of 750 MPa: We can assume that the critical stress (0 critical) required for crack propagation in this case is 25 GPa, which is one tenth of its Youngs modulus. (a) Will the specimen fail if it contains an internal crack with the length of 0.75 mm and tip radius of curvature of 0.001 mm?a (b) What is the maximum tension stress can be applied to the specimen without any failure or fracture if we have the same internal crack with the length of 0.75 mm and tip radius of curvature of 0.001 mm? (c) What is the maximum length of the internal crack with a tip radius of curvature of 0.001 mm can be allowed without any failure or fracture for a tensile test with a tension stress of 750 MPa?'

Added by Marc P.

Question

Please give Ace some feedback