GPU-Based Simulations of Fracture in Idealized Brick and Mortar Microstructures
Event details
| Date | 30.09.2014 |
| Hour | 13:15 › 14:15 |
| Speaker |
Prof. Matthew Begley, Materials and Mechanical Engineering at the University of California, Santa Barbara, USA Bio : Matthew R. Begley is a Professor of Materials and Mechanical Engineering at the University of California, Santa Barbara. Prof. Begley joined UCSB in 2010, following faculty positions at the University of Connecticut (1997-2001) and the University of Virginia (2001-2009). He received his Ph.D. in mechanical engineering from UCSB in 1995, where developed failure prediction codes for fibrous composites, with an emphasis on high temperature applications. From 1995-1997, Prof. Begley was a post-doctoral fellow at Harvard University: during this time, he worked on the thermomechanical performance of multilayered systems, with an emphasis on material behavior at small scales and the reliability of multifunctional coatings. Professor Begley's current research interests are focused on the mechanics of multilayers, 3D printing of multi-phase materials, and bio-insipred cellular materials. |
| Location | |
| Category | Conferences - Seminars |
This talk will describe simulations of fracture in idealized brick and mortar microstructures, consisting of very stiff bricks bonded together with compliant, ductile mortar. The objective of the work is to guide the development of ‘synthetic nacres’, by quantifying connections between the composite’s macroscopic behavior, the brick geometry and stacking hierarchy, and interface behaviors. The simulations are generated using an efficient computational framework that tracks individual brick displacements and rotations and describes brick interactions using a non-linear cohesive law. The framework is specifically tailored to using graphical processing units (GPUs) to exploit highly parallel computations. A novel incremental Monte-Carlo minimization scheme is used to simulate cracking without a priori assumptions of the interaction between crack path and brick arrangement. Simulations with various brick/interface alignments, size distributions, strength distributions, etc. are used to quantify their impact on macroscopic initiation toughness, strength and modulus. The results demonstrate that the fracture toughness and strength are a strong functions of the orientation between microstructural features and loading direction, which controls fracture mechanisms observed elsewhere (e.g. splitting, staircases, bridging). Further, stochastic distributions in constituent properties can have a profound impact on inferred composite (macroscopic) properties, even though the latter are essentially deterministic. Finally, the talk will conclude with a brief discussion of the synthesis such microstructures and present novel results for assembling ordered arrays of microscale bricks using acoustic focusing.
Practical information
- General public
- Free
Organizer
- IGM-GE
Contact
- Géraldine Palaj