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

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Procedia Structural Integrity 17 (2019) 292–299

ICSI 2019 The 3rd International Conference on Structural Integrity Notch Tensile Strength of Carbon Fiber/Epoxy Composite Plate with a Center Hole under Static and Cyclic Loading Waleed H. Alhazmi 1 , Amr A. Abd-Elhady 1,3 , Saeed Mousa 1, *, M. Atta 2 , A. Abu-Sinna 4 , O. Bafakeeh 1 , H.E.M. Sallam 1,5 1 Faculty of Engineering, Jazan University, Jazan 706, KSA. ICSI 2019 The 3rd International Conference on Structural Integrity Notch Tensile Str ngth of Carbon F ber/Epoxy Composite Plate with a Center Hole under Static and Cyclic Loading Waleed H. Alhazmi 1 , Amr A. Abd-Elhady 1,3 , Saeed Mousa 1, *, M. Atta 2 , A. Abu-Sinna 4 , O. Bafakeeh 1 , H.E.M. Sallam 1,5 1 Faculty of Engineering, Jazan University, Jazan 706, KSA. The tensile and fatigue properties of epoxy reinforced with 68 volume percent carbon fiber, CFRP, have been fully investigated. The effect of the presence of an open circular hole on tensile, fatigue residual strength, and fatigue strength of CFRP plates was studied experimentally and numerically. The results of pin bearing, i.e. bolt-loaded holes, tests were also investigated and evaluated. A three-dimensional orthotropic-elastic finite element code was developed to calculate the stress concentration factors of open circular holes or bolt-loaded holes in composite materials. The modulus of elasticity, tensile strength, and maximum elongation of CFRP are approximately equal to the values found in the technical data sheet of the supplier. A rule of mixtures type relation is adequate to predict the modulus of elasticity of such CFRP plate. This may be attributed to the high mechanical properties and high volumetric content of the fibers compared with the matrix, i.e. there is a marginal contribution of the strength of the matrix or the fiber-matrix interfacial bond strength. Based on the net stress analysis, there is no difference between the mechanical behavior of smooth and open-holed specimens, i.e. notch insensitivity. This is due to the incapability of the matrix to transfer the load from the discontinuous part. The same behavior was also found under cyclic loading. Due to the weakness in the bond between the fiber and matrix or in the shear strength of the matrix compared with the tensile strength of the fiber, the failure mode of all tested bolt-loaded unidirectional CFRP plates is shear-out. Further, the strength of such bolted joints is mainly dependent on the size of the contact area between the hole and the bolt. The tensile and fatigue properties of epoxy reinforced with 68 volume percent carbon fiber, CFRP, have been fully investigated. The effect of the presence f an open circular hole on tensile, fatigue residual strength, and fatigue strength f CFRP plates was studied experimentally and numerically. The results of pin bearing, i.e. bolt-loaded holes, tests were also investigated and evaluated. A three-dimensional orthotropic-elastic finite element c de was developed to calculate the stress concentratio factors of open circular holes or bolt-loaded holes in composite materials. The modulus of elasticity, tensile strength, and maximum elongatio of CFRP are approximately equal to the values found in t e technical data sheet of the supplier. A rule of mixtures type relation is adequate to predict the modulus f elasticity of such CFRP plate. This ma be attributed to the high mechanical properties and high volumetric content of the fibers co pared with the matrix, i.e. there is a marginal contribution of the strength of the matrix or the fiber-matrix interfacial bond strength. Based on the net stress analysis, there is no difference betwee the mechanical behavior of smooth and open-holed specimens, i.e. notch insensitivity. This is due to the incapability of t e matrix to transfer the load from the discontinuous part. The same behavior was also found under cyclic loading. Due to the weakness in the bond between the fiber and matrix or in the shear strength of t e matrix compared with the tensile strength of the fiber, the failure mode of all tested bolt-loaded unidirectional CFRP plates is shear-out. Further, the strength of such bolted joints is mainly dependent on the size of the contact area between the hole and the bolt. Abstract 2Mechanical Design and Prod. Eng. Dept., Zagazig University, Zagazig, Egypt 3 Mech. Design Dept., Faculty of Eng., Helwan University, Cairo 11718, Egypt 4Force and Material Metrology Dept., National Inst. Standards, Giza 136, Egypt 5 Materials Engineering Department, Zagazig University, Zagazig, Egypt * Contact author: samousa@jazanu.edu.sa 2Mech ical D sign and Prod. Eng. Dept., Z gazig University, Zagazig, Egypt 3 Mech. Design Dept., Faculty of Eng., Helw n University, Cairo 11718, Egypt 4Force and Material Metrology Dept., National Inst. Standards, Giza 136, Egypt 5 Materials Engineering Department, Zagazig University, Zagazig, Egypt * Contact author: samousa@jazanu.edu.sa Abstract

© 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 under respo sibility of the ICSI 2019 organizers. Keywords: CFRP; fatigue; notch sensitivity; 3-D orthotropic-elastic finite element; Pin bearing test.

Keywords: CFRP; fatigue; notch sensitivity; 3-D orthotropic-elastic finite element; Pin bearing test.

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.2019.08.039