IAmMatt
Guest
hello to all, I joined the forum hoping that someone can help me find a solution (because my rapporteur and his assistant created a thesis, thinking that it was very simple to carry out the intermediate steps, but obviously now they do not know which side to knock down the head ... and what remains screwed in the meantime is me 
).
then, the thesis is based on the study of the interactions between the moncone of a transfemoral amputate, and the invasiveness of the prosthesis to try to understand whether numerical modeling, can give realistic results, so that possibly work in the future on a parameterization of the shape of the invaded, based on anthropometric and biomechanical data of the tissues.
the problem is this:
1) the invasive of the prosthesis comes from a laser scan acquisition of a prototype created in reverse starting from a true prosthesis, and is saved as superficial mesh (.stl)
2) the "forms" of the hypothetical patient amputated, arrive from visible human dataset (cadaveri donati to science, and "cut to slices" with tomographs at distance of fractions of millimeter). the reconstruction, I had to carry out it with amira visage, a software that allows to make the labeling (segmentation) of field of the various tomographic slides, and then reconstruct the surface with a superficial mesh, which can then be transformed into volumetric meche (tetramesh).
My problem is this:
I am now working with abaqus, which is able to import the stl format, and is compatible with the tetramesh created by amira. the problem is that all the files, are imported from abaqus as separate "models", so I have absolutely no idea how to bind the various models between them (e.g. contact without relative movements between bone and femur, and at first approximation, same type of contact, between soft tissues and invasive femur).
I don't know if I'm jumping a few steps... if I can make meches stl interact with volumetric meches to do the fem analysis... if I can bind all these things.. amira, that I know, cannot save in iges format, because it does not recreate the volume, but it passes from superficial meche to that volumetric.
Can anyone help me? I have some foundation of abaqus, which I used when I graduated mechanical engineering (now I am finishing biomedical engineering), but working with bio materials, it is much more complicated. .
Matteo
).then, the thesis is based on the study of the interactions between the moncone of a transfemoral amputate, and the invasiveness of the prosthesis to try to understand whether numerical modeling, can give realistic results, so that possibly work in the future on a parameterization of the shape of the invaded, based on anthropometric and biomechanical data of the tissues.
the problem is this:
1) the invasive of the prosthesis comes from a laser scan acquisition of a prototype created in reverse starting from a true prosthesis, and is saved as superficial mesh (.stl)
2) the "forms" of the hypothetical patient amputated, arrive from visible human dataset (cadaveri donati to science, and "cut to slices" with tomographs at distance of fractions of millimeter). the reconstruction, I had to carry out it with amira visage, a software that allows to make the labeling (segmentation) of field of the various tomographic slides, and then reconstruct the surface with a superficial mesh, which can then be transformed into volumetric meche (tetramesh).
My problem is this:
I am now working with abaqus, which is able to import the stl format, and is compatible with the tetramesh created by amira. the problem is that all the files, are imported from abaqus as separate "models", so I have absolutely no idea how to bind the various models between them (e.g. contact without relative movements between bone and femur, and at first approximation, same type of contact, between soft tissues and invasive femur).
I don't know if I'm jumping a few steps... if I can make meches stl interact with volumetric meches to do the fem analysis... if I can bind all these things.. amira, that I know, cannot save in iges format, because it does not recreate the volume, but it passes from superficial meche to that volumetric.
Can anyone help me? I have some foundation of abaqus, which I used when I graduated mechanical engineering (now I am finishing biomedical engineering), but working with bio materials, it is much more complicated. .
Matteo