PSI - Issue 17

Available online at www.sciencedirect.com Structural Int grity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 971–978

ICSI 2019 The 3rd International Conference on Structural Integrity Identification of material properties of a laminated plate from measurements of natural frequencies and modal rotations H. Lopes a, *, J. V. Araújo dos Santos b , A. Katunin c a DEM-ISEP, Instituto Politecnico do Porto, Porto, Portugal b IDMEC, Instituto Superior Tecnico, Universidade de Lisboa, Lisboa, Portugal c Institute of Fundamentals of Machinery Design, Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice, Poland ICSI 2019 The 3rd International Conference on Structural Integrity Identification of material properties of a laminated plate from measurements of natural frequencies and modal rotations H. Lopes a, *, J. V. Araújo dos Santos b , A. Katunin c a DEM-ISEP, Instituto Politec co do Porto, Port , Portug l b IDMEC, Instituto Superior Tecni o, Universidade de Lisboa, Lisboa, Portugal c Institute of Fundamentals of Machinery Design, Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice, Poland

Abstract Abstract

This paper presents a method for identification of material constants of a laminated composite plate. An optimization problem, with an objective function relating experimental and numerical natural frequencies, is formulated and solved. Three optimization algorithms were applied in this study for comparison purposes: (1) particle swarm, (2) genetic, and (3) pattern search algorithms. The identified material constants were validated by comparing modal rotations measured with shearography with those computed by finite element analysis. This paper presents a method for identification of material constants of a laminated composit plate. An optimizati n problem, with an objective function relating experimental and numerical natur l frequencies, is formulated and solved. Three optimization algorithms were applied i this study for comparison purposes: (1) particle swarm, (2) genetic, and (3) pattern search algorithms. The identified material constants were validated by comparing modal rotations measured with shearography with those computed by finite element analysis.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: material properties; laminated composite plate; natural frequencies; modal rotations; shaerography; optimization Keywords: material properties; laminated composite plate; natural frequencies; modal rotations; shaerography; optimization

1. Introduction 1. Introduction

Polymer reinforced composites are of growing importance in the modern industry, especially the industries of transport, like aircraft and aerospace, automotive, naval etc., due to their superior mechanical properties and lightweightness. Following this, the evaluation of material properties of these composites is an important step during the design of structures. A standard procedure of determination of material properties requires performing quasi-static Polymer reinforced composites are of growing importance in the modern industry, especially the industries of transport, like aircraft and aerospace, automotive, naval etc., due to their superior mechanical properties and lightweightness. Following this, the evaluation of material properties of these composites is an important step during the design of structures. A standard procedure of determination of material properties requires performing quasi-static

* Corresponding author. Tel.: +0-351-22-834-0500; fax: +0-351-22-832-1159. E-mail address: hml@isep.ipp.pt * Correspon ing author. T l.: +0-351-22-834-0500; fax: +0-351-22-832-1159. E-mail address: hml@isep.ipp.pt

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.129