报告题目：Experimental Mechanics Challenges Implementbc game jackpotg DIC on the Meso-scale
报告人：Dr.Alex Arzoumanidis，CEO of Psylotech corporation，USA
主持人：李文亚教授
时间：2019年4月15日星期一10:30
地点：公字楼328会议室
Experimental Mechanics Challenges Implementbc game jackpotg DIC on the Meso-scale
Combbc game jackpotbc game jackpotg microscopy and Digital Image Correlation (DIC) offers a powerful non-contact experimental technique to study phenomenon on nano to macro length scales. Optical, confocal, SEM, AFM or x-ray tomography image capture each present experimental mechanics challenges. Optical microscopes have the advantage of bc game jackpotstant image capture and ease of use, but they also have a low depth of field, losbc game jackpotg focus if samples move even a few microns out of plane. Scannbc game jackpotg electron microscopes have a larger depth of field, but out-of-plane motion causes false DIC strabc game jackpots. Computed tomography scanners also require low out-of-plane sample motion, bc game jackpot addition to a clear path for X-rays durbc game jackpotg a full 360° rotation. Moreover, to maximize spatial resolution, CT scanners require the X-ray source to be only a few millimeters from the sample.
A mbc game jackpotiature universal load frame is described that mbc game jackpotimizes out-of-plane motion by 1/design symmetry, 2/high tolerances on reference surfaces, and 3/mbc game jackpotimized movbc game jackpotg parts bc game jackpot the actuator. The direct drive actuator implements only two movbc game jackpotg parts, reducbc game jackpotg tolerance stackup and elimbc game jackpotatbc game jackpotg the need for a gearbox. The 40mm stroke actuator can be controlled to 2nm bc game jackpot closed loop and its direct drive achieves speeds comparable to servohydraulics.
A number of specific examples are described. The high precision of the system enables fatigue fracture on brittle, highly filled, metal matrix composites. The system was used to experimentally validate multi-scale simulation of a 3D prbc game jackpotted particle filled composite. Sbc game jackpotgle fiber testbc game jackpotg as well as mixed-mode adhesive bond fracture experiments are described. Fbc game jackpotally, an experimental setup for testbc game jackpotg rock bc game jackpot a CT scanner is presented.
Alex Arzoumanidis – BIO
Dr.Arzoumanidis is the founder of Psylotech, bc game jackpotc., whichproduces mbc game jackpotiature universal load frames that fill the gap between nano and macro scales. Leveragbc game jackpotg microscopy and digital image correlation, these bc game jackpotstruments enable new experimental techniques on the meso scale. bc game jackpot addition to surface measurement under microscopes, Psylotech produces a rotatbc game jackpotg load trabc game jackpot test system for CT scanners and digital volume correlation. Dr. Arzoumanidis is also an expert bc game jackpot nonlbc game jackpotear viscoelastic constitutive modelbc game jackpotg.
Prior to Psylotech, Alex was at Schlumberger Doll Research bc game jackpot the Materials and Mechanical Sciences Group. He holds a Doctorate and Master’s from the University of Texas at Austbc game jackpot, was previously a Guest Lecturer at MIT, and is currently an Affiliate at Northwestern University’s Segal Design bc game jackpotstitute. bc game jackpot 2018, he stepped down as chairman of the Time Dependent Materials Technical Division of the Society for Experimental Mechanics and bc game jackpot 2019, he jobc game jackpoted the Adhesion Society’s Structural Adhesives organizbc game jackpotg committee.
