Statistical characteristics of surface integrity by fiber laser cutting of Nitinol vascular stents

Fu, C. H.; Liu, J.F.; Guo, Andrew

doi:10.1016/j.apsusc.2015.06.105

Cited by 39 publications

(18 citation statements)

References 23 publications

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“…The machinability is defined by an absorption capacity, reflectance and thermal conductivity of material [26,27]. It is possible to machine various types of metals [23,28], ceramics [29], glass [30], semiconductor materials [31], polymers [32], diamond [33], mineral and composite materials [34][35][36][37], as well as a biocompatible materials [38,39] and biomaterials (hydroxyapatite, bones and tissues) [40].…”

Section: Introductionmentioning

confidence: 99%

Laser surface texturing of tool steel: textured surfaces quality evaluation

2016

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Abstract:In this experimental investigation the laser surface texturing of tool steel of type 90MnCrV8 has been conducted. The 5-axis highly dynamic laser precision machining centre Lasertec 80 Shape equipped with the nano-second pulsed ytterbium fibre laser and CNC system Siemens 840 D was used. The planar and spherical surfaces first prepared by turning have been textured. The regular array of spherical and ellipsoidal dimples with a different dimensions and different surface density has been created. Laser surface texturing has been realized under different combinations of process parameters: pulse frequency, pulse energy and laser beam scanning speed. The morphological characterization of ablated surfaces has been performed using scanning electron microscopy (SEM) technique. The results show limited possibility of ns pulse fibre laser application to generate different surface structures for tribological modification of metallic materials. These structures were obtained by varying the processing conditions between surface ablation, to surface remelting. In all cases the areas of molten material and re-cast layers were observed on the bottom and walls of the dimples. Beside the influence of laser beam parameters on the machined surface quality during laser machining of regular hemispherical and elipsoidal dimple texture on parabolic and hemispherical surfaces has been studied.

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Section: Introductionmentioning

confidence: 99%

Laser surface texturing of tool steel: textured surfaces quality evaluation

2016

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“…Noting that the energy absorbed by the surface after time, t, by the laser is, E = IAt, after manipulation of Eqs. (4), (5), and (7) from Cohen's analysis we find, the specific energy required to melt material E melt_theory is given by Eq. (15) and presented with E melt_exp in Fig.…”

Section: Effect Of Melting Without Ejectionmentioning

confidence: 88%

“…As a consequence, a significant proportion of the relatively high energy required for vaporisation is lost from the target area, reducing system efficiency and often producing a recognisable heat affected zone (HAZ) [3,4]. The HAZ can influence the geometrical accuracy, change the microstructure of the material and/or include recast material, and in severe cases can lead to the formation of microcracks [5]. HAZ reduction is influenced by many parameters, including laser power, focus, pulse frequency feed rate, and number of repeat patterns [4,6,7].…”

Section: Introductionmentioning

confidence: 99%

Increasing the efficiency of material removal using dual laser micromachining

Alkhawaldeh

Coupland

Jones

2020

Int J Adv Manuf Technol

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A continuous wave melting laser combined with a nanosecond ejection laser has been shown to improve the material removal efficiency by a factor of 2 to 8 compared with laser ablation processes reported in the literature. The decrease in the energy required for the combined lasers is primarily due to the optimisation of the irradiation time in the melting process, which is responsible for the majority of the total energy. For the laser used in this study, the optimal interaction time corresponding to the highest melting efficiency was found at 9-ms melting time, and this value is compared with results derived from a onedimensional heating model. Metallurgical images of only melting and the produced hole after introducing the ejection pulse for the most efficient melting were presented as evidence of melt ejection. The results show that approximately 90% of the melt pool is ejected with little redeposited material at the periphery of the hole.

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“…8 The conventional methods of fabricating metal stents are typically to carve the metal tube by laser engraving or chemical erosion. 9 However, the mechanical property of polymer tubes without drafting cannot be guaranteed and the polymer tubes are easily splintered during the carving process. Therefore, to fabricate polymer stents by a textile process with wire materials is an optimal method to solve these limitations.…”

mentioning

confidence: 99%

Study of the mechanical behavior of Z-structure stents produced by poly-L-lactic acid multi-ply strands

Wang

Liu

Zhang

et al. 2019

Textile Research Journal

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Biodegradable polymer stents are attracting more attention with their advantages of biocompatibility and biodegradable and dispensing with surgical removal. However, the lower radial force is the main bottle neck of their application. In the present research, poly-L-lactic monofilaments with three different diameters were adopted to produce multi-ply strands and then fabricated into Z-structure stents. The effects of strand parameters on stent radial force were studied. The monofilament, strand and stents were subsequently degraded in vitro for 48 weeks. The thermal properties, morphology change, mass retention and strength retention of samples were recorded to forecast the long-term application effects of the stents. The results of this research provided theory to optimize the processing technique of stents with a textile structure to acquire higher radial force.

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Statistical characteristics of surface integrity by fiber laser cutting of Nitinol vascular stents

Cited by 39 publications

References 23 publications

Laser surface texturing of tool steel: textured surfaces quality evaluation

Laser surface texturing of tool steel: textured surfaces quality evaluation

Increasing the efficiency of material removal using dual laser micromachining

Study of the mechanical behavior of Z-structure stents produced by poly-L-lactic acid multi-ply strands

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