Hello
How can i formulate a consolidated drained (CD) or consolidated undrained (CU) triaxial test (not necessary axisymetric problem) with comsol multiphysics?
I had been reading Considère's criteria for necking.
The link: http://www.steeluniversity.org/content/html/eng/1230-0120-pu.htm
describes the math and the phenomenon involved (i.e mainly necking begins when the
increase in the load bearing capacity is balanced due to reduction in cross section
area).
The final equation in the above link gived: d_sigma_t / d_epsilon_t = sigma_t.
Can we state the above equation as follows;
I have got some experimental readings of true strain vs true stress. I have fitted a straight line to the elastic part of the curve as shown in the attached figure.
As seen, the fitted straight line starts not from the origin (as the data was noisy here) but at an intermediate point (here where stress = 400 MPa)
Now, I want to draw a lien parallel to this line at an offset 0f 0.002. My question is should the offset be measured (horizontally)from the origin or (horizontally) from the point corresponding to sigma = 400 MPa?
Please help
Question on true strain - experimental reading
I have an experimental set of readings from elsewhere performed on a tension tets on steel specimen.
I have the initial area and final area (area at the point at which specimen just breaks).
I see that true strain = ln (1 + epsilon) where epsilon is engineering/nominal strain
This is through all the set of readings except the last reading.This is fine.
The last reading just befor the specimen breaks has the final area measured.
Hi all,
my question is about the history data storage in FEAP.
I am writing element subroutine (elmt01) in FEAP 8.3 for a history dependent problem (crystal plasticity).
I have written the stiffness
matrix subroutine (stiff01), but it needs the data from the previous
solution steps (previous strains, stresses, plastic strains, dislocation
densities .... nh1,nh2=30 per point).
Hi,
This is a very fundamental question
I have a mesh of 2D elements
Now, I have been given a point and know its global coordinates.
I want to find out which element in my mesh includes that point.
Is there an easier way of doing it than looping through each element in my mesh?
Please help
Hi I am currently using ANSYS 13 Workbench to do FEA on .igs files of leg bones (femur, tibia, and patella), I am new to ANSYS and I am having trouble meshing the bones. I am able to mesh the bones individually however when I import the whole leg assembly (assembled in proENGINEER) it will not mesh. Does anyone know how I can fix this?
Hi All,
I have got some xperimental data from torsion test,tension tests,compression tests on a matrerial and need to formulate a model using Johnson cook's approach (paper: "A Constitutive model and data for metals subjected to large strains, high strain rates and high temperatures"
I understand thta the main task in formulating this model is getting the constants based for Johnson Cooks model based on the experimental data.
I'm sure many experts here would have used Johnson Cooks model and got the constants using their experimental data.
IS IT POSSIBLE TO FIND A MOHR-COULOMB UMAT SUBROUTINE FOR ABAQUS?
OR ANY OTHER SUBROUTINE WRITEN IN FORTRAN?
THANK YOU
Hello there!
I am fairly new to ABAQUS but I have been trying to model several experimental set-ups on cold-formed steel beams. I intend to obtain both the elastic buckling critical modes (*buckle analysis), as well as the load parameter corresponding to failure, which i first modelled through a NLGEOM analysis (*STEP, NLGEOM, INC=xxx/*STATIC, RIKS).
