Question

can you explain how they got 80 ksi (engineering materials)

3. A 4340 steel plate tempered at 425C has a notched edge. The crack geometry results in a Y value of 1.32. If the notch is 0.15" deep, what is the maximum stress allowed? =Yo Uta K=go ksi vin Yra soksi va 1.32 VI. oisin o = 88.29 Esi

Answer 1

From standard text books and tables

ksiVin. Tablc 9,1 Room. Temperature Yield Strength and Plane Strain Fracture Toughness Data for Selected Engineering Materials Yield Strength Material MPa kui kui MPa Vm MPaVm Metals Aluminum Alloy 195 (7075-T651) Aluminum Alloy 345 (2024-13) Titanium Alloy 910 (Ti-6Al-V) Alloy Steel 1640 238 50,0 (43-10 lempered @ 2600) Alloy Sicer 1420 206 (43-40 le mpered @ +250) 5.8 B010 Ceramics Concrete Soda-Lime Glass = = 0.2-1.4 07-08 uz list 0.181:37 0.18-1.27 (6 73

The stress concentration factor is known by flaw edge value and y value

Since in question it is given 4340 steel with tempered at 425C which is a standard as you can highlighed text in picture