Hi all ,
This is my first thread here . I'm an aeronautical engineering student who is doing a project about building and optimizing the main landing gear strut for a 25 kg twin boom UAV .I have some questions that I hope to hear your opinion about :
First : after calculating the wheel track and the strut height I had two choices for the strut, the curve and the straight , and I found that both of them are widely used in the UAV industry . the forces and moment acting on the strut are the same in both cases ,but the straight one should be lighter ( I guess )
onder: .
Second : the main stresses on the strut are compression and tension so I thought that a unidirectional fiber can handle those stresses best , so the main part of the strut should be made out if UD fibers and I decided to add some +45\-45 layers to deal with any shear stresses .
According to my calculations the UD fibers should be in the in both outer sides of the strut and the+45/-45 fabric layers should in the middle ,and while I was searching the internet I found this :
http://www.emp.edu.dz/Manif_Scientifique/OTEH2012/elementi/rad/2-01.pdf
In this paper the stacking sequence was the opposite, I mean that the UD fiber were in the middle and the +45/-45 fabric layers were outside why ǃǃ:depressed
what is the right stacking sequence ǃ
Third : I intend to use vacuum bagging in the building process ,and I wonder what is the maximum thickness that I can use this method in .
If there is any similar study about this project its gonna be a great help.
thanks
This is my first thread here . I'm an aeronautical engineering student who is doing a project about building and optimizing the main landing gear strut for a 25 kg twin boom UAV .I have some questions that I hope to hear your opinion about :
First : after calculating the wheel track and the strut height I had two choices for the strut, the curve and the straight , and I found that both of them are widely used in the UAV industry . the forces and moment acting on the strut are the same in both cases ,but the straight one should be lighter ( I guess )
onder: .Second : the main stresses on the strut are compression and tension so I thought that a unidirectional fiber can handle those stresses best , so the main part of the strut should be made out if UD fibers and I decided to add some +45\-45 layers to deal with any shear stresses .
According to my calculations the UD fibers should be in the in both outer sides of the strut and the+45/-45 fabric layers should in the middle ,and while I was searching the internet I found this :
http://www.emp.edu.dz/Manif_Scientifique/OTEH2012/elementi/rad/2-01.pdf
In this paper the stacking sequence was the opposite, I mean that the UD fiber were in the middle and the +45/-45 fabric layers were outside why ǃǃ:depressed
what is the right stacking sequence ǃ
Third : I intend to use vacuum bagging in the building process ,and I wonder what is the maximum thickness that I can use this method in .
If there is any similar study about this project its gonna be a great help.
thanks
