Mechanical Engineering MS Thesis Defense by Mr. Nasim Anjum DATE: July 7, 2020 TIME: 10:00 a.m. - 12:00 p.m. LOCATION: Zoom Conference Link: //umassd.zoom.us/j/91082321887 TOPIC: Composite-based Flexible Supercapacitors for Wearable Applications ABSTRACT: Flexible and wearable electronics are becoming increasingly popular nowadays. Flexible energy storage devices like flexible supercapacitors can serve as the power source for next-generation wearables to offer flexibility and safety that current batteries lack. The thesis aims to develop safe, mechanically durable, and flexible supercapacitors using hydrogel polymer electrolytes and carbon-based flexible electrodes. The first part of the thesis studies the processing and performance improvement of the hydrogel polymer electrolytes. We found that both ionic conductivity and interfacial capacitance of such electrolytes can be modulated by exposing them to different humidity. Orders of magnitude increase in ionic conductivity was observed when samples were treated at high humidity. We applied high-humidity treatment to flexible supercapacitor prototypes and achieved significant increases in both energy density and power density. The second part of the thesis presents the design and testing of a highly durable supercapacitor. We modeled the flexible supercapacitors as laminate composites, in which the polymer electrolytes are matrix and electrode materials are fillers. We adjusted structures and compositions of fillers to simultaneously optimize the flexibility, strength, and energy storage capacity of the device. The prototype supercapacitor showed an aerial capacitance of over 40 mF/cm2 with thickness and flexibility comparable to wearable fabrics. Moreover, the device is foldable, machine-washable, and durable under repeated bending and pressing. ADVISOR: Dr. Caiwei Shen, Assistant Professor of Mechanical Engineering, UMassD COMMITTEE MEMBERS: Dr. Vijaya Chalivendra, Professor in Mechanical Engineering and Graduate Program Director, UMassD Dr. Jun Li, Assistant Professor of Mechanical Engineering, UMassD Open to the public. All MNE students are encouraged to attend. For more information, please contact Dr. Caiwei Shen (firstname.lastname@example.org, 508-999-8449).
Engineering and Applied Science PhD Thesis Defense by Ms. Rojin Ghandriz DATE: July 20, 2020 TIME: 10:00 a.m. â€“ 12:00 p.m. LOCATION: Zoom Conference Link: //umassd.zoom.us/j/97442528605 TOPIC: Computational Modeling of Anisotropic Fracture in 3D Printed Polymers and Patterned Structures ABSTRACT: 3D printing, or additive manufacturing (AM), has been transiting from demonstrative prototypes to functional products that are impacting a wide variety of sectors, from biomedical, electronic, and automotive to aerospace industries. However, the reduced fracture performance often observed in 3D printed parts limits their applications to end-use load-bearing components. The layered additive deposition process in 3D printing leads to anisotropic fracture behaviors and complicated crack propagation patterns, which brings challenges in computational modeling and analysis. In this study, both extended finite element method (XFEM) and phase field fracture method (PFFM) are developed to model anisotropic fractures in 3D printed polymers as well as patterned structures for enhanced fracture resistance.
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.ADVISOR: Prof. Jun Li, Assistant Professor of Mechanical Engineering, UMassD COMMITTEE MEMBERS: Â· Prof. Wenzhen Huang, Professor, Chair of Department of Mechanical Engineering, UMassD Â· Prof. Caiwei Shen, Assistant Professor of Mechanical Engineering, UMassD
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.Open to the public. All EAS students are encouraged to attend. For more information, please contact Dr. Jun Li (email@example.com, 508-999-8692 ). Thank you, Sue Cunha, Administrative Assistant
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