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  1. J

    Principal stress?

    So I have been trying to look at this again today. I have the principal stress formula but as we are not using x and y I take it we are using the zz, theta z & theta theta values. I'm sorry but I just can't see how these values factor into the formula.
  2. J

    Principal stress?

    Damn I thought I had it then. So all I need to do know is find the right formula to input these values into.
  3. J

    Principal stress?

    This is so frustrating I am only seeing the 2 values in the question so I'm assuming one value is 0. Is zz 100MN/m2 and theta theta -45MN/m2 and z theta 0. I'm pulling my hair out trying to get my head round This.
  4. J

    Principal stress?

    I believe I do. Is theta going around the surface with z going through the axle. I had a look online and think this is what I am seeing.
  5. J

    Principal stress?

    I may be barking up the wrong tree here but if we are using the z axis then isn't this a 3D analysis. I am currently only doing 2D analysis so do the Compressive stress of 100 MN/m2 and the shear stress of -45MN/m2 only apply to the x and y axis with 100MN/m2 being on the y axis. The notes i...
  6. J

    Principal stress?

    ah sorry I didn't know it was unreadable. here goes. An axle of a go kart is loaded in such a way that on a surface plane aligned circumferentially a direct compressive stress of 100MN/m2 is applied. In association with the compressive stress is a shear stress applied from the driving torque...
  7. J

    Principal stress?

    ok i'm starting to see where things fit in. if I may clarify then σy is compressive stress 100MN/m2 and sheer stress is τxy -45MN/m2, but what value is σx. the question states "on a plane perpendicular to the one carrying the compressive stress only complementary shear exists" this I am...
  8. J

    Principal stress?

    Ok all the questions I have seen online all specify the 3 values required but in the question I have been given I only had the 2 values. could you possibly tell me if in the question I am missing some information I require as I cant believe my tutor would make it this difficult at the start of...
  9. J

    Principal stress?

    Hi Chet Rather than me say everything I had better take it a step at a time, so here goes. Question 1. when it comes to determining the principal stress I haven't got any real clear guidance in the notes I have (or I just cant see it). can I assume that σy = 100MN/m2 and that σx = -45MN/m2...
  10. J

    Principal stress?

    HI everybody I am in dire need of help. I have started a mechanical systems module as part of a distance learning foundation degree. The notes seem quite sparse to me and I can't seem to get to grips with it from the start. I have attached a photo of the tutorial questions but the are no...
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