A circle of diameter ? = 9 ?? is scribed on an unstressed aluminum plate of thickness ? = 0.75 ?? as shown in Figure B4. Forces acting in the plane of the plate later cause normal stresses ?? = 12 ?? and ?? = 20 ??. For ? = 10  10? ?? and ? = 0.33, determine the change in: (a) the diameter AB. [9 marks] (b) the length of diameter CD. [8 marks] (c) the thickness of the plate.

Question 2 [25 marks] A circle of diameter d = 9 mm is scribed on an unstressed aluminum plate of thickness t = 0.75 mm as shown in Figure B4. Forces acting in the plane of the plate later cause normal stresses x = 12 Pa and = 20 Pa. For E = 10 x 106 Pa and v = 0.33, determine the change in: (a) the diameter AB. (b) the length of diameter CD. (c) the thickness of the plate. [9 marks] [8 marks] [8 marks] UNIT CIS106-2/22-23/Sem 1/Resit Paper Page 3 of 5 N y 15 mm A D C B 15 mm 0x x Figure B2.