Recent content by 123321

I worked out the torque of the engine to be 171.89 and then I was going to put it into T/J=τ/r the problem is that J = 2I = Πd^4/32 so do I use 40 mm as the radius or am I supposed to have two unknowns?

1. Normal force, shear force and torsion 2. Normal and shear stress 3. MPa = MN/m^2 so do I divide axial force by the cross-sectional? Then how do I combine it with the tensile/compressive stresses?

OK, thanks Do you know how I should deal with the axial force? Someone previously mentioned that I should deal with the compressive/tensile stress and axial force separately and then combine at the end. I'm confused by this suggestion.

So I've found the max tensile and compressive stresses to be ±54.3 MPa Any clues as to which one is +ve and which one is -ve?

That rings a bell. Thanks

Are they both 30 mm because it is a symmetrical beam? But ones -ve and the other +ve?

Haha! That was embarassing...

I don't have a book and nothing's coming up on Google. :(

Yeah, I'm still confused about the the two y's, for compression and tension. Can anyone explain?

Thanks for answering this question too nvn, I think I'm going to skip the I beam question. I've got no clue. Haha! To convert rpm to rad/sec you times by 2\Pi/60 right? Which give me 523.6 rad/sec. Then multiplying this by the power to give me T, which gives me the same answer.

Homework Statement A solid drive shaft is connected to an engine by a coupling, which has drive pins located on a pitch circle diameter of 80 mm (Note: the diameter of the pitch circle is greater than the diameter of the drive shaft). If the maximum power output of the engine is 90kW at 5000...

Can someone help please? I've been working on this question all day and been getting nowhere...

Nope, never heard of it. How do I find the two bending stresses?

Thanks for the quick replies guys! So from you's have said, am I right to say that the y for compression is 30 mm? How about the y for tension? Will it also be 30 mm because it is symmetrical? I've never heard of axial stress, is it the same as torsion? I'm so confused...

Homework Statement A symmetric I section beam is 60 mm deep with a second moment of area of 663x10-9 m^4 and a cross sectional area of 1600 mm^2. It is subject to a bending moment of 1.2 kN.m and an axial force of 25 kN (tension). Find the maximum tensile and compressive stresses.Homework...