Covalent adaptable network (CAN) polymers can rearrange their macromolecular network by bond exchange reactions (BERs), where an active unit attaches to and then replaces a unit in an existing bond and forms a new bond. When such macromolecular events occur on the interface, they can contribute to surface welding, self-healing, and recycling of thermosetting polymers. In this paper, we study the interfacial welding and failure of CANs involving both interfacial normal and shear stresses. To do this, we incorporate our recently developed multiscale model for surface welding of CANs with a cohesive zone modeling approach in finite-element method (FEM) simulation. The developed FEM paradigm involves a multiscale model predicting the interfacial chain density and fracture energy, which are transferred to a cohesive zone model to establish the surface traction-separation law. The simulations show good agreement with experimental results on the modulus and strength of welded samples. They also provide understanding of the interactions between surface welding and material malleability in determining the final mechanical properties of polymer structures. The developed FEM model can be applied to study other complex welding problems, such as polymer reprocessing with nonregular particle size and shape.
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September 2016
Research-Article
A Computational Model for Surface Welding in Covalent Adaptable Networks Using Finite-Element Analysis
Kai Yu,
Kai Yu
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
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Qian Shi,
Qian Shi
State Key Laboratory for Strength and
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
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Tiejun Wang,
Tiejun Wang
State Key Laboratory for Strength and
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Search for other works by this author on:
Martin L. Dunn,
Martin L. Dunn
SUTD Digital Manufacturing
and Design (DManD) Centre,
Singapore University of Technology
and Design,
Singapore 138682, Singapore
and Design (DManD) Centre,
Singapore University of Technology
and Design,
Singapore 138682, Singapore
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H. Jerry Qi
H. Jerry Qi
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: qih@me.gatech.edu
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: qih@me.gatech.edu
Search for other works by this author on:
Kai Yu
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
Qian Shi
State Key Laboratory for Strength and
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Tiejun Wang
State Key Laboratory for Strength and
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Vibration of Mechanical Structures,
School of Aerospace Science,
Xian Jiaotong University,
Xian 710049, China
Martin L. Dunn
SUTD Digital Manufacturing
and Design (DManD) Centre,
Singapore University of Technology
and Design,
Singapore 138682, Singapore
and Design (DManD) Centre,
Singapore University of Technology
and Design,
Singapore 138682, Singapore
H. Jerry Qi
The George W. Woodruff School
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: qih@me.gatech.edu
of Mechanical Engineering,
Georgia Institute of Technology,
Atlanta, GA 30332
e-mail: qih@me.gatech.edu
1Corresponding author.
Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received March 31, 2016; final manuscript received May 17, 2016; published online June 22, 2016. Editor: Yonggang Huang.
J. Appl. Mech. Sep 2016, 83(9): 091002 (11 pages)
Published Online: June 22, 2016
Article history
Received:
March 31, 2016
Revised:
May 17, 2016
Citation
Yu, K., Shi, Q., Wang, T., Dunn, M. L., and Jerry Qi, H. (June 22, 2016). "A Computational Model for Surface Welding in Covalent Adaptable Networks Using Finite-Element Analysis." ASME. J. Appl. Mech. September 2016; 83(9): 091002. https://doi.org/10.1115/1.4033682
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