Dear Dr. Okereke, Thank you for your wonderful and informative videos. I have a question, As I have been following your work, I realized that for calculating the Young's modulus you consider the displacement in one direction for instance U1 and then calculate the strain based on the length it is being deformed in. In your video for calculating the Poisson's ratio in lattice structure material and also a 2D composite you consider a set of nodes or a single node to calculate the displacement in one direction like U1 and the transverse in U2 to get the Poisson ratio, My question is; Why would you consider a node displacement in field output for Poisson's ratio and not the set of RP that was considered before? Thank you for your time and help regarding this matter.
Good question. The reason is that in extracting poisson ratio, you need two displacement (or strain measurements) i.e. u1 (along direction of loading) and u2 (transverse to direction of loading). These need to be extracted at different points in the model i.e. u1 from the node in direction of loading and u2 (on a node at the y-axis, transverse direction of loading). As I have only one RP i.e. at U1, then that gives me the displacement there. To get that of U2, I can do it two ways: 1. Use field output to track that (as displacement is always available for every note in the model) OR 2. Introduce another RP at that node and track it similarly. I decided on the first one, as I wanted students to be able to extract poisson ratio easily with their normal tensile simulations as u1 will always be there. You can then go to an applicable node to extract u2 from a field output. This way, you do not have to specially setup the model for poisson ratio by introducing an RP node. I hope the explanation makes sense.
It is not clear to me, the question. You can model fibres as unidirectional, but as spherical inclusions, you cannot except maybe for another type of material.
Dear Dr. Okereke,
Thank you for your wonderful and informative videos.
I have a question,
As I have been following your work, I realized that for calculating the Young's modulus you consider the displacement in one direction for instance U1 and then calculate the strain based on the length it is being deformed in. In your video for calculating the Poisson's ratio in lattice structure material and also a 2D composite you consider a set of nodes or a single node to calculate the displacement in one direction like U1 and the transverse in U2 to get the Poisson ratio,
My question is;
Why would you consider a node displacement in field output for Poisson's ratio and not the set of RP that was considered before?
Thank you for your time and help regarding this matter.
Good question.
The reason is that in extracting poisson ratio, you need two displacement (or strain measurements) i.e. u1 (along direction of loading) and u2 (transverse to direction of loading).
These need to be extracted at different points in the model i.e. u1 from the node in direction of loading and u2 (on a node at the y-axis, transverse direction of loading).
As I have only one RP i.e. at U1, then that gives me the displacement there. To get that of U2, I can do it two ways:
1. Use field output to track that (as displacement is always available for every note in the model)
OR
2. Introduce another RP at that node and track it similarly.
I decided on the first one, as I wanted students to be able to extract poisson ratio easily with their normal tensile simulations as u1 will always be there. You can then go to an applicable node to extract u2 from a field output. This way, you do not have to specially setup the model for poisson ratio by introducing an RP node.
I hope the explanation makes sense.
Hello.dr.i can take polypropylene fiber. Like spherical inclusion.and i modify
It is not clear to me, the question. You can model fibres as unidirectional, but as spherical inclusions, you cannot except maybe for another type of material.