Understanding the self-limiting effect in picosecond laser single and multiple parallel pass drilling/machining of CFRP composite and mild steel

Salama, Adel; Yan, Yinzhou; Li, Lin; Mativenga, Paul; Whitehead, David; Sabli, Ahmad Syamaizar Bin Ahmad

doi:10.1016/j.matdes.2016.06.048

Cited by 40 publications

(19 citation statements)

References 16 publications

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“…Even though power and the number of loops were increased up to 37 W and 100 loops, all the cases seemed to be unable to cut completely. In addition, we tried to move down the focal plane on the z-axis with reference to previous research articles [ 23 , 24 ]. However, complete cutting with single-pass processing required a very long processing time due to a narrow kerf width from the small beam size.…”

Section: Resultsmentioning

confidence: 99%

“…A picosecond laser can be used to process materials with relatively less influence on the heat-affected zone (HAZ) than nanosecond and CW laser machining [ 22 , 28 ]. In addition, many researchers have made an effort to improve cutting quality and decrease processing time by studying how kerf width, ablation depth, taper angle, edge quality, HAZ, and thickness influence CFRP [ 23 , 24 , 25 , 26 , 27 ]. Multiple parallel pass and multi-ring processing methods have been introduced as effective machining strategies [ 23 , 24 , 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, many researchers have made an effort to improve cutting quality and decrease processing time by studying how kerf width, ablation depth, taper angle, edge quality, HAZ, and thickness influence CFRP [ 23 , 24 , 25 , 26 , 27 ]. Multiple parallel pass and multi-ring processing methods have been introduced as effective machining strategies [ 23 , 24 , 29 , 30 ]. An increase in scan speed, causing a decrease in beam overlap, was shown to reduce ablation depth [ 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

“…Multiple parallel pass and multi-ring processing methods have been introduced as effective machining strategies [ 23 , 24 , 29 , 30 ]. An increase in scan speed, causing a decrease in beam overlap, was shown to reduce ablation depth [ 23 , 24 ]. Although, many studies using laser processing for industrial applications of CFRP have been reported, most experimental works have focused on the machining of thermoset CFRP using infrared laser wavelength.…”

Section: Introductionmentioning

confidence: 99%

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Green Picosecond Laser Machining of Thermoset and Thermoplastic Carbon Fiber Reinforced Polymers

et al. 2021

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There has been an increase in demand for the development of lightweight and high-strength materials for applications in the transportation industry. Carbon fiber reinforced polymer (CFRP) is known as one of the most promising materials owing to its high strength-to-weight ratio. To apply CFRP in the automotive industry, various machining technologies have been reported because it is difficult to machine. Among these technologies, picosecond laser beam-induced machining has attracted great interest because it provides negligible heat transfer and can avoid tool wear. In this work, we conducted and compared machining of 2.15 mm-thick thermoset and 1.85 mm-thick thermoplastic CFRPs by using a green picosecond laser. The optimized experimental conditions for drilling with a diameter of 7 mm led to a small taper angle (average ~ 3.5°). The tensile strength of the laser-drilled specimens was evaluated, and the average value was 570 MPa. Our study indicates that green picosecond laser processing should be considered as a promising option for the machining of CFRP with a small taper angle.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Green Picosecond Laser Machining of Thermoset and Thermoplastic Carbon Fiber Reinforced Polymers

et al. 2021

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“…They got the conclusion that double-pass laser beam produced better surface appearance. Multi-pass laser beam was proved an effective method to improve the surface quality; 11,15,16 however, the thermal damage still could not be avoided.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of water jet–guided laser cutting of carbon fiber–reinforced plastics

Sun

Han

Ying

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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Carbon fiber–reinforced plastics are now widely used in various industries because of its excellent properties. Although milling and drilling are the dominating processing methods for carbon fiber–reinforced plastics at present, laser beam machining, as a wear-free, contactless and flexible process, is considered a promising alternative method. However, the thermal damage is one of the most important issues for laser beam machining of carbon fiber–reinforced plastics because of the significant difference in thermal properties of carbon fiber and matrix. Water jet–guided laser technique has been proved an effective technique to reduce heat damage. Nevertheless, there are few studies about carbon fiber–reinforced plastics processing with water jet–guided laser to date. It is important to understand the mechanism of interaction between water jet–guided laser and carbon fiber–reinforced plastics. Hence, a three-dimensional finite element model was developed to investigate the transient thermal process. The influence of scanning speed on the surface appearance, heat-affected zone and shape of the cross section was illustrated. Experiments with same process parameters were conducted to validate the model. Based on the finite element model and experiments, the mechanism of material removal was explained. The epoxy is considered to be removed once it reaches the melting point and the carbon fiber is removed at the sublimation temperature. Because of the strong cooling effect of water jet, there is nearly no heat accumulation between pulses, leading to the constant heat-affected zone width at different scanning speed. The kerf sidewall is relatively vertical due to the homogeneous power distribution in water jet. The results demonstrate that water jet–guided laser cutting of carbon fiber–reinforced plastics has some advantages than traditional laser beam machining and is a potential processing method for carbon fiber–reinforced plastics.

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Laser beam machining of carbon fiber reinforced composites: a review

El-Hofy

2018

Int J Adv Manuf Technol

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Understanding the self-limiting effect in picosecond laser single and multiple parallel pass drilling/machining of CFRP composite and mild steel

Cited by 40 publications

References 16 publications

Green Picosecond Laser Machining of Thermoset and Thermoplastic Carbon Fiber Reinforced Polymers

Green Picosecond Laser Machining of Thermoset and Thermoplastic Carbon Fiber Reinforced Polymers

Numerical simulation of water jet–guided laser cutting of carbon fiber–reinforced plastics

Laser beam machining of carbon fiber reinforced composites: a review

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