Joint Mechanical Engineering (MNE) and Engineering Applied Science (EAS) Seminar
When: Monday,
March 20, 2017
11:00 AM
-
12:00 PM
Where: Textiles Building 101E
Description: Joint Mechanical Engineering (MNE) & Engineering Applied Science (EAS) Seminar
March 20, 2017
11:00 a.m. 12:00 p.m.
Textile Building, Room 101E
SPEAKER:
Dr. Jun Li, Department of Mechanical Engineering, UMass Dartmouth
TOPIC:
Multiscale Materials Modeling and Application in Aerospace, Biomedical Engineering and 3D Printing
ABSTRACT:
Multiscale approaches of materials modeling are coming of age and represent a technology shift. The use of computation to understand and even design multiscale materials is becoming a trend. However, the predictive power of computational simulations is hindered by enormous information across multiple scales. In this talk, I will discuss examples from aerospace, biomedical engineering and 3D printing with the aim of developing effective multiscale approaches in application. First, I will present a top-down approach to model viscoelastic polymer thin film up to yielding for the NASA Superpressure Balloon. An anisotropic continuum membrane model was developed using a modified free volume theory based on the microscopic molecular mobility. This allows the macroscopic model calibrated to capture experimental results of both long-duration uniaxial tension and biaxial inflation over a wide temperature range for balloon design. Second, I will briefly discuss a bottom-up approach to model elastic modulus of trabecular bone. The model employs lamination theories, micromechanics and cellular solids at hierarchical levels spanning from the collagen-mineral nanoscale to the trabecular architecture level, using experimental inputs from SEM, Micro-CT, and optical microscopy at each level. Finally, I will present a workflow integrating topology optimization, multiscale modeling, and 3D printing for material-by-design.
BIO:
Dr. Jun Li joined the Department of Mechanical Engineering at the University of Massachusetts Dartmouth as an assistant professor in September 2016. He has industrial experience as a R&D quality assurance manager at Dassault Systemes Simulia Corp before joining UMass Dartmouth. Prior to that, he was a postdoctoral scholar at the Graduate Aerospace Laboratories in the California Institute of Technology. He obtained his Ph.D. in Mechanical Engineering from the University of Illinois at Urbana-Champaign, where he also earned M.S. degrees in Mathematics and in Theoretical and Applied Mechanics. He completed his B.S. in Mechanical Engineering with a minor in Mathematics from Shanghai Jiao Tong University. His research interest is to develop theoretical and computational methods combined with experiments for the assessment, design, optimization and manufacturing of novel materials and structures in various applications.
For more information please contact Dr. Mehdi Raessi, MNE Seminar Coordinator (mraessi@umassd.edu, 508-999-8496)
Light refreshments will be served.
All are welcome!
Students taking MNE-500 are REQUIRED to attend! All other MNE students are encouraged to attend.
Graduate (MS) and undergraduate (BS) students who are looking for a graduate thesis project or undergraduate research opportunities are encouraged to attend!
EAS students are encouraged to attend!
Thank you,
Sue Cunha, Administrative Assistant
scunha@umassd.edu
508-999-8492
March 20, 2017
11:00 a.m. 12:00 p.m.
Textile Building, Room 101E
SPEAKER:
Dr. Jun Li, Department of Mechanical Engineering, UMass Dartmouth
TOPIC:
Multiscale Materials Modeling and Application in Aerospace, Biomedical Engineering and 3D Printing
ABSTRACT:
Multiscale approaches of materials modeling are coming of age and represent a technology shift. The use of computation to understand and even design multiscale materials is becoming a trend. However, the predictive power of computational simulations is hindered by enormous information across multiple scales. In this talk, I will discuss examples from aerospace, biomedical engineering and 3D printing with the aim of developing effective multiscale approaches in application. First, I will present a top-down approach to model viscoelastic polymer thin film up to yielding for the NASA Superpressure Balloon. An anisotropic continuum membrane model was developed using a modified free volume theory based on the microscopic molecular mobility. This allows the macroscopic model calibrated to capture experimental results of both long-duration uniaxial tension and biaxial inflation over a wide temperature range for balloon design. Second, I will briefly discuss a bottom-up approach to model elastic modulus of trabecular bone. The model employs lamination theories, micromechanics and cellular solids at hierarchical levels spanning from the collagen-mineral nanoscale to the trabecular architecture level, using experimental inputs from SEM, Micro-CT, and optical microscopy at each level. Finally, I will present a workflow integrating topology optimization, multiscale modeling, and 3D printing for material-by-design.
BIO:
Dr. Jun Li joined the Department of Mechanical Engineering at the University of Massachusetts Dartmouth as an assistant professor in September 2016. He has industrial experience as a R&D quality assurance manager at Dassault Systemes Simulia Corp before joining UMass Dartmouth. Prior to that, he was a postdoctoral scholar at the Graduate Aerospace Laboratories in the California Institute of Technology. He obtained his Ph.D. in Mechanical Engineering from the University of Illinois at Urbana-Champaign, where he also earned M.S. degrees in Mathematics and in Theoretical and Applied Mechanics. He completed his B.S. in Mechanical Engineering with a minor in Mathematics from Shanghai Jiao Tong University. His research interest is to develop theoretical and computational methods combined with experiments for the assessment, design, optimization and manufacturing of novel materials and structures in various applications.
For more information please contact Dr. Mehdi Raessi, MNE Seminar Coordinator (mraessi@umassd.edu, 508-999-8496)
Light refreshments will be served.
All are welcome!
Students taking MNE-500 are REQUIRED to attend! All other MNE students are encouraged to attend.
Graduate (MS) and undergraduate (BS) students who are looking for a graduate thesis project or undergraduate research opportunities are encouraged to attend!
EAS students are encouraged to attend!
Thank you,
Sue Cunha, Administrative Assistant
scunha@umassd.edu
508-999-8492
Topical Areas: Faculty, General Public, Students, Students, Graduate, Students, Undergraduate, University Community, College of Engineering, Mechanical Engineering, Physics, Lectures and Seminars