(c) The thin rectangular plate shown in Figure Q3.1 has a step change in height from b = 75 mm to b = 50 mm with a fillet radius a = 5mm. The thickness of the plate is t = 1 mm. The relationships between stress concentration factor Kt and normalised fillet radius r/d for a rectangular bar with fillet under axial Stress concentration factor, K+ 1.5 0 load are shown in Figure Q3.2. Given that the maximum allowable stress of the plate material is allow= 275 MPa, determine the maximum axial load P that can be applied to the plate. 2.5 2 D/d=1.8 D/d=1.5 D/d = 1.2 - bi b Figure Q3.1 t d th 0.05 0.1 0.15 0.2 0.25 r/d