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# Finite Element modeling

Flavio Stochino's picture

A simplified model for railway catenary wire dynamics

In this paper, a simplified analytic model for the dynamic behaviour of railway catenary wire is presented. The model is discussed and validated with the help of numerical results obtained by a finite element code, for the case of a typical Italian railway installation. The simplified model is convenient from the computational point of view and is useful for sensitivity analysis. Some parametric studies have been developed by considering as free parameters the velocity and the distance of the train pantographs and looking at their effect on catenary dynamics.

Noel ODowd's picture

Fellowships (3 year) available in computational mechanics of composite materials

Expressions of interest are invited for applicants interested in applying for a 3 year post-doctoral fellowship in the area of computational mechanics of composite materials.

rajan_prithivi's picture

Local mesh refinement using Gmsh

Hello All,

I am using Gmsh for creating a finite element mesh. After I create the volume mesh, Is there a way to do a local mesh refinement around a particular point (say x,y,z) and within a sphere of given radius.

Kindly help !

 

-Prithivi

Michael A. McCarthy's picture

Marie Curie Early Stage Researcher (PhD student), Improving the crashworthiness of composite transportation structures

Applications are invited for a PhD position at the University of Limerick, Ireland, funded through the EU Marie Curie Early Stage Researcher Programme.

SALARY: €37,903 p.a. (plus family allowance of €4,589 p.a. where appropriate in accordance with Marie Skłodowska-Curie programme rules).

Topic: Development of discrete fastener-less joining technologies for impact protection devices

PhD position in multi-scale modelling of materials- Queen’s and Western University, Canada

A PhD position is available in the area of mechanics of materials. Applicants with a strong background in finite element modelling, crystal plasticity finite element, and materials characterization are recommended to apply.

How to use non-dimensional form in open source codes instead of Units

Choose a channel featured in the header of iMechanica: 

I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.

E = 5000000;                 // Young's Modulus in N/m^2 or Pa

How to use non-dimensional form in open source codes instead of Units

I am using an open source FEM platform, which requires you to convert your equation system to non-dimensional form. So, there are no units specified for the parameters in the problem. If you use compatible input units, you should expect the output in matching unit - just like one would do in a normal python or C++ code for solving physical problems. I have an elasto-plastic dynamic problem to solve, and these are the parameters for the Drucker-Prager Soil Model for soft clay.

E = 5000000;                 // Young's Modulus in N/m^2 or Pa

Cant solve "too many attempts made for this increment"-issue on some models

Choose a channel featured in the header of iMechanica: 

Hello at all,

 

I have some serious issues with some of my models in Abaqus 6.14. I need to simulate shear failure to investigate the influence of concrete strength and fracture energy on the size effect. So far, everything went good. I calculated almost 100 models without any problem with exactly the same model (only materials changed). But: For the combination of concrete strength fck=50MPa and a fracture energy of Gf=60N/m or Gf=80N/m, the calculations will stop after a short time although the .odb file shows only some minor bending cracks in the beam

Looking for a PhD position in Bio/Biomedical Engineering

Hello

I am actively looking for a PhD in Bio/Biomedical engineering. I am interested in multidisciplinary applied research, and would prefer to work in a research group of multiple expertise.

Opening for a Sr Computational Modeling Engineer at Medtronic !

This exciting position is posted today.  We are looking for someone who has strong theoretical background in material constitutive modeling and has the ability to do user material coding and simulation automation through python/R/Matlab scripting.  Experience with shape-memory alloys is desired.  Below is the link:

 https://medtronic.taleo.net/careersection/2/jobdetail.ftl?job=160000ZQ&lang=en

 

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

LS DYNA ADDING A BEAM

How do i add a reinforcement beam to a door of a car at the front using the ls dyna contact card CONSTRAINED_RIGID_BODY ?

Job position in numerical biomechanics

DECATHLON is a French company which designs and sells sports goods. With about 900 shops all around the world, DECATHLON has more than 60000 employees, all passionate about sports, and generates a 7 billion euros turnover.

 

davm5's picture

Impact Force plotting using Abaqus/Explicit

Hello Everyone

I am trying to simulate material dumping process from shovel onto mining dump truck. And for that i am using Abaqus/Explicit.  When i plot the contact force of material falling onto truck body under gravity, it gives me the maximum value of 0.12e+11, where as a simple theoretical analysis shows that the resulting impact force for 100 tons of material falling under gravity should be 9e5 N. I am not been able to understand the reason that why Abaqus /Explicit is exaggerating the impact/contact force so much. And i dont know how to correct this thing.

Simpleware case study: 3D FE Model of the Diabetic Neuropathic Foot

Diabetic foot represents a complication of diabetes that can lead to foot ulcers and other serious conditions. 3D Finite Element (FE) analysis enables dynamic characterisation of different loads within the foot.

create shell planar in 2D model ? (Abaqus 6.13)

Hi,

I have modeling a ground in abaqus and simulated earthquake. will i need allow infinite elements in the laterals model (left and right). In other examples i see in the features (module part) created  "shell planar" en the places to create the infinite element (edge, no plane)... so .. how its made ?

 

thanks. 

PD: Me english is terrible, sorry.

 

Which is the best model to capture brittle fracture and failure of ceramics at moderate velocities?

Several models have been developed over the past decades to capture the fracture and failure of ceramic materials. JH2, JHB models are widely used for simulating the behavior of armor plates upon ballistic impact. I have a doubt regarding these models. Are these models only valid when the impact velocity is in the order of 1000m/s, as under such circumstances material transitions from elastic to elastic-plastic regime defined by the HEL Pressure? But what about when the impact velocity of the ceramic is around 300-400 m/s (a fraction of ballistic impact)?

ACM2015 : International Conference on Advances in Applied and Computational Mechanics ,5-7 August 2015, Izmir/Turkey

We are proud to announce International Conference on Advances in Applied and Computational Mechanics, which is organized in the honor of  70th birthday of Prof.J.N.Reddy. This is a tribute for his many and lasting contribution to education and research in applied mechanics.

 

Conference will be held at  WYNDHAM GRAND Hotel, Inciralti Izmir/Turkey during August 5-7, 2015. 

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