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On Eshelby's Inclusion Problem in Nonlinear Anisotropic Elasticity

Submitted by arash_yavari on
research
eigenstrain
anelasticity
Nonlinear elasticity
inclusion
Geometric mechanics
Material Manifold

The recent literature of finite eignestrains in nonlinear elastic solids is reviewed, and Eshelby's inclusion problem at finite strains is revisited. The subtleties of the analysis of combinations of finite eigenstrains for the example of  combined finite radial, azimuthal, axial, and twist eigenstrains in a finite circular cylindrical bar are discussed. The stress field of a spherical inclusion with uniform pure dilatational eigenstrain in a radially-inhomogeneous spherical ball made of arbitrary incompressible isotropic solids is analyzed.

Curvature tunes wrinkling in shells

Submitted by Fan Xu on
research
hyper elasticity
finite strain
differential geometry

Transverse wrinkles usually emerge in a uniaxially stretched elastic film and can be suppressed upon further tension, which is an instability-restabilization behavior due to the nonlinear competition between stretching energy and bending energy. Here, we show that curvature can effectively and precisely tune the wrinkling localization and amplitude.

LAMMPS tutorials on the simulations of shock wave propagation and ballistic impact

Submitted by Nuwan Dewapriya on
research
Ballistic Impact Response
Ultrahigh Strain Rates
Shock Wave Propagation
molecular dynamics
Spallation

We are currently investigating the shock response of materials using molecular dynamics (MD). This project showed us that the preparation of properly equilibrated MD models can be very challenging even for someone with a strong background in molecular modeling. Therefore, we thought of sharing some of our recent MD models with the research community. We would like to share the LAMMPS input and data files required to run MD simulation of shock wave propagation and ballistic impacts. The two MD models are shown above.

Multi-physics modeling and finite element formulation of corneal UV cross-linking

Submitted by Shuolun Wang on
research

The UV cross-linking technique applied to the cornea is a popular and effective therapy for eye diseases such as keratoconus and ectatic disorders. The treatment strengthens the cornea by forming new cross-links via photochemical reactions and, in turn, prevents the disease from further developing.

Fault Diagnosis of an Automobile Cylinder Block with Neural Process of Modal Information

Submitted by Payam Soltani on
research
fault diagnosis; Artificial Neural Networks ; Vibrations;

Fault Diagnosis of an Automobile Cylinder Block with Neural Process of Modal Information

Online link to paper: 

http://ijens.org/Vol_21_I_02/210102-4848-IJMME-IJENS.pdf

Absract:

Rapid synchronized fabrication of vascularized thermosets and composites

Submitted by xiangzhang on
research
Advanced Manufacturing
multiphysics modeling
concurrent polymerization and vascularization

Dear colleagues,

We are happy to share a recent collaborative study on experimental and numerical investigation of  rapid synchronized fabrication of vascularized thermosets and composites. This study demonstrated that a thermoset polymer or polymer composites with embedded microvascular systems can be fabricated in a single step, using a self-propagating polymerization reaction front.  For more details, please see: https://www.nature.com/articles/s41467-021-23054-7

Nanotwin-induced strengthening in silicon: A molecular dynamics study

Submitted by mohsenzaeem on
research
Nanotwin; silicon; molecular dynamics

Mechanical performance of silicon nanopillars with homogeneous and gradient nanotwinned structures are investigated through a series of molecular dynamics simulations. The most observed Σ3 twin boundary (TB) with two preferable (lowest surface energy) planes of {111} and {001} are used to generate homogeneous and gradient nanotwinned structures. Simulations of compression and tension of nanotwinned pillars reveal an extra strengthening behavior due to the addition of Σ3 TBs when compared to the single crystalline nanopillar without any TBs.

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