Lorenzo Valdevit
Professor, Materials Science and Engineering and Director, Institute for Design and Manufacturing Innovation UC Irvine
- Irvine CA
Lorenzo Valdevit’s research is in the general area of mechanics of materials and structures and additive manufacturing
Media
Social
Biography
Prof. Valdevit works in the general area of mechanics of materials, developing analytical, numerical and experimental techniques across multiple length scales. His primary research goal is the optimal design, modeling, fabrication and experimental characterization of metamaterials and structures with unprecedented combinations of properties. Some key research accomplishments have been the development and optimization of multifunctional sandwich panels for thermo-structural applications (including hypersonics), the mechanical characterization, numerical modeling and optimal design of ultralight hollow micro-lattices and 2D and 3D shape-reconfigurable materials, the development of novel topology optimization algorithms for the optimal design of architected materials with complex unit cell designs, and the advancement of novel additive manufacturing processes (in particular two-photon polymerization Direct Laser Writing, Direct Metal Laser Sintering and Cold Spray).
Areas of Expertise
Accomplishments
Orange County Engineering Council Outstanding Engineering Educator Award
2012
Popular Mechanics Breakthrough Award
2012
UCI School of Engineering Outstanding Faculty Service Award
2019
Education
Princeton University
PhD
Mechanical and Aerospace Engineering
2005
Princeton University
MA
Mechanical and Aerospace Engineering
2002
University of Trieste, Italy
MS
Materials Engineering
2000
Links
Media Appearances
New Crush-Resistant Metamaterials can Prevent Failure of Structures
AZO Materials online
2021-03-12
According to Valdevit, who is also a professor of mechanical and aerospace engineering at the University of California, Irvine, tensegrity metamaterials have an unparalleled combination of strength, deformability, extreme energy absorption and failure resistance, superseding all other kinds of advanced lightweight architectures.
Crushing It
The UCSB Current online
2020-04-28
The scientists from the architected materials laboratory of UC Irvine professor Lorenzo Valdevit first fabricated a nanoscale closed-cell carbon plate architecture in the cubic+octet design. Fabrication in the nanoscale (the plates were about 160 nanometers or 1/400th the thickness of a human hair) was the method of choice because it avoids the kind of mechanical defects that come with material in larger scales, allowing the researchers to create perfect crystals.
New carbon nanostructure is stronger than diamonds
Design Products & Applications online
2020-04-20
Members of the architected materials laboratory of Lorenzo Valdevit, UCI Professor of Materials Science & Engineering as well as Mechanical & Aerospace Engineering, verified their findings using a scanning electron microscope and other technologies provided by the Irvine Materials Research Institute.
Carbon Nanostructure Stronger Than Diamonds
3D Printing Progress online
2020-04-16
According to the paper, the team's design has been shown to improve on the average performance of cylindrical beam-based architectures by up to 639 percent in strength and 522 percent in rigidity. Members of the architected materials laboratory of Lorenzo Valdevit, UCI professor of materials science & engineering as well as mechanical & aerospace engineering, verified their findings using a scanning electron microscope and other technologies provided by the Irvine Materials Research Institute.
“Stronger Than Diamonds” Carbon Nanostructure Designed – Reaches Theoretical Limit of Performance
SciTechDaily online
2020-04-14
Members of the architected materials laboratory of Lorenzo Valdevit, UCI professor of materials science & engineering as well as mechanical & aerospace engineering, verified their findings using a scanning electron microscope and other technologies provided by the Irvine Materials Research Institute.
Patents
Self calibrating micro-fabricated load cells
US9228916B2
Self calibrating micro-fabricated load cells are disclosed. According to one embodiment, a self calibrating load cell comprises a resonant double ended tuning fork force sensor and a phase locked loop circuit for detection of frequency changes upon external load application to the resonant double ended tuning fork force sensor.
Elliptic c4 with optimal orientation for enhanced reliability in electronic packages
US20110049711A1
An arrangement for the equipping of electronic packages with elliptical C4 connects possessing optimal orientation for enhanced reliability. Furthermore, disclosed is a method providing elliptical C4 connects which possesses optimal orientation for enhanced reliability, as implemented in connection with their installation in electronic packages.
Electronic components on trenched substrates and method of forming same
US8659119B2
An electronic module including a substrate having at least one structure that reduces stress flow through the substrate, wherein the structure comprises at least one trench in a surface of the substrate.
Articles
Nanolattices: An Emerging Class of Mechanical Metamaterials
Advanced Materials2017
In 1903, Alexander Graham Bell developed a design principle to generate lightweight, mechanically robust lattice structures based on triangular cells; this has since found broad application in lightweight design. Over one hundred years later, the same principle is being used in the fabrication of nanolattice materials, namely lattice structures composed of nanoscale constituents.
Magnetoelastic Metamaterials for Energy Dissipation and Wave Filtering
Advanced Engineering MaterialsAnna Guell Izard, Lorenzo Valdevit
2019
A novel magnetoelastic mechanical metamaterial consisting of a hyperelastic 2D lattice incorporating permanent magnets is presented and characterized. When properly designed and fabricated, the metamaterial possesses two stable equilibrium configurations (henceforth referred to as hexagonal/hourglass and kagome ), both stretching dominated (and hence stiff). The two configurations have significantly different elastic properties and wave propagation characteristics, as shown numerically and experimentally.
A versatile numerical approach for calculating the fracture toughness and R-curves of cellular materials
Journal of the Mechanics and Physics of SolidsMeng-Ting Hsieh, Vikram S Deshpande, Lorenzo Valdevit
2020
We develop a numerical methodology for the calculation of mode-I R-curves of brittle and elastoplastic lattice materials, and unveil the impact of lattice topology, relative density and constituent material behavior on the toughening response of 2D isotropic lattices. The approach is based on finite element calculations of the J-integral on a single-edge-notch-bend (SENB) specimen, with individual bars modeled as beams having a linear elastic or a power-law elasto-plastic constitutive behavior and a maximum strain-based damage model.
Plate-nanolattices at the theoretical limit of stiffness and strength
Nature CommunicationsCameron Crook, Jens Bauer, Anna Guell Izard, Cristine Santos de Oliveira, Juliana Martins de Souza e Silva, Jonathan B. Berger & Lorenzo Valdevit
2020
Though beam-based lattices have dominated mechanical metamaterials for the past two decades, low structural efficiency limits their performance to fractions of the Hashin-Shtrikman and Suquet upper bounds, i.e. the theoretical stiffness and strength limits of any isotropic cellular topology, respectively. While plate-based designs are predicted to reach the upper bounds, experimental verification has remained elusive due to significant manufacturing challenges.
Enhanced adhesion in two-photon polymerization direct laser writing
AIP AdvancesAG Izard, EP Garcia, M Dixon, EO Potma, T Baldacchini, L Valdevit
2020
We have quantified the adhesion forces between two-photon polymerization direct laser writing (TPP-DLW) microstructures and glass surfaces with and without an adhesion promoter. Glass surfaces treated with an acryloxy-silane agent produce adhesion forces that are almost three times larger than the forces observed with pristine glass surfaces. Determination of the substrates’ surface free energies suggests that the observed adhesion enhancement is chemical in its nature, implying that covalent bonds are formed between the polymer and the glass by means of the silane agent. The importance of this finding is demonstrated in the successful production of glassy carbon microstructures using TPP-DLW, followed by pyrolysis.
