I have tried simple viscoelastic material peoperty for cartilage part but still getting same error. Job runs completely but get NaN values for stresses.
Hi,
I am running a model (to imitate indentation test) in which I have two parts 1) Deformable part (Considered to be cartilage) and a rigid body. I have given material property to cartilage part using UMAT subroutine. I am giving displacement load of -0.1 to rigid part. I can run the job...
It's a knee joint cartilage model and implemented with fibril reinforced poroviscoelastic material (UMAT). As material is very soft, I was facing convergence issues. But typically changing constraint and displacement controls (lower values than default), model do converges. Maybe not all but it...
Hi,
I am trying to converge my complex model by trying to play with controls parameters. However, it would be appreciated is someone can help me in understanding what these controls represents?
I have tried to see manual but it would be nice if someone can help me in geeting these controls and...
Hi,
I have a knee joint model which needs to be simulated with Fibril reinforced poro elastic material properties. The model run fine with stiffer material properties but when i run the model with soft material properties (resembling human cartilage tissue), I can these convergence errors. Can...
Thank you for your response. Ok so I got that the single value is from centroid but are the 8 values of max stresses from 8 nodes of same element? Also it is not good approach to get max value from single element from centriod so I want to get average of centroid values from neighbouring four...
Hei,
I have two queries. I want to get max value of maximum principal stress at each time point. I want to know that what does this mean? Are these max principal stresses in each node of element and single value is their averages at centroid?
Secondly, I want to get a max value of max...
I am getting indexes of each max value from 23 cells using [maxVal idx] = max(stress_selected_{i}); But how can I access the above and below (eg. in total 3 values above and below that max value) in matlab?
Sorry for my ignorance as I am new in python scripting but can you suggest how can I obtain coordinates of nodes with maximum values. In reference guide I have found function to get array of nodes that lie within the specified bounding box (getByBoundingBox) but I am not sure how to obtain...
Hey,
I am working on max and mean values of max principal stress and other parameters of a 3D shape in Abaqus. For taking max values, I am taking peak values (over contact area) from all nodes through each time point. But I want to take max values of parameters better option would be by taking...
Hi,
I am simulating minimum principal strain of knee models. I am getting different graphs for Confidence intervals (showing statistical difference between MRI and X-ray based models) and parametric test graphs(no significant difference). Can someone explain me how to interpret these graphs.
Thanks for your reply.
It is 3-D cylindrical model of cartilage. For boundary conditions:
Lateral expansion is allowed
Fix rotation of geometry
Free fluid flow from the tissue allowed (por=0 on outer most surfaces).
5% Compression of tissue’s thickness
I have attached...
I have to analyze the stress relaxation response (reaction force as a function of time) of a poroelastic,isotropic material (cartilage) that is compressed to 5% of its thickness in unconfined compression. Young modulus is 0.5 Mpa, poisson's ratio as 0.15 and permeability as 1e-8. Nlgeom is off...
Hi,
I need to determine whether it's left knee's or right knee's lateral view and Anterior Posterior view in MRI DICOM data? I have used 3d-Slicer to get DICOM info but is there any way I can determine information about specific views in MRI DICOM?
I have to measure maximum anterior-posterior length of bones (condyles) in X-ray images of knee. I am using ImageJ (Fiji) software for that. However, one problem is that I have to incorporate the phantom of 30mm in the readings as well. How I can do scaling for that in ImageJ?
Thanks for your reply..I have worked with CT-Scans in MIMICS/3-D Slicer but I am unsure that segmentation from x-rays is possible in them?Do I need any software which can buid statistical shape models from x-rays?
Thank you for your reply...Can't we build 3-D models from x-rays (even bi-planar) in MIMICS? In case of single planar x-ray can we use statistical shape models?
https://mede-innovation.ac.uk/news-article/partner-news-combine-3d-models-x-ray-images-latest-release-mimics/
Need recommendations for constructing 3-D joint models of knee from Planar X-rays..what softwares are best for detailed modelling of knee joints (including ligaments, tendons, cartilage and meniscus) from planar x-rays??? Don't want to use image segmentation methods in MATLAB..not perfect in...
