You are designing a 200mm long x 100mm wide x 50mm deep rectangular housing, with a...

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You are designing a 200mm long x 100mm wide x 50mm deep rectangular housing, with a wall width of 1.5 mm, and 1 degree draft. You wish to eject by pushing on the inner bottom surface, near the walls (through the core) with pins no bigger than 3 mm diameter. The coefficient of friction is predicted to be 0.5. The material specified is Inspire 702 polypropylene, which has a modulus of 1740 MPa, a yield strength of 21 MPa, a solidification temp of 176C, a ejection temperature, DTUL, of 80C. Its coefficient of thermal expansion is 9.5e-5 m/m-C. The overall length of the pins are 300 mm and the pin material material has modulus of 200 GPa. What is the minimum amount of pins required? Note, the fatigue limit stress of the pin material is 450 MPa. (50 pts) You are designing a 200mm long x 100mm wide x 50mm deep rectangular housing, with a wall width of 1.5 mm, and 1 degree draft. You wish to eject by pushing on the inner bottom surface, near the walls (through the core) with pins no bigger than 3 mm diameter. The coefficient of friction is predicted to be 0.5. The material specified is Inspire 702 polypropylene, which has a modulus of 1740 MPa, a yield strength of 21 MPa, a solidification temp of 176C, a ejection temperature, DTUL, of 80C. Its coefficient of thermal expansion is 9.5e-5 m/m-C. The overall length of the pins are 300 mm and the pin material material has modulus of 200 GPa. What is the minimum amount of pins required? Note, the fatigue limit stress of the pin material is 450 MPa. (50 pts)

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