Tensor notation to matrix notation

More Khaled Megahed's questions See All

In Abaqus python API, is these formulation give the same results?

If 'P' is the part name The first form: P.ReferencePoint(point=(0, 0, 0)) R= P.referencePoints[l] P.DatumPointByOffset(point=R, vector=(10,0,0)) P.DatumPointByOffset(point=R,...

10 November 2019 4,394 1 View

How to define a rigid link between two points in Abaqus?

I can use rigid body element or MPC constraint (type beam). What the difference between them? Is there any alternative way to define this rigid link? Thanks for reading

09 October 2019 4,992 3 View

Which is faster in writing code; using the built in trigonometric functions or using power series expansions?

Sometimes, for small angle the trigonometric, expression like sin(theta)/theta become produce ill-conditioned.

04 May 2019 5,088 2 View

What is the types of solution of a dynamic problem?

Thanks

03 April 2019 4,123 1 View

What is the Balance laws in term of 2nd Piola-Kirchhoff stress tensor?

The balance laws could be defined in term of Cauchy stress and 1st Piola-Kirchhoff stress tensor as follow https://en.wikipedia.org/wiki/Continuum_mechanics But could I define it in term of...

03 April 2019 6,295 7 View

What is the difference between variation in displacement and virtual displacement?

Also when referring to variation in the work (virtual work), we use virtual rotation not rotation variation? Thanks.

03 April 2019 5,247 11 View

How to extract the potential energy of conservative moment?

Some researchers consider rotation variables as work-conjugate with moments, others think that the displacement derivatives is, and others use semi tangential rotation as work-conjugate to...

03 April 2019 5,335 4 View

Do I need to attend a conference if my paper has been accepted for the conference?

Thanks.

03 April 2019 5,066 1 View

How to perform bifurcation analysis on structures?

I would be grateful for any references or sites. Thanks

03 April 2019 8,702 1 View

How to model anistropic damage in concrete material?

Any papers, books,codes, or sites as a start? Thank you.

02 March 2019 7,690 3 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

16 June 2021 0 0 View

fatal error

16 June 2021 0 0 View

fatal error

16 June 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

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

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10?

What's the best way to measure growth rates in House sparrow chicks from day 2 to day 10? Since, the growth curve from day 2 to 10 won't be like the "Logistic curve" it might not follow logistic...

03 March 2021 1,401 3 View