research
Journal Club Theme of May 2013: Mechanics of biological and bio-inspired supramolecular assemblies
Submitted by lar739 on Sat, 2013-05-04 16:50.Supramolecular assemblies are dynamic structures composed of simple molecular building blocks that self-assemble into hierarchically organized complexes driven by reversible (weak) intermolecular interactions (e.g. hydrogen bonds). This bottom-up approach to materials synthesis is utilized in nature to create flaw tolerant, highly functional materials that exhibit extraordinary mechanical properties arising from parallel clusters of weak interactions such as hydrogen bonds that work collectively. Such geometric arrangements are observed in stable biomolecular assemblies such as spider’s silk and amyloid plaques (see for instance an earlier journal club entry on protein materials http://imechanica.org/node/2653 ).
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Isogeometric Analysis (IGA)
Submitted by vinh phu nguyen on Thu, 2013-05-23 10:06.The aim of this post is to give a brief introduction to the recently emerged isogeometric analysis (IGA) which was presented in the seminal paper " Hughes, T.J.R.; J.A. Cottrell, Y. Bazilevs (2005). "Isogeometric analysis: CAD, finite elements, NURBS,exact geometry and mesh refinement". Comput. Methods Appl. Mech. Engrg. (Elsevier) 194: 4135–4195." IGA refers to a computational framework in which the basis functions used to represent the geometry in CAD are used for approximating the unknown fields in FEA. In this regard, IGA also employs the well known isoparametric concept.
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How to combine existing material models in Abaqus ?
Submitted by saberelarem on Sat, 2013-05-18 23:57.Hi, I would like to know if it is possible in abaqus to assemble mutually exclusive material (as per the error message) .
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Anomalous plasticity in the cyclic torsion of micron scale metallic wires
Submitted by Dabiao Liu on Sat, 2013-05-18 14:59.
Our new paper entitled "Anomalous
plasticity in the cyclic torsion of micron scale metallic wires" has been
accepted by PRL
(see:
http://prl.aps.org/accepted/3f070Y37M7a1003ff5a406b3682fb86122bc26bd4)
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ANSYS v13
Submitted by knaguib on Sat, 2013-05-18 07:16.I need help in ANSYS 13 (Mechanical APDL interface), If anyone has an example or tutorial for modeling of reinforced concrete beam with discrete reinforcement using non-linear material definition, please provide on my E-mail: eng.karim.naguib@gmail.com
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ABAQUS-cohesive elements in compression
Submitted by s_gupta on Fri, 2013-05-17 08:59.Hi all,
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Corrosion and Materials in the Oil and Gas Industries
Submitted by Henry Tan on Thu, 2013-05-16 20:06.The book “Corrosion and Materials in the Oil and Gas Industries”, edited by Reza Javaherdashti, Chikezie Nwaoha and Henry Tan, has been published by CRC Press/Taylor and Francis LLC, USA.
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Corrosion and Materials in the Oil and Gas Industries
Submitted by Henry Tan on Thu, 2013-05-16 10:41. The book “Corrosion and Materials in the Oil and Gas Industries”, edited by Reza Javaherdashti, Chikezie Nwaoha and Henry Tan, has been published by CRC Press/Taylor and Francis LLC, USA.
http://imechanica.org/user/971
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ANSYS Explicit STR vs. ANSYS LS-DYNA vs. ANSYS AUTODYN
Submitted by MGRashed on Wed, 2013-05-15 18:45.I want to use Explicit FEA in blast/impact analysis. Looking up at Ansys, it seems that it has 3 explicit code.
Why 3 separate code and more importantly what is the difference among ANSYS Explicit STR, ANSYS LS-DYNA and ANSYS AUTODYN?
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Abaqus Concrete Damaged Plasticity Model
Submitted by giuliozani on Wed, 2013-05-15 17:07.Hi everybody,
I'm trying to simulate the structural behavior of High Performance Fiber Reinforced Concrete specimens by means of the Concrete Damaged Plasticity Model.
My constitutive relation is represented by a multilinear law, with a nonlinear pre-peak followed by a softening branch.
Mechanical Analysis of Eyelid Morphology
Submitted by Liangliang Zhu on Tue, 2013-05-14 05:01.Liangliang Zhu and Xi Chen, Acta Biomaterialia (2013)
From a mechanical instability perspective, a double-eyelid is a double-folded thin film structure on a curved substrate, caused by compression as the film “slides” on the substrate. The underlying mechanics issues, in particular the requirements for forming a double-folded structure, are studied using a modeling/simulation framework. A minimalist model is employed to explore the wrinkle-to-fold transition. Refined and enriched models are further developed based on anatomical structures, which demonstrate three critical factors for the formation of double-layer folding of the eyelid. First, a crease line in the eyelid is essential where the local bending rigidity is relatively weak. Second, the skin above the crease line should be thin and wide enough. Third, the skin below the crease line should be possessed with relatively large effective stiffness so it can be lifted as a whole when eyes open. When the eye is opened beyond about 40% of its initial wrinkle wavelength, the double-folded structure emerges. Various types of eyelid morphologies are discussed based on the mechanistic model. The study provides useful insights for surgery, cosmetics, morphogenesis, as well as microfabrication.
Simulation of the double (up) and single (down) eyelid.
"
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Abaqus UMAT Problem (Fick's second law in Abaqus)
Submitted by eddie32 on Tue, 2013-05-14 02:57.Hello.
Could anyone tell me how to achieve the basic unsteady diffusion equation (Fick's second law) of some solute for a given Abaqus model by UMAT & User-defined field in Abaqus? or some other subroutines?
Is there any reference good for this problem ?
Thanks very much!
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Simulation of the outer and inner double eyelid.
Submitted by Liangliang Zhu on Mon, 2013-05-13 02:06.The simulation, a whale’s eyelid, a horse’s eyelid and a human’s eyelid, from left to right.
Submitted by Liangliang Zhu on Mon, 2013-05-13 02:02.Transition of morphology of the refined model for the double eyelid. A line defect (indicated by the arrow) is implemented.
Submitted by Liangliang Zhu on Mon, 2013-05-13 01:53.Optimised determination of viscoelastic properties using compliant measurement systems
Submitted by andrewjw on Fri, 2013-05-10 11:19.- andrewjw's blog
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Buckling-Induced Reversible Symmetry Breaking and Amplification of Chirality Using Supported Cellular Structures
Submitted by Sung Hoon Kang on Tue, 2013-05-07 19:03.- Sung Hoon Kang's blog
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XFEM Location of Crack Tip
Submitted by paulamil on Mon, 2013-05-06 21:29.In using Abaqus 6.12 XFEM software is there a field output request that can be specified to track the location of the crack tip as a crack grows through time?
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A unique service for thin films experimentalists
Submitted by Aman Haque on Mon, 2013-05-06 20:37.Dear Experimentalist Colleague:
I would like to make you aware of a unique service on thin film specimen preparation for mechanical, electrical and thermal characterization. We are floating the idea of procuring specimen preparation service, customized to your needs and the current characterization tool you use. Whether you have the expertise and infrastructure or not, micro/nanoscale specimen preparation remains to be a bottle neck; something you wished to replace with more experiments, analysis and innovation. I apologize for this sales pitch, but I hope you will try it to assess the value. Attached is a flyer for more information. Sincerely,
Aman Haque
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Arguments for Drucker Prager creep model with user defined law??
Submitted by sud1986 on Mon, 2013-05-06 19:13.Hey all,
I am trying to use Drucker Prager plasticity with Tension hardening model for my material in Abaqus. In addition, I want to use the Drucker Prager creep with user defined (user) law that is via creep subroutine. But when I try to choose the Drucker Prager creep in the Abaqus CAE, it gives an error, "not all required arguments specified; expected 1, got 0." I am not able to follow what arguments it is asking for when I am using a user defined law. Any help regarding the same will be greatly appreciated. Thank you.
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simulation of precision glass molding
Submitted by Vijaykumar Chauhan on Mon, 2013-05-06 14:15.Hi every one . I am working on Simulation of precision glass molding process with the help of Abaqus . Do any one have idea to simulate the glass at temprature 1400oC ? Please send me any usefull material regarding it.
Kind Regards
Vijay
Inhomogeneous Large Deformation Study of Temperature-Sensitive Hydrogel
Submitted by Ding Zhiwei on Sun, 2013-05-05 15:03.
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Analysis of microstructural induced enhancement of electromechanical coupling in soft dielectrics
Submitted by Stephan Rudykh on Thu, 2013-05-02 17:16.Electroactive soft elastomers require huge electric field for a meaningful actuation. We demonstrate, by means of numerical simulation, that this can be dramatically reduced and large deformations can be achieved with suitably designed heterogeneous actuators. The mechanism by which the enhancement is attained is illustrated with the aid of both idealized and periodic models.
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