Hamza, Ahmed A. Sokkar, Taha Z. N. El-Bakary, Mohammed A. Azzam, Amira A. S.
Published in
Journal of Polymer Engineering
The digital photoelastic technique is used to characterise the necking behaviour of isotactic polypropylene (iPP) fibres. The effect of stretching rate on necking initiation is studied. The birth of necking is observed using photoelastic patterns of the stretched fibres to understand how the localised difference between the principle stresses grows...
herráez-galindo, cristina torres-lagares, daniel martínez-gonzález, álvaro-josé pérez-velasco, andrea torres-carranza, eusebio serrera-figallo, maría-angeles gutiérrez-pérez, josé-luis
This study is a contribution to our understanding of the mechanical behaviour of dental implants through the use of the finite element and the photoelastic methods. Two internal connection and bone level dental implants with different design have been analysed (M-12 by Oxtein S.L., Zaragoza, Spain, and ASTRA, from Dentsply Sirona, Charlotte, NC, US...
May, Michael Mohrmann, Holger Nahme, Hartwig
The photoelastic effect was used to visualize and quantify stresses at the end of fibers embedded in birefringent epoxy resin. A method was proposed allowing not to only quantify the differences in main principal stress for a single loading state, but to allow monitoring the evolution of local stress throughout the micro-mechanical experiment. It w...
Zhao, Yiqiu Barés, Jonathan Zheng, Hu Bester, Cacey Stevens Xu, Yuanyuan Socolar, Joshua E. S. Behringer, Robert P.
Published in
Granular Matter
We investigate the jamming transition in a quasi-2D granular material composed of regular pentagons or disks subjected to quasistatic uniaxial compression. We report six major findings based on experiments with monodisperse photoelastic particles with static friction coefficient μ≈1\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasy...
Abed Zadeh, Aghil Barés, Jonathan Brzinski, Theodore A. Daniels, Karen E. Dijksman, Joshua Docquier, Nicolas Everitt, Henry O. Kollmer, Jonathan E. Lantsoght, Olivier Wang, Dong
...
Published in
Granular Matter
A photoelastic material will reveal its internal stresses when observed through polarizing filters. This eye-catching property has enlightened our understanding of granular materials for over half a century, whether in the service of art, education, or scientific research. In this review article in honor of Robert Behringer, we highlight both his p...
montalto, luigi natali, pier paolo scalise, lorenzo paone, nicola davì, fabrizio rinaldi, daniele barucca, gianni mengucci, paolo
Nowadays, radiation detectors based on scintillating crystals are used in many different fields of science like medicine, aerospace, high-energy physics, and security. The scintillating crystals are the core elements of these devices / by converting high-energy radiation into visible photons, they produce optical signals that can be detected and an...
Abed Zadeh, Aghil Barés, Jonathan Behringer, Robert P
Published in
Physical review. E
We study the local and global dynamics of sheared granular materials in a stick-slip experiment, using a slider and a spring. The system crackles, with intermittent slip avalanches, or exhibits irregular or periodic dynamics, depending on the shear rate and loading stiffness. The global force on the slider during shearing captures the transitions f...
Tarjányi, Norbert Uhričík, Milan Káčik, Daniel Palček, Peter
In the paper, we present the results of an investigation of polymethylmetacrylate’s birefringence induced due to applying high-load. The stress-induced birefringence of the polymethylmetacrylate samples was experimentally investigated by an apparatus combining an in-house made plane polariscope with a machine for fatigue testing of materials. A hal...
Mlinarič, Tilen
Mnogo strojev na svetu vsebuje zobnike, ki so v veliki večini narejeni iz jekla. Dandanes se na trg široke potrošnje prebijajo zobniki iz polimernih materialov, ki pa imajo svoje prednosti in slabosti. Z zobniki prenašamo moment preko majhne stične ploskve med dvema zoboma. Pri prenašanju obremenitve pride do raznih pojavov, npr. elastične deformac...
Frankovský, Peter Ostertag, Oskar Delyová, Ingrid
Published in
Strojnícky casopis – Journal of Mechanical Engineering
In the article we show the possibility of distorting the results of the experiment by photoelasticity path, in case the isochromatic fringe patterns are recorded by the camera. The recording of the color spectrum may be distorted by inappropriate selection of the recording medium, which is reflected by different types of aberrations. Transferring a...
