The Experts below are selected from a list of 222 Experts worldwide ranked by ideXlab platform
Behnam Akhoundi - One of the best experts on this subject based on the ideXlab platform.
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3d printed pcl scaffold reinforced with continuous biodegradable Fiber yarn a study on mechanical and cell viability properties
Polymer Testing, 2020Co-Authors: Seyyed Kaveh Hedayati, Sadegh Hasannia, Arvin Bagheri Saed, Amir Hossein Behravesh, Behnam AkhoundiAbstract:Abstract In this study, poly (e‐caprolactone) (PCL) scaffolds were printed and reinforced, simultaneously, with biodegradable poly glycolic acid (PGA) suture yarn, as a continuous Reinforcing Fiber, in the Fused Deposition Modeling (FDM) 3D printing process. Albeit PCL is a suitable material for biomedical applications, its low mechanical properties, and low degradation rate have limited its usage. A biocompatible suture yarn was used as the Reinforcing material to enhance the mechanical properties and biodegradation characteristics, via an innovative method of continuous Fiber embedding in the FDM process. The reinforced PCL samples were 3D printed with the setting porosity value of 60% and 0°/60°/120° lay-down pattern. The mechanical and biological properties of the scaffolds were tested to prove the effectiveness of the produced scaffolds for bone substitute purposes. Mechanical properties assessments showed that with a 22 vol.% suture yarn content in the 3D printed PCL scaffolds, the tensile strength, and elastic modulus remarkably increased up to 374% and 775%, respectively. The degradation of the reinforced PCL was 20 times higher than that of the non-reinforced PCL samples, after ten weeks, dominated by the Fiber degradation phenomenon. After three days of cell culture, the proliferation assay of the built scaffovd the non-toxicity of the reinforced PCL.
Taro Nakamura - One of the best experts on this subject based on the ideXlab platform.
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Development of pneumatic soft actuator using high strain elastic material with stress anisotropy by short Fibers
Proceedings, 2020Co-Authors: Akihiro Kojima, Manabu Okui, Taro NakamuraAbstract:In recent years, soft robots, such as those with high human affinity and those that excellently imitate the movements of natural creatures, have gained considerable attention. In soft robots, structurally flexible soft actuators need to be used, not conventional motors or hydraulic/pneumatic cylinders. Various types of soft actuators have been developed depending on the driving principle. A pneumatic rubber artificial muscle is a kind of soft actuator that acquires power through injection of a working fluid, such as air, into an elastic structure, such as rubber. In this study, the authors developed an actuator, namely, the straight-Fiber-type artificial muscle, which exhibits excellent contraction characteristics. This artificial muscle consists of a rubber tube that contains Reinforcing Fibers arranged in the axial direction. When air pressure is applied to the rubber tube, the artificial muscle expands only in the radial direction and contracts in the axial direction due to the restraining effect of the Reinforcing Fiber. While this artificial muscle exhibits excellent contraction properties, it has some drawbacks. One is the difficulty in enclosing the reinforced Fibers that have accumulated in the rubber tube, making this artificial muscle difficult to manufacture. In this study, we investigated short-Fiber-reinforced artificial muscles that can be easily manufactured. First, a short-Fiber-reinforced rubber was prepared, and anisotropy was evaluated via a tensile test. Then, the short-Fiber-reinforced artificial muscles were prepared, and their contractions rates were evaluated. The results confirmed that a short-Fiber-reinforced rubber can be useful for the manufacture of artificial muscles.
Seyyed Kaveh Hedayati - One of the best experts on this subject based on the ideXlab platform.
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3d printed pcl scaffold reinforced with continuous biodegradable Fiber yarn a study on mechanical and cell viability properties
Polymer Testing, 2020Co-Authors: Seyyed Kaveh Hedayati, Sadegh Hasannia, Arvin Bagheri Saed, Amir Hossein Behravesh, Behnam AkhoundiAbstract:Abstract In this study, poly (e‐caprolactone) (PCL) scaffolds were printed and reinforced, simultaneously, with biodegradable poly glycolic acid (PGA) suture yarn, as a continuous Reinforcing Fiber, in the Fused Deposition Modeling (FDM) 3D printing process. Albeit PCL is a suitable material for biomedical applications, its low mechanical properties, and low degradation rate have limited its usage. A biocompatible suture yarn was used as the Reinforcing material to enhance the mechanical properties and biodegradation characteristics, via an innovative method of continuous Fiber embedding in the FDM process. The reinforced PCL samples were 3D printed with the setting porosity value of 60% and 0°/60°/120° lay-down pattern. The mechanical and biological properties of the scaffolds were tested to prove the effectiveness of the produced scaffolds for bone substitute purposes. Mechanical properties assessments showed that with a 22 vol.% suture yarn content in the 3D printed PCL scaffolds, the tensile strength, and elastic modulus remarkably increased up to 374% and 775%, respectively. The degradation of the reinforced PCL was 20 times higher than that of the non-reinforced PCL samples, after ten weeks, dominated by the Fiber degradation phenomenon. After three days of cell culture, the proliferation assay of the built scaffovd the non-toxicity of the reinforced PCL.
Akihiro Kojima - One of the best experts on this subject based on the ideXlab platform.
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Development of pneumatic soft actuator using high strain elastic material with stress anisotropy by short Fibers
Proceedings, 2020Co-Authors: Akihiro Kojima, Manabu Okui, Taro NakamuraAbstract:In recent years, soft robots, such as those with high human affinity and those that excellently imitate the movements of natural creatures, have gained considerable attention. In soft robots, structurally flexible soft actuators need to be used, not conventional motors or hydraulic/pneumatic cylinders. Various types of soft actuators have been developed depending on the driving principle. A pneumatic rubber artificial muscle is a kind of soft actuator that acquires power through injection of a working fluid, such as air, into an elastic structure, such as rubber. In this study, the authors developed an actuator, namely, the straight-Fiber-type artificial muscle, which exhibits excellent contraction characteristics. This artificial muscle consists of a rubber tube that contains Reinforcing Fibers arranged in the axial direction. When air pressure is applied to the rubber tube, the artificial muscle expands only in the radial direction and contracts in the axial direction due to the restraining effect of the Reinforcing Fiber. While this artificial muscle exhibits excellent contraction properties, it has some drawbacks. One is the difficulty in enclosing the reinforced Fibers that have accumulated in the rubber tube, making this artificial muscle difficult to manufacture. In this study, we investigated short-Fiber-reinforced artificial muscles that can be easily manufactured. First, a short-Fiber-reinforced rubber was prepared, and anisotropy was evaluated via a tensile test. Then, the short-Fiber-reinforced artificial muscles were prepared, and their contractions rates were evaluated. The results confirmed that a short-Fiber-reinforced rubber can be useful for the manufacture of artificial muscles.
Tatsuki Matsuo - One of the best experts on this subject based on the ideXlab platform.
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Weave and Its Weaving Method by Using Reinforcing Fiber Tow Widely Opened.
Journal of the Society of Materials Science Japan, 2000Co-Authors: Shigeru Tomoda, Kazumasa Kawabe, Tatsuki MatsuoAbstract:Reinforcing Fiber tow can be more widely and thinly opened than its original tow, by using the new pneumatic method previously reported. The opened tow is so wide and thin that it can not be applied to conventional weaving machines. Accordingly, a new weaving method was devised in which the motions of warp yarn supply, shedding, weft insertion, read beat-up and cloth take-up are different from those of conventinal method, and by which not only rectangular (0°/90°) weave, but also bias (0°/α°) weave can be produced. 12K carbon Fiber tow was opened over the width of 16mm and then applied to the new weaving machine made for trials.As a result, (0°/30°, 45°, 60°, 90°) weaves were smoothly produced without distortion of weaving yarn, nap and weave opening. Their fabric weight and thickness are lighter and thinner than those of the weave by using the 1K tow. In addition, their weaving crimp angle of warp yarn in these weaves is much smaller than that in conventional weave.
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The Impregnation Behavior of Matrix Resin into the Opened Reinforcing Fiber Tows.
Journal of the Society of Materials Science Japan, 1998Co-Authors: Kazumasa Kawabe, Tatsuki Matsuo, Zenichiro MaekawaAbstract:The technology for opening tow was applied to the opening of Reinforcing Fiber tow for thermoplastic composites. The effect of its opening on the impregnation behaviors of matrix resin was inveatigated in comparison with those for unopened tow through experiments and theoretical calculations. On-line measurement of void volume change during compression molding for carbou Fiber/nylon 6 composite was carried out. Micro-scopic observation on the cross-section of parts fabricated at several molding time and measurement of transverse bending strength of these parts were also conducted. Based on the theoretical model presented previously, the void volume changes for several molding conditions were simulated under a certain assumptive void pressure-change. All these results show consistently that the tow opening makes the impregnation of matrix resin into the Reinforcing Fiber much easier.