research
Heating patterns in English homes: national survey vs common model assumptions
Hightlights of this open access article published in Building and Environment:
• Building stock models need to revise some of their assumptions on space heating.
• Weekends and weekdays are similar in their heating pattern and duration.
• Estimated heating demand temperature is slightly lower than the assumed 21 °C.
• Homes differ widely in their hours of heating and their demand temperature.
Crack length measurement
I am trying to measure J - integral from experiment. " Let my initial fatigue crack length is 6mm, then i did single specimen unloading compliance test on it. The crack legth increased to 8mm" If i want to model the same geometry in FEA. Now my doubt is that "what carck length should i take 1) Initial fatigue crack = 6mm 2) final crack length = 8 mm.................... Note: I need to model my CT specimen in FEA to correct my experiments :-)
Parallel Multiscale modeling in ABAQUS using UMAT
Hello everyone,
I am currently in the process of implementing a multiscale modeling approach in ABAQUS/Standard.
Here is what I am doing.
Macroscale ABAQUS model <--> UMAT <--> Python script <--> Microscale ABAQUS model
So basically the microscale model is being called at every macroscale integration point. The UMAT passes the required data to python as command line arguments and the python script returns the stress and tangent modulus in a text file.
Scaling theory of continuum dislocation dynamics in three dimensions: Self-organized fractal pattern formation
Y. S. Chen, W. Choi, S. Papanikolaou, M. Bierbaum, J. P. Sethna
instability induced by incoherent twin boundary in nanotwinned copper
1. Strain hardening and softening in nanotwinned Cu:
Nanotwinned Cu foils with about 99% coherent twin boundaries (TBs) among all the boundaries were made. These coherent
TBs, with an average spacing of 25 nm, were engineered approximately parallel to foil surfaces. Low plane-strain deformation
enhances the hardness by refining microstructure and introducing dislocations. High plane-strain deformation results in crystallographic
lattice rotation and reaction between dislocations and coherent TBs, and induces incoherent TBs, thus twin coarsening and
buckling
dear all : Ihave problem in dynamic buckling analysis in abaqus ,I simulated a shell part and put it between two rigid plates and next i put velocity on the one of the rigid plate for buckling-my value of velocity is 8.33e-5 and its very small value .now after the analysis the shell body was not crushed when i increase the value of velocity the crush will occur but i want crush will occur with this velocity and i dont know what do i.please help me.
Riks analysis using ABAQUS
I was doing an analysis using ABAQUS for snap buckling of conical shell using Static Riks option. But finding difficulty from switching over from static general step to static Riks. Program is aborting telling that constraints are rigid.
If anyone can help please respond
Using Substructure for contact modelling in Abaqus
I have a
problem to use substructure for contact anaylsis of two gears. I have
already read the example in abaqus Example problem manual for help.
Well, to explain my problem in detail, I have two nastron files of two
gears and later using FORTRAN I am able to write the programm to
generate the *.inp files. What I tried to do is
1. Substrcture generation of two gears in seperate files. Now I have two
sets of substructures available for individual gears. While generating
the substruture, I have retained the DOF for the nodes which are on the