How to formulate a Structural Topology Optimization problem in MSC Nastran?

I am trying to optimize a circular casing structure for reducing the von-mises stress on it. Many examples of such problems have Minimizing compliance as the objective with mass fraction and/or...

09 October 2018 7,913 12 View

Fatal error while performing Topology Optimization in Nastran?

Following is a snippet of the error from .F06 file. *** USER INFORMATION MESSAGE 9051 (SUBDMAP FEA) STATIC SENSITIVITY ANALYSIS INITIATED. DESIGN CYCLE NUMBER= 1 *** USER INFORMATION...

09 October 2018 5,053 4 View

Simulation of an Anti-roll bar in FEM NASTRAN?

I am trying to simulate the Anti-roll bar mechanism in Nastran. I have got good results so far, meaning torque in the bar under rolling and no torque when leveled. During this the bushings of the...

11 December 2017 5,245 2 View

What is the difference between DSTRAN and DFGRD1 in Abaqus UMAT?

I want to know what exactly both these variables convey. How they differ from each other. How can I get DSTRAN from DFGRD Explanation with an example will be much useful.

04 May 2015 5,868 1 View

What is DSTRAN and STRAN variable in the Abaqus UMAT (user material) when Thermal expansion is not included in the Material definition?

03 April 2015 6,904 7 View

Is anyone familiar with rotation of STATE variables in UMAT?

The STATEV that get stored at the end of the iteration are getting carried forward. But after rotating by DROT, I printed to see the value of STATEV. They become zero after rotation. I have used...

03 April 2015 9,310 4 View

error in running a model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

error in modelling model in Abaqus

Excessive rotation of nodes in node set ErrNodeExcessRotation-Step1

17 August 2021 0 0 View

MGL tools

20 June 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

what is the simplest definition of ion exchange capacity

What this unit identifies for the ion exchange capacity ca. 0.92 meq. g-1. I am a newcomer in the membrane area. I just started. I highly appreciate your help

08 May 2021 0 0 View

i have some problem with chtMultiRegionSimpleFoam

--> FOAM FATAL ERROR: Maximum number of iterations exceeded From function Foam::scalar Foam::species::thermo::T(Foam::scalar, Foam::scalar, Foam::scalar, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar, Foam::scalar) const, Foam::scalar (Foam::species::thermo::*)(Foam::scalar) const) const [with Thermo = Foam::hConstThermo >; Type = Foam::sensibleEnthalpy; Foam::scalar = double; Foam::species::thermo = Foam::species::thermo >, Foam::sensibleEnthalpy>] in file /home/ubuntu/OpenFOAM/OpenFOAM-4.1/src/thermophysicalModels/specie/lnInclude/thermoI.H at line 66. FOAM aborting #0 Foam::error::printStack(Foam::Ostream&) at ??:? #1 Foam::error::abort() at ??:? #2 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::calculate() at ??:? #3 Foam::heRhoThermo >, Foam::sensibleEnthalpy> > > >::correct() at ??:? #4 ? at ??:? #5 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6" #6 ? at ??:?

24 March 2021 0 0 View

How to compare two groups with only two measurements?

Hiiiii everyone! I have an enquiry on statistical analysis. I was looking for many forum and it's still cannot solve my problem. I want to compare means of two groups of data but only with two...

03 March 2021 8,796 3 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence?

I am on the lookout for the Enhanced Yellow Fluorescent Protein (Aequorea victoria) DNA sequence. Does anyone know where I can find it? Thank you in advance

03 March 2021 3,568 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View