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Roberto Ballarini
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Journal Articles

A Numerical Study on the Buckling of Near-Perfect Spherical Shells

Uba K. Ubamanyu, Zheren Baizhikova, Jia-Liang Le, Roberto Ballarini, Pedro M. Reis
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research Papers
J. Appl. Mech. May 2025, 92(5): 051003.
Paper No: JAM-24-1429
https://doi.org/10.1115/1.4067852
Published Online: February 27, 2025
View Article titled, A Numerical Study on the Buckling of Near-Perfect Spherical Shells
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Topics: Buckling, Shells, Simulation, Spherical shells
Journal Articles

Creating Geometric Imperfections in Thin-Walled Structures Using Acoustic Excitation

Jennifer Xue, Zheren Baizhikova, Roberto Ballarini, Tian Chen
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research Papers
J. Appl. Mech. December 2023, 90(12): 121014.
Paper No: JAM-23-1217
https://doi.org/10.1115/1.4062746
Published Online: September 11, 2023
View Article titled, Creating Geometric Imperfections in Thin-Walled Structures Using Acoustic Excitation
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Topics: Acoustics, Buckling, Excitation, Manufacturing, Pressure, Shells, Simulation, Thin wall structures, Geometry, Silicones
Journal Articles

Stochastic Buckling of Geometrically Imperfect Beams on Elastic Foundation

Zheren Baizhikova, Jia-Liang Le, Roberto Ballarini
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research Papers
J. Appl. Mech. January 2023, 90(1): 011003.
Paper No: JAM-22-1308
https://doi.org/10.1115/1.4055811
Published Online: October 13, 2022
View Article titled, Stochastic Buckling of Geometrically Imperfect Beams on Elastic Foundation
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Topics: Buckling, Stress, Statistics
Proceedings Papers

Fatigue and Fracture Testing of Microelectromechanical Systems

Roberto Ballarini, Robert L. Mullen, Harold Kahn, Arthur H. Heuer
Proc. ASME. IMECE98, Mechanical Behavior of Advanced Materials, 151-152, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-1152
https://doi.org/10.1115/IMECE1998-1152
View Paper titled, Fatigue and Fracture Testing of Microelectromechanical Systems
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Topics: Fatigue, Fracture (Materials), Fracture (Process), Microelectromechanical systems, Testing, Bending strength, Crack propagation, Design, Dimensions, Electrostatic actuators
Proceedings Papers

The Fracture Mechanics of Microelectromechanical Systems

Roberto Ballarini
Proc. ASME. IMECE98, Mechanical Behavior of Advanced Materials, 185, November 15–20, 1998
Publisher: American Society of Mechanical Engineers
Paper No: IMECE1998-1165
https://doi.org/10.1115/IMECE1998-1165
View Paper titled, The Fracture Mechanics of Microelectromechanical Systems
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Topics: Fracture mechanics, Microelectromechanical systems, Fatigue cracks, Fracture toughness, Stress corrosion cracking
Journal Articles

Enhanced Pseudo-Three-Dimensional Model for Multiple Hydraulic Fractures

Innokentiy Protasov, Egor Dontsov, Roberto Ballarini
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research Papers
J. Appl. Mech. January 2021, 88(1): 011003.
Paper No: JAM-20-1371
https://doi.org/10.1115/1.4048375
Published Online: October 7, 2020
View Article titled, Enhanced Pseudo-Three-Dimensional Model for Multiple Hydraulic Fractures
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Topics: Fracture (Materials), Fracture (Process), Stress
Journal Articles

A Renewal Weakest-Link Model of Strength Distribution of Polycrystalline Silicon MEMS Structures

Zhifeng Xu, Roberto Ballarini, Jia-Liang Le
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research-Article
J. Appl. Mech. August 2019, 86(8): 081005.
Paper No: JAM-19-1087
https://doi.org/10.1115/1.4043440
Published Online: May 17, 2019
View Article titled, A Renewal Weakest-Link Model of Strength Distribution of Polycrystalline Silicon MEMS Structures
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Topics: Failure, Microelectromechanical systems, Size effect, Statistics, Stress, Polysilicon, Reliability, Strength (Materials), Geometry
Journal Articles

Modeling Flow in Porous Media With Double Porosity/Permeability: Mathematical Model, Properties, and Analytical Solutions

Kalyana B. Nakshatrala, Seyedeh Hanie S. Joodat, Roberto Ballarini
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research-Article
J. Appl. Mech. August 2018, 85(8): 081009.
Paper No: JAM-18-1094
https://doi.org/10.1115/1.4040116
Published Online: June 4, 2018
View Article titled, Modeling Flow in Porous Media With Double Porosity/Permeability: Mathematical Model, Properties, and Analytical Solutions
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Topics: Boundary-value problems, Flow (Dynamics), Mass transfer, Permeability, Porosity, Porous materials, Energy dissipation, Pressure, Fluids
Includes: Supplementary data
Journal Articles

Closed-Path J -Integral Analysis of Bridged and Phase-Field Cracks

Roberto Ballarini, Gianni Royer-Carfagni
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research-Article
J. Appl. Mech. June 2016, 83(6): 061008.
Paper No: JAM-16-1110
https://doi.org/10.1115/1.4032986
Published Online: March 29, 2016
View Article titled, Closed-Path J -Integral Analysis of Bridged and Phase-Field Cracks
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Topics: Fracture (Materials), Tensors
Proceedings Papers

Local-Global Analysis of Crack Growth in Continuously Reinforced Ceramic Matrix Composites

Roberto Ballarini, Shamim Ahmed
Proc. ASME. GT1989, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; General, V005T12A006, June 4–8, 1989
Publisher: American Society of Mechanical Engineers
Paper No: 89-GT-138
https://doi.org/10.1115/89-GT-138
View Paper titled, Local-Global Analysis of Crack Growth in Continuously Reinforced Ceramic Matrix Composites
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Topics: Ceramic matrix composites, Fracture (Materials), Composite materials, Failure, Anisotropy, Fibers, Finite element analysis, Springs
Proceedings Papers

Stability Analysis of Bridged Cracks in Brittle Matrix Composites

Roberto Ballarini, Sandeep Muju
Proc. ASME. GT1991, Volume 5: Manufacturing Materials and Metallurgy; Ceramics; Structures and Dynamics; Controls, Diagnostics and Instrumentation; Education; IGTI Scholar Award; General, V005T13A005, June 3–6, 1991
Publisher: American Society of Mechanical Engineers
Paper No: 91-GT-094
https://doi.org/10.1115/91-GT-094
View Paper titled, Stability Analysis of Bridged Cracks in Brittle Matrix Composites
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Topics: Brittleness, Composite materials, Fracture (Materials), Stability, Fibers, Stress, Crack propagation, Deflection, Failure, Finite element analysis
Journal Articles

Distinct Element Method Modeling of Carbon Nanotube Bundles With Intertube Sliding and Dissipation

Igor Ostanin, Roberto Ballarini, Traian Dumitrică
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Research-Article
J. Appl. Mech. June 2014, 81(6): 061004.
Paper No: JAM-13-1487
https://doi.org/10.1115/1.4026484
Published Online: February 3, 2014
View Article titled, Distinct Element Method Modeling of Carbon Nanotube Bundles With Intertube Sliding and Dissipation
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Topics: Carbon nanotubes, Energy dissipation, Discrete element methods, Deformation, Simulation
Journal Articles

Toward Distinct Element Method Simulations of Carbon Nanotube Systems

Tyler Anderson, Evgeniya Akatyeva, Ilia Nikiforov, David Potyondy, Roberto Ballarini, Traian Dumitrică
Journal: Journal of Nanotechnology in Engineering and Medicine
Publisher: ASME
Article Type: Research Papers
J. Nanotechnol. Eng. Med. November 2010, 1(4): 041009.
https://doi.org/10.1115/1.4002609
Published Online: October 27, 2010
View Article titled, Toward Distinct Element Method Simulations of Carbon Nanotube Systems
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Topics: Carbon nanotubes, Discrete element methods, Simulation
Journal Articles

A Long Crack Penetrating a Transforming Inhomogeneity

Yuping Wang and, Roberto Ballarini
Journal: Journal of Applied Mechanics
Publisher: ASME
Article Type: Brief Notes
J. Appl. Mech. July 2004, 71(4): 582–585.
https://doi.org/10.1115/1.1767166
Published Online: September 7, 2004
View Article titled, A Long Crack Penetrating a Transforming Inhomogeneity
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Topics: Dislocations, Fracture (Materials), Stress, Elastic moduli