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New book: Mechanics of Soft Materials

Submitted by Konstantin Volokh on

This book is an outgrowth of lecture notes of a graduate course on mechanics of soft materials that I teach since 2009. The interest in mechanics of soft materials is triggered by the development of new engineering and biomedical technologies. Mechanical behavior of soft materials is strongly nonlinear from both physical (constitutive equations) and geometrical (large deformations) standpoints and the standard texts on mechanics of materials are not enough in this case. The nonlinearities make the subject challenging yet rich and exciting. 

Discussion of fracture paper #14 - How to understand the J-integral when multiple cracks are growing at different rates

Submitted by ESIS on

A nice demonstration of toughening by introducing multiple secondary cracking of planes parallel with the primary crack is found in the paper:

”Fracture resistance enhancement of layered structures by multiple cracks”  by Stergios Goutianos and Bent F. Sørensen in Engineering Fracture Mechanics, 151 (2016) 92-108.

RVE size determination

Submitted by Mirkhalaf on
research
multiscale modelling

The definition of the size of the Representative Volume Element (RVE) is extremely important for the mechanics and physics of heterogeneous materials since it should statistically represent the micro-structure of the material. In the present contribution, a methodology based on statistical analysis and numerical experiments is proposed to determine the size of the RVE for heterogeneous amorphous polymers subjected to finite deformations.

Call for Papers: Experimental Mechanics Special Issue on “Mechanics of Energy Materials”

Submitted by Shuman_Xia on
research
Special issue
experimental mechanics
energy materials

Advanced energy materials hold one of the keys to fundamental advances in the conversion, storage, and harvesting of energy for a broad range of consumer electronics, automotive, aerospace, and defense applications. The successful development and deployment of these materials relies critically on a fundamental understanding of strongly coupled multiphysics phenomena. Mechanics of energy materials has emerged as a rapidly growing area of research that has significant technological implications in improving the efficiency, reliability, and sustainability of energy infrastructure.

Call for Papers: 16th annual IEEE International Conference on Bioinformatics and Bioengineering (October 31 - November 2, 2016), Taichung, Taiwan

Submitted by Adesola S. Ademiloye on
conference
Biomaterials; Biomechanics; Tissue and Cell Engineering; mechanical behavior; Nano-Medicine


XFEM ERROR IN ABAQUS

Submitted by juapagma on

Hello,

I am trying to evaluate the behaviour of a 2D plain strain "cut and cover" tunnel section when I apply static loads (by the moment)

I am using XFEM method in order to evaluate the cracks through the reinforced concrete material. The model has been meshed by CPE4R elements (Quad)

I have modelled 2 types of steps: Geostatic in order to apply the initial stress state and Static, general for the rest of steps.

I am trying to solve the error below:

A xfem analysis with pore pressure degrees of freedom is not supported.

Is it possible to solve buckling in Abaqus with only residual stress defined as predefined load?

Submitted by frobles on
software
ABAQUS
buckling
residual stress

Hi Sirs,

As title, I wondering if the problem can be solved with only material residual stress but no other external load applied?

After several trials, Abaqus returns message
"MASS OR DIFFERENTIAL STIFFNESS MATRIX IS COMPLETELY NULL. THE EIGENPROBLEM CANNOT BE SOLVED. IN A *BUCKLE ANALYSIS THE MOST LIKELY CAUSE IS THAT A NONZERO LOADING PATTERN WAS NOT SPECIFIED VIA *BOUNDARY, *CLOAD, *DLOAD, ETC,. SEE Eigenvalue Buckling Prediction IN THE ABAQUS/STANDARD USERS MANUAL"

PhD Positions in Computational Solid/Fracture Mechanics at Utah State University (USU)

Submitted by Ling Liu on
job

We have 1-2 PhD positions for modeling the fracture and failure in nuclear materials. The funding comes from a collaborative project involving five universities and one national lab.

The students will have opportunities to work with experimentalists and other computational experts at USU and from the national lab.

Requirements:

1. For applicants with no degree from a English-Speaking country: 

TOEFL >= 79 or IELTS >= 6 (and a minimum score of 5 on each subscale)

2. GRE verbal and quantitative scores (no minimum requirement)

Thermal wave propagation in finite velocity

Submitted by Weijie Liu on

Hello All,

For the Cattaneo's hyperbolic heat equation with relaxation time,

usually a simple plane thermal wave Τ=T0 * exp[ ¡ (kx - ωt) ], with definition k is the (complex) wave number and ω is the the (real) frequency, is adopted to obtain the dispersion relations of the heat equation.

And consequently, the velocity is defined as: [ω / Re(k)].

 

My confusion is that is it necessary or obligatory to let k be complex and w be real?

If the answer is yes, then why?

If no, then it's possible to let both k and w are real?

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