PSI - Issue 17

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

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 17 (2019) 284–291

ICSI 2019 The 3rd International Conference on Structural Integrity Mixed Mode Crack Growth in Functionally Graded Material Under Three-Point Bending S. Mousa 1* , A.A. Abd-Elhady 2 , A. Abu-Sinna 3 , T. Enab 4 , W.H. Alhazmi 1 , H. Sallam 5 ICSI 2019 The 3rd International Conference on Structural Integrity Mixed Mode Crack Growth in Fu ctio ally Graded Material Under Three-Point Bending S. Mousa 1* , A.A. Abd-Elhady 2 , A. Abu-Sinna 3 , T. Enab 4 , W.H. Alhazmi 1 , H. Sallam 5

1 Faculty of Engineering, Jazan University, Jazan 706, Kingdom of Saudi Arabia, 2 Mechanical Design Dept., Faculty of Engineering, Helwan University, Cairo 11718, Egypt 3 Force and Material Metrology Dept., National Institute for Standards, Giza 136, Egypt 4 Faculty of Engineering, Mansoura University P.O. 35516 Mansoura, Egypt. 5 Materials Engineering Department, Zagazig University, Zagazig, Egypt * Contact author: samousa@jazanu.edu.sa 1 Faculty of Engineering, Jazan University, Jazan 706, Kingdom of Saudi Arabia, 2 Mechanical Design Dept., Faculty of Engineering, Helwan University, Cairo 11718, Egypt 3 Force and Material Metrology t., National Institute for Stand rds, Giza 136, Egypt 4 Faculty of Engineeri g, M ns ura University P.O. 35516 Mansoura, Egypt. 5 Materials Engineering Department, Zagazig University, Zagazig, Egypt * Contact author: samousa@jazanu.edu.sa

Abstract

Abstract

Functionally graded materials, FGM, permit tailoring the material volume fractions to extract maximum benefit from their in homogeneity. Such materials offer great potential for components, which operate under severe thermal or mechanical loadings, such as spacecraft heat shields, plasma facings for fusion reactors, crucial jet fighter structures and engine components. In the present work, polyester matrix reinforced by varying glass fiber distribution was used to obtain FGM polymeric composites. The hand lay-up technique was adopted to manufacture the FGM. The mixed mode crack path of glass fiber/polyester FGM under three point bend, 3PB, was observed. The mechanical properties, such as tensile and flexural strength were determined experimentally and numerically. Pre-cracks with different lengths and locations with seven different inclination angles were considered to study the mixed mode crack growth of FGM. For the same crack length, the present results showed that the maximum applied load increased with increasing the crack inclination angle, i.e. the mode of mixity increased to reach pure mode II. Generally, the crack path initiated from the original inclination angle and grew along a curvilinear trajectory to extend toward the upper loading point. Functionally graded materials, FGM, permit tailoring the material volume fractions to extract maximum benefit from their in homogeneity. Such materials offer great potential for components, which operate under severe thermal or mechanical loadings, such as spacecraft heat shields, plasma facings for fusion reactors, crucial jet fighter structures and engine components. In the present work, polyester matrix reinforced by varying glass fiber distribution was used to obtain FGM polymeric composites. The hand lay-up tech ique was adopted to manufacture the FGM. The mixed mode crack path of glass fiber/polyester FGM under three point bend, 3PB, was observed. The mechanical properties, such as tensile and flexural strength were determined experimentally and numerically. Pre-cracks with different le gths and locations with seven different i clination angles were considered to study the mixed mode crack growth of FGM. For the same crack length, the present results showed that the maximum applied load increased with increasing the crack inclination angle, i.e. the mode of mixity increased to reach pure mode II. Generally, the crack path initiated from the original inclination angle and grew along a curvilinear trajectory to extend toward the upper loading point.

© 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. P er-review un er responsibility of the ICSI 2019 organizers.

Keywords: Mixed Mode I/II; Crack Initiation Angle; Crack Growth Path; Functionally graded material - FGM.

Keywords: Mixed Mode I/II; Crack Initiation Angle; Crack Growth Path; Functionally graded material - FGM.

1. Introduction A composition of several different materials is often used in structural components in order to improve the responses of structures subjected to for example thermal and mechanical loads. To achieve this purpose, functionally graded 1. Introduction A composition of several different materials is often used in structural components in order to improve the responses of structures subjected to for example thermal and mechanical loads. To achieve this purpose, functionally graded

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.2019.08.038