38. recent advances in stabilized and nodally integrated meshfree modeling of extreme events

Department: Structural Engineering
Research Institute Affiliation: Agile Center for Extreme Events Research (CEER)
Faculty Advisor(s): Jiun-Shyan Chen

Primary Student
Name: Frank Nathan Beckwith
Email: fbeckwit@ucsd.edu
Phone: 208-559-7742
Grad Year: 2018

Student Collaborators
Marco Pasetto, mpasetto@eng.ucsd.edu | Mathew Reynolds, mpreynol@eng.ucsd.edu | Tsung-Hui Huang, tsunghuihuang@gmail.com

Abstract
Meshfree methods offer unique capabilities in modeling extreme events such as blast and impact on structures. Because the meshfree framework obviates the need for an element mesh, large deformation from such events is easily handled. However, overestimation of material damage and failure can occur as a result of spurious zero-energy modes due to the employment of nodal integration. Recent advances in nodal integration, such as naturally stabilized nodal integration (NSNI), efficiently stabilizes this integration error. When applied to concrete structures under a penetration event, key phenomena such as the radial and circumferential cracking of concrete are effectively captured. The quasi-linear formulation is also introduced, which removes tensile instability as a result of loss of support and allows for linear accuracy in the presence of fragmentation. Smaller support zones may also be utilized, leading to increased computational efficiency. This work is implemented under the nonlinear meshfree analysis program (NMAP) and is used to simulate extreme events such as projectile impact and earthquake induced landslides, and shows good agreement to the experimental data.

Industry Application Area(s)
Aerospace, Defense, Security | Civil/Structural Engineering | Materials

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