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1 COMUNICAÇÃO TÉCNICA Nº Dynamic study of CFRP composite Daniel Almeida Pereira Palestra apresentada no Simceter Users Meeting South America, 2018, São Paulo. A série Comunicação Técnica compreende trabalhos elaborados por técnicos do IPT, apresentados em eventos, publicados em revistas especializadas ou quando seu conteúdo apresentar relevância pública. Instituto de Pesquisas Tecnológicas do Estado de São Paulo S/A - IPT Av. Prof. Almeida Prado, 532 Cidade Universitária ou Caixa Postal 0141 CEP São Paulo SP Brasil CEP Tel /4000 Fax

2 Dynamic study of CFRP Composite MSc Daniel A. Pereira PhD candidate at Technological Institute of Aeronautics - ITA Research at Institute for Technological Research - IPT

3 Introduction

4 Carbon fiber composites Composites: Consist of two or more separate materials combined in a structural unit, are typically made from various combinations of the other three materials. The most common example is the fibrous composite consisting of reinforcing fibers embedded in a binder or matrix material. (Ref.: Gibson (2016)) Page 3

5 Multifunctional Composites Structures that simultaneously perform: Multiple structural functions: High Strength, High Stiffness, High Damping Combined nonstructural and structural functions Sensing and actuation, Morphing capability, Self-healing Page 4

6 Technology Readiness Level Know-how TRL 6-9 Know-why TRL 4-6 TRL 2-4 TRL 1-2 Ref.: Marlet, J. M. F (2017) Ref.: Nasa (1995) Page 5

7 Objective

8 High Damping Composite Materials Constant Stiffness Composite Laminates (VSCL) Variable Stiffness Composite Laminates (VSCL) Ref.: Ribeiro et al. (2014) Page 7

9 Variable Stiffness composite Laminate Natural frequencies and mode shapes Avoid stress concentrations Improve buckling resistance (a) Simulation (b) Experiment Ref.: Lopes et al. (2010) Improve aeroelastic stability Ref.: Web Page 8

10 Methodology

11 High damping composite materials Variable stiffness composite laminates (VSCL) Tow Steering Consists in laminates having variable fiber angles in each layer. This provides the designer with more tailoring options to design composite plates concerning multi-objective optimization problems. Page 10

12 Laboratório de Dinâmica e Estruturas Inteligientes (ITA) LMS Test.Lab LMS SCADAS Mobile Page 11

13 Laboratório de Estruturas Leves (IPT) Page 12

14 Results

15 Manufacturing Process T 0 = 51 and T 1 = 20 0 o /90 o /90 o /90 o /90 o /0 o Page 14

16 Automated Fiber Placement (AFP) Page 15

17 Experimental Test Rig Page 16

18 LMS SCADAS and Test.Lab Test.Lab 17 Structures Acquisition Spectral Testing Time MDOF Page 17

19 LMS SCADAS and Test.Lab Test.Lab 17 Structures Acquisition Spectral Testing Time MDOF Page 18

20 LMS SCADAS and Test.Lab Test.Lab 17 Structures Acquisition Spectral Testing Time MDOF Page 19

21 LMS SCADAS and Test.Lab Test.Lab 17 Structures Acquisition Spectral Testing Time MDOF Page 20

22 LMS SCADAS Structures that simultaneously perform: Experimental Results Numerical Results Page 21

23 Numerical Results CSCL lay up 0, 90, 90 s VSCL lay up < 50, 20 >, < 40,70 >, < 40,70 > s Page 22

24 Conclusions Highlights: Production of Tow Steered composite plates with AFP VSCL as proof of concept Modal analysis using LMS SCADAS and Test.Lab Assessment on the influence of damping, natural frequency and modal shapes of composite plates Page 23

25 References 1. Gibson, Ronald F. Principles of composite material mechanics. CRC press, Mankins, John C. (6 April 1995). "Technology Readiness Levels: A White Paper" (PDF). NASA, Office of Space Access and Technology, Advanced Concepts Office. 3. Marlet, J. M. F., 2017, R&D for new materials and related processes Ribeiro, Pedro, et al. "A review on the mechanical behaviour of curvilinear fibre composite laminated panels." Journal of Composite Materials (2014): LOPES, C. S.; GÜRDAL, Z.; CAMANHO, P. P. Tailoring for strength of composite steered-fibre panels with cutouts. Composites Part A: Applied Science and Manufacturing, v. 41, n. 12, p , Page 24

26 Thank you.

27 Daniel A. Pereira