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coolbarhate's picture

Secret of high strength and toughness of abalone seashell

Among all inspiring bio-material, Abalone seashell has its unique characteristics of high strength and toughness. Though , there is the general trend in materials that some of the toughness have been compromised for the sake of increasing hardness and vice versa. This astonishing property of sea shell attracts material scientists to understand the root cause for this property. One of such enthusiast, Prof. Kalpana Katti at North Dakota State University unlocked these secret of these phenomenon lies in its microstructure.

Non-linear analysis convergence in ANSYS workbench static structural

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Hi,

Please pour in uselful tips & tricks to arrive at convergence in ANSYS workbench static structural. This for Finite Element Analysis in static structural of biomechanical components.

 

Thank You

Bharath

a.dorbane's picture

Mechanical, microstructural and fracture properties of dissimilar welds produced by friction stir welding of AZ31B and Al6061

Friction stir welding (FSW) has been used for joining AZ31B magnesium alloy and Al 6061-T6 aluminum alloy sheets. In this regard, the current work aims to study the mechanical, microstructural and fracture properties of dissimilar FSW welds obtained by evolving the tool rotation and translation speeds. The dissimilar welds microstructure and mechanical properties are evaluated and correlated with the FSW parameters to obtain the optimum weld conditions. The results showed that placing aluminum on the advancing side of the weld resulted in better quality welds.

a.dorbane's picture

Microstructural observations and tensile fracture behavior of FSW twin roll cast AZ31 Mg sheets

Defect-free joints were friction stir welded (FSW) from AZ31 Mg alloy sheets by employing optimum welding parameters for the tool geometry used. Microstructure, texture and mechanical response of the welded joints were studied to identify susceptibility of crack initiation in the different weld zones and to understand the overall fracture behavior of these welds.

a.dorbane's picture

Observations of the mechanical response and evolution of damage of AA 6061-T6 under different strain rates and temperatures

Investigated in this paper is the mechanical and microstructural response of specimens cut from rolled AA 6061-T6 alloy subjected to uniaxial loading at different temperatures (25, 100, 200, and 300 °C) and strain rates (10–4, 10−3, 10−2, 10−1 s−1). It was found that the material exhibits a strain rate and temperature dependent behavior. Microstructure observations reveal grains elongated in the loading direction with the average grain size being independent of loading conditions.

marco.paggi's picture

Facebook web-page of MUSAM online

Dear Colleagues,

for those of you interested in being continuously updated on the activities of the Research Unit MUSAM on Multi-scale Analysis of Materials at the IMT School for Advanced Studies Lucca, research publications and open positions, please visit and join with your 'like' the new Facebook web page of MUSAM :

https://m.facebook.com/fanpagemusam

Thank you and best regards,

Marco Paggi 

Research Unit Director 

Adding external vibration to a dynamic analysis

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I am trying to simulate an experiment in which a steel plate is excited using sound vibration to measure its natural frequencies and vibration patterns. Even if modal frequency analysis of the test gave results, it was not satisfactory. Therefore, the external vibration with a controlled frequency is required to be included in the FEA model. FYI, gravity load will also be considered.

I would appreciate any help, specially related to ABAQUS. If there is no way of doing this in ABAQUS, suggestion of any other FEA software would be fine.

Thanks in advance.

bitamendi's picture

Experimental characterization of the heat transfer coefficient for hot stamping/ press hardening applications

Dear all, 

We just got published a new work titled " EXPERIMENTAL CHARACTERIZATION OF THE HEAT TRANSFER COEFFICIENT UNDER DIFFERENT CLOSE LOOP CONTROLLED PRESSURES AND DIE TEMPERATURES"

 

Abstract

farzin's picture

Linking Abaqus 2016 with Parallel Studio Composer 2016 +Visual Studio 2015

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Dear all,

Hi,

Any help on linking Abaqus 2016 with Intel Parallel Studio composer 2016 and Visual Studio 2015 would be appreciate.

(Note:I can't use older version of compiler as their producers (Microsoft & Intel) will not support liscence for older versions any more.)

Tq.

Farzin

S. Beretta's picture

Simulation of crack growth in Ni-based single crystals

In a cooperative research between PoliMi and UIUC we have analyzed the crack growth in Ni-based single crystals:

http://www.sciencedirect.com/science/article/pii/S0142112316000840

 Crack growth experiments analyzed with DIC had shown relatively low closure levels respect to polycrystals. Crystal plasticity simulations with WARP3D have been able to simulate closure levels consistent with the experimental ones.

Calculation of Elastic Modulus of Graphene in LAMMPS

Hello everyone, I want to calculate elastic constants (C11, C22, C12, and C66) for a single layer graphene sheet by MD simulation in LAMMPS. I am using the following equation:

 

 E = (C11*C22-C12*C21)/C22 and poisson ratio = C12/C22 from this paper:

 http://www.sciencedirect.com/science/article/pii/S0261306909003082

Calculation of Elastic Modulus of Graphene in LAMMPS

Choose a channel featured in the header of iMechanica: 

 

Hello everyone, I want to calculate elastic constants (C11, C22, C12, and C66) for a single layer graphene sheet by MD simulation in LAMMPS. I am using the following equation:

 

E = (C11*C22-C12*C21)/C22 and poisson ratio = C12/C22 from this paper:

 http://www.sciencedirect.com/science/article/pii/S0261306909003082

Jingjie Yeo's picture

Adsorption and Conformational Evolution of Alpha-Helical BSA Segments on Graphene: A Molecular Dynamics Study

http://dx.doi.org/10.1142/S1758825116500216 Molecular dynamics (MD) simulations are performed to investigate the adsorption mechanics and conformational dynamics of single and multiple bovine serum albumin (BSA) peptide segments on single-layer graphene through analysis of parameters such as the root-mean-square displacements, number of hydrogen bonds, helical content, inter- action energies, and motions of mass center of the peptides.

Harold S. Park's picture

Negative Poisson's Ratio in Single-Layer Graphene Ribbons

The Poisson's ratio characterizes the resultant strain in the lateral direction for a material under longitudinal deformation.  Though negative Poisson's ratios (NPR) are theoretically possible within continuum elasticity, they are most frequently observed in engineered materials and structures, as they are not intrinsic to many materials.  In this work, we report NPR in single-layer graphene ribbons, which results from the compressive edge stress induced warping of the edges.

Zheng Jia's picture

Failure Mechanics of a Wrinkling Thin Film Anode on a Substrate under Cyclic Charging and Discharging

Zheng Jia, Teng Li, Failure Mechanics of a Wrinkling Thin Film Anode on a Substrate under Cyclic Charging and Discharging, Extreme Mechanics Letters, accepted, 2016 (DOI:doi:10.1016/j.eml.2016.03.006)

 

Pattern formation in plastic liquid films on elastomers by ratcheting

See our newly discovered phenomena, Pattern formation in plastic liquid films on elastomers by ratcheting

Here is the abstract:

Ali Ramazani's picture

Quantification of GNDs in DP steels (with three developed criteria)

The current work aims to predict the work-hardening behavior of dual-phase (DP) steel, focusing on the effect of transformation-induced geometrically necessary dislocations (GNDs). Equiaxed and banded microstructures were produced through suitable heat treatment cycles in a laboratory. Electron backscatter diffraction measurements were performed to characterize GNDs. The flow behavior was modeled within the micro-scale finite element method, considering the effect of the microstructures using the representative volume element (RVE) approach.

Arash_Yavari's picture

A Geometric Theory of Nonlinear Morphoelastic Shells

We formulate a geometric theory of nonlinear morphoelastic shells that can model the time evolution of residual stresses induced by bulk growth. We consider a thin body and idealize it by a representative orientable surface. In this geometric theory, bulk growth is modeled using an evolving referential configuration for the shell (material manifold). We consider the evolution of both the first and second fundamental forms in the material manifold by considering them as dynamical variables in the variational problem.

Ali Ramazani's picture

Correlation between 2D and 3D flow curve modelling of DP steels using a microstructure-based RVE approach

Since real specimens deform three-dimensionally, 2D modeling approaches cannot predict the flow curve of the material precisely. The predicted flow curves obtained from 2D modeling can, however, be correlated to the 3D ones by introducing a correlation factor, We quantified by the stress ratio (σ3D/σ2D) based on the 2D and 3D RVE calculations for DP600 steels with various martensite phase fractions (Vm=0–50%) at different equivalent plastic strains varying from εpeq=0 to 0.1.

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