Blog posts
Flower Inspiration: Broad-angle Structural Color through Tunable Hierarchical Wrinkles in Thin Film Multilayers
Dear colleagues, we have our recent paper, Flower Inspiration: Broad-angle Structural Color through Tunable Hierarchical Wrinkles in Thin Film Multilayers, published on Advanced Functional Materials. The cuticular nano-ridges on certain flower petals can selectively display broad-angle iridescence to enhance pollinators’ foraging efficiency. This paper develops a tunable broad-angle diffracting surface based on hierarchical wrinkling composites.
Numerical and experimental analysis of the bi-stable state for frictional continuous system
Friction induced vibrations are a very well known problem in engineering applications. Sometimes they are referred to be unpredictable, intermittent, capricious (!!!) and particularly experimentalists know this very well. Here, by means of numerical simulations and experimental measurements, we highlight how capriciousness may arise from the multistable behavior of frictional systems, i.e. their characteristic to show multiple stable solutions for the same set of governing parameters. Hence initial conditions and perturbations become crucial.
How contact area decreases under shear load in soft bodies?
A very good paper has just been published in JMPS by J.C. Mergel, J. Scheibert, R.A. Sauer "Contact with coupled adhesion and friction: Computational framework, applications, and new insights". it shows the results of numerical simulations with soft bodies sheared by a tangential force. There is a vivacious discussion in Literature if the contact area reduces due to adhesion or due to large deformation.
keep reading-21
Processing, structure and properties of polyacrylonitrile fibers with 15 weight percent single wall carbon nanotubes, Arias-Monje, Lu, Ramachandran, Kirmani, Kumar, Polymer, 2020
Novelty/impact/significance:
Two funded PhD positions at the University of Western Ontario, Canada.
We have two funded PhD positions and we are looking for talented, self-motivated, and enthusiastic students with a BSc or MSc degree in mechanical or materials engineering. Students with strong background in crystal plasticity and computational mechanics are recommended to apply.
Prospective candidates will be assessed based on how well they meet the following criteria:
Invitation to attend Mr. Ran Tao PhD defense at COHMAS lab, KAUST.
Title:
Enhancing the bonding of CFRP adhesive bonding through laser-based surface preperation sterategies.
Abstract:
Carbon Fiber-Reinforced Polymers (CFRPs) have been widely applied in the aerospace and automotive industries to achieve unprecedented weight reductions. However, major challenges need to be solved in order to exploit their full potential, especially in the design of full composite primary structure, making then a vital part of the mobility and energy revolution.
Microscopic and Long-wave instabilities in soft fiber composites
Dear Colleagues,
Our paper on elastic instabilities in soft fiber composites recently got published in International Journal of Engineering Science. In this paper, we explore how the stiffening behavior of composites phases influences the development of instabilities and associated buckling patterns. To do that, we use non-Gaussian hyperleastic model to define the constitutive behavior of phases.
A finite element formuation for a direct approach to elastoplasticity in special Cosserat rods
A finite element formulation is presented for a direct approach to model elastoplastic deformation in slender bodies using the special Cosserat rod theory. The direct theory has additional plastic strain and hardening variables, which are functions of just the rod's arc-length, to account for plastic deformation of the rod. Furthermore, the theory assumes the existence of an effective yield function in terms of stress resultants, i.e., force and moment in the cross-section and cross-section averaged hardening parameters.
Prospective book by Elsevier on quality of AM metals (Invitation to contribute)
Dear All
I hope you are doing well and staying healthy.
I’m writing to you in light of the exciting news that myself and my colleagues Siegfried Schmauder and Felix Sajadi are in the process of editing a multi-contributed book on the topic of "Quality Analysis of Additive Manufactured Metals" to be published by Elsevier in 2022.