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Mode Superposition Method

Submitted by SivaSrinivasKolukula on
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Computational Mechanics Forum
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We know that in Dynamic Analysis , to solve the equations of the form:



[M]{D2 X} +[C]{D1X}+[K]{X} = {R} ---------------- EQ.1



Where [M], [C],[K] are square matrices of mass, damping and stiffness matrices respectively.



D is derivative wrt time, {X}, {R} are the column matrices of displacement, external load respectevily.



We
use either direct step by step integration method or mode superposition
method. Both of them have advantages one over the other. Say, I am

Effects of mismatch strain and substrate surface corrugation on morphology of supported monolayer graphene

Submitted by Rui Huang on
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R. Huang Group Research
graphene
instability
van der Waals interaction

In a previous work, substrate-modulated morphology of graphene was analyzed using a numerical Monte Carlo method. Here we present an analytical approach that explicitly relates the van der Waals interaction energy to the surface corrugation and the interfacial properties. Moreover, the effect of mismatch strain is considered, which predicts a strain-induced instability under a compressive strain and reduced corrugation under a tensile strain.

ABAQUS

Submitted by anjudeepak on
research

Hi.

 I was trying to reproduce the work of Zhuang,Ellis and Yu to get a feel about ABAQUS before starting my actual work...i have already went through the geotech examples given in ABAQUS examples manual.

But i am not able to understand the analysis steps performed in this paper.

Could anyone please help me...

-anju 

 

Fracture mechanics

Submitted by manooir on
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Lower limit in LEFM

Hi,

In have modelled a beam with a hole using LEFM and FEM, assuming a crack length, I was able to indicate the failure load of the beam with a hole. Now, I would like to find a diameter of the hole which I can claim that in this diameter, there is no effect of the hole on the total strength of the beam. Would you please give me an idea of what to do? Is there any thing that I can do withmy model to find out about this? Is there a lower band in LEFM to limit its using?

Thank you,

 

question about Gurson model

Submitted by Reza_Rastgar on
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Gurson
void volume fraction
hydrostatic compression

I have a question regarding Gurson model. If we have a cube with initial length of unit and initial porosity of 20 percent and compress it hydrostatically in order to have a huge volume change of cube, the void growth equation in Gurson model takes a negative rate and reduces the void volume fraction to zero first and further compressing leads to no further void volume fraction change (remains zero) and no more plastic straining. Now let's load the model in tensile hydrostatic state up to a stress free configuration; the void volume fraction of the model remains zero.

Thermal stresses from pre-defined temperature data (thermography image)

Submitted by Aitor Garcia on
research
Thermal stresses from pre-defined temperature data (thermography image)

I´m facing a problem in which a I´d like to assess stresses due to thermal gradients. I have an IR thermography image (recorded as a matrix) and I like to introduce those temperatures to Abaqus via Matlab.

Is that possible? Or should I use FORTRAN with the UTEMP subroutine?

Thanks in advance,

 

Aitor  

Soil Modeling

Submitted by shivananjegowda137 on
research
SOIL modeling

Hi

Please help in modeling the soil.

I  modelled soil as non linear springs in Abaqus?Standarads and analysed the pipe behavior for hydrodynamic loading.

I am currently planned to model the pipe-soil interaction with soil as an 2D or 3D element along with contact properties. Give me suggestion or methods how can i model soil.Suggested reading materials.I have gone through the abaqus documentation.It tell that soil can be modeled as 2D or 3D.I am really confused which one to use. 

Please give me some steps in creating soil and pipe model .

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