A steel beam with a rectangular cross-sectional area has a height h=30 mm and breadth b=15 mm. It has a through thickness crack of length a=4 mm as shown in the figure. The fracture toughness of the plate material is K_IC =80 MPa m. The beam is subjected to combined tensile and bending loading. If the bending moment applied to the beam is M=600Nm, determine the maximum tensile force which can be applied to the beam before brittle fracture occurs. Give your answer in kN to 3 significant figures.