Ramathasan Thevamaran's blog

Dear Colleagues,

I invite you to read our recent study published in the Physical Review Applied: https://doi.org/10.1103/PhysRevApplied.21.054022

Abstract:

Dear Colleagues,

Dear Colleagues,

Abstract

Background: Helmet systems most commonly experience oblique blunt impacts which cause simultaneous linear and rotational accelerations. The ability to attenuate both linear and rotational accelerations by absorbing the normal shock while accommodating large shear deformations with energy dissipation is critical to developing superior helmet liners that prevent traumatic brain injury (TBI).

Dear Colleagues,

Please see our recent article on toughening 3D printable resins with block copolymer additives:

Abstract

Dear Colleagues,

The Department of Mechanical Engineering (ME) at the University of Wisconsin-Madison is seeking applicants for a tenure-track Assistant Professor in the area of experimental fluid dynamics with applications to aerodynamics, turbulence, wind energy, flow control, bio-inspired flows, or related fields. Please see the job description here: https://jobs.wisc.edu/jobs/assistant-professor-in-fluid-dynamics-madison-wisconsin-united-states

Dear Colleagues,

The Department of Mechanical Engineering at the University of Wisconsin, Madison seeks candidates in polymer and composite processing and engineering to join their interdisciplinary advanced manufacturing group as a tenure-track Assistant Professor. Please see the job description here: https://jobs.wisc.edu/jobs/assistant-professor-in-polymers-and-composites-madison-wisconsin-united-states

Dear Colleagues,

The Department of Mechanical Engineering at the University of Wisconsin-Madison invites applications for a tenure-track Assistant Professor position in structural dynamics. Please see the job description here: https://jobs.wisc.edu/jobs/assistant-professor-in-structural-dynamics-madison-wisconsin-united-states

Dear Colleagues,

I invite you to read our recent publication in the Journal of Physics: Materials: https://iopscience.iop.org/article/10.1088/2515-7639/ace381

By: Ramathasan Thevamaran (Theva)

Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.

Research Lab: https://thevamaran.engr.wisc.edu

Dear Colleagues,

I invite you to read our recent paper on the orientation dependent plasticity mechanisms that control the dynamic creation of nanostructures and their  behavior under subsequent quasistatic microcompression published in the International Journal of Plasticity: https://doi.org/10.1016/j.ijplas.2023.103657

Abstract

Dear Colleagues,

I invite you to read our recent paper on the process-structure-property relations in heterogeneous nanostructured metals created through a laser induced projectile impact of single crystal microcubes published in the Extreme Mechanics Letters: https://doi.org/10.1016/j.eml.2023.102037

Abstract

Dear Colleagues,

I invite you to read our latest paper published in ACS Nano: https://pubs.acs.org/doi/10.1021/acsnano.3c01223

Dear Colleagues,

I invite you to read our recent publication on Acta Materialia on the dynamic hardness evolution in metals.

Abstract

Dear Colleagues, 

I invite you to read our recent Extreme Mechanics Letters paper presenting a novel viewpoint on enhancing emissivity near exceptional point singularities in a non-Hermitian metamaterial. We present the experiments and numerical modeling in an elastodynamic framework--where the actuation forces from an actuator are enhanced by coupling to a passive dissipative non-Hermitian metamaterial--and present the theory further generalized and applicable to other physical frameworks from acoustics to optics and microwaves.

Abstract

Dear Colleagues,

I invite you to read our recent paper on hierarchically architected foams published in Extreme Mechanics Letters: Read full article here.

Abstract

Dear Colleagues, Our recent publication on the Journal of Applied Mechanics:

Exceptional points (EP) are non-Hermitian degeneracies where eigenvalues and their corresponding eigenvectors coalesce. Recently, EPs have attracted attention as a means to enhance the responsivity of sensors, through the abrupt resonant detuning occurring in their proximity. In many cases, however, the EP implementation is accompanied by noise enhancement, leading to the degradation of the sensor’s performance.

We study the nature of an environment-induced exceptional point in a non-Hermitian pair of coupled mechanical oscillators. The mechanical oscillators are a pair of pillars carved out of a single isotropic elastodynamic medium made of aluminum and consist of carefully controlled differential losses. The interoscillator coupling originates exclusively from background modes associated with the “environment,” that portion of the structure which, if perfectly rigid, would support the oscillators without coupling.