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Emilio Martínez Pañeda's picture

Phase field fracture modelling using quasi-Newton methods and a new adaptive step scheme

Dear iMechanicians,

I hope this paper is of interest to you. We show that quasi-Newton methods make monolithic phase field fracture implementations very robust. Convergence and computations times orders of magnitude smaller than the usual staggered approaches are demonstrated in complex problems such as unstable cracking, fatigue or dynamic crack branching.

XiaoyaoPeng's picture

Effective Response of Heterogeneous Materials using the Recursive Projection Method

This is the preprint of an article that will appear in Computer Methods in Applied Mechanics and Engineering (

Effective Response of Heterogeneous Materials using the Recursive Projection Method

Zheng Jia's picture

A constitutive model of microfiber reinforced anisotropic hydrogels: With applications to wood-based hydrogels

Jian Cheng, Zheng Jia*, Teng Li*, A constitutive model of microfiber reinforced anisotropic hydrogels: with applications to wood-based hydrogels, Journal of the Mechanics and Physics of Solids, 138 (2020) 103893 (DOI:

Ying Li's picture

Journal Club for March 2020: Molecular Simulation-Guided and Physics-Informed Multiscale Modeling of Polymer Viscoelasticity

Journal Club for March 2020: Molecular Simulation-Guided and Physics-Informed Multiscale Modeling of Polymer Viscoelasticity

Ying Li, Department of Mechanical Engineering, University of Connecticut

1.       Introduction

linst06's picture

Fatigue-resistant hydrogel adhesion

This is our recent work on the design of fatigue-resistant hydrogel adhesion. In this work, we show that fatigue-resistant hydrogel adhesion can be achieved by anchoring ordered nanocrystalline domains at the interface. This method is applicable to glass, ceramic, titanium, aluminum, stainless steel, and even elastomers including PU and PDMS. We also demonstrate its potential applications as endurant hydrogel coatings for versatile engineering materials with complex geometries.

Baoxing Xu's picture

Capillary transfer of soft films

Yue Zhang, Mengtian Yin, Yongmin Baek, Kyusang Kim, Giovnni Zangari, Liheng Cai, Baoxing Xu. Capillary Transfer of Soft Films. Proceedings of the National Academy of Sciences.

Amit Acharya's picture

Computing with non-orientable defects: nematics, smectics and natural patterns

Chiqun Zhang         Amit Acharya        Alan C Newell          Shankar C Venkataramani


Defects, a ubiquitous feature of ordered media, have certain universal features, independent of the underlying physical system, reflecting their topological, as opposed to energetic properties. We exploit this universality, in conjunction with smoothing defects by "spreading them out," to develop a modeling framework and associated numerical methods that are applicable to computing energy driven behaviors of defects across the amorphous-soft-crystalline materials spectrum. Motivated by ideas for dealing with elastic-plastic solids with line defects, our methods can handle order parameters that have a head-tail symmetry, i.e. director fields, in systems with a continuous translation symmetry, as in nematic liquid crystals, and in systems where the translation symmetry is broken, as in smectics and convection patterns. We illustrate our methods with explicit computations.


Hector Fellow Academy's picture

Carry out your own PhD project in Deformation & Fracture Processes / Tribology / Interface in Metals & Ceramics supervised by Prof. Peter Gumbsch


The Hector Fellow Academy offers you the opportunity to realize a self-developed research project under supervision Prof. Peter Gumbsch. He is one of the Hector Fellows, a community of outstanding professors from different research institutions across Germany working in STEM-subjects, medicine, and psychology.


Yang Lu's picture

Elastic straining of free-standing monolayer graphene

The extraordinary mechanical properties of graphene were measured on very small or supported samples. In our new paper published in Nature Communications, by developing a protocol for sample transfer, shaping and straining, we report the outstanding elastic properties and stretchability of free-standing single-crystalline monolayer graphene under in situ tensile tests.

Jingjie Yeo's picture

Adverse effects of Alport syndrome-related Gly missense mutations on collagen type IV: Insights from molecular simulations and experiments Our unified experimental and computational approach provided underlying insights needed to guide potential therapies for Alport syndrome (AS) that ameliorate the adverse effects from AS disease onset and progression. Patients with AS exhibit blood and elevated protein levels in their urine, inflamed kidneys, and many other abnormalities.

Shuozhi Xu's picture

Call for papers: Nanofabrication, Atomic and Close-to-atomic Scale Manufacturing

A Special Issue entitled "Nanofabrication, Atomic and Close-to-atomic Scale Manufacturing" for the journal Nanomanufacturing and Metrology is now open for submission:

The submission deadline is June 15, 2020. For more information, please refer to the attached flier or this webpage:

User material subroutine for Johnson Cook Model in LS DYNA

Choose a channel featured in the header of iMechanica: 

I need to edit user subroutine for existing Johnson Cook model (MAT_015) in LS DYNA. I have downloaded object files. However, I could not find any subroutine file for MAT_015. I need to edit the model and add 2 more parameters to increase its accuracy. Creating it from scratch is really a lengthy task. Can anyone help me in this regard? Thank you. 

Zheng Jia's picture

Highly stretchable bilayer lattice structures that elongate via in-plane deformation

Burebi Yiming, Lei Wu, Mingqi Zhang, Zilong Han, Pei Zhao, Tiefeng Li, Zheng Jia*, Shaoxing Qu, Highly Stretchable Bilayer Lattice Structures that Elongate via in-Plane Deformation, Advanced Functional Materials, 2020, 1909473 (DOI:

Teng Cui's picture

Fatigue of Graphene

Materials can suffer mechanical fatigue when subjected to cyclic loading at stress levels much lower than the ultimate tensile strength, and understanding this behaviour is critical to evaluating long-term dynamic reliability. The fatigue life and damage mechanisms of two-dimensional (2D) materials, of interest for mechanical and electronic applications, are currently unknown. Here, we present a fatigue study of freestanding 2D materials, specifically graphene and graphene oxide (GO).

mbessa's picture

Journal Club for February 2020: Machine Learning in Mechanics: simple resources, examples & opportunities

Machine learning (ML) in Mechanics is a fascinating and timely topic. This article follows from a kind invitation to provide some thoughts about the use of ML algorithms to solve mechanics problems by overviewing my past and current research efforts along with students and collaborators in this field. A brief introduction on ML is initially provided for the colleagues not familiar with the topic, followed by a section about the usefulness of ML in Mechanics, and finally I will reflect on the challenges and opportunities in this field.


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