Recent content by Aerstz

Thanks. Judging by the information in these links, my calculation is about five-times out. What confuses me is that the formula I used I took from a report I produced years ago, and I cannot recall where it came from, and I am unable to find it anywhere online (I even asked an AI bot). In my...

A load of 100 kg acting in the axial direction is applied to a nut coupled with a standard M10 bolt. The nominal thread diameter is 10 mm; pitch is 1.5 mm. Thus, the stress acting on a single thread in the bolt is: 1000 N / (0.25 * pi * (10 mm - 0.93194 * 1.5 mm)^2) ≈ 17.21 MPa 17 MPa seems...

Thank you. This is what I was thinking but not knowing for sure I had to be prudent and assume the worst. I'm grateful for your reply. I would still be interested in reading any study on the toxicity of dust/particles of the dried lacquer should anyone be able to link to one. I haven't been...

I am not a chemist but do have a concern regarding a coating that is applied to a linoleum flooring product likely soon to be used in my bedroom. Linoleum is the least toxic flooring type I could identify, suitable for the room in question. However, despite being made of 'natural' materials...

Thank you once again. Your reply to me is just the sort of thing I want to read in the textbooks, yet it is nearly always missing and so I often learn little from them. Perhaps I've just been reading the wrong books!

Thank you. It was kind of you to post that, and I appreciate it. Apologies for not replying more promptly but I had a couple of deadlines to meet and my mind was away from the matrix problem for a day or two. Now my mind is back on this issue I am much more confident but stuck at the final...

Thank you very much. I'm assuming your post is based on my AA = AA1 + AA2 and not just the matrix image I posted! I very much appreciate your confirmation.

Homework Statement Combine five element matrices into single matrix forming a global stiffness matrix for simple truss analysis (five elements, four nodes). Homework Equations -See attached image- The Attempt at a Solution Where the four sub-matrices overlap in the global matrix...

Homework Statement Calculate stress in a curved beam and compare with FEA model. Homework Equations Stress = (M*(r-rn))/(Aer) The Attempt at a Solution I used the above formula, which is repeated in many textbooks and reputable engineering websites, to calculate stress in a...

Thanks. I was resigned to just using the centripetal formula despite reading elsewhere that there are two force components: tangential and centripetal.

Homework Statement A capsule suspended on flat rails enters a curve in a pipeline. It has guide wheels on vertical axles to keep the main wheels on-track. As it enters the bend the front guide wheel impacts the side of a rail to steer the bogie. What is the force of this impact? Essentially...

Thanks. I've since found a couple of equations for impact stress and deflection, based on strain energy.

Homework Statement A vehicle falls 20 mm back onto a smooth steel track after going over a bump. It has polyurethane wheels. Young's modulus is known for both wheels and track materials. What is the force exerted by the vehicle onto the track as it lands? Homework Equations F = mdv/dt KE =...

Never mind, I found my error. I failed to include the negative power value when calculating torque. Torque is 5.7*10^-5, not 5.7! Therefore the force required to push the wheel is just 1.14 * 10^-3 N, which makes much more sense. Feel free to delete this thread.

Homework Statement How much force is required to push a wheel of radius 50 mm and moment of inertia 3.21*10^-4 kgm^2 to 20 mph in 5 seconds? The wheel has a mass of 0.29 kg. The wheel is to be pushed straight and level at its axel 90 degrees to the horizontal. Homework Equations T =...