- #1
M_Abubakr
- 10
- 1
- TL;DR Summary
- My final year project dealing with how the microstructure of composite can have an effect on vibration properties of the system.
This project is stressing me out along with other workload and I'm in panic mode right now. The brief of the project is in the attachment.
I can interpret 4 objectives out of this:
(1) Analysing the relation of the physical parameters in the composite material with the characteristics of wave propagated within a cell of fibre-matrix.
(2) Analysing the effect of the degree of reflection, refraction and propagation of elastic waves within the fibre-matrix interface on the vibration response of the single ply of composite laminate.
(3) Introducing of geometric alterations within the fibre structure to increase fibre-matrix interface fracture energy.
(4) Introducing fibre interlocking mechanisms to increase fibre-matrix interface strength.
The types of vibrations experienced by the composite material will be harmonic. The type of composite is upto choice and I'm choosing carbon fibre-Epoxy. I know the analysis will be started with SDOF by analysing the unit cell. The shape of the individual fibre within the unit cell will look something like this. D, theta and L. D is the diameter of the fiber, theta is the angle and L is the distance between the two consecutive extrusions. I have to determine how does changing these parameters will effect the wave characteristics of the composite and also what effect will the change in fibre direction will have?
.
My first question is, How do I achieve this first step? Of course I'll have to design this thing in CAD and then import it to ANSYS. That's one part of it. But how would I prove my calculations? What equations would I have to use? I know equations of motion for vibrations in 1D with mass spring and damper systems etc. but this? In 3D? This is beyond me. What mathematical Model will be best to carry out this analysis?
My Second question is, Once I have carried out this thorough analysis of unit cell, I would have to move from SDOF to Multiple degree of freedom. How would I achieve this? Through Fourier series? Of-course I will end up with multiple unit cells in a single ply of composite sheet and the whole sheet will be vibrating with its own frequency which will be made up of individual frequencies of multiple unit cells. But I have no idea what to do in this part. I'm probably writing BS and there will be lots of reflection and refraction going on within the material leading to superposition of incident and reflected waves which too will take effect and cause interference.
So far this will do. I will have more questions once I'm done with above stuff. Anyways, does anyone have any recommended books or literature on this topic I haven't been able to find a single piece of info that will help me get started in my analysis.
I can interpret 4 objectives out of this:
(1) Analysing the relation of the physical parameters in the composite material with the characteristics of wave propagated within a cell of fibre-matrix.
(2) Analysing the effect of the degree of reflection, refraction and propagation of elastic waves within the fibre-matrix interface on the vibration response of the single ply of composite laminate.
(3) Introducing of geometric alterations within the fibre structure to increase fibre-matrix interface fracture energy.
(4) Introducing fibre interlocking mechanisms to increase fibre-matrix interface strength.
The types of vibrations experienced by the composite material will be harmonic. The type of composite is upto choice and I'm choosing carbon fibre-Epoxy. I know the analysis will be started with SDOF by analysing the unit cell. The shape of the individual fibre within the unit cell will look something like this. D, theta and L. D is the diameter of the fiber, theta is the angle and L is the distance between the two consecutive extrusions. I have to determine how does changing these parameters will effect the wave characteristics of the composite and also what effect will the change in fibre direction will have?
.
My first question is, How do I achieve this first step? Of course I'll have to design this thing in CAD and then import it to ANSYS. That's one part of it. But how would I prove my calculations? What equations would I have to use? I know equations of motion for vibrations in 1D with mass spring and damper systems etc. but this? In 3D? This is beyond me. What mathematical Model will be best to carry out this analysis?
My Second question is, Once I have carried out this thorough analysis of unit cell, I would have to move from SDOF to Multiple degree of freedom. How would I achieve this? Through Fourier series? Of-course I will end up with multiple unit cells in a single ply of composite sheet and the whole sheet will be vibrating with its own frequency which will be made up of individual frequencies of multiple unit cells. But I have no idea what to do in this part. I'm probably writing BS and there will be lots of reflection and refraction going on within the material leading to superposition of incident and reflected waves which too will take effect and cause interference.
So far this will do. I will have more questions once I'm done with above stuff. Anyways, does anyone have any recommended books or literature on this topic I haven't been able to find a single piece of info that will help me get started in my analysis.
