This paper presents an investigation into the influence of laser drilling on the tensile strength of carbon fiber reinforced plastic (CFRP) laminates of 1 and 2.5 mm thickness. The CFRP laminates were drilled using the microsecond laser, nanosecond laser, and picosecond laser, and the heat-affected zone (HAZ) was characterized and measured by optical microscopy. Through setting laser parameters, specimens with different HAZs were prepared, and then tensile strength tests were conducted. The results indicate that the tensile strength linearly depends on the width of HAZ. The tensile strengths of 1 mm specimens decrease by approximately 122 MPa/mm HAZ, and 2.5 mm specimens decrease by approximately 33.9 MPa/mm HAZ. Comparing the results of different thicknesses of CFRP, the effect of HAZ on tensile strength would be weakened with the increasing of laminate’s thickness. Actually, besides HAZ, cutting-induced geometric defects also seriously influence tensile strength, because of the stress concentration around these defects during the stretching process. Additionally, the mechanism why the HAZ influences tensile strength was revealed visually through FEM simulation: the resin matrix damage within HAZ causes the tensile loads not be transferred effectively between the fibers and then weakens the strength. It was the first time the underlined mechanism is revealed for HAZ-inducing strength reduction through FEM simulation. The laser machining method is more suitable for processing the thicker CFRP composites because the negative effect of HAZ is weakened for the thicker material.
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November 2020
Research Article|
October 07 2020
Factors influencing the tensile strength of carbon fiber reinforced plastic laminates for laser machining method and the underlined mechanisms
Yunxia Ye
;
Yunxia Ye
a)
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
2
Institute of Micro-Nano Optoelectronics and Terahertz Technology, Jiangsu University
, Zhenjiang 212013, People's Republic of China
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
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Tingting Du;
Tingting Du
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
2
Institute of Micro-Nano Optoelectronics and Terahertz Technology, Jiangsu University
, Zhenjiang 212013, People's Republic of China
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Haonan Li;
Haonan Li
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
2
Institute of Micro-Nano Optoelectronics and Terahertz Technology, Jiangsu University
, Zhenjiang 212013, People's Republic of China
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Xudong Ren;
Xudong Ren
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
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Haijuan Kong;
Haijuan Kong
3
School of Material Science and Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People's Republic of China
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Naifei Ren
Naifei Ren
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
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Yunxia Ye
1,2,a)
Tingting Du
1,2
Haonan Li
1,2
Xudong Ren
1
Haijuan Kong
3
Naifei Ren
1
1
School of Mechanical Engineering, Jiangsu University
, Zhenjiang 212013, People's Republic of China
2
Institute of Micro-Nano Optoelectronics and Terahertz Technology, Jiangsu University
, Zhenjiang 212013, People's Republic of China
3
School of Material Science and Engineering, Shanghai University of Engineering Science
, Shanghai 201600, People's Republic of China
a)Author to whom correspondence should be addressed; electronic mail: [email protected]
J. Laser Appl. 32, 042011 (2020)
Article history
Received:
June 10 2020
Accepted:
September 28 2020
Citation
Yunxia Ye, Tingting Du, Haonan Li, Xudong Ren, Haijuan Kong, Naifei Ren; Factors influencing the tensile strength of carbon fiber reinforced plastic laminates for laser machining method and the underlined mechanisms. J. Laser Appl. 1 November 2020; 32 (4): 042011. https://doi.org/10.2351/7.0000178
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