legend! thank you sir. Im 17 and I've got my first scientific poster event, where I am presenting langendorffs experiment, and this video has relieved a lot of stress. God bless you
Thank you Dr, for nice presentation. Am trying to go with your flow but when i insert the text in the texboxes.the texts becomes of very low size , not seen even after increasing the size to 28. Help me
Thank you very much, Dr. Michael, for these good lectures. I have a question. How do I determine the volumetric fraction of two materials in the case of preparing a slide or layer consisting of polymeric material and fibers at rates of 30% and 70% in the Abaqus program? Is there an explanatory video available?❤❤❤❤
Hello, thanks for your comment. I am a bit unsure about what the question is about. If you want to determine the volume fraction of two materials (composites), you can do so by finding the weight contribution of each of the phases that make up the system. The weights of say E-glass fibre and the weight of the matrix, say Epoxy. With those weights, you define the weight fractions. You also need to know the densities of the constituents that make up the composite. If you want to see how to make the conversions, a quick google search will help you as you can see from here: sites.google.com/site/compositematerialsdesign/home/weight-and-volume-fractions. I am not sure if this is what you are looking for. Good luck with the research.
Thank you very much Dr. Michael I am very grateful to you for your answer I am very interested in your valuable lectures My question is in the picture attached to this message about how to determine the value (percentage %) for each material in the preparation of the composite material, whether layer, slice or cube. That is, anywhere in the choices of the Abacus program when we specify these values, that is, when we limit the dimensions and density, and with what Young's modulus and the Poisson's Modulust, because I searched a lot and did not find anyone who explained it. Where I noticed that in the video I posted, the value of polypropylene was 40% and fiber was 60%, how did this happen? This is in the case of two materials, but if it is three materials, it means two solid materials with a polymeric material, and I hope that you will help me with it, and I am very grateful to you
I understand the question now. With regards to the volume fraction of the fibre and matrix constituents, you have to determine this yourself when you design the composite. It is a volume fraction that means in creating the geometry, you have to decide how much of the volumetric space (virtual domain) is going to be occupied by the fibre and how much by the matrix. The volume fraction of 40% fibre means that only 40% of the volume will be occupied by the fibre. How do you then prepresent this? So, if you have a space of 100 x 100 x 100 overall for the composite, you ahve to find how many fibres will occupy the fibre to give you a 40% volume fraction. You have to make some calculations and if you look at my videos on RVE modelling of UD composites, you will see how to do the calculations. If the calculation shows that 5 fibres are required (for example), then you make sure in the 100x100x100 space, you create cylinders that represent the fibres based on their radius that will cover 40% of the volume. The remaining space will then be 60% which is the matrix. For a three-constituent system, the same things holds. Clearly, where you need to get the percentages i.e. 40% and 60% will come from a manufacturer's data sheet for the material you are using. In the case of the videos you refer to, I got them from the publication referred in the video which stated what percentage is the volume fraction for the fibre (E-glass) and the matrix (polypropylene). For the system you are testing, please find those percentages yourself. If you do not have it, then you can decide how you want to give percentages to the parts provided all of them add up to 100%. That is my suggestion.
