Fatemeh Pourahmadian

Calibrating a finite-strain phase-field model of fracture for bonded granular materials with uncertainty quantification

Abigail C. Schmid, Erik C. Jensen, Fabio Di Gioacchino, Pooyan B. Javadzadeh et autres

To study the mechanical behavior of mock high explosives, an experimental and simulation program was developed to calibrate, with quantified uncertainty, a material model of the bonded granular material Idoxuridine and nitroplasticized Estane-5703. This paper reports on the efficacy of such a …

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Calibrating a Finite-strain Phase-field Model of Fracture for Bonded Granular Materials with Uncertainty Quantification

E. T. Jensen, Fabio Di Gioacchino, Pooyan B. Javadzadeh, C. Gus Becker et autres

To study the mechanical behavior of mock high explosives, an experimental and simulation program was developed to calibrate, with quantified uncertainty, a material model of the bonded granular material Idoxuridine and nitroplasticized Estane-5703. This paper reports on the efficacy of such a …

Micropolar deep material network

Noah M. Francis, Dongil Shin, Ricardo A. Lebensohn, Fatemeh Pourahmadian et autres

Deep regularization networks for inverse problems with noisy operators

Fatemeh Pourahmadian, Yang Xu

A supervised learning approach is proposed for regularization of large inverse problems where the main operator is built from noisy data. This is germane to superresolution imaging via the sampling indicators of the inverse scattering theory. We aim to accelerate the spatiotemporal …

Network scaling and scale-driven loss balancing for intelligent characterization of poroelastic systems

Yang Xu, Fatemeh Pourahmadian

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Micropolar Elastoplasticity Using a Fast Fourier Transform‐Based Solver

Noah M. Francis, Ricardo A. Lebensohn, Fatemeh Pourahmadian, Rémi Dingreville

ABSTRACT This work presents a micromechanical spectral formulation for obtaining the full‐field and homogenized response of elastoplastic micropolar composites. A closed‐form radial‐return mapping is derived from thermodynamics‐based micropolar elastoplastic constitutive equations to determine the increment of plastic strain necessary to return the …

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Laser Ultrasonic Imaging Via the Time Domain Linear Sampling Method

Jian Song, Fatemeh Pourahmadian, Todd W. Murray, Venkatalakshmi V. Narumanchi

This study investigates the imaging ability of the time-domain linear sampling method (TLSM) when applied to laser ultrasonic (LU) tomography of subsurface defects from limited-aperture measurements. In this vein, the TLSM indicator and its spectral counterpart known as the multifrequency LSM are …

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Laser Ultrasonic Imaging via the Time Domain Linear Sampling Method

Jian Song, Fatemeh Pourahmadian, Todd W. Murray, Venkatalakshmi V. Narumanchi

This study investigates the imaging ability of the time-domain linear sampling method (TLSM) when applied to laser ultrasonic (LU) tomography of subsurface defects from limited-aperture measurements. In this vein, the TLSM indicator and it spectral counterpart known as the multifrequency LSM are …

Network scaling and scale-driven loss balancing for intelligent poroelastography

Yang Xu, Fatemeh Pourahmadian

A deep learning framework is developed for multiscale characterization of poroelastic media from full waveform data which is known as poroelastography. Special attention is paid to heterogeneous environments whose multiphase properties may drastically change across several scales. Described in space-frequency, the data …

Ensemble WSINDy for Data Driven Discovery of Governing Equations from Laser-based Full-field Measurements

Alireza Doostan, Fatemeh Pourahmadian

This work leverages laser vibrometry and the weak form of the sparse identification of nonlinear dynamics (WSINDy) for partial differential equations to learn macroscale governing equations from full-field experimental data. In the experiments, two beam-like specimens, one aluminum and one IDOX/Estane composite, …

Micropolar elastoplasticity using a fast Fourier transform-based solver

Noah M. Francis, Ricardo A. Lebensohn, Fatemeh Pourahmadian, Rémi Dingreville

This work presents a micromechanical spectral formulation for obtaining the full-field and homogenized response of elastoplastic micropolar composites. A closed-form radial-return mapping is derived from thermodynamics-based micropolar elastoplastic constitutive equations to determine the increment of plastic strain necessary to return the generalized …

Network Scaling and Scale-Driven Loss Balancing for Intelligent Characterization of Poroelastic Systems

Fatemeh Pourahmadian, Yang Xu