December 30, our paper entitled "Sacrificial Cyclic Poly(phthalaldehyde) Templates for Low-Temperature Vascularization
of Polymer Matrices" is published on ACS Applied Polymer Materials! Congradulations!
November 10, we are awarded our first NSF proposal. The proposal title is "An Integrated
Multiscale Reduced-Order Modeling and Experimental Framework for Lithium-ion Batteries
under Mechanical Abuse Conditions". This project is in collaboration with Dr. Chen's group from University of Lousville! Congradulations!
September 11, our paper entitled "Large-deformation reduced order homogenization of polycrystalline materials" is published on Computer Methods in Applied Mechanics and Engineering! Congradulations!
August 30, our paper entitled "Multiscale reduced-order modeling of a titanium skin panel subjected to thermo-mechanical
loading" is published on AIAA Journal! Congradulations!
August 16, our paper entitled "Nonlinear guided wave tomography for detection and evaluation of early-life material
degradation in plates" is published on Sensors! Congradulations！
July 27, Xiang Zhang presented at the virtually in the 16th USNCCM conference. The
title of his presentation is: Nonlinear Microstructure Material Design with Reduced-Order
Modeling". A copy of the abstract is attached below.
Recent progress in multiscale modeling and sensitivity analysis, together with advancement
in additive manufacturing, allow us to develop an integrated workflow to design and
manufacture the microstructure geometrical features and constituent properties to
deliver a desired stress-strain response. During this process, the prohibitive computational
cost associated with multiple optimization iteration and costly evaluation of a single
microstructure problem still limits the application of this workflow, especially for
the cases that involve complex microstructure and different deformation modes. Here
we present a multiscale reduced-order optimization method for efficient nonlinear
microstructure material design. This method builds on the recent development on Interface-enriched
Generalized Finite Element Method (IGFEM) based reduced-order model, to formulate
a reduced order representation of the microstructure problem. Model order reduction
is achieved by partitioning the microstructure volume and interface into a number
of subdomains called parts, where a series of influence function problems based on
the elastic properties of the microstrucrue are solved a priori to obtain the interaction
coefficients between different parts and between each part ant the microstructure.
Based on these interaction coefficients, and the assumption that the response in each
part is uniform, a system of linear algebra equations is derived to replace the microstructure
problem with part-wise response as unknows. In addition, the material sensitivities
are further derived withing the reduced order system of equation. The reduced-order
microstructure problem evaluation, and reduce-order sensitivity analysis allow us
to very efficiently optimize the microstructure material properties with multiple
initial states, from which we choose the best optimization results and further conduct
a full IGFEM-based optimization to obtain the final optimization result. This two-step
optimization process is demonstrated to deliver satisfactory results on 3D particulate
composites with the presence of both volumetric and interfacial damage compare with
pure IGFEM-based optimization.
May 26, Xiang Zhang presented at the virtually in the EMI 2021/PMC 2021 conference.
The title of his presentation is: Multiscale Reduced-Order Modeling of a Titanium
Skin Panel Subjected to Thermo-Mechanical Loading". A copy of the abstract is attached
We propose a reduced order multiscale computational approach to predict the response
of a polycrystalline structure subjected to thermo-mechanical loading, in which the
material microstructure (i.e., at the scale of the representative volume) and all
relevant microstructural response mechanisms are directly embedded and fully coupled
with a structural analysis. The proposed approach is based on the eigenstrain-based
reduced order model previously developed the authors. EHM operates in a computational
homogenization settings, which takes the concept of transformation field theory that
pre-computes certain microscale information (e.g. localization tensors, concentration
tensors) by evaluating linear elastic microscale problems and considers piece-wise
constant inelastic response within partitions (e.g., grains) of the microstructure.
By this approach, a significant reduction in computational cost is achieved, compared
with classical computational homogenization approaches that employ crystal plasticity
finite element (CPFE) simulation to describe the microscale response. While previous
development considers only mechanical loading, the proposed approach further accounts
for the thermal strain at the microscale, as well as temperature dependent material
properties and evolution laws. To account for the thermal effects, a set of temperature
influence functions, similar to the elastic and inelastic function problems are formulated,
and the part-wise thermal strain is accounted for in the reduced order system. The
proposed approach was calibrated and validated by a series of uniaxial tensile tests
of Ti-6242S at a wide range of temperatures and strain rates. The validated model
is then adopted to study the response of a generic aircraft skin panel subjected to
thermo-mechanical loading associated with supersonic flight, which demonstrates the
capability of the developed model for structural scale simulation that involves thermo-mechanical
loading, and provides insights on understanding the plastic deformation as well as
fatigue initiation of the panel structure.
May 14, our paper entitled "Rapid synchronized fabrication of vascularized thermosets and composites" is published on Nature Communications! Congradulations！
Feburary 4, our paper entitled "A GFEM-based reduced-order homogenization model for heterogeneous materials under
volumetric and interfacial damage" is published on Computer Methods in Applied Mechanics and Engineering! Congradulations！
November 16, Xiang Zhang presented at ASME IMECE 2020 virtually. The title of Xiang’s
presentation was: “Integrating GFEM and Eigendeforamtion-based Reduced-Order Homogenization
Model for Simulating Heterogeneous Materials Under Volumetric and Interfacial Damage”.
June 11, our paper entitled "Frontal vs. bulk polymerization of fiber-reinforced polymer-matrix composites" is accepted by Composites Science and Technology! Congradulations！
March 11, our book chapter entitled "Transverse Failure of Unidirectional Composites: Sensitivity to Interfacial Properties" is published in Integrated Computational Materials Engineering (ICME)! Congradulations！
January 27, Pengfei Shen joins CAMML as a Ph.D. student. He will be studying fatigue
in additivelly manufactured Titanium alloys. Welcome Penfei！
December 11, our paper entitled "Dislocation density informed eigenstrain based reduced order homogenization modeling:
verification and application on a titanium alloy structure subjected to cyclic loading" is accepted by Modelling and Simulation in Materials Science and Engineering! Congradulations！
September 19, our paper entitled "Manufacturing of unidirectional glass-fiber-reinforced composites via frontal polymerization:
A numerical study" is accepted by Composite Science and Technology! Congradulations！
August 27, Xiang Zhang officially started as a an assistant professor in the Mechanical
Engineering Department at the University of Wyoming! Welcome!
July 24, our paper entitled "Experimental and numerical study of mechanical properties of multi-phase medium-Mn
TWIP-TRIP steel: Influences of strain rate and phase constituents" is accepted by Acta Materialia! Congradulations!
May 15, our paper entitled "IGFEM-based shape sensitivity analysis of the transverse failure of a composite laminate" is accepted by Computationsl Mechanics. Congradulations!
April 29, Xiang Zhang accepted the offer as an assistant professor in the Mechanical
Engineering Department at the University of Wyoming! Congradulations!
Xiang Zhang, Ph.D.,
Assistant Professor of Mechanical Engineering Department
Room 335B, EERB1000 E. UniversityDept. 3295Laramie, WY 82071EmaiL: email@example.com Phone: 307-766-42381000 Fax: 307.766.2695