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# Amit Acharya's blog

## On Weingarten-Volterra defects

Sat, 2017-10-14 16:00 - Amit AcharyaAmit Acharya

The kinematic theory of Weingarten-Volterra line defects is revisited, both at small and finite deformations. Existing results are clarified and corrected as needed, and new results are obtained. The primary focus is to understand the relationship between the disclination strength and Burgers vector of deformations containing a Weingarten-Volterra defect corresponding to different cut-surfaces.

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## Professor Walter Noll

Thu, 2017-06-08 11:01 - Amit AcharyaBelow is a message from the Secretary of the Society for Natural Philosophy. A formative influence of our field passes on.

Dear Members of the Society for Natural Philosophy.

We are sorry to be the bearers of sad news, but on Tuesday June 6th, 2017, Walter Noll passed away at his home in Pittsburgh surrounded by his wife Marilyn and two children, Victoria and Peter. He was a founding member and a past Chairman of the Society. He made major contributions to the fields of continuum mechanics and thermodynamics. There will be a memorial service at Carnegie Mellon University, which has yet to be scheduled.

Secretary,

Wladimir Neves.

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## Fracture and singularities of the mass-density gradient field

Sun, 2017-01-22 14:44 - Amit AcharyaTo appear in Journal of Elasticity

A continuum mechanical theory of fracture without singular fields is proposed. The primary

contribution is the rationalization of the structure of a `law of motion' for crack-tips, essentially

as a kinematical consequence and involving topological characteristics. Questions of compatibility

arising from the kinematics of the model are explored. The thermodynamic driving force

for crack-tip motion in solids of arbitrary constitution is a natural consequence of the model.

The governing equations represent a new class of pattern-forming equations.

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## Fluids, Elasticity, Geometry, and the Existence of Wrinkled Solutions

Sun, 2016-05-22 20:23 - Amit AcharyaAmit Acharya, Gui-Qiang Chen, Siran Li, Marshall Slemrod, and Dehua Wang

(To appear in Archive for Rational Mechanics and Analysis)

We are concerned with underlying connections between fluids,

elasticity, isometric embedding of Riemannian manifolds, and the existence of

wrinkled solutions of the associated nonlinear partial differential equations. In

this paper, we develop such connections for the case of two spatial dimensions,

and demonstrate that the continuum mechanical equations can be mapped into

a corresponding geometric framework and the inherent direct application of

the theory of isometric embeddings and the Gauss-Codazzi equations through

examples for the Euler equations for fluids and the Euler-Lagrange equations

for elastic solids. These results show that the geometric theory provides an

avenue for addressing the admissibility criteria for nonlinear conservation laws

in continuum mechanics.

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## A microscopic continuum model for defect dynamics in metallic glasses

Fri, 2016-03-04 23:01 - Amit AcharyaAmit Acharya Michael Widom

To appear in *Journal of the Mechanics and Physics of Solids*

Motivated by results of the topological theory of glasses accounting for geometric frustration,

we develop the simplest possible continuum mechanical model of defect dynamics in metallic

glasses that accounts for topological, energetic, and kinetic ideas. A geometrical description

of ingredients of the structure of metallic glasses using the concept of local order based on

Frank-Kasper phases and the notion of disclinations as topological defects in these structures is

proposed. This novel kinematics is incorporated in a continuum mechanical framework capable

of describing the interactions of disclinations and also of dislocations (interpreted as pairs of

opposite disclinations). The model is aimed towards the development of a microscopic understanding

of the plasticity of such materials. We discuss the expected predictive capabilities of

the model vis-a-vis some observed physical behaviors of metallic glasses.

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## Microstructure in plasticity without nonconvexity

Tue, 2015-12-22 05:47 - Amit AcharyaAmit Das Amit Acharya Pierre Suquet

To appear in Special issue of Computational Mechanics on "Connecting Multiscale Mechanics to Complex Material Design"; Guest Editors: Wing Kam Liu, Jacob Fish, J. S Chen, Pedro Camanho; Issue dedicated to Ted Belytschko

A simplified one dimensional rate dependent model for the evolution of plastic distortion is obtained from a three dimensional mechanically rigorous model of mesoscale field dislocation mechanics. Computational solutions of variants of this minimal model are investigated to explore the ingredients necessary for the development of microstructure. In contrast to prevalent notions, it is shown that microstructure can be obtained even in the absence of non-monotone equations of state. In this model, incorporation of wave propagative dislocation transport is vital for the modeling of spatial patterning. One variant gives an impression of producing stochastic behavior, despite being a completely deterministic model. The computations focus primarily on demanding macroscopic limit situations, where a convergence study reveals that the model-variant including non-monotone equations of state cannot serve as effective equations in the macroscopic limit; the variant without non-monotone ingredients, in all likelihood, can.

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## Prof. Ray Ogden wins Rodney Hill Prize in Solid Mechanics

Sat, 2015-10-10 12:02 - Amit Acharya2016 Rodney Hill Prize in Solid Mechanics

Congratulations!

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## The metric-restricted inverse design problem

Thu, 2015-01-08 19:42 - Amit AcharyaAmit Acharya Marta Lewicka Mohammad Reza Pakzad

In Nonlinearity, 29, 1769-1797

We study a class of design problems in solid mechanics, leading to a variation on the

classical question of equi-dimensional embeddability of Riemannian manifolds. In this general new

context, we derive a necessary and sufficient existence condition, given through a system of total

differential equations, and discuss its integrability. In the classical context, the same approach

yields conditions of immersibility of a given metric in terms of the Riemann curvature tensor.

In the present situation, the equations do not close in a straightforward manner, and successive

differentiation of the compatibility conditions leads to a more sophisticated algebraic description

of integrability. We also recast the problem in a variational setting and analyze the infimum value

of the appropriate incompatibility energy, resembling "non-Euclidean elasticity". We then derive a

Γ-convergence result for the dimension reduction from 3d to 2d in the Kirchhoff energy scaling

regime. A practical implementation of the algebraic conditions of integrability is also discussed.

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## From dislocation motion to an additive velocity gradient decomposition, and some simple models of dislocation dynamics

Thu, 2014-05-01 12:27 - Amit AcharyaAmit Acharya Xiaohan Zhang

(Chinese Annals of Mathematics, 36(B), 2015, 645-658. Proceedings of the International Conference on Nonlinear and Multiscale Partial Differential Equations: Theory, Numerics and Applications held at Fudan University, Shanghai, September 16-20, 2013, in honor of Luc Tartar.)

## Scaling theory of continuum dislocation dynamics in three dimensions: Self-organized fractal pattern formation

Sat, 2014-02-08 14:07 - Amit AcharyaY. S. Chen, W. Choi, S. Papanikolaou, M. Bierbaum, J. P. Sethna

## Carlson - Mathematical Preliminaries and Continuum Mechanics 1991

Fri, 2013-12-27 23:11 - Amit AcharyaI attach some class notes developed by the late Professor Donald Carlson from which many generations of students at the University of Illinois learnt Continuum Mechanics.

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## Numerical implementation of static Field Dislocation Mechanics theory for periodic media

Fri, 2013-12-13 12:35 - Amit AcharyaR. Brenner A. J. Beaudoin P. Suquet A. Acharya

(to appear in Philosophical Magazine)

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## Continuum mechanics of the interaction of phase boundaries and dislocations in solids

Sun, 2013-11-03 06:24 - Amit AcharyaAmit Acharya Claude Fressengeas

Springer Proceedings in Mathematics and Statistics on Differential Geometry and Continuum Mechanics, Vol. 137, pages 123-165. Ed: G. Q Chen, M. Grinfeld, R.J. Knops (Proceedings of Workshop held at the Intl. Centre for Mathematical Sciences in Edinburgh, 2013.)

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## Dislocation motion and instability

Mon, 2013-03-25 12:37 - Amit AcharyaYichao Zhu Stephen J. Chapman Amit Acharya

(to appear in Journal of the Mechanics and Physics of Solids)

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## Subra Suresh chosen as Ninth President of Carnegie Mellon University

Thu, 2013-02-07 11:01 - Amit Acharya- Read more about Subra Suresh chosen as Ninth President of Carnegie Mellon University
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## An observation on the experimental measurement of dislocation density

Fri, 2013-01-04 22:29 - Amit AcharyaAmit Acharya and Robin J. Knops

(to appear in Journal of Elasticity)

The common practice of ignoring the elastic strain gradient in measurements of geometrically necessary dislocation (GND) density is critically examined. It is concluded that the practice may result in substantial errors. Our analysis points to the importance of spatial variations of the elastic strain field in relation to its magnitude in inferring estimates of dislocation density from measurements.

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## A fundamental improvement to Ericksen-Leslie kinematics

Thu, 2012-11-01 11:36 - Amit AcharyaHossein Pourmatin Amit Acharya Kaushik Dayal

(to appear in Quarterly of Applied Mathematics)

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## From Boltzmann to Euler: Hilbert's 6th Problem Revisited

Fri, 2012-08-24 21:07 - Amit AcharyaBeautiful stuff!!

From Boltzmann to Euler: Hilbert's 6th Problem Revisited

Marshall Slemrod

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## Boundary conditions and gradient discontinuity in lower-order gradient plasticity

Sun, 2012-08-12 18:51 - Amit Acharya- Read more about Boundary conditions and gradient discontinuity in lower-order gradient plasticity
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## Jump condition for GND evolution

Sat, 2012-08-11 10:34 - Amit AcharyaAcharya, A., Jump conditions for GND evolution as a constraint on slip transmission at grain boundaries, Philosophical Magazine, 87(8-9), 1349-1359, 2007 (see attachment)

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## A mathematician's take on "what is light?"

Sun, 2012-01-29 20:26 - Amit AcharyaAttached is an intriguing commentary on the scientific method through an example, written by my good friend, Luc Tartar. The specific example is that of trying to understand what 'light' might be, especially from a mathematician's point of view. The mathematician in this case is an extremely talented one, who also happens to actually understand a whole lot of physics and mechanics.

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## Incomplete thoughts on mass flux and superposed RBM

Sat, 2012-01-14 12:31 - Amit AcharyaAttached are some (hand-written) observations on wanting to do continuum mechanics when mass is not conserved for fixed sets of particles of the body (so, situations transcending the rocket-losing-mass type). I feel (un)comfortable with these observations, depending upon the day I think about such things.

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## Anisotropic yield, plastic spin, and dislocation mechanics

Sun, 2011-10-02 11:37 - Amit Acharya(This paper is to appear in the IUTAM Procedia on "Linking scales in computations: from microstructure to macro-scale properties," edited by Oana Cazacu)

Amit Acharya, S. Jonathan Chapman

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## Coupled phase transformations and plasticity as a field theory of deformation incompatibility

Tue, 2011-08-30 15:58 - Amit Acharya(to appear in International Journal of Fracture; Proceedings of the 5th Intl. Symposium on Defect andMaterial Mechanics)

Amit Acharya and Claude Fressengeas

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## Time-averaged coarse variables for multiscale dynamics

Mon, 2011-08-29 21:31 - Amit Acharya(to appear in Quarterly of Applied Mathematics)

by Marshall Slemrod and Amit Acharya

Given an autonomous system of Ordinary Diff erential Equations without an a priori split into slow and fast components, we defi ne a strategy for producing a large class of `slow' variables (constants of fast motion) in a precise sense. The equation of evolution of any such slow variable is deduced. The strategy is to rewrite our system on an in finite dimensional "history" Hilbert space X and defi ne our coarse observation as a functional on X.

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