Postdoc position is available at DTU Wind Energy, the Section for Composite Mechanics and Structures.
The position is in the framework of Innovation Foundation project “DURALEDGE/ Durable leading edges for high tip speed wind turbine blades".
Several postdoctoral and graduate student openings with primary focus on biomechanics is available immediately in the Shenoy Research Group at the University of Pennsylvania. We are looking for strongly motivated candidates to work on NIH supported projects on a) cell-matrix interactions in fibrosis and cancer and 2) mechanical mechanisms of traumatic brain injury.
We have an immediate opening for a research engineer (postdoctoral researcher) to perform research on the physical and mechanical properties of energy storage materials.
Requirements:
·Experience in performing experimental mechanical testing in conjunction with computation mechanics analysis (e.g., finite element)
·U.S. Citizenship is required
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A new family of mixed finite element methods --- compatible-strain mixed finite element methods (CSFEMs) --- are introduced for three-dimensional compressible and incompressible nonlinear elasticity. A Hu-Washizu-type functional is extremized in order to obtain a mixed formulation for nonlinear elasticity. The independent fields of the mixed formulations are the displacement, the displacement gradient, and the first Piola-Kirchhoff stress. A pressure-like field is also introduced in the case of incompressible elasticity.
in Computer Methods in Applied Mechanics and Engineering
Please take a look at our newest paper in Extreme Mechanics letters. In this paper we investigate why Peano-HASEL (Hydraulically Amplified Self-healing Electostatic) actuators zip inhomogeneously at large loads. We develop a theoretical model to explain the phenomenon and validate it experimentally. We show that inhomogeneous zipping increases the blocking force of Peano-HASEL actuators by ~50% compared to homgenous zipping. Even though our analysis is limited to Peano-HASEL actuators, the physical principle is valid for other geometries of HASEL acutators, too.
Multiple PhD positions are now available in the department of Mechanical Engineering at the University of Vermont starting Fall 2020. Successful candidates will be under the supervision of Dr. Jihong Ma. Dr. Ma’s research focuses on understanding the physical properties of materials with complex structures at multiple scales (from nano- to macroscale) via a combination of theoretical analysis, numerical simulations and experimental characterizations. The goal is to uncover or enhance material performance characteristics for industrial, medical, and aerospace applications.
We develop and demonstrate the first general computational tool for finite deformation static and dynamic dislocation mechanics. A finite element formulation of finite deformation (Mesoscale) Field Dislocation Mechanics theory is presented. The model is a minimal enhancement of classical crystal/J_2 plasticity that fundamentally accounts for polar/excess dislocations at the mesoscale. It has the ability to compute the static and dynamic finite deformation stress fields of arbitrary (evolving) dislocation distributions in finite bodies of arbitrary shape and elastic anisotropy under general boundary conditions. This capability is used to present a comparison of the static stress fields, at finite and small deformations, for screw and edge dislocations, revealing heretofore unexpected differences. The computational framework is verified against the sharply contrasting predictions of geometrically linear and nonlinear theories for the stress field of a spatially homogeneous dislocation distribution in the body, as well as against other exact results of the theory. Verification tests of the time-dependent numerics are also presented. Size effects in crystal and isotropic versions of the theory are shown to be a natural consequence of the model and are validated against available experimental data. With inertial effects incorporated, the development of an (asymmetric) propagating Mach cone is demonstrated in the finite deformation theory when a dislocation moves at speeds greater than the linear elastic shear wave speed of the material.
Paper can be found at link Finite_Deformation_Dislocation_Mechanics.
