You may be right about the time, I haven't worked it through. But I don't need to know a time for the equations for work-energy just the energy and the distance.
I did explain to the client that the smaller the contact area the higher the stress, he was happy with a simplified approach using a...
Although I have just thought about the -ve sign, you are correct. I have been inconsistent with my force system the forces acts in a negative direction, therefore
v = - (-W)L/48EI
which means the sign convention issue is resolved.
Thanks rb1957
I had investigated calculating the using F = mass x acceleration. But I considered estimating the time of deceleration too inaccurate. That is why I decided to use the work energy-method. I thought I would be able to calcualte max deflection based on max allowable stress. And then...
I will try and keep this brief
I'm trying to calculate the force on impact of a tile falling onto a glass roof using the work-energy method. I understand that there many many unknown variables and I have expalined this to the client and he requested simplified results anyhow.
I know the...