- #1
patehi
- 11
- 0
Homework Statement
Hi guys, i came across a paper about an Investigation of pencil-lead breaks as acoustic Emission sources by Markus G.R. Sause (it's downloadable everywhere).
The Setup of the Experiment can be seen in the Picture i attached. Now the Problem i have is to find the correct formula on how to find the breaking force of lead, where the elastic modulus and density are defined.
E=10.5 Gpa, ρ=1.78 Mg/m3.
In the table below, the calculated forces are listed in the table "Force (experimental)".
My attempt is to use the formula of Modulus of rupture, E = M.y/I and get the value for Bending Moment. For the sake of example, i am using 0.5 mm Diameter, 60° angle, 4 mm lead length.
Assuming that i am using the correct formula, i calculated the Bending Moment on the System.
This is where i stuck since I am not sure what are all Forces acted on the lead. (Please see my attempt in the attachment).
Homework Equations
Once all Forces are known, use force Equilibrium where Fx=0, Fy=0, M=0.
The Attempt at a Solution
Please see the Images i attached.
Thanks! I appreciate your help!