Aaditya Lakshmanan

Aaditya Lakshmanan

University of Michigan

H-index: 8

North America-United States

About Aaditya Lakshmanan

Aaditya Lakshmanan, With an exceptional h-index of 8 and a recent h-index of 8 (since 2020), a distinguished researcher at University of Michigan, specializes in the field of Crystal Plasticity, Computational Mechanics, Atomistic Modeling, Finite Element Method.

His recent articles reflect a diverse array of research interests and contributions to the field:

A combined experimental and crystal plasticity study of grain size effects in magnesium alloys

Higher-order approximations for stabilizing zero-energy modes in non-ordinary state-based peridynamics models

Crystal plasticity finite element modeling of grain size and morphology effects on yield strength and extreme value fatigue response

Estimation of micro-Hall-Petch coefficients for prismatic slip system in Mg-4Al as a function of grain boundary parameters

PRISMS-Plasticity: Recent Advancements for Simulating Deformation of Mg Alloys

Crystal Plasticity Constitutive Modeling of Grain Size-Texture Coupling with Application to Mg-4Al

Three-dimensional crystal plasticity simulations using peridynamics theory and experimental comparison

PRISMS-Fatigue computational framework for fatigue analysis in polycrystalline metals and alloys

Aaditya Lakshmanan Information

University

University of Michigan

Position

___

Citations(all)

315

Citations(since 2020)

312

Cited By

43

hIndex(all)

8

hIndex(since 2020)

8

i10Index(all)

8

i10Index(since 2020)

8

Email

University Profile Page

University of Michigan

Aaditya Lakshmanan Skills & Research Interests

Crystal Plasticity

Computational Mechanics

Atomistic Modeling

Finite Element Method

Top articles of Aaditya Lakshmanan

A combined experimental and crystal plasticity study of grain size effects in magnesium alloys

Authors

Aaditya Lakshmanan,Mohsen Taheri Andani,Mohammadreza Yaghoobi,John Allison,Amit Misra,Veera Sundararaghavan

Journal

Journal of Magnesium and Alloys

Published Date

2023/12/1

This work presents a method to incorporate the micro Hall-Petch equation into the crystal plasticity finite element (CPFE) framework accounting for the microstructural features to understand the coupling between grain size, texture, and loading direction in magnesium alloys. The effect of grain size and texture is accounted for by modifying the slip resistances of individual basal and prismatic systems based on the micro Hall-Petch equation. The modification based on the micro Hall-Petch equation endows every slip system at each microstructural point with a slip system-level grain size and maximum compatibility factor, which are in turn used to modify the slip resistance. While the slip-system level grain size is a measure of the grain size, the maximum compatibility factor encodes the effect of the grain boundary on the slip system resistance modification and is computed based on the Luster-Morris factor. The model is …

Higher-order approximations for stabilizing zero-energy modes in non-ordinary state-based peridynamics models

Authors

Iman Javaheri,Jiangyi Luo,Aaditya Lakshmanan,Veera Sundararaghavan

Journal

AIAA Journal

Published Date

2022/8

The non-ordinary state-based peridynamics theory combines non-local dynamic techniques with a desirable correspondence material principle, allowing for the use of continuum mechanics constitutive models. Such an approach presents a unique capability for solving problems involving discontinuities (e.g., fracture and crack propagation). However, the correspondence-based peridynamics models often suffer from zero-energy mode instabilities in numerical implementation, primarily due to the weak integral formulation in non-local approximations of the deformation gradient tensor. This paper focuses on a computational scheme for eliminating the zero-energy mode oscillations using a choice of influence functions that improve the truncation error in a higher-order Taylor series expansion of the deformation gradient. The novelty here is a tensor-based derivation of the linear constraint equations, which can be …

Crystal plasticity finite element modeling of grain size and morphology effects on yield strength and extreme value fatigue response

Authors

Aaditya Lakshmanan,Mohammadreza Yaghoobi,Krzysztof S Stopka,Veera Sundararaghavan

Journal

journal of materials research and technology

Published Date

2022/7/1

A computational framework is presented to include the effects of grain size and morphology in the crystal plasticity finite element (CPFE) method for simulations of polycrystals. The developed framework is used to investigate the effects of grain size and morphology on the yield strength and extreme value fatigue response using a new grain-level length scale. Each grain is approximated by a best-fit ellipsoid, whose information is used to modify the slip resistances based on a Hall-Petch type relation extended to each slip system. The grain-level length scale is computed for each slip system using a shape factor proposed in an earlier work based on discrete dislocation dynamics simulations. This is incorporated into a rate-dependent CPFE model with kinematic and isotropic hardening within the PRISMS-Plasticity open-source software. CPFE simulations are conducted on Al 7075-T6 microstructure models with …

Estimation of micro-Hall-Petch coefficients for prismatic slip system in Mg-4Al as a function of grain boundary parameters

Authors

Mohsen Taheri Andani,Aaditya Lakshmanan,Veera Sundararaghavan,John Allison,Amit Misra

Journal

Acta Materialia

Published Date

2022/3/1

Grain size strengthening, referred to as the Hall-Petch effect, is a common strategy to improve the yield strength of magnesium (Mg) alloys. Several experimental studies have reported that the Hall-Petch slope strongly depends on the texture of the alloy. This effect arises from altering grain boundaries (GBs) resistance to different slip systems to transfer across adjacent grains. The grain boundary barrier strength of certain grain boundaries to basal slip, referred to as basal micro-Hall-Petch, was investigated in the previous work. In this study, the micro-Hall-Petch coefficient values for the prismatic slip (k μ p r i s m a t i c) in Mg-4Al and their correlation with the grain boundary parameters were investigated. An experimental method was developed to initiate the prismatic slip band at low-stress levels. High-resolution electron backscatter diffraction (HR-EBSD) was used to measure the residual stress tensor, from which …

PRISMS-Plasticity: Recent Advancements for Simulating Deformation of Mg Alloys

Authors

Mohammadreza Yaghoobi,Aaditya Lakshmanan,Zhe Chen,Duncan A Greeley,John E Allison,Veera Sundararaghavan

Published Date

2022/2/5

Mg alloys, as lightweight structural materials, can significantly reduce the weight of transportation systems and consequently impact both fuel economy and air pollution . Integrated Computational Materials Engineering (ICME) of Mg alloys has significantly advanced during recent years. An integral part of every ICME framework to design Mg alloys is a tool to model the mechanical response including stress–strain, twinning, cyclic loading, fatigue, deformation mechanisms, etc. Crystal plasticity is a powerful tool which can capture many of the mechanical responses in Mg alloys . An open-source parallel 3-D crystal plasticity finite element (CPFE) software package PRISMS-Plasticity has been developed as an integral part of the PRISMS center and is freely available via GitHub . PRISMS-Plasticity has a wide range of features, and its parallel performance demonstrates that it scales exceptionally well for large problems …

Crystal Plasticity Constitutive Modeling of Grain Size-Texture Coupling with Application to Mg-4Al

Authors

Aaditya Lakshmanan

Published Date

2022

Understanding the microscopic mechanisms and physics governing strength, ductility and failure plays a key role in the development of metallic alloys that can be applied in different applications requiring structural integrity as a key requirement. Tailoring microstructures which are damage-tolerant is essential in many fields of engineering, such as vehicles in the automotive industry and aircrafts in the aerospace industry. For a long period of time, these developments were largely empirical. More recently, however, with developments in computational architectures and methodologies, computational methods have become a common approach to either substitute or complement existing empirical models. In this context, the development of more complex materials with novel architectures leading to superior properties has made it more challenging to analyze, understand and predict their behavior with ad-hoc techniques. This is especially challenging for metals where there is a huge drive towards enhanced performance,

Three-dimensional crystal plasticity simulations using peridynamics theory and experimental comparison

Authors

Aaditya Lakshmanan,Jiangyi Luo,Iman Javaheri,Veera Sundararaghavan

Journal

International Journal of Plasticity

Published Date

2021/7/1

A three-dimensional (3D) peridynamics (PD) model of crystal plasticity (CP) is presented for predicting the fine-scale localization in polycrystalline microstructures undergoing elastoplastic deformation. Microscale data from electron microscopy and digital image correlation have indicated that slip localizations arise early in deformation and act as precursors to mechanical failure and fracture. However, classical numerical approaches such as crystal plasticity finite element methods (CPFEM) are generally unable to predict the emergence and distribution of such localizations. Alternatively, the PD formulation has attracted significant attention for its unique treatment of deformation in the presence of high strain gradient fields. In this paper, a mesh-free non-ordinary state-based PD technique is developed for simulating the elasto-plastic deformation of 3D polycrystalline aggregates of a magnesium alloy. This work …

PRISMS-Fatigue computational framework for fatigue analysis in polycrystalline metals and alloys

Authors

Mohammadreza Yaghoobi,Krzysztof S Stopka,Aaditya Lakshmanan,Veera Sundararaghavan,John E Allison,David L McDowell

Journal

npj Computational Materials

Published Date

2021/3/17

The PRISMS-Fatigue open-source framework for simulation-based analysis of microstructural influences on fatigue resistance for polycrystalline metals and alloys is presented here. The framework uses the crystal plasticity finite element method as its microstructure analysis tool and provides a highly efficient, scalable, flexible, and easy-to-use ICME community platform. The PRISMS-Fatigue framework is linked to different open-source software to instantiate microstructures, compute the material response, and assess fatigue indicator parameters. The performance of PRISMS-Fatigue is benchmarked against a similar framework implemented using ABAQUS. Results indicate that the multilevel parallelism scheme of PRISMS-Fatigue is more efficient and scalable than ABAQUS for large-scale fatigue simulations. The performance and flexibility of this framework is demonstrated with various examples that assess the …

Quantitative study of the effect of grain boundary parameters on the slip system level Hall-Petch slope for basal slip system in Mg-4Al

Authors

Mohsen Taheri Andani,Aaditya Lakshmanan,Veera Sundararaghavan,John Allison,Amit Misra

Journal

Acta Materialia

Published Date

2020/11/1

Several theoretical studies have reported that the geometry and structure of grain boundaries in polycrystalline materials could impose a significant effect on the Hall-Petch slope. However, experimental observations are primarily limited by the ability of the techniques to accurately quantify the grain boundary strength and validate these theoretical models. Using high-resolution electron backscatter diffraction (HR-EBSD), the local stress tensor ahead of a slip band blocked by a grain boundary was quantified and coupled with a continuum dislocation pile-up model to assess the barrier strength of specific grain boundaries to specific slip systems, referred to as micro-Hall-Petch coefficient. For basal slip system in a deformed Mg-4Al alloy, the micro-Hall-Petch coefficient (k μ b a s a l) varied significantly, from 0.054 to 0.184 MPa− m 1/2 for nine different grain boundaries. These results were correlated with geometric …

A quantitative study of stress fields ahead of a slip band blocked by a grain boundary in unalloyed magnesium

Authors

Mohsen Taheri Andani,Aaditya Lakshmanan,Mohammadreza Karamooz-Ravari,Veera Sundararaghavan,John Allison,Amit Misra

Journal

Scientific reports

Published Date

2020/2/20

Stress localization ahead of a slip band blocked by a grain boundary is measured for three different grain boundaries in unalloyed Mg using high-resolution electron backscatter diffraction (HR-EBSD). The results are compared with a theoretical dislocation pile-up model, from which slip system resistance and micro-Hall–Petch coefficients for different grain boundary types are deduced. The results indicate that grain boundary character plays a crucial role in determining micro-Hall–Petch coefficients, which can be used to strengthen classical crystal plasticity constitutive models to make predictions linked to the effect of grain boundary strengthening.

See List of Professors in Aaditya Lakshmanan University(University of Michigan)

Aaditya Lakshmanan FAQs

What is Aaditya Lakshmanan's h-index at University of Michigan?

The h-index of Aaditya Lakshmanan has been 8 since 2020 and 8 in total.

What are Aaditya Lakshmanan's top articles?

The articles with the titles of

A combined experimental and crystal plasticity study of grain size effects in magnesium alloys

Higher-order approximations for stabilizing zero-energy modes in non-ordinary state-based peridynamics models

Crystal plasticity finite element modeling of grain size and morphology effects on yield strength and extreme value fatigue response

Estimation of micro-Hall-Petch coefficients for prismatic slip system in Mg-4Al as a function of grain boundary parameters

PRISMS-Plasticity: Recent Advancements for Simulating Deformation of Mg Alloys

Crystal Plasticity Constitutive Modeling of Grain Size-Texture Coupling with Application to Mg-4Al

Three-dimensional crystal plasticity simulations using peridynamics theory and experimental comparison

PRISMS-Fatigue computational framework for fatigue analysis in polycrystalline metals and alloys

...

are the top articles of Aaditya Lakshmanan at University of Michigan.

What are Aaditya Lakshmanan's research interests?

The research interests of Aaditya Lakshmanan are: Crystal Plasticity, Computational Mechanics, Atomistic Modeling, Finite Element Method

What is Aaditya Lakshmanan's total number of citations?

Aaditya Lakshmanan has 315 citations in total.

What are the co-authors of Aaditya Lakshmanan?

The co-authors of Aaditya Lakshmanan are David McDowell, Amit Misra, John E. Allison, Veera Sundararaghavan.

    Co-Authors

    H-index: 93
    David McDowell

    David McDowell

    Georgia Institute of Technology

    H-index: 88
    Amit Misra

    Amit Misra

    University of Michigan-Dearborn

    H-index: 49
    John E. Allison

    John E. Allison

    University of Michigan-Dearborn

    H-index: 36
    Veera Sundararaghavan

    Veera Sundararaghavan

    University of Michigan-Dearborn

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