Introduction to Materials, Tribology and Surface Engineering Question 1 1 - Distinguish between fracture toughness KC and plane strain fracture

2 - Fracture toughness tests were carried out on three-point bend specimens made of an aluminium alloy (yield strength σys = 435 MPa). The K-calibration for the three point bend specimen is: K= For a particular test, the following results were obtained from test piece measurements: a = 17.95 mm, W = 35.10 mm, B = 12.70 mm and S = 4W. From the load-displacement curve, PQ = 5.70 kN, Pmax =6.13 kN and S = 4W. Determine whether the test represents a valid KIC test.?? (10marks)