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Flavio Stochino's picture

Eigenerosion for static and dynamic brittle fracture

In contrast to many numerical methods, the eigenerosion approach yields a convenient description of fracture handled in the postprocessing part of a Finite Element Analysis (FEA). Its fully energetic formulation avoids the introduction of extra degrees of freedom to model fracture propagation. Following previous works on eigenerosion, in this publication, a modified formulation of eigenfracture it is introduced, where it is distinguished between compression and tension loaded state.

Newton optimization algorithm made 10x faster. From necessity to reality.

A new optimization concept is introduced which involves the gradient-based optimization of any nonlinear structure by using gradients calculated from a linear equivalent, leading thus to significant computational savings compared to the classical Newton-type optimization algorithms which require gradient information from the nonlinear structure itself.

Lihua Jin's picture

Call for abstract for SPIE 2018 Behavior and Mechanics of Multifunctional Materials and Composites XII conference

SPIE 2018 Behavior and Mechanics of Multifunctional Materials and Composites XII (SSN04) conference will be held in Denver, Colorado, United States on March 4 to 8 2018, as a part of SPIE Smart Structures + Nondestructive Evaluation. 

Topics of interest are broadly grouped into the following categories:

• functional soft materials and structures

• mechanics of smart and multifunctional materials

• modeling and simulation of smart and multifunctional materials

Two PhD positions for Computational Materials and/or Computational Mechanics

Mississippi State University, Mechanical Engineering department is seeking outstanding candidates for the project “Theoretical Understanding of Porosity-Induced Mechanisms during Solidification of Cast Alloys and their Influence on Process-Structure-Property Correlations”, which is funded by a NSF grant.

Abstract submission open for mini-symposium "Micromechanics-based Nonlocal Continuum Models" at ESMC 2018, Bologna, Italy

Micromechanics-based Nonlocal Continuum Models organised by Lorenzo Bardella (University of Brescia) and Samuel Forest (Mines ParisTech CNRS) http://www.esmc2018.org/drupal8/node/96  Submission deadline: November 15th, 2017  Nowadays, problems involving more physics and more length and time scales have become very relevant in engineering applications. Theoretical frameworks limited to conventional continua are often inadequate to model such problems.

Alejandro Ortiz-Bernardin's picture

Veamy: an extensible object-oriented C++ library for the virtual element method

This paper summarizes the development of an object-oriented C++ library for the virtual element method (VEM) named Veamy, whose modular design is focused on its extensibility. The two-dimensional linear elastostatic problem has been chosen as the starting stage for the development of this library. In contrast to the standard finite element method, the VEM in two dimensions uses polygonal finite element meshes.

Multi-scale finite element modeling of magnesium medical devices

<p>Applications are invited from suitably qualified candidates for two full-time Postdoctoral Researcher positions on the finite element simulation of magnesium orthopaedic implants. These three year fixed term positions are funded through a US-Ireland R&amp;D Partnership Programme involving collaboration between the SFI Centre for Research in Medical Devices (Cúram), the NSF Engineering Research Centre Revolutionizing Metallic Biomaterials (RMB, USA), and the Nanotechnology and Integrated Bioengineering Centre (NIBEC, Northern Ireland).

Unit testing MPI applications

New article: Unit testing and continuous integration of MPI applications with googletest and cmake. http://www.parresianz.com/mpi/c++/mpi-unit-testing-googletests-cmake/

msaeidi's picture

High thermal conductivity through simultaneously aligned polyethylene lamellae and graphene nanoplatelets

The effect of simultaneous alignment of polyethylene (PE) lamellae and graphene nanoplatelets (GnP) on thermal conductivity (k) of PE-GnP composites is investigated. Measurements reveal a large increase of 1100% in k of the aligned PE-GnP composite using 10 weight% GnPs relative to unoriented pure PE. Rate of increase of k with applied strain for the pure PE-GnP composite with 10 wt% GnP is found to be almost a factor of two higher than the pure PE sample, pointing to the beneficial effect of GnP alignment on k enhancement.

malfano's picture

Multiple post-doc positions at COHMAS-KAUST

 The Division of Physical Sciences and Engineering at King Abdullah University of Science and Technology (KAUST), Saudi Arabia, invites applications for Postdoctoral fellow in Mechanical Engineering at the Composite and Heterogeneous Material Analysis and Simulation Laboratory (COHMAS, http://cohmas.kaust.edu.sa). 

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JRF position at Indian Institute of Technology Roorkee

Applications are invited from Indian nationals for the post of Junior Research Fellow in a sponsored research project Nonlinear Interaction of Guided Waves with Delamination Defects in Composite Waveguides.  Expected research activities involved in the project are 

How to simplify the circular section to the 2-D plane strain problem

Hi friends, 

   I am calculating the bearing capacity of a circular footing on soil using the 3-Dimensional FE model. Meanwhile, I have seen some literature, in which they simplfied the 3-D model to 2-D plane strain model.  In their plane strain models, the footing has the same diameter with 3-D model.

2 Post-Doc Positions in Computational Materials Science

Within the framework of the Cluster of Excellence Engineering of Advanced Materials at the Friedrich-Alexander-Universität Erlangen-Nürnberg the materials modeling group of the Institute for General Material Properties is inviting applications for postdocs in the field of atomistic simulations of mechanical properties.  The research projects will focus on the role of interfaces on the plastic deformation and fracture of nanostructured materials.

PhD Position in Computational Materials Science / Glass Physics

The Atomistic Materials Modeling group of Prof. Erik Bitzek is inviting applications for a fully funded PhD position at the Institute for General Materials Properties within the Department of Materials Science of the Friedrich-Alexander-Universität Erlangen-Nürnberg in Erlangen, Germany. The objective of the PhD project is to use atomistic simulation methods to study the influence of topological anisotropy on the mechanical properties of inorganic glasses.

 

Simulate adhesion between two colliding parts in Abaqus

Dear all,

 I have two parts in my model, one part impacts on an another fixed part. I was wondering if is it possible to specify a criterion during this collision simulation that would enable adhesion between those parts when the stress or strain in either of the parts reaches a critical value? If so, can anyone suggest some suitable reference or a methodology to achieve this? I know, I can use cohesive surfaces to simulate bonding. But, I want to use a criterion pertaining to entire parts and not just surfaces. Any suggestions or help would be most welcomed.

PhD Position in Atomistic Simulations / Computational Fracture Mechanics

The Institute for General Materials Properties of the Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) is seeking outstanding candidates for the project “microKIc – Microscopic Origins of Fracture Toughness”, which is funded by an ERC Consolidator Grant.

Leon Mishnaevsky's picture

Abaqus/Python - commands to find nearest node to a given point

Hi,
I need to write a python comman code to find a node (in a given set), nearest to a given point.
The code now looks as follows:
import sys
sys.path.insert(10, 
r'c:/SIMULIA/Abaqus/6.13-3/code/python/lib/abaqus_plugins/findNearestNode')
import nearestNodeModule
nearestNodeModule.hideTextAndArrow()
a = mdb.models['FibreModel'].rootAssembly
n1 = a.instances['Fibre0-1'].nodes

kamal paknejad's picture

help to wright umat for multi yield surfaces j2 plasticity model

Hi every one. Im working on multi yield surfaces j2 plasitisity and if its possible i want add cappability to predict time dependant hehaivior of geomaterials. to start i must wright an umat code for multi yield surfaces j2 model. please help me how can i find it or give me any information about it. thanks for every one.

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