In a set of recently published papers, the first in Nature Materials and the second in Advanced Engineering Materials , we investigate methods for designing, fabricating, and testing a new class of nano-architected lattice structures, which we refer to as nanolattices. These nanolattices are comprised of hollow tubes with lengths on the order of microns, diameters on the order of hundreds of nanometers to microns, and wall thicknesses on the order of tens to hundreds of nanometers. During the fabrication, we have a high degree of control over the geometry of the structure, the dimensions of the tubes (both the diameter and the wall thickness), and the overall size of the structure. Depending on the constituent material being used, there is the potential to tune the thickness of the tubes in a way such that a material size effect can be exploited. There are a number of different geometries that have been designed and are currently being tested, and they can be seen here. The successful fabrication and testing of architected nanolattice structures on this scale, and with this degree of fidelity, constitutes a breakthrough in materials engineering. Using advanced two-photon lithography techniques to make materials with high structural strength in combination with materials size-effects, we have begun to reach into an entirely new material parameter space.
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I would like to share with fellow mechanicians an educational iPad app I recently developed. The name of the app is Truss Me! and the main goal is to help students, all the way from high school to college, to build intuition on how truss structures behave. The video below highlights some features of the app:
The app utilizes state of the art simulation techniques to provide
how i can apply seismic load (acceleration) to boundary of a 2d shell with acoustic element?
Deadline extended: Call for abstracts and special issue papers: Computational mechanics of cells, tissues, and biomaterialsSubmitted by azadpoor on Fri, 2013-12-06 11:04.
We would be pleased to have a contribution from you or from one of the
members of your group among the presentations of the symposium entitled
COMPUTATIONAL MECHANICS OF CELLS TISSUES AND BIOMATERIALS
organized within the joint World Congress on Computational Mechanics and European Conference on Computational Mechanics (http://www.wccm-eccm-ecfd2014.org/frontal/default.asp )
to be held on 20-25 July 2014 in Barcelona (Spain).
Published ASAP, Nano Letters (2013)
I have implemented a DG code for linear elasticity. If I solve Ku=f, then I obtained a correct result (compared with a continuous Galerkin method). However if I used a Newton-Raphson (NR) method to solve the equilibriuum equation, although I still got a correct result, the convergence of NR was bad: I needed 3 or 4 iterations for linear elasticity!!! The young modulus is 3e7 and the stabilization parameter is 3e9. If a larger value of 3e10 was used for the stabilization parameter, it converged in 2 iterations.
For your information, I am using the Symmetric Interior Penalty Method or Nitsche's method. And the material is compressible.
I want to define node-based-surface in Python script to use it in *tie card. Please help. Thank you
please , can you help me getting links to download free material library ?
Is there some good data base for materials dedicated to FEA ?
Thank you for any help.
Ying Li, Wylie Stroberg, Tae-Rin Lee, Han Sung Kim, Han Man, Dean Ho, Paolo Decuzzi, Wing Kam Liu
Dr. Steven Kurtz, Exponent, Inc., and Drexel University, USA will be the Plenary Speaker at ICoBT2014
Keynote Speakers include:
Dr. Siegfried Derler, EMPA, Switzerland
Professor Jeremy Gilbert, Syracuse Biomaterials Institute, USA
Dr. Jason Stokes, The University of Queensland, Australia
Professor Yu Tian, Tsinghua University, China
i am new usre of abaqus, i try to model tunnel adjacent to reservior
- 2D model
- BCs: boundary of tunnel and reservior with rock assume be rigid (model with analytical rigid and tie to tunnel and reservior),
upstream of reservior have impedance and free surface of reservior have zero pressur.
steps: initial, dynamic implicit
- Load: earthquake acceleration apply to rigid boundary
How to get the update the local material coordinate in large deformation for hyperelasitc rubber-like materials?Submitted by Jiang Chen on Wed, 2013-12-04 13:57.
I want to ask things about the updation of local material coordinate in large deformation.
Does there exist two ways for this?
1. Polar decomposition of Gradient Deformation Tensor F to get the rotation tensor.
2. Update each basis vector of local material coordinate system using modified Gradient Deformation Tensor F_bar = F*J^(-1/3).
What I cared about is the second method, is the second method available?
I was reading the Bernard Shutz's book on Geometrical Methods in Mathematical Physics. It is an excellent book on the subject; however there should exist an auxiliary source whenever it is needed. I wonder where I can find more information about Fiber Bundles and their applications in mathematical physics.
Symposium: "Validated Materials Modeling with Quantified Uncertainties Across Scales and Physics" at WCCM-14 in Barcelona, SpainSubmitted by Jaime on Wed, 2013-12-04 00:43.
The 11th World Congress on Computational Mechanics will be held 20-25 July 2014 in Barcelona, Spain.
We cordially invite you to submit an abstract to present your work in the minisymposium “Validated Materials Modeling with Quantified Uncertainties Across Scales and Physics” at http://www.wccm-eccm-ecfd2014.org. A detailed description of the minisymposium is attached below. The deadline for the abstract submission is December 15, 2013.
Please fee free to forward this information to colleagues who might be interested in attending.
KAUST (King Abdullah University of Science and Technology)
Open Position as Optoelectronics Lab Engineer
Competitive Tax-free Salary
Just to let you know that we are making a call for papers for the minisymposium Computational Techniques and Simulation of ....Submitted by jlcurie on Tue, 2013-12-03 12:22.
The Multiscale Design Systems, LLC (http://www.multiscale.biz/) has an opening for a Multiscale Scientist position in multiscale modeling and simulation of composites and metals.
Required qualifications for this positions are as follows:
1. A PhD degree mechanics or related engineering discipline.
2. Strong background in solid mechanics, finite elements, multiphysics and multiscale modeling.
3. Proficiency in Fortran, C, C++ and established record in code development.
4. Provide Technical Leadership.
5. Good communication skills.
A postdoctoral research positions is open for application
An enthusiastic and highly motivated postdoctoral scientist is sought to work on water desalination using nanostructured membranes at Nanyang Technological University, Singapore.
The candidates should have rich experiences in relevant research areas, good publication records, and excellent writing skills. Preference will be given to those with experience in molecular dynamics simulation. The contract will be one year and renewable subject to performance.
One PhD student position is available at Monash University Malaysia on mechanical properties of epoxy nanocomposites.
We expect students with the knowledge and experience in at least two of the following skills:
The Uniaxial Tensile Response of Porous and Microcracked Ceramic Materials
Amit Pandey,§,*,†,‡ Amit Shyam,§,* Thomas R. Watkins,§,* Edgar Lara-Curzio,§,** Randy J. Stafford,¶,* and Kevin J. Hemker||
I have been trying to model the surface interaction between two blocks of material using surface-based cohesive elements (*cohesive behavior). This works well in ABAQUS CAE (standard) when I set the material properties as "Mechanical, Elastic" so no problem with that.
However, I would now like to use the material properties from a fortran code. To do this, I was planning on defining the elements using *UEL with an overlay to record all the values. Is this compatible with cohesive zone elements?
Many thanks for your help,