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Research Topics and Projects for Pradeep Lall |
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Areas of Interest: Mechanical Behavior of Materials, Computational Mechanics, Electronic Packaging, Nano-Structures, Reliability, Prognostics, Failure Mechanisms, Life Prediction. |
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Thermo-mechanics of Electronics in Harsh Environments
Electronics
in harsh environments is exposed to temperature (100 to 200°C),
humidity (100% RH), pressure (vacuum-to-high-pressure). Deformation
and failure response of commercial fine-pitch electronics in harsh
environments is not well understood. Environments being studied
include - automotive underhood, on-transmission, unmanned airborne
vehicles (UAV), unmanned ground-vehicles (UGV), tank, missile, avionics and space
applications.
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Prognostics and Health-Monitoring of Electronic Structures Leading indicators-of-failure are being developed for interrogation of material state significantly prior to appearance of any macro-indicators. The research focus is on determination of residual life of electronic systems via on-board sensing, damage-detection algorithms and data processing. Environments being studied include single, sequential, simultaneous thermo-mechanical, hygro-mechanical and dynamic loads.
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Constitutive-Behavior of Electronic Materials
Material
constitutive behavior of electronic materials at small-length scales
is not well-understood. Lack of material data limits the prediction
capability and accuracy of computational models. Electronic
materials being studied include leadfree solders, low-k dielectrics,
underfills, thin-film adhesives, fine-pitch copper traces and conformal
coats.
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Transient-Dynamics of Microcircuits and MEMS in Shock and Vibration
Micro-circuits
and Micro-electromechanical systems are subject to accidental drop,
shock-impact, large velocity deformation, and shock due to nearby
impact in portable electronic applications. Damage initiation
and progression in materials and interfaces, methodologies for
survivability-prediction are not well understood. Applications being
studied include - cellular phones, PDAs, notebook computers, missiles,
tanks and unmanned airborne vehicles.
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Multi-Scale Modeling of Nano-Structures Nanotechnology offers the promise of engineering materials at atomistic scales. Correlation of the mechanics of nano-phenomena with macro-scale material response is essential for engineering newer materials. Applications being studied include electronic nano-underfills, atomistic aspects of adhesion, nano-indentation, molecular details of fracture, elasticity of single macromolecular chains, gaseous storage in nano-particles, bio-molecular bond strength measurements, and molecular motors.
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