Finite element simulation and experimental validation of pulsed laser cutting of nitinol

Fu, C. H.; Sealy, Michael P.; Guo, Y. B.; Wei, Xiuting

doi:10.1016/j.jmapro.2015.06.005

Cited by 30 publications

(11 citation statements)

References 20 publications

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“…The NiTi alloy is in martensitic phase at low temperatures and in the austenitic phase at high temperatures [4]. A review of the literature showed that different manufacturing processes are used for the machining of NiTi alloy such as laser processing method [5][6][7][8][9][10][11][12][13][14][15][16], electrical discharge machining (EDM) [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31], electrochemical polishing [32] and abrasive water jet processing method (AWJM) [33,34] for shaping NiTi alloy and also conventional machining methods (Turning [35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50], milling…”

Section: Introductionmentioning

confidence: 99%

Investigation Of The Effects Of Machining Parameters On Tool Life And Surface Roughness During The Face Milling Of The NiTi Shape Memory Alloy With Uncoated Tools

Altaş¹,

Gökkaya²,

Özkan³

2020

Preprint

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Shape memory alloys (SMAs) are increasingly used in the fields of aviation, automotive and biomedicine due to their unique properties. Nickel-Titanium (NiTi) alloy materials, which are one of the shape memory alloys, are among the most frequently used alloy materials. The shape memory and super elastic effects of NiTi alloys, high ductility and deformation hardening make it difficult to shape burr. An additional problem is the formation of a white layer during machining. In this study, surface milling operations were performed in dry cutting conditions with uncoated cutting tools with different nose radii. The processing parameters were determined based on the experience gained as a result of the preliminary tests. Tungsten carbide cutting tools with different nose radii (0.4mm and 0.8mm) were used for the milling operations. Milling was carried out at three different cutting speeds (20, 35, 50 m/min), feed rates (0.03, 0.07, 0.14 mm/tooth), and a constant axial cutting depth (0.7 mm). As a result of our experimental studies, the best tool life was found to be in 0.8 mm nose radius cutting tools at 20 m/min cutting speed and 0.03 mm/tooth feed rate (0.264 mm). The minimum average surface roughness was found after milling with 0.8 mm nose radius cutting tool at 20 m/min cutting speed and 0.03 mm/tooth feed rate (0.346 μm). It has been determined that increasing the cutting tool nose radius reduces both the flank wear over the cutting tool and the average surface roughness.

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Section: Introductionmentioning

confidence: 99%

Investigation Of The Effects Of Machining Parameters On Tool Life And Surface Roughness During The Face Milling Of The NiTi Shape Memory Alloy With Uncoated Tools

Altaş¹,

Gökkaya²,

Özkan³

2020

Preprint

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“…; in orthopaedic surgery for various staples and rods; and in maxillofacial and reconstructive surgery [6,7]. Moreover, nitinol is used in aerospace, automotive, marine and chemical industries, and civil and structural engineering [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Experimental Continuous Casting of Nitinol

Lojen

Stambolić

Batič

et al. 2020

Metals

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Commercially available nitinol is currently manufactured using classic casting methods that produce blocks, the processing of which is difficult and time consuming. By continuous casting, wherein molten metal solidifies directly into a semi-finished product, the casting and processing of ingots can be avoided, which saves time and expense. However, no reports on continuous casting of nitinol could be found in the literature. In this work, Φ 12 mm nitinol strands were continuously cast. Using a graphite crucible, smelting of pure Ni and Ti in a medium frequency induction furnace is difficult, because it is hard to prevent a stormy reaction between Ni and Ti and to reach a homogeneous melt without a prolonged long holding time. Using a clay-graphite crucible, the stormy reaction is easily controlled, while effective stirring assures a homogeneous melt within minutes. Strands of nearly equiatomic chemical compositions were obtained with acceptable surface quality. The microstructure of strands containing over 50 at. % Ni, consisted of Ti2Ni and cubic NiTi, whereas the microstructure of strands containing less than 50 at. % Ni consisted of TiNi3 and cubic NiTi. This is consonant with the results of some other authors, and indicates that the eutectoid decomposition NiTi → Ti2Ni + TiNi3 does not take place.

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“…It exhibits a unique combination of good functional properties and a high mechanical strength, such as superelasticity and a shape-memory effect, good corrosion resistance in a chloride environment, an unusual combination of strength and ductility, high tendency for self-passivation, paramagnetic properties, high fatigue strength, low Young's modulus and excellent bio-mechanical compatibility. [1][2][3][4][5][6][7] This alloy was developed in the 1970s and its properties have enabled its use, especially for biomedical purposes, first in orthodontic treatments, and later on in cardiovascular surgery for stents, guide wires, filters, etc., in orthopedic surgery for various staples and rods, and in maxillofacial and reconstructive surgery. In addition to bioengineering, nitinol has been used in aerospace, automotive, marine, chemical industries, civil and structural engineering.…”

Section: Introductionmentioning

confidence: 99%

“…In addition to bioengineering, nitinol has been used in aerospace, automotive, marine, chemical industries, civil and structural engineering. [1][2][3][4][5][6][7] Biocompatible materials can be defined as synthetic or natural biomaterials that are continuously or occasionally in contact with body fluids and can partially or totally replace any failing tissue, organ or function of the body in order to improve the quality of life of the individual. To successfully employ implants in the human body, a suitable level of tolerance of the material used within the living organism is required.…”

Section: Introductionmentioning

confidence: 99%

Determination of mechanical and functional properties by continuous vertical cast NiTi rod

Stambolić¹,

Jenko²,

Kocijan³

et al. 2018

Mater. Tehnol.

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This article presents the information of the microstructure and methods for determination of mechanical and functional properties of the Continuous Vertical Cast (CVC) NiTi rod. We prepared special samples (discs, cylinders). The results of the microhardness measurements with HV0.1 show the average Vickers hardness value 583 HV0.1 in the cross-section of the CVC NiTi rod measured from the edge toward the middle of CVC NiTi rod. The results show that Vickers hardness slightly increases towards the center of the rod as a consequence of the formatted microstructure. The results of the tensile test show a typical curve for brittle materials. The obtained results indicate that the CVC NiTi rod does not pass into a non-linear plastic region. Therefore, CVC NiTi rod is unsuitable for strain hardening. The results of the compressive test also follow the conclusions that CVC NiTi rod is brittle material. Fracture of the CVC NiTi rod sample occurs before the material enters the plastic deformation region. The cytocompatibility of the CVC NiTi rod was tested with the submersion of the samples to the HUVEC cell solution, where HUVEC cells adhered to the samples surface. A commercial NiTi alloy was used to monitor the cytocompatibility. The results show that the number of adhered HUVEC cells on the samples surface of CVC NiTi rod is smaller than on commercial NiTi. The number of dead HUVEC cells on the samples surface of CVC NiTi rod is slightly larger than on commercial NiTi. The proportion of viable HUVEC cells on the samples surface of CVC NiTi rod is 96,6 %, while on commercial NiTi 98,4 %.

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Finite element simulation and experimental validation of pulsed laser cutting of nitinol

Cited by 30 publications

References 20 publications

Investigation Of The Effects Of Machining Parameters On Tool Life And Surface Roughness During The Face Milling Of The NiTi Shape Memory Alloy With Uncoated Tools

Investigation Of The Effects Of Machining Parameters On Tool Life And Surface Roughness During The Face Milling Of The NiTi Shape Memory Alloy With Uncoated Tools

Experimental Continuous Casting of Nitinol

Determination of mechanical and functional properties by continuous vertical cast NiTi rod

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