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UTARI Seminar

UTARI Seminar

UTARI Seminar is held the last Friday of each month at 12:00PM (noon). Each seminar highlights a different speaker who will discuss their latest research projects, cutting-edge technology or what is happening within certain technological industries. These industries include biomedical technologies or microsystems, assistive technologies, automation and intelligent systems, unmanned systems, advanced manufacturing and composite materials.


Speaker

Endel Iarve and Hari Adluru

Topic

Discrete Damage Modelling of Delamination Migration in Clamped Tapered Laminated Beam Specimens

Abstract

Laminated composite materials are used in stiffness critical applications and contain various stress concentration features such as holes and tapers. It is the interaction of different failure mechanisms in these materials, i.e., matrix cracking, delamination and fiber failure that determines the load carrying capacity of the structure and is computationally modeled in the present work. Clamped Tapered Beam Specimen (CTBS) designed by Advanced Composite Project Team at NASA LaRC is considered. This specimen allows studying the matrix crack initiation from pristine condition as well as delamination initiation and evolution including migration from one interface to another. Regularized eXtended Finite Element Method (Rx-FEM) is employed for analysis. The Rx FEM allows modeling the displacement discontinuity associated with individual matrix cracks in individual plies of a composite without regard to mesh orientation by inserting additional degrees of freedom in the process of the simulation. The propagation of the mesh independent crack is then performed by using Cohesive Zone Method (CZM). The simulation were performed simultaneously with experimental measurements conducted at NASA LaRC and showed good agreement with experimental data for ply level transverse strength parameter obtained by using three point bend test method, whereas the results obtained by using a lower value resulting from tensile testing of 90o coupons resulted in under-prediction of the peak load. The distance between the migration location and the load application point is consistent with experimental data.

Bio: Endel Larve

Endel Iarve has joined the newly established Institute of Predictive Performance Methodology at University of Texas at Arlington. His research focuses on discrete damage modeling methodologies for laminated composites under a broad range of loading conditions, including compression and fatigue. He also focuses on integrated computational materials science and engineering which brings together manufacturing and performance aspects of advanced composite materials.

Among his achievements, Iarve was awarded the Exceptional Performance Award and the Wohllenben/Hochwalt Professional awards from UDRI. Iarve also works in collaboration with the NASA Langly Research Center and the Skolkovo Institute of Technology in Moscow. He has been a speaker and panel participant at numerous national and international workshops and universities including UTA, SAMPE, the Conference on Composites Testing and Model Identification, the Conference of Advances in Multiscale Modeling of Composite Materials Systems and Components, the Strength and Prediction of Composite Bolted Joints and the Advisory Group for Aerospace Research & Development Structures and Materials Panel.

Iarve received his Ph.D. in mechanical engineering at St. Petersburg University in Russia. He received his M.S. and B.S. at Latvian State University, Latvia. Iarve’s recent position was as a professor for the School of Engineering where he also held the title of distinguished research engineer and group leader for Advanced Composites-Analytics at the University of Dayton Research Institute (UDRI).

Bio: Hari Adluru

Dr. Adluru is a post-doctoral researcher at University of Texas Arlington Research Institute (UTARI). He received his Ph.D. (2015) and M.S. (2004) in Mechanical Engineering from Florida International University. He received his Bachelor’s in Mechanical Engineering from Andhra University (India). In addition to his professional degrees, Dr. Adluru holds certifications in six-sigma green belt and Microsoft Project Professional.

Prior to joining UTARI, Dr. Adluru worked in both industry and academia. His academic experience includes diversified fields such as - strength and life predictions of composite materials, biomedical implantable devices such as retina implantable devices and hip implants, as well as micro heat exchangers in electronic packaging. He also worked as an Instructor while at FIU and as a full-time faculty in Manipal University at Udupi, India. His industrial experience spans areas including optimization of Heating Ventilation and Air Conditioning (HVAC) control systems for about a year and design and development of consumer electronics at Applica Consumer Products Inc. (Black & Decker) for over 5 years.




Date

Friday, October 27, 2017

Time

12pm (noon)-1pm

Location

7300 Jack Newell Boulevard South
Fort Worth, TX 76118-7115
817-272-5900
uta.edu/utari