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Underwater Soil Mechanics Problem

I am an undergraduate student conducting a research project involving the design of a tool to aid astronauts to perform experiments on lunar surfaces and would like to request some direction about which analytical tools would be best suited for this application (i.e. FEA or DEM software/techniques). The specific scenario of interest is to design a tool that can act as an anchor in a sand-like medium (regolith) on the surface of the moon.

defining a time dependent elastic modulus

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I'm working on a model with Abaqus and I face a problem. One of my materials has an elastic modulus which isn't constant according to time. As I search I found out that this should be done by USDFLD subroutine. I'm not familiar with subroutins and how to write them and all the resourses that I've found just confused me more. I would be grateful if someone helps me.....

Invitation to Hybrid Films to Human Skin: The Relationship between Structure, Processing and Function


Dear All,


I would like to invite fellow bloggers in Singapore to a Singapore University of Technology and Design (SUTD) Engineering Product Development (EPD) Lecture Series talk titled: 

Hybrid Films to Human Skin: The Relationship between Structure, Processing and Function

presented by Professor Reinhold H. Dauskardt (Stanford University), on Tue, 12 July 2016, 3:00pm – 4:00pm Singapore Time, SUTD Lecture Theatre 1 (1.102).

Newton Raphson for FEM

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I am currently working on a FEM  2d plane strain elastic model in matlab. The next step would be to use a non linear constiutive law (Mohr-Coulomb). As far as I have been reading non linearities, are solved with iteration schemes. My question is how to compute the tangent matrix with the N.Raphson method? I have seen only case for polynomials, but not for matrices.



bangjianli's picture

Looking for further learning opportunities

I am a PhD candidate at Shanghai Jiao Tong University, China.

My research intrest is Digital Image Correlation (DIC).

I am looking for the opportunities for further study.

My email:

Thank you for considering my request.

All the best to you.

Discrete Element Modelling (DEM)

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Can I use DEM using Abaqus 6.14?? If yes how?? 

Thank you

rajan_prithivi's picture

Large Deformation - Definition of total work energy density

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Like we have the elastic strain energy density for small deformations  defined as 0.5* σ :e  .

Is the equation PK2:E valid for the total work energy density for elastoplastic regimes ? If not, what would be a valid equation for total energy density ?

How can we decompose total work density into elastic work and plastic work densities for a large deformation case.


PK2 is the second piola kirchoff stress tensor

E is the Green-Lagrange strain tensor






shreeram111's picture

Plane_Stress, Plane_Strain and 3D - Simple doubt..

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Hello everybody,

 UPDATE :   Question can be deemed as closed.. :)

                       I have a very simple doubt in 3D model simplification. I believe plane stress and plane strain conditions are the two extreme states to simplify a 3D model to 2D case.

Transfroming applied tractions into statically equivalent nodal force BC

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I am trying to produce results for problems with knwon analytical solution to validate my FE code. One of the problmes is the classical plate with a hole configuration with tractions applied at boundaries. However, presently, I can only impose BC in terms of nodal forces and displacements. Therefore I must transform the applied stress in statically equivalent nodal forces.

jenda_z's picture

Modeling of Localized Inelastic Deformation 2016 (LID 2016)

Dear colleagues,

on behalf of the course organizer, I would like to bring to your attention to the advanced course on Modeling of localized inelastic deformation that will be taught by Milan Jirásek in Prague, Czech Republic on 19-23 September 2016.

Simpleware at Hartree Summer Schools 2016: Week 2 - Engineering Simulation

Dates: June 27 - July 1, 2016

Venue: The Hartree Centre, STFC Daresbury Laboratory, Warrington, WA4 4AD, UK    [Directions]

School Leaders: Lee Margetts (University of Manchester), Anton Shterenlikht (University of Bristol), and Llion Evans (Culham Centre for Fusion Energy)

Registration Fee: £150

Simpleware are contributing to this event.

PhD and Master’s Positions in Civil and Materials Engineering at Howard University, Washington, DC

The Sustainable Infrastructure, Geotechnics, and Materials (SIGMa) Lab at Howard University, Washington, DC invites applicants for two PhD and one Master’s positions in geotechnical and materials engineering for Fall 2016 and Spring 2017. Highly-motivated, industrious individuals with strong computational and/or experimental skills, journal/conference publications, excellent English proficiency, and the ability to work both independently and as part of a collaborative team are strongly encouraged to apply.

IIMEC 2016 summer school on "Advanced Material Systems: Experimentation and Modeling"

On behalf of the International Institute for Multifunctional Materials for Energy Conversion (IIMEC) and the Department of Mechanical Engineering at Aristotle University of Thessaloniki, we would like to announce a summer school on Advanced Material Systems: Experimentation and Modeling. The summer school will be held from July 3–9, 2016 on the Aristotle University campus in Thessaloniki, Greece. 

Pressure Difference Calculation in ABAQUS

Hi everyone, 

I am working on ABAQUS to simulate Pipeline Inspection Gauge (PIG) movement in a pipeline via CEL technique. I am unable to find how to calculate Pressure Difference in the pipeline using Abaqus.

If anyone of you can guide me through it.


MD Aftab

Simplified slip-bearing action by using stop ellement in Abaqus

can anyone please advise me to define connector ellements with following details:
Using rigid plastic CARTESIAN element and a STOP element in parallel and The connector behaviour must be:
1- rigid up to the slip force limit Rn
2- slip at the bolts up to ±1 mm at constant force Rn
3- rigid bearing hardening


Summer School - HPC for Engineering Simulation

The STFC Hartree Centre (in Warrington, UK - located between Manchester & Liverpool) is running 4 high performance computing summer schools from June to July 2016. They are primarily aimed at PhD students and postdoctoral researchers, but are also open to academics and industry at no extra cost. The tuition fees are subsidised by STFC and each week only costs £150. There is a 1 week school on each of the following topics:

Dargazany's picture

PhD position in Mechanics of High Performance (bio)Materials

Our Group of High Performance Materials in Enviormental & Civil Engineering Department at Michigan State University has an openings for PhD positions to work on Multiscale Modeling of Soft Materials starting Fall 2016.


Simple Physics concepts


    I have a small doubt. It may feel silly, but please reply.. 

   Suppose I have a pendulum and it is impacting onto a structure. The mass of pendulum is 'm' and the intiial velocity is 'v'. The condition is that the KE at the time of impact should be 'E'. E= 0.5*m*v2 . 

  Now i change the mass of the pendulum to m1 correspondingly velocity should be changed to v1 so that E1=E.

 Now i need to compare the force transmitted to the structure. F = ma. 

Welding analysis with Abaqus

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Hello everyone,

7th Summer School on Biomechanics of Soft Tissues: Multiscale Modeling, Simulation and Applications

7th Summer School on Biomechanics of Soft Tissues: Multiscale Modeling, Simulation and Applications
Graz University of Technology, Austria
July 4 - 8, 2016

coordinated by:
Gerhard A. Holzapfel, Graz University of Technology, Austria
Ray W. Ogden, University of Glasgow, UK

kourousis's picture

PhD position in Additively Manufactured Metals Plasticity (Extended Deadline: 17 June 2016)

PhD Studentship (4 years) @University of Limerick

Cyclic Plasticity of Additively Manufactured (AM) Metals: Experimental Investigation & Constitutive Modelling

Background & Research Objectives


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