A5007991455- Numerical methods in engineering
- Geotechnical Engineering and Underground Structures
- Fatigue and fracture mechanics
- Electronic Packaging and Soldering Technologies
- Mechanical Behavior of Composites
- High-Velocity Impact and Material Behavior
- Fluid Dynamics Simulations and Interactions
- Metal Forming Simulation Techniques
- Mechanical stress and fatigue analysis
- Electromagnetic Simulation and Numerical Methods
- 3D IC and TSV technologies
- Composite Structure Analysis and Optimization
- Structural Analysis of Composite Materials
- Geophysical Methods and Applications
- Ultrasonics and Acoustic Wave Propagation
- Metallurgy and Material Forming
- Carbon Nanotubes in Composites
- Fluid Dynamics and Heat Transfer
- Epoxy Resin Curing Processes
- Silicon Carbide Semiconductor Technologies
- Adhesion, Friction, and Surface Interactions
- Engineering Structural Analysis Methods
- Erosion and Abrasive Machining
- Mechanical and Thermal Properties Analysis
- Metal and Thin Film Mechanics
Virginia Commonwealth University
2016-2025
General Electric (Norway)
2021-2023
Technische Universität Dresden
2021-2023
Texas Instruments (United States)
2021-2023
University of Waterloo
2023
Intel (United Kingdom)
2022-2023
HRL Laboratories (United States)
2022
T3 Scientific (United States)
2022
Binghamton University
2021
University of Richmond
2019
This study presents a methodology to predict the fatigue failure of materials due cyclic loading within realm peridynamic theory. approach incorporates material intrinsically without need for external crack growth criteria and post-processing. Failure occurs when where it is energetically favorable. Fatigue life prediction natural extension initiation while allowing degradation. The present focuses on phase rather than initiation. During phase, degrades, process viewed as quasi-static series...
Abstract This study presents an application of peridynamic theory for predicting residual strength impact damaged building components by considering a reinforced panel subjected to multiple load paths. The validity the approach is established first simulating controlled experiment resulting in mixed-mode fracture concrete. agreement between PD prediction and experimentally observed behavior remarkable especially simple material model used Subsequently, simulation concerns damage assessment...
The life-prediction analysis of an electronic package requires a sequence critical assumptions concerning the finite element models, such as slice model and global with or without submodel. Although specifics analyses are available in literature, comparison among themselves against same measured life cycles does not exist. This study addresses questions arising during by considering two particular packages different geometric material compositions. Solder joint reliability for each performed...
The numerical simulation of droplet impingement at high Mach numbers is a challenging problem, involving wide range physical mechanisms, including material and flow discontinuities, interfacial instabilities, phase change, turbulence. Diffuse interface multiphase methods provide simple, computationally efficient, numerically robust approach to model these phenomena. In this work, higher-order solution procedure for the Allaire five-equation used within in-house solver CHAMPS (previously...
Atmospheric droplets may collide with high-speed vehicle surfaces during flight and lead to complex droplet-structure interactions. To analyze these interactions, a two-phase fluid dynamics solver is coupled peridynamics based structural using sharp interface immersed boundary method. This integrated approach first validated for an elastic fluid-structure interaction problem, then applied investigate the impact of axisymmetric at Mach numbers ranging from 1 4. The study investigates one-way...
In this study, waterdrop impact damage on zinc sulfide was analyzed by using a non-ordinary state-based peridynamics method. A ceramic material model, Johnson-Holmquist-Beissel (JHB) developed as correspondence model approach into framework. Zinc sulfide, which is commonly used in the aerospace industry modeled approach. High-speed can cause significant materials especially at supersonic and hypersonic ranges. This issue needs to be addressed computational algorithms further resistance of...
Finite element method and peridynamic theory are coupled via submodeling approach to investigate the dynamic response damage in an electronic package subjected impact loading arising from drop-shock. The global modeling is performed using finite while employed for failure prediction. analysis yielded outermost solder joint as critical with at interface between copper pad on PCB side.
In this study a peridynamics approach is used in combination with higher-order computational fluid dynamics to predict deformation of ductile metallic target due water droplet impact. The simulates the droplet-shock interaction and provides distorted shape prior converted peridynamic grid impact event simulated. For droplets, material model conjunction equation state used. target, Johnson-Cook crater depth predictions agree theoretical curve constructed based on an experimental target....
This study presents a comparison of extended finite elements (XFEM), cohesive zone model (CZM) and the peridynamic theory (PD). By comparisons against two experimental benchmark studies, capability these techniques to predict dynamic fracture is demonstrated through both qualitative quantitative observations.
A new experimental method to characterize the mechanical properties of metallic nanowires is introduced. An accurate and fast characterization requires simultaneous imaging testing nanowires. However, existing techniques fail accomplish this goal due either lack capability test setup or difficulty individual alignment manipulation single for each test. In study, nanowire specimens prepared by an electroplating technique are located on a silicon substrate with trenches. customized atomic...
Micro transfer printing and other forms of micro assembly deterministically produce heterogeneously integrated systems miniaturized components on non-native substrates. Most assembled include electrical interconnections to the components, typically accomplished by metal wires formed substrate after operation. An alternative scheme establishing during operation is a cost-effective manufacturing method for producing heterogeneous microsystems, facilitates repair such as displays, ex post facto...
This study investigates moisture diffusion characteristics of electronic packaging materials exhibiting Fickian and non-Fickian behaviors. The experimental investigation involves absorption desorption tests homogenous underfill inhomogeneous organic substrates representing solids, respectively. In tests, samples are dried out in an oven prior to testing a humid environmental chamber. saturated chamber under specified temperature relative humidity the inside oven. Samples both removed from...
In this study, a new approach for predicting damage and specific failure modes in laminated fiber reinforced composites is presented. The method based on the peridynamic theory models individual plies, represents matrix materials each ply explicitly. These features enable analysis of laminates with arbitrary orientation convenient manner. Additionally, mode identification algorithm has been developed implemented. Instead conventional parameter, works broken bonds, which makes different...