Influence of pulse repetition rate on percussion drilling of Ti-based alloy by picosecond laser pulses

Kononenko, T. V.; Freitag, Christian; Sovyk, D. N.; Lukhter, A. B.; Skvortsov, K. V.; Konov, V. I.

doi:10.1016/j.optlaseng.2017.12.003

Cited by 31 publications

(13 citation statements)

References 23 publications

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“…Previously, Marimuthu et al [ 52 ] investigated the effects of pulse duration, energy, frequency, and laser assisted gas composition on the characteristics of laser drilled holes. Kononenko et al [ 53 ] also investigated the influence of laser pulses on the percussion drilling process, during which a dramatic rise of the recast layer thickness inside the drilled hole was observed.…”

Section: Experimental Samplesmentioning

confidence: 99%

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

2021

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Particularly in the aerospace industry and its applications, recast layers and microcracks in base materials are considered to be undesirable side effects of the laser beam machining process, and can have a significant influence on the resulting material behavior and its properties. The paper deals with the evaluation of the affected areas of the Inconel 718 nickel-base superalloy after its drilling by a laser beam. In addition, measurements and analyses of the mechanical properties were performed to investigate how these material properties were affected. It is supposed that the mechanical properties of the base material will be negatively affected by this accompanying machining process phenomenon. As a verification method of the final mechanical properties of the material, static uniaxial tension tests were performed on experimental flat shape samples made of the same material (Inconel 718) and three different thicknesses (0.5/1.0/1.6 mm) which best represented the practical needs of aerospace sheet metal applications. There was one hole that was drilled with an angle of under 70° in the middle of the sample length. Additionally, there were several sets of samples for each material thickness that were drilled by both conventional and nonconventional methods to emphasize the effect of the recast layer on the base material. In total, 192 samples were evaluated within the experiment. Moreover, different tensile testing temperatures (room as 23 °C and elevated as 550 °C) were determined for all the circumstances of the individual experiments to simulate real operation load material behavior. As a result, the dependencies between the amount of the recast layer and the length of the microcracks observed after the material was machined by laser beam, and the decrease in the mechanical properties of the base material, were determined.

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Section: Experimental Samplesmentioning

confidence: 99%

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

2021

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“…Figure 7 further reveals that the range, where highquality exits are formed, can be increased by increasing the peak fluence of the incident Gaussian beam. However, it must be taken into account that when the peak fluence is increased to beyond 10 J/cm 2 , intensity-dependent effects such as plasma formation and air breakthrough [32,33] or heat accumulation effects may occur [13,34], which can lead to altered ablation and drilling progress.…”

Section: Experimental Verificationmentioning

confidence: 99%

High-quality percussion drilling with ultrashort laser pulses

et al. 2021

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The influence of the laser fluence on the quality of percussion-drilled holes was investigated both experimentally and by an analytical model. The study reveals that the edge quality of the drilled microholes depends on the laser fluence reaching the rear exit of the hole and changes with the number of pulses applied after breakthrough. The minimum fluence that must reach the hole’s exit in order to obtain high-quality microholes in stainless steel was experimentally found to be 2.8 times the ablation threshold.

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“…17,18 The impressive characteristics of this method are accuracy and unlimited accessibility to the vast range of materials such as metals, polymers, and ceramics. [19][20][21] Polymeric materials are widely used in scaffold fabrication for various reasons: its stable porous structure, load bearing ability, and its low cost versus to the other material. 22,23 Poly(methyl methacrylate) (PMMA) and its derivatives, which have been successfully used in orthopedic surgeries, have some interesting characteristics such as processability, biocompatibility, and low cost which are promising for bone substitute applications.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of polymethyl methacrylate scaffolds for bone tissue engineering

Shirzad

Matbouei

Fathi

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part L:

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A controversial issue in tissue engineering is the development of new methods to fabricate scaffolds that precisely imitate the structure and function of the extracellular matrix. The objective of this study is to propose a new method in scaffold fabrication and investigate the effects of pore topology, particularly gradient structure, on the mechanical properties of the scaffolds. In this regard, poly(methyl methacrylate) sheets constructing the scaffold's substructures were cut by laser and then stacked on each other. Experimental and numerical methods were utilized to evaluate the mechanical properties of the square and circular scaffolds. The results demonstrate that this method has the ability to fabricate interconnected pores with the controllability on their design. It can also give accurate mechanical properties, especially gradient structure eliminating the weaknesses of simple structures. Moreover, a comparison between the scaffolds showed that opting an appropriate structure can lead to a higher porosity with preferable mechanical properties.

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Influence of pulse repetition rate on percussion drilling of Ti-based alloy by picosecond laser pulses

Cited by 31 publications

References 23 publications

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

Laser Beam Drilling of Inconel 718 and Its Effect on Mechanical Properties Determined by Static Uniaxial Tensile Testing at Room and Elevated Temperatures

High-quality percussion drilling with ultrashort laser pulses

Experimental and numerical investigation of polymethyl methacrylate scaffolds for bone tissue engineering

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