research

The thermal-hydraulics as well as flow-induced vibration of wire-wrapped rod bundles calls for accurate and efficient liquid metal flow simulation and prediction, yet it remains a challenge due to the complex geometries and high Reynolds number flow in wire-wrapped rod channel. Previous efforts towards this goal exclusively adopts full-order modeling (FOM), which is prohibitively computation-intensive.

We present a general formalism for the analysis of mechanical lattices with microstructure using the concept of effective dynamic mass. We first revisit a classical case of microstructure being modeled by a  spring-interconnected mass-in-mass cell. The frequency-dependent effective dynamic mass of the cell is the sum of a static mass and of an added mass, in analogy to that of a swimmer in a fluid. The effective dynamic mass is derived using three different methods: momentum equivalence, dynamic condensation, and action equivalence.

MedTrain+ is the successor Industry-Academia Training, Career Development and Mobility Fellowship Programme at CÚRAM, SFI Research Centre for Medical Devices to MedTrain (GA 713690). As part of this, MedTrain+ is offering prestigious three-year fellowships to eligible experienced researchers in the broad area of Medical Device Research and Development. The MedTrain+ programme will provide excellent experienced researchers with a research, complementary, and transferable skills training experience of the highest international standards.

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

Excellent paper looking at temperature profiles during LPBF AM (using miniSLM):

https://www.sciencedirect.com/science/article/pii/S2772369023000312

Of course, questions remain regarding the validity of temperature estimation method, max temp, max cooling rates etc. - 
but it is an important step in the right direction!

Hello All,

Gianmarco Manzini (LANL) and I are teaching a short course entitled: "Virtual Element Method in Solid and Fluid Mechanics" at USNCCM17 in Albuquerque, which will be held on Sunday, July 23rd, 2023.  If you plan to be at the conference in-person, then do consider attending the short course.  A summary of the course follows:

Jiang Ke. Plastic Limit Analysis of Plane Stress Problems by Truss Element. Preprint at https://doi.org/10.2139/ssrn.4476517 , 2023.

The Most Beautiful Animation of Plasticity in History

(1) https://www.bilibili.com/video/BV1ns4y1F7t1/?spm_id_from=333.999.0.0

By: Ramathasan Thevamaran (Theva)

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

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

Soft biological tissues often exhibit notable strain stiffening under increasing stretch, and this can have significant effects on tissue growth and morphological development, such as causing symmetry breaking in growing airways and leading to mucosal folding and airway hyperresponsiveness. To investigate the role of strain stiffening and the multifactorial control in growth and remodeling, we consider a growing tubular structure with strain-stiffening effects caused by increased and tightened collagen.

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

Prof. Zdenek Bazant (Northwestern University, USA) sent me a copy of the plenary lecture he delivered at Int. Conf. on Damage Mechanics 4 at LSU on May 15, 2023, to be posted. The lecture is about a critique of the theoretical inconsistencies in the Phase Field and Peridynamics techniques. Remarkably interesting talk that will create a significant discussion about the validity of these methods..

The Zdeněk P. Bažant Medal was established in 2022 by the Applied Mechanics Division and recognizes an individual who has made significant contributions to the field of mechanics through research, practice, teaching and/or outstanding leadership. For details, please go to: Zdeněk P. Bažant Medal

For a given class of materials, universal displacements are those displacements that can be maintained for any member of the class by applying only boundary tractions. In this paper we study universal displacements in compressible anisotropic linear elastic solids reinforced by a family of inextensible fibers. For each symmetry class and for a uniform distribution of straight fibers respecting the corresponding symmetry we characterize the respective universal displacements. A goal of this paper is to investigate how an internal constraint affects the set of universal displacements.

This work deals with the hydrodynamic interaction of two parallel circular cylinders, with identical radii, immersed in a viscous fluid initially at rest. One cylinder is stationary while the other one is imposed a harmonic motion with a moderate amplitude of vibration. The direction of motion is parallel to the line joining the centers of the two cylinders. The two dimensional fluid–structure problem is numerically solved by the Arbitrary Lagrangian–Eulerian method implemented in the open-source CFD code TrioCFD.

Dear Colleagues,

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

"Order Parameter Engineering for Random Systems" published in High Entropy Alloys and Materials

Abstract:

Two postdoctoral researcher positions and one Ph.D. position are available in the Multiphase Fluid-Structure Interaction Lab in Tsinghua Shenzhen International Graduate School. The postdoc will assist the PI (Prof. Shunxiang Cao) in tasks associated with the high-performance simulations of multiphase fluid-structure interaction (FSI) problems, including bubbly flow modeling, development of efficient fluid-structure coupling algorithms, development of high-performance fluid-structure coupled solver, and reinforcement-learning-based control of FSI. 

In our recent study published in ACS Applied Materials & Interfaces, using a multiscale modeling technique, we investigated how the combination of nanofibrillation and interfacial tuning can have a synergistic effect on the stiffness-toughness balance in rubber-toughened nanocomposites. Check out the link below:

https://pubs.acs.org/doi/full/10.1021/acsami.3c04017