Roll-over analysis of a new design carbon fiber prosthetic foot

Background:Dynamic elastic response prosthetic feet are designed to mimic the functional characteristics of the native foot/ankle joint. Numerous designs of dynamic elastic response feet exist which make the prescription process difficult, especially because of the lack of empirical evidence describing the objective performance characteristics of the feet.Objectives:To quantify the mechanical properties of available dynamic elastic response prosthetic feet, specifically the stiffness and hysteresis.Study design:Mechanical testing of dynamic elastic response prosthetic feet.Methods:Static Proof Testing in accordance with ISO 10328 was conducted on seven dynamic elastic response prosthetic feet. Load–displacement data were used to calculate the instantaneous stiffness in both the heel and forefoot regions, as well as hysteresis associated with each foot.Results:Heel stiffness was greater than forefoot stiffness for all feet. The heel of the glass composite prosthetic foot was stiffer than the carbon fiber feet and it exhibited less hysteresis. Two different carbon fiber feet had the stiffest forefoot regions.Conclusion:Mechanical testing is a reproducible method that can be used to provide objective evidence about dynamic elastic response prosthetic foot performance and aid in the prescription process.Clinical relevanceThe quantitative stiffness and hysteresis data from this study can be used by prosthetists to aid the prescription process and make it more objective.

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TRANSTIBIAL AMPUTEE GAIT WITH THE PRO-FLEX FOOT DURING LEVEL, DECLINE, AND INCLINE WALKING

Canadian Prosthetics & Orthotics Journal ◽

10.33137/cpoj.v1i2.32003 ◽

2018 ◽

Author(s):

Matthew Tomkin ◽

Hossein Gholizadeh ◽

Emily Sinitski ◽

Edward D Lemaire

Keyword(s):

Decision Making ◽

Carbon Fiber ◽

Range Of Motion ◽

Poster Presentation ◽

National Assembly ◽

Prosthetic Foot ◽

Transtibial Amputee ◽

Gait Parameters ◽

Incline Walking ◽

Amputee Gait

INTRODUCTION The Össur Pro-Flex is a 3-blade carbon fiber prosthetic foot designed to provide greater ankle range of motion compared to conventional energy storing and returning prosthetic feet1,2. To provide knowledge on Pro-Flex biomechanical performance, kinematic and kinetic gait parameters were evaluated and compared with the Össur Pro-Flex XC prosthetic foot. Outcomes from this study provide clinical professionals with important decision-making knowledge about two innovative energy storing and returning prosthetic feet. Abstract PDF Link: https://jps.library.utoronto.ca/index.php/cpoj/article/view/32003/24424 How to cite: Tomkin M, Gholizadeh H, Sinitski E, Lemaire E.D. TRANSTIBIAL AMPUTEE GAIT WITH THE PRO-FLEX FOOT DURING LEVEL, DECLINE, AND INCLINE WALKING. CANADIAN PROSTHETICS & ORTHOTICS JOURNAL, VOLUME 1, ISSUE 2, 2018; ABSTRACT, POSTER PRESENTATION AT THE AOPA’S 101ST NATIONAL ASSEMBLY, SEPT. 26-29, VANCOUVER, CANADA, 2018. DOI: https://doi.org/10.33137/cpoj.v1i2.32003 Abstracts were Peer-reviewed by the American Orthotic Prosthetic Association (AOPA) 101st National Assembly Scientific Committee. http://www.aopanet.org/

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Performance of Athletic Prosthetic Feet Made of Various Composite Materials with PMMA Matrix: Numerical and Theoretical Study

Revue des composites et des matériaux avancés ◽

10.18280/rcma.310410 ◽

2021 ◽

Vol 31 (4) ◽

pp. 257-264

Author(s):

Hayder Kareem Talla ◽

Jawad Kadhim Oleiwi ◽

Abdul Kareem F. Hassan

Keyword(s):

Composite Materials ◽

Carbon Fiber ◽

Boundary Conditions ◽

Glass Fiber ◽

Carbon Fibers ◽

Glass Fibers ◽

The Finite Element Method ◽

Prosthetic Foot ◽

Prosthetic Limbs ◽

Number Of Classes

Prosthetic upgrades are specialized prosthetics that enable patients to participate in more demanding recreational activities, such as running. This study examines the use of prosthetic limbs, specifically the athletic prosthetic foot. The current research focused on the manufacturing and production properties of an samples athletic prosthetic Foot made from composite materials based on a polymethyl methacrylate resin (PMMA) reinforced with various fibers (UHMWPE, Perlon, Carbon fiber, and Glass fiber). The finite element method (ANSYS-19R) is used to build an athletic prosthetic model and apply boundary conditions to investigate the influence of deformation and stored energy on the performance of the sports prosthetic foot. Six laminates have been manufactured, and it has been discovered that adding a number of carbon fiber layers to UHMWPE has a better effect on deformation than adding a glass fiber 26% improvement. Furthermore, the findings show there is an improvement in performance when the number of classes was doubled, as the rate of improvement between the laminate to which carbon fibers were added was 31%, and between the laminate to which glass fibers were added by 32% under the same boundary conditions.

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Effects of high pressure on the crystallization of carbon fiber reinforced polyetheretherketone (CF/PEEK) laminate composites

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100177519 ◽

1990 ◽

Vol 48 (4) ◽

pp. 876-877

Author(s):

Hong-Ming Lin ◽

C. H. Liu ◽

R. F. Lee

Keyword(s):

High Pressure ◽

Carbon Fiber ◽

Sample Surface ◽

High Yield ◽

Fiber Reinforced ◽

Laminate Composites ◽

Peek Composite ◽

Continuous Carbon Fiber ◽

Carbon Fiber Reinforced

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.

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Enhanced performance of supercapacitors by constructing a “mini parallel-plate capacitor” in an electrode with high dielectric constant materials

Journal of Materials Chemistry A ◽

10.1039/d0ta04364h ◽

2020 ◽

Vol 8 (32) ◽

pp. 16661-16668

Author(s):

Huayao Tu ◽

Shouzhi Wang ◽

Hehe Jiang ◽

Zhenyan Liang ◽

Dong Shi ◽

...

Keyword(s):

Dielectric Constant ◽

Carbon Fiber ◽

Parallel Plate ◽

Sandwich Structure ◽

High Dielectric Constant ◽

Parallel Plate Capacitor ◽

Plate Capacitor ◽

Fiber Metal ◽

High Dielectric ◽

Mini Plate

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.

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