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GTN model

I have 2 questions regarding GTN model.

1) What does q1, q2, q3 signify in GTN damage model? What are their physical meanings. I know only their numerical values.
2) How to deal with the problem of GTN in Compression? It is working fine with tension but while in compression it is unable to converge.

Qunyang Li's picture

Journal club for April 2018: Friction of atomically-thin sheets

Friction of atomically-thin sheets

Qunyang Li

Department of Engineering Mechanics, Tsinghua University



Alejandro Ortiz-Bernardin's picture

A volume-averaged nodal projection method for the Reissner-Mindlin plate model

We introduce a novel meshfree Galerkin method for the solution of Reissner-Mindlin plate problems that is written in terms of the primitive variables only (i.e., rotations and transverse displacement) and is devoid of shear-locking.

Refat_Islam's picture

Mechanics of Mushroom as a material

We recently characterized a unique material developed from root structure (Mycelium) of mushroom. Mycelium has a filamentous network structure with mechanics largely controlled by filament elasticity and branching, and network density. We report the morphological and mechanical characterization of mycelium. The monotonic mechanical behavior of the mycelium is non-linear both in tension and compression.'s picture

The 7th edition of the International Conference on Fatigue of Composites (ICFC7)

The 7th edition of the International Conference on Fatigue of Composites is going to be held in Vicenza (Italy) from 4th to 6th of July 2018. The conference is organized by the Department of Management and Engineering at the University of Padova, under the patronage of the European Society for Composite Materials, the Committee on Composite Materials of the Japan Society of Material Science, the Italian Association for Stress Analysis and the Italian Group of Fracture.

oliver oreilly's picture

A Geometric Perspective on Gimbal Lock in the Apollo program

The phenomenon of gimbal lock rose in prominence during the time  of NASA's Apollo program. Inside the inertial measurement unit of the Apollo spacecraft was a stable (inertial) platform about which the spacecraft rotated. The hinged platform was suspended in two gimbals to give it three degrees of freedom. Its role was to give an accurate measure of the spacecraft's orientation. At a particular orientation of the spacecraft, the gimbals became coplanar and control torques became ineffective at stabilizing the platform.

karelmatous's picture

Solving Nonlinear PDEs with a priori accuracy using wavelets

We present a numerical method which exploits the biorthogonal interpolating wavelet family, and second-generation wavelets, to solve initial–boundary value problems on finite domains. Our predictor-corrector algorithm constructs a dynamically adaptive computational grid with significant data compression, and provides explicit error control. Error estimates are provided for the wavelet representation of functions, their derivatives, and the nonlinear product of functions.

distortion control in continum shell elements

Choose a channel featured in the header of iMechanica: 


I am new to abaqus and am simulating biiaxial test on GFRP cross ply laminates. The simulation stops saying " excessive distortion of 2 elements". Can someone please suggest a detailed solution. 

Ps- im a beginner , so I request a detailed suggestion please.




Jingjie Yeo's picture

Multiscale modeling of keratin, collagen, elastin and related human diseases: Perspectives from atomistic to coarse-grained molecular dynamics simulations Scleroproteins are an important category of proteins within the human body that adopt filamentous, elongated conformations in contrast with typical globular proteins. These include keratin, collagen, and elastin, which often serve a common mechanical function in structural support of cells and tissues. Genetic mutations alter these proteins, disrupting their functions and causing diseases.

shimahajimirza's picture

Open Post-doc position at Energy- Control and optimization lab

Energy, Control and Optimization (ECO) lab in the Department of Mechanical Engineering at Texas A&M University has one post-doc position. The research project is about energy conversion in Nano-materials and thin film solar cells. Candidates should have a strong background and interests in Radiative Heat Transfer, Nano-Materials, Nanofabrication, Computational Methods and Machine Learning. Programming experience in MATLAB or Python is necessary.

Vivekanandan A's picture

Using LEFM for analyzing crack in a non linear material

Dear all,

I am trying to find the crack tip SIF in Polyurethane which an elastomer. It behaves like a nonlinear elastic material with the initial small linear elastic region. Can I use a multi-parameter stress field equation (William's crack tip stress field equation) to get the SIF of the crack tip.

Thank you

Jingjie Yeo's picture

Advancing the frontiers of silk fibroin protein-based materials for futuristic electronics and clinical wound-healing (Invited review) The present review will introduce the basic concepts of silk-based electronics/optoelectronics including the latest technological advances on the use of silk fibroin in combination with other functional components, with an emphasis on improving the performance of next-generation silk-based materials. It also highlights the patterning of silk fibroin to produce micro/nano-scale features, as well as the functionalization of silk fibroin to impart antimicrobial (i.e. antibacterial) properties.


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