architected materials

Hanxun Jin (a,b), Horacio D. Espinosa (b)
a Division of Engineering and Applied Science, California Institute of Technology
b Department of Mechanical Engineering, Northwestern University

In recent years, Machine Learning (ML) has become increasingly prominent in Solid Mechanics. Its diverse applications include extracting unknown material parameters, developing surrogate models for constitutive modeling, advancing multiscale modeling, and designing architected materials. In this Journal Club, we will focus our discussion on the recent advances and challenges of ML when experimental data is involved. With broad community interest, as reflected by the increasing number of publications in this field, we have recently published a review article in Applied Mechanics Reviews titled “Recent Advances and Applications of Machine Learning in Experimental Solid Mechanics: A Review”. Moreover, a recent insightful paper from Prof. Sam Daly’s group also discussed some perspectives in this field. In this Journal Club, we would like to introduce and share insights into this exciting field.

1 Ph.D. position (36 months) within the research activity related to the PI ERC Consolidator Grant "SFOAM" will be funded by and available at the University of Trento (Italy). 

A Postdoctoral Research Fellow position is available immediately in the Advanced Digital & Additive Manufacturing (ADAM) Center at the Khalifa University of Science and Technology in Abu Dhabi in United Arab Emirates. Applicants should demonstrate research capabilities in investigating the acoustic absorption, vibration damping, and mechanical behavior of structural systems made of architected lightweight cellular materials and composites.

We are pleased to invite you to the workshop “State of the art and challenges in the modelling and design of ultralightweight structures”, which will be held remotely on the 12th of May, starting at 8.45 am BST (UK time). Twelve international academic and industrial speakers will share their research on the characterization, modelling and design of ultralightweight materials and structures.

The link to the Zoom event is: https://ucl.zoom.us/j/97659415998

A postdoctoral fellow research position is availabe immediately in the Advanced Digital & Additive Manufacturing (ADAM) center at Khalifa University in Abu Dhabi in United Arab Emirates. Applicants should demonstrate research capabilities in computational modeling and experimentation in the area of additive manufacturing (3D printing).

A PhD student is being sought to fill an opening in the Gross Materials Lab (group website: andrewjgross.com) at the University of South Carolina. Research activities are focused on the design, fabrication, and characterization of architected materials. Students must be capable coders to be considered. Prior experience configuring optical equipment and National Instruments DAQ hardware is valuable, but not required. Students interested in or having prior experience with finite element modeling, mechanical property testing, and 3D printing are strongly encouraged to apply.

The James Watt School of Engineering of the University of Glasgow is seeking a highly motivated graduate to undertake an exciting 3.5-year PhD project entitled, ‘multifunctional cellular composites enabled by 3D printing’. The objective of the project is to design additive manufacturing-enabled microarchitected composites with unprecedented properties optimized for location-specific structural and functional requirements for a multitude of applications. Experience and/or a strong interest in one or more of the following areas are

Two PhD students are being sought to fill openings in the Gross Materials Lab (group website: andrewjgross.com) at the University of South Carolina. Research activities are focused on the design, fabrication, and characterization of architected materials. Students must be capable coders to be considered. Students interested in or having prior experience with finite element modeling, mechanical property testing, and 3D printing are strongly encouraged to apply.

We recently presented an original research that uses 3d printing to realise the mimicry of the microstructure observed in crystalline metals to employ crystals’ hardening mechanisms to develop robust and damage-tolerant architected materials (Nature 2019; 565:305 - https://www.nature.com/articles/s41586-018-0850-3).

Abstract

Dear Mechanicians,

You are cordially invited to submit your abstract (text 400 words) to our Symposium on Recent Advances in Mechanical Metamaterials (symposium 352) as part of the 18th U.S. National Congress for Theoretical and Applied Mechanics that will be hosted by Northwestern University at the Hyatt Regency O’Hare from June 5 to June 9, 2018.

Abstract submission is open until November 10, 2017

One postdoctoral fellow position is available in the area of architected materials. Interested individuals should have a Ph.D. in related disciplines.  We are looking for a person with strong motivation, publication record, analytical and interpersonal skills and integrity with expertise in the area of mechanics of materials and structures, metamaterials, and finite element methods. A person with previous experiences in simulations and experiments on dynamic behaviors of soft materials and wave propagation in soft cellular structures is preferred.

Architected Materials

Introduction  

A. Rafsanjani and D. Pasini, Bistable Auxetic Mechanical Metamaterials Inspired by Ancient Geometric Motifs. Extreme Mechanics Letters 9, 291-296 (2016).

Most of the auxetic materials that have been characterized experimentally or studied analytically are anisotropic and this limits their possible applications, as they need to be carefully oriented during operation. Here, through a combined numerical and experimental approach, we demonstrate that 2D auxetic materials with isotropic response can be easily realized by perforating a sheet with elongated cuts arranged to form a periodic pattern with either six-fold or three-fold symmetry.

3D printing and numerical analysis are combined to design a new class of architected materials that contain bistable beam elements and exhibit controlled trapping of elastic energy. The proposed energy-absorbing structures are reusable. Moreover, the mechanism of energy absorption stems solely from the structural geometry of the printed beam elements, and is therefore both materials- and loading-rate independent.