research
On axisymmetric/diamond-like mode transitions in axially compressed core-shell cylinders
Recent interests in curvature- and stress-induced pattern formation and pattern selection motivate the present study. Surface morphological wrinkling of a cylindrical shell supported by a soft core subjected to axial compression is investigated based on a nonlinear 3D finite element model. The post-buckling behavior of core-shell cylinders beyond the first bifurcation often leads to complicated responses with surface mode transitions. The proposed finite element framework allows predicting and tracing these bifurcation portraits from a quantitative standpoint.
Generate master curve for viscoelasticity
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Hello,
I would like to generate a master curve (e.g. of the storage modulus) based on frequency-sweeps experiment for different temperatures.
Basically, I need to determine the shifts in order to construct the master curve. I want to automatize the process with Matlab, instead of shifting the data by hand. And I don't want to use WLF or Arrhenius methods.
I want to determine the shifts for each temperature s.t. I get a smooth master curve (minimize the error using least square).
How do I rectify an error regarding memory storage when I generate substructures in ABAQUS?
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I have been trying to generate a substructure in ABAQUS for a big diameter roller bearing. I have used two reference points, one each for inner and outer raceways to couple the inner and outer raceway surfaces. I have two steps in the analysis. The first step is Frequency followed by Substructure generation step. The analysis runs fine till the end of first step and calculates the eigen frequencies. When the second step starts, following error message appears.
" Element 439473 requires more than 2GB of memory for storage"
How to analysis Fatigue of shaft using Ansys or Ncode designlife?
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I use ANSYS APDL with code for my shaft with two coating layers(interlayer and coating layer). I already analysis stress of shaft with Ansys. the result is ok and i exported to .RST file. But , when i input my shaft to Ncode, I can't find the interlayer and coating layers.I think this shaft have 3 part(subtrate, interlayer, coating layer)
!substrate materials
Young's modulus (Mpa): 2.1e5
Poisson's ratios:0.3
Density(ton/mm3):8.03e-9
! interlayer material
Young's modulus (Mpa): 3,2e5
Poisson's ratios:0.31
Density(ton/mm3):8.908e-9
Yield behaviour of trabecular bone
A recently published paper "Evaluating the macroscopic yield behaviour of trabecular bone using a nonlinear homogenisation approach" links the micromechanics of bone to its macroscopic behaviour. The paper may be of interest to colleagues on this forum. The abstract is provided below.
Abstract:
Fracto-emission in lanthanum-based metallic glass microwires under quasi-static tensile loading
Plastic deformation in metallic glasses is highly localized and often associated with shear banding, which may cause momentary release of heat upon fracture. Here, we report an explosive fracture phenomenon associated with momentary (∼10 ms) light emission (flash) in Lanthanum-based (LaAlNi) metallic glass microwires (dia. ∼50 μm) under quasi-static tensile loading.
2016 Ted Belytschko Applied Mechanics Award - Professor Andrea Prosperetti
The Executive Committee of the ASME Applied Mechanics Division is pleased to announce and congratulate Professor Andrea Prosperetti, Charles A. Miller, Jr. Distinguished Professor of Mechanical Engineering, Johns Hopkins University, as the recipient of the 2016 Ted Belytschko Applied Mechanics Award.
2016 Thomas J.R. Hughes Young Investigator Award - Professor Pedro M. Reis
The Executive Committee of the ASME Applied Mechanics Division is pleased to announce and congratulate Professor Pedro M. Reis, Gilbert W. Winslow Associate Professor, Massachussetts Institute of Technology, as the recipient of the 2016 Thomas J. R.