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Time Integration Schemes for 2D Dynamic Crack Propagation

1. Is there anyone familiar/working with the time integration schemes for 2D dynamic crack propagation in XFEM? I would like to discuss some of the issues I am facing. I will really appreciate any kind of help/suggestions! 

2. I tried to implement the time integration scheme proposed by Combescure et. al (An energy-conserving scheme for dynamic crack growth using the extended finite element method). But I am not sure about some of the strategies they are following in that paper. Anyone can clarify some of the questions I have?


linst06's picture

Fringe Instability in Constrained Soft Elastic Layers

Soft elastic layers with top and bottom surfaces adhered to rigid bodies are abundant in biological organisms and engineering applications. As the rigid bodies are pulled apart, the stressed layer can exhibit various modes of mechanical instabilities. In cases where the layer’s thickness is much smaller than its length and width, the dominant modes that have been studied are the cavitation, interfacial and fingering instabilities.

Arash_Yavari's picture

Small-on-Large Geometric Anelasticity

In this paper we are concerned with finding exact solutions for the stress fields of nonlinear solids with non-symmetric distributions of defects (or more generally finite eigenstrains) that are small perturbations of symmetric distributions of defects with known exact solutions. In the language of geometric mechanics this corresponds to finding a deformation that is a result of a perturbation of the metric of the Riemannian material manifold. We present a general framework that can be used for a systematic analysis of this class of anelasticity problems.

Effects of surface tension and electrochemical reactions in Li-ion battery electrode nanoparticles

The size- and shape-dependency of the chemo-mechanical behavior of spherical and ellipsoidal nanoparticles in Li-ion battery electrodes are investigated by a stress-assisted diffusion model and 3D finite element simulations. The model features surface tension, a direct coupling between diffusion and elasticity, concentration-dependent diffusivity, and a Butler-Volmer relation for the description of electrochemical reactions that is modified to account for mechanical effects.

okeles's picture

San Jose State University Materials Engineering Faculty Position

We are intersted in candidates with expertise in mechanics of materials and additive manufacturing. 

There are also two more positions in Biomedical and Chemical engineering, below are the details.

Salary Range: Commensurate with qualifications and experience.

Starting Date: August 21, 2017

Eligibility: Employment is contingent upon proof of eligibility to work in the United States.

Jie. Yin's picture

Temple University Mechanical Engineering Department Chair Opening Position

The College of Engineering at Temple University invites applications for the position of Chair of the Mechanical Engineering Department. The Mechanical Engineering Department serves more than 550 undergraduate majors and 50 graduate students, and includes 21 full-time faculty and three full-time support staff.

Dibakar Datta's picture

Employment Opportunity :: Computational Modeling of Energy Materials

Dear All,

Prof. Nikhil Koratker , Editor of CARBON, is a world-renowned researcher in the field of energy research. Please visit his homepage for detail. 

UC Santa Barbara Mechanical Engineering Faculty Positions

The Department of Mechanical Engineering at the University of California, Santa Barbara invites applications for two full-time faculty positions with an anticipated start date of July 1, 2017, or later. The Department is looking for exceptional individuals in all core areas of Mechanical Engineering with particular emphasis in fluid mechanics (tenure-track Assistant Professor), and micro and nanoscale thermal sciences and their application to energy systems (tenure-track Assistant Professor or tenured Associate Professor).

TURBOdesign1 allows Honeywell to Design High Performance Turbocharger Compressors

Honeywell Turbo Technologies to present the power of TURBOdesign Suite with the success of turbocharger compressors at this year’s VINAS conference 2016 in Tokyo

Honeywell is a global fortune 100 company that invents and manufactures technologies to address tough challenges linked to global macrotrends such as safety, security, and energy. They will take the stage and present at this year’s VINAS conference on 13th and 14th October 2016 in Tokyo Conference Center Shinagawa.

Lifeng Wang's picture

PhD Positions Available in Solid Mechanics and Advanced Materials

Two PhD positions are available immediately in the Department of Mechanical Engineering at State University of New York (SUNY) Stony Brook University, New York, US.

Arash_Yavari's picture

Hilbert Complexes of Nonlinear Elasticity

We introduce some Hilbert complexes involving second-order tensors on flat compact manifolds with boundary that describe the kinematics and the kinetics of motion in nonlinear elasticity. We then use the general framework of Hilbert complexes to write Hodge-type and Helmholtz-type orthogonal decompositions for second-order tensors.

Faculty Position in the Department of Civil and Environmental Engineering at the UNIVERSITY OF PITTSBURGH

The Department of Civil and Environmental Engineering at the University of Pittsburgh invites applications for a tenure-track faculty position at the Assistant Professor level effective September 1, 2017.  This position is part of the strategic expansion intended to support research and teaching activities in the areas of sustainable water and environmental engineering. 

behrad_koohbor's picture

Call for Abstracts SEM 2017: Shock and Blast

Dear Colleagues,

We would like to invite you to submit an abstract for the Shock & Blast session under track 1'Dynamic Behavior of Materials'. This symposium is part of the 2017 SEM Annual Conference & Exposition on Experimental and applied Mechanics to be held at Hyatt Regency Indianapolis, Indianapolis, IN, USA, June 12-15, 2017.

Shuman_Xia's picture

Call for Abstracts: Symposium on “Mechanics of Energy and Energetic Materials” at SEM 2017 (Indianapolis, IN, June 12-15, 2017)

Dear Colleagues,

We would like to cordially invite you to submit an abstract to the 2017 Society for Experimental Mechanics (SEM) International Congress session on “Mechanics of Energy and Energetic Materials”. The conference will be held in Indianapolis, IN from June 12–15, 2017. Abstracts are due October 17, 2016 via the website.

Mechanics of Energy and Energetic Materials

Arash_Yavari's picture

Gérard Maugin (December 2, 1944 - September 22, 2016)

Dear Friends:

As was also mentioned by another colleague (, Prof. Gérard Maugin passed away on September 22, 2016.

The following is a message that my good friend Prof. Marcelo Epstein sent me and a few other colleagues. He has kindly given me permission to share it with you.

mohamedlamine's picture

Failure Envelope

A finite element software computes the stresses and/or strains sets values at each dynamic iteration step. These values can be plotted on a stress-space giving several failure envelopes. For an isotropic or an homogeneous mixture the Von Mises criterion represents an ideal envelope which may not coincide with the available envelopes but the stresses values can be checked with the material strength.

How to use rule-of-mixtures in order to obtain mechanical properties of bidirectional composites?

Choose a channel featured in the header of iMechanica: 

Dear all,
We are easily able to obtain mechanical properties (such as elastic modulus, Poisson's ratio and ...) of a unidirectional lamina composite by means of rule-of-mixture. 
For instance, in case of "longitudinal loading", strength of the fiber-reinforced composite for long continuous fibers will be like:

I have two main questions: 
First, are these relations (longitudinal and transverse loading) hold for bidirectional composite? if not, how can we obtain relative elastic modulus? 

The Mechanical Laboratory of Sousse Scientific Workshop

The Mechanical Laboratory of Sousse (LMS) of the National School of Engineers of Sousse intends to organize annual scientific workshop on one of the four research themes identified by the laboratory teams. This first Workshop is proposed by the LMS team: “Fatigue of Materials and Structures”. The proposed theme is ” Mechanical performance of materials: From experiments to predictive approaches”.

The Mechanical Laboratory of Sousse Scientific Workshop

The Mechanical Laboratory of Sousse (LMS) of the National School of Engineers of Sousse intends to organize annual scientific workshop on one of the four research themes identified by the laboratory teams. This first Workshop is proposed by the LMS team: “Fatigue of Materials and Structures”. The proposed theme is ” Mechanical performance of materials: From experiments to predictive approaches”.

Yonggang Huang's picture

A perspective paper on material failure theory and applications

The Perspective papers published in Journal of Applied Mechanics have attracted a lot of readers, such as the first perspective paper by Huajian Gao (Brown University) which has been downloaded for >8,000 times.  A perspective paper, as invited by the editor of JAM, is very short (2~3 pages) and easy to read (like Readers' Digest) to reveal some emerging directions, or some important discoveries in clasical directions, in mechanics.

How to develop a new constitutive model from scratch?

Dear all  iMechanica, I wonder if there is any good  material on constitutive modeling that explains how to develop a new constitutive model from scratch, e.g. from the experimental data say uniaxial tension and compression. Where should one start to develop a new constitutive model? What laws should the model obey?  These questions perhaps are addressed in many continuum mechanics text books. but I am looking for materials that explain in a concise (short) and easy to understand way.

Wenbin Yu's picture

2016 cdmHUB Annual Workshop at Purdue

Join us for the 2016 Composites Simulation Workshop at Purdue University. Learn about and engage with world-class researchers and industry experts in multi-scale composites modeling. Interact with state-of-the-art composites simulation software; hear expert, cutting-edge advances in strength and lifecycle prediction modeling. Experience composites 3D printing and advances in composites manufacturing modeling for high-rate automotive applications.


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