The Experts below are selected from a list of 297 Experts worldwide ranked by ideXlab platform
A. W. Bowen - One of the best experts on this subject based on the ideXlab platform.
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Superplastic deformation of Ti-6Al-4V Extruded Tube
Journal of Materials Science, 1992Co-Authors: A. Wisbey, P. G. Partridge, A. W. BowenAbstract:Superplastic forming using conventional alloys and product forms may be a cost effective route for component manufacture. In this paper superplastic deformation of Ti-3Al-4V Extruded Tube is examined in terms of the strain anisotropy, microstructural changes, the texture and the post-formed tensile properties. Superplastic deformation with low flow stresses over a wide range of strain rates was observed. Strain anisotropy and surface roughening occurred during deformation and was associated with the two-phase, aligned and banded microstructure. A small reduction in the tensile properties was found and changes in the texture were noted after superplastic deformation.
A. Wisbey - One of the best experts on this subject based on the ideXlab platform.
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Superplastic deformation of Ti-6Al-4V Extruded Tube
Journal of Materials Science, 1992Co-Authors: A. Wisbey, P. G. Partridge, A. W. BowenAbstract:Superplastic forming using conventional alloys and product forms may be a cost effective route for component manufacture. In this paper superplastic deformation of Ti-3Al-4V Extruded Tube is examined in terms of the strain anisotropy, microstructural changes, the texture and the post-formed tensile properties. Superplastic deformation with low flow stresses over a wide range of strain rates was observed. Strain anisotropy and surface roughening occurred during deformation and was associated with the two-phase, aligned and banded microstructure. A small reduction in the tensile properties was found and changes in the texture were noted after superplastic deformation.
Woojin Kim - One of the best experts on this subject based on the ideXlab platform.
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Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer.
Polymers, 2020Co-Authors: Soonmo Cho, Euntaek Lee, Gyu Man Kim, Woojin KimAbstract:As the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire Tube with a polymer inner liner and outer jacket to improve the pushability and trackability. The outer jacket should have an accurate inner and outer diameter and while maintaining a wall thickness of 150 µm or less. In this study, we designed and manufactured a tip and die capable of extruding an outer jacket with a wall thickness of 150 µm or less using a medical thermoplastic elastomer for manufacturing 8Fr (2.64 mm diameter) thin-walled Tubes. The ovality and inner/outer diameters of the Tube were studied according to changes in the screw speed (mass flow rate), puller speed, air pressure applied to the lumen, and distance between the quench and head, which are the main variables of microextrusion processes. The screw speed (mass flow rate), puller speed, and air pressure affected the inner/outer diameter of the Tube, with screw speed and puller speed having the largest influence on diameter. The air pressure and distance between quench and head had the greatest influence on ovality. The results show the effect of different processing parameters on the characteristics of the Extruded Tube, which will help to establish a stable extrusion process for the manufacture of outer jackets for braided catheter shafts.
P. G. Partridge - One of the best experts on this subject based on the ideXlab platform.
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Superplastic deformation of Ti-6Al-4V Extruded Tube
Journal of Materials Science, 1992Co-Authors: A. Wisbey, P. G. Partridge, A. W. BowenAbstract:Superplastic forming using conventional alloys and product forms may be a cost effective route for component manufacture. In this paper superplastic deformation of Ti-3Al-4V Extruded Tube is examined in terms of the strain anisotropy, microstructural changes, the texture and the post-formed tensile properties. Superplastic deformation with low flow stresses over a wide range of strain rates was observed. Strain anisotropy and surface roughening occurred during deformation and was associated with the two-phase, aligned and banded microstructure. A small reduction in the tensile properties was found and changes in the texture were noted after superplastic deformation.
Soonmo Cho - One of the best experts on this subject based on the ideXlab platform.
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Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer.
Polymers, 2020Co-Authors: Soonmo Cho, Euntaek Lee, Gyu Man Kim, Woojin KimAbstract:As the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire Tube with a polymer inner liner and outer jacket to improve the pushability and trackability. The outer jacket should have an accurate inner and outer diameter and while maintaining a wall thickness of 150 µm or less. In this study, we designed and manufactured a tip and die capable of extruding an outer jacket with a wall thickness of 150 µm or less using a medical thermoplastic elastomer for manufacturing 8Fr (2.64 mm diameter) thin-walled Tubes. The ovality and inner/outer diameters of the Tube were studied according to changes in the screw speed (mass flow rate), puller speed, air pressure applied to the lumen, and distance between the quench and head, which are the main variables of microextrusion processes. The screw speed (mass flow rate), puller speed, and air pressure affected the inner/outer diameter of the Tube, with screw speed and puller speed having the largest influence on diameter. The air pressure and distance between quench and head had the greatest influence on ovality. The results show the effect of different processing parameters on the characteristics of the Extruded Tube, which will help to establish a stable extrusion process for the manufacture of outer jackets for braided catheter shafts.
