Question

Problem 1 A component in the shape of a large sheet is to be fabricated from 4340 steel, which has a fracture toughness Kc 989 MPa-m's and a tensile yield,strength of 860 MPa. Ihe sheets are inspected for crack flaws after fabrication, but the inspection device cannot detect flaws smaller than 5 mm. The part is too heavy as designed. An engineer has suggested that the thickness be reduced and the material be heat-treated to increase its tensile strength to 1515 MPa. which would result in decreasing the fracture toughness to 60.4 MPa-m Assuming that the stress level does not exceed one half the yield strength is the suggestion feasible? If not, why not.

Answer 1

Tensale fred Mous we divide the hakemials metnt 2.wilt hav 14 kbu the Crack tens th b? Az느 2