Plasticity and Damage Size Effects at the Micron and Nano Length Scales

The emerging areas of micro- and nano-devices exhibit important strength differences that result from continuous modification of the material microstructural characteristics with changing size, whereby the smaller is the size the stronger is the response. This resulted in an increasing need for basic research to better understand the underlying deformation mechanisms at the micron and nano length scales. For example, experimental works have shown increase in strength by decreasing the particle size in particle-reinforced composites, the diameter of thin wires in micro-torsion and uniaxial compression, the thickness of thin films in micro-bending and uniaxial tension, the grain size of polycrystalline materials, void size in porous media, the indentation depth in micro/nano indentation tests etc.

This symposium focuses upon presenting experimental, theoretical, and/or computational results that will increase our understanding of the deformation mechanisms responsible for size effects at the micron and nano length scales in metals and metal alloys, ceramics, polymers, composites, etc. Presentation topics include but are not limited to the following areas: Size effect in thin films, composites, micro/nano indentation, fracture toughness, fatigue resistance, initial yield strength, and hardening; grain size effect; surface and interface effects; strain-gradient plasticity/damage theories; dislocation mechanics; size effect testing techniques; and measurement of material length scales.

Organizers


Schedule

Wednesday 1

Room Time Talk
Excellence Room 8:00 AM Elasticity and Strength Size Effects in Zinc Oxide Nanowires
Horacio Espinosa, Bei Peng, Ravi Agrawal, Eleftherios Gdoutos
Excellence Room 8:20 AM Nonlinear elasticity, slip, and mechanical twinning in ceramic crystals
John Clayton
Excellence Room 8:40 AM A Methodology for Studying Hydrogen Embrittlement in a Steel Pipeline
Mohsen Dadfarnia, Petros Sofronis, Brian P. Somerday, Ian M. Robertson
Excellence Room 9:00 AM Prediction of Micro and Nano Indentation Size Effects from Pyramidal and Spherical Indentation
Rashid K. Abu Al-Rub
Excellence Room 9:20 AM Bauschinger Effect in Unpassivated Freestanding Metal Thin Films
Jagannathan Rajagopalan, Jong H. Han, Taher A. Saif

Wednesday 2

Room Time Talk
Excellence Room 11:00 AM A Micromechanical Model for the Nonlinear Viscoelastic-Viscoplastic Behaviors of Hybrid Composites
Anastasia Muliana, Jeongsik Kim
Excellence Room 11:20 AM Fatigue Damage Evolution and Reliability Assessment of Cu and Solder Interconnects in 3D Integrated Circuits
Leila Ladani
Excellence Room 11:40 AM Fractal Pattern Formation at Elastic-Plastic Transition in Heterogeneous Materials
Martin Ostoja-Starzewski, Jun Li
Excellence Room 12:00 PM Strain Gradient Plasticity with Interface Energy Effects using Consistent Thermodynamics
George Voyiadjis, Babur Deliktas
Excellence Room 12:20 PM Role of Size Effects on Plastic Deformation of Free-Standing Cu Films
Ashraf Bastawros, Shakti S. Chauhan

Wednesday 3

Room Time Talk
Excellence Room 2:00 PM Interface and surface effects in the mechanical behavior of crystalline materials
Marisol Koslowski, Abigail Hunter
Excellence Room 2:20 PM Strain Localization in Anisotropic Plastic Materials undergoing Microstructural Evolution
Haizhen Pan, J.l. Bassani
Excellence Room 2:40 PM On the Higher-order Nonlocal Gradient Plasticity Theory and its Non-classical Microscopic Boundary Conditions for Size Effects
Rashid K. Abu Al-Rub
Excellence Room 3:00 PM An analysis of the size effect in void growth in single crystals using discrete dislocation dynamics
Javier Segurado, Ignacio Romero, Javier Llorca
Excellence Room 3:20 PM Multiscale modeling of covalent materials through an atomistic field theory
Liming Xiong, Youping Chen