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martin.levesque's picture

Post-doctoral fellowship position at Polytechnique Montréal on phase field modelling

Polytechnique Montréal is looking for a post-doctoral fellow having a very strong training in continuum mechanics/numerical methods to work on the phase field modelling of damage in materials. This one-year project will consist in deploying and applying an existing phase field code at two industrial partners: one in optics and the other in aerospace. 

Please send your CVs at my address: martin.levesque(at)polymtl.ca

Cemal Basaran's picture

Entropy Special Issue

 

Deadline for manuscript submissions: 30 November 2019

 

Special Issue "Entropy Based Fatigue, Fracture, Failure Prediction and Structural Health Monitoring"

https://www.mdpi.com/journal/entropy/special_issues/fatigue

 

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Electro-mechanical behaviour or rough surfaces

Understanding electrical contact resistance 

Electrical contact resistance at interfaces between pairs of rough surfaces is of great importance in the performance of diverse systems, particularly in miniaturised electromechanical systems containing switches.

 

In this study, the role of pressure and surface structure is explored with a view towards gaining a beter understanding of electrical contact resistance.

 

Scholarships for Postgraduate Research Students to study at Swinburne University of Technology in Australia

There are several PhD scholarships at School of Engineering, Swinburne University of Technology, Australia. The scholarship includes the annual stipend AU$27,596 for three years (with possible 6 months extension). The focus of the research will be on topology optimization of structures, materials, and metamaterials.

To be successful in this role you will need to demonstrate the following:

CMiculas's picture

How to import edited node coordinates (mesh) to Abaqus?

Choose a channel featured in the header of iMechanica: 

import modified nodes coordinates to abaqus

Antonio Papangelo's picture

Friction-induced energy losses in mechanical contacts subject to random vibrations

In this paper, we apply the previously developed Method of Memory Diagrams (MMD) to the description of an axisymmetric mechanical contact with friction subject to random vibrations. The MMD belongs to a family of semi-analytical methods of contact mechanics originating from the classical Cattaneo-Mindlin solution; it allows one to efficiently compute mechanical and energetic responses to complex excitation signals such as random or acoustic ones.

karelmatous's picture

A nonlinear data-driven reduced order model for computational homogenization with physics/pattern-guided sampling

Developing an accurate nonlinear reduced order model from simulation data has been an outstanding research topic for many years. For many physical systems, data collection is very expensive and the optimal data distribution is not known in advance. Thus, maximizing the information gain remains a grand challenge. In a recent paper, Bhattacharjee and Matous (2016) proposed a manifold-based nonlinear reduced order model for multiscale problems in mechanics of materials. Expanding this work here, we develop a novel sampling strategy based on the physics/pattern-guided data distribution.

Arash_Yavari's picture

Universal Displacements in Linear Elasticity

In nonlinear elasticity, universal deformations are the deformations that exist for arbitrary strain-energy density functions and suitable tractions at the boundaries. Here, we discuss the equivalent problem for linear elasticity. We characterize the universal displacements of  linear elasticity: those displacement fields that can be maintained by applying boundary tractions in the absence of body forces for any linear elastic solid in a given anisotropy class.

Antonio Papangelo's picture

On stickiness of multiscale randomly rough surfaces

A new stickiness criterion for solids having random fractal roughness is derived using Persson's theory with DMT-type adhesion. As expected, we find stickiness, i.e., the possibility to sustain macroscopic tensile pressures or else non-zero contact area without load, is not affected by the truncation of the PSD spectrum of roughness at short wavelengths and can persist up to roughness amplitudes orders of magnitude larger than the range of attractive forces.

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Elastic behavior in porous materials

In the work shown here:

Multiscale modeling of effective elastic properties of fluid-filled porous materials

The elastic deformation and its dependence on fluid displacement is studied at two distinct scales, to address the multi-scale nature of porous structures in nature.

 

 

 

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Electrical resistance at rough surfaces in contact

Electrical Contact Resistance of Fractal Rough Surfaces 

 

The presence of roughness at electrical contacts tends to involve contacting asperities across multiple scales. Depending on the nature of the contact between asperities on opposing surfaces, different conduction mechanisms take place. This is shown in the figure here.

Martin Kaltenbrunner's picture

Journal Club: Stretchy Electronics for Soft Robotics

In essence, we are sensor-clad soft machines capable of myriad intricate tasks. Stripped from proprioceptive feedback, we can no longer walk despite intact locomotor system. Likewise, integration of sensors, complex control loops, or machine learning is crucial in “classical” robotics. This JClub entry discusses recent efforts and challenges of merging soft electronics with robotics.

Mike Ciavarella's picture

Analytical Models for Fatigue Life Prediction of Metals in the Stress-Life Approach -- phd thesis by Pietro D’Antuono

dear collegues

  I'd be very grateful if you could have a look, if not a deep reading, at the phd thesis of my last student, playing on classical results on uniaxial fatigue, but with a view of simple, unified perspective on constant and varying amplitude fatigue.  We made large use of e-fatigue.com web site and the data in there.
 Thanks in advance for any remark.  The final thesis will be submitted in few weeks time.

noyco's picture

Drastic swelling-induced softening of polymer networks with non-covalent cross-linking bonds

Our recent work introduces a microscopically motivated model for the swelling response of polymer networks with non-covalent cross-linking bonds.

Dr. Hanaor - Department of Ceramic Materials - TU Berlin's picture

Contact stiffness of rough surfaces

Contact stiffness of multiscale surfaces by truncation analysis

 

In this concise piece of work, an effective method is shown to gain new understandings into the role of surface structure in the field of contact mechanics. In particular, normal contact stiffness is correlated to parameters of surfaces' fractal dimension and amplitude. 

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