Congratulations Rojin on receiving the Distinguished Doctoral Fellowship! Rojin has been working on modeling fracture behaviors of 3D printed materials as well as other layered structures. Well done!
Congratulations Rojin and Prosenjit on winning the Dr. David M. Aber Scholarship for DS COE Conference!
Congratulations Rojin and Prosenjit on winning the Dr. David M. Aber Scholarship for DS COExperience Conference! COExperience is a three day event bringing together expert users of Dassault Systèmes solutions. Rojin will present “Predicting Fracture of Layered 3D Printed Materials” and Prosenjit will present “Prediction of Orthotropic Material Properties from RVE of 3D Printed Materials”. Good job!
J. Li*, S. Yang, D. Li, and V. Chalivendra
A combination of computational and experimental investigation is performed to study additively manufactured (AM) polymers for enhanced fracture properties. Single edge notch tension specimens made of acrylonitrile-butadienestyrene (ABS) materials through fused deposition modeling with various build/raster orientations are studied, namely, horizontal builds with 45°/−45° (45–45) or 0°/90° (0–90) raster orientations, and vertical builds with layers perpendicular to the notch (V0). The measured fracture properties were found to highly depend on the build/raster orientations and crack kinking was observed in 45–45 samples to follow the weak inter-filament weld-lines. The extended finite element method (XFEM) using cohesive segment approach with anisotropic damage initiation and evolution criteria was developed to capture the dependency of fracture behaviors on build/raster orientations. Numerical parametric studies further show that the inter-filament bonding strength could be tuned to create alternate crack paths for maximum energy dissipated in AM polymer fracture. Finally, toughening mechanisms using topological patterns on the sample surface to deflect crack paths are demonstrated in experiments. This study sheds light on optimization of AM polymers for enhanced fracture properties.
Dr. Li is invited to give a talk at the University of Vermont Civil Engineering Seminar titled “Enhancing Fracture Performance of 3D Printed Layered Materials” on Oct 26, 2018.
The CMML welcomes new members Megan Scribner, Garret Sampel, and Jie Hou! Megan and Garret are undergraduate students at UMass Dartmouth. Jie is from Nanjing University of Aeronautics and Astronautics and will do his M.S. research at CMML. Wish them enjoy their time at CMML!
Congratulations CMML members Prosenjit, Rojin, and Asia for receiving the 2nd place prize in the Dassault Systemes (DS) Additive Manufacturing Hackathon event. In this event, participants work in team to overcome design and manufacturing challenges in additive manufacturing from industrial problems. We are grateful to DS Simulia group for providing this invaluable opportunity of hands-on learning and application of 3DEXPERIENCE additive manufacturing tools to solve challenge problems in industry.
Congratulations Rojin on winning the 2nd place award in the 24th Annual Sigma Xi Research Exhibit at UMass Dartmouth! Rojin presented a poster ‘Extended Finite Element Method (XFEM) to study the fracture of 3D printed polymers considering layer interfaces’. Well done!
The CMML welcomes new member Rojin Ghandriz from Sharif University of Technology. Rojin joins as a PhD student in Engineering and Applied Science. Let’s wish her enjoy good time at CMML!
Dr. Li gives a talk at the University of Rhode Island Mechanical Engineering Seminar titled “Multiscale Materials Modeling and Application in Aerospace, Biomedical Engineering and 3D Printing” on Oct 6, 2017.
The CMML welcomes new members Asia Haque and Prosenjit Biswas! Asia is from University of Dhaka and Prosenjit comes from Khulna University of Engineering and Technology. They both joined CMML as graduate students. Welcome on board!