Recent content by Ma77h3w

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    Effect of tension on torsional stiffness

    I'm only interested in loads where the material is performing in it's linear stress/strain region. I suppose this is a different thing than the FEA linear (small displacement) model? Typically the shaft will twist a couple of degrees given a certain torque. If an axial load is applied in Ansys...
  2. M

    Effect of tension on torsional stiffness

    So say I have a steel pipe under a torque and an axial load. I want to know whether the axial load has any effect on the twist due to torque. Have one calculation which (perhaps falsely) assumes the pipe is made of lots of axially running "wires" and calculates the torque due to this axial...
  3. M

    Classical Mechanics Problem

    P.S. force from spring = k( x1- x2) which is the bit that may have confused you
  4. M

    Classical Mechanics Problem

    I've not done this for a while.. but.. resolve the forces around the mass M I get something like (cant get latex thing workings so decript!) m(x''2) - G(x'2) + k(x1 - x2) = 0 then you know x1 is a function of time f(t) so this can be substituted in for x1 i believe then rearrange so f(t)...
  5. M

    Aerofoil analysis, CFD and Experimental comparison

    Homework Statement Computational Fluid Dynamics anyone? :D I know someone out there is a genius? I'm trying to understand some of the differences between Experimental results and a Fluent (CFD) analysis of a NACA 0012 aerofoil. There are 3 Cp/x graphs of my results (plotted with negative down...
  6. M

    Total pressure and Static Pressure and V

    I'm not sure, I don't have access to the experiment anymore. What difference would using a pito static tube make? Can the Dynamic pressure (Pt - Ps) be negative in this situation? And am I allowed to swap them around (Ps - Pt) to work out the freestream velocity? All the other pressure tappings...
  7. M

    Total pressure and Static Pressure and V

    Confusion... I'm probably being stupid but... Aerofoil in a wind tunnel... there are lots of pressure tappings including Pt and Ps (static and total pressure freestream) these are currently in mm on a manometer.. my Pt is 11.4mm and Ps is 16.8mm.. (SG=0.8) 1st question: Should total...
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