scholarly journals Improvement of the Shock Absorption Ability of a Face Guard by Incorporating a Glass-Fiber-Reinforced Thermoplastic and Buffering Space

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Takahiro Wada ◽  
Hiroshi Churei ◽  
Haruka Takayanagi ◽  
Naohiko Iwasaki ◽  
Toshiaki Ueno ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Maximum Stress ◽  
Flexural Modulus ◽  
Maximum Load ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Shock Absorption ◽  
Glass Fiber Reinforced ◽  
Test Shock ◽  
Materials Used

This study aimed to evaluate the shock absorption ability of trial face guards (FGs) incorporating a glass-fiber-reinforced thermoplastic (GF) and buffering space. The mechanical properties of 3.2 mm and 1.6 mm thick commercial medical splint materials (Aquaplast, AP) and experimental GF prepared from 1.6 mm thick AP and fiberglass cloth were determined by a three-point bending test. Shock absorption tests were conducted on APs with two different thicknesses and two types of experimental materials, both with a bottom material of 1.6 mm thick AP and a buffering space of 30 mm in diameter (APS) and with either (i) 1.6 mm thick AP (AP-APS) or (ii)  1.6 mm thick GF (GF-APS) covering the APS. The GF exhibited significantly higher flexural strength (64.4 MPa) and flexural modulus (7.53 GPa) than the commercial specimens. The maximum load of GF-APS was 75% that of 3.2 mm AP, which is widely used clinically. The maximum stress of the GF-APS only could not be determined as its maximum stress is below the limits of the analysis materials used (<0.5 MPa). Incorporating a GF and buffering space would enhance the shock absorption ability; thus, the shock absorption ability increased while the total thickness and weight decreased.

scholarly journals Application of Glass Fiber and Carbon Fiber-Reinforced Thermoplastics in Face Guards

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 18
Author(s):  
Takahiro Wada ◽  
Hiroshi Churei ◽  
Mako Yokose ◽  
Naohiko Iwasaki ◽  
Hidekazu Takahashi ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Glass Fiber ◽  
Impact Testing ◽  
Fiber Reinforced ◽  
Shock Absorption ◽  
Glass Fiber Reinforced ◽  
Field Of Vision ◽  
Commercial Glass ◽  
Carbon Fiber Reinforced ◽  
Reinforced Thermoplastics

Face guards (FGs) are protectors that allow for the rapid and safe return of athletes who are to play after sustaining traumatic facial injuries and orbital fractures. Current FGs require significant thickness to achieve sufficient shock absorption abilities. However, their weight and thickness render the FGs uncomfortable and reduce the field of vision of the athlete, thus hindering their performance. Therefore, thin and lightweight FGs are required. We fabricated FGs using commercial glass fiber-reinforced thermoplastic (GFRTP) and carbon fiber-reinforced thermoplastic (CFRTP) resins to achieve these requirements and investigated their shock absorption abilities through impact testing. The results showed that an FG composed of CFRTP is thinner and lighter than a conventional FG and has sufficient shock absorption ability. The fabrication method of an FG comprising CFRTP is similar to the conventional method. FGs composed of commercial FRTPs exhibit adequate shock absorption abilities and are thinner and lower in weight as compared to conventional FGs.

scholarly journals Thermoplastic Reaction Injection Pultrusion for Continuous Glass Fiber-Reinforced Polyamide-6 Composites

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 463 ◽  
Author(s):  
Ke Chen ◽  
Mingyin Jia ◽  
Hua Sun ◽  
Ping Xue
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
High Speed ◽  
Flexural Modulus ◽  
Polyamide 6 ◽  
Thermoplastic Composites ◽  
Fiber Reinforced ◽  
Pultrusion Process ◽  
Glass Fiber Reinforced ◽  
Pultruded Composites

In this paper, glass fiber-reinforced polyamide-6 (PA-6) composites with up to 70 wt% fiber contents were successfully manufactured using a pultrusion process, utilizing the anionic polymerization of caprolactam (a monomer of PA-6). A novel thermoplastic reaction injection pultrusion test line was developed with a specifically designed injection chamber to achieve complete impregnation of fiber bundles and high speed pultrusion. Process parameters like temperature of injection chamber, temperature of pultrusion die, and pultrusion speed were studied and optimized. The effects of die temperature on the crystallinity, melting point, and mechanical properties of the pultruded composites were also evaluated. The pultruded composites exhibited the highest flexural strength and flexural modulus, reaching 1061 MPa and 38,384 MPa, respectively. Then, effects of fiber contents on the density, heat distortion temperature, and mechanical properties of the composites were analyzed. The scanning electron microscope analysis showed the great interfacial adhesion between fibers and matrix at 180 °C, which greatly improved the mechanical properties of the composites. The thermoplastic reaction injection pultrusion in this paper provided an alternative for the preparation of thermoplastic composites with high fiber content.

The Effect of Accelerated Salt Spray Exposure on Mechanical Properties of Glass Fiber Reinforced Polyester Composite

2021 ◽  
Vol 1028 ◽  
pp. 223-227
Author(s):  
Salman Farishi ◽  
Retno Wulandari ◽  
Annisa Rifathin ◽  
Dasep Rusmana ◽  
Nurul Jamilah
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Flexural Modulus ◽  
Salt Spray ◽  
Fiber Reinforced ◽  
Aging Behavior ◽  
Flexural Stress ◽  
Glass Fiber Reinforced ◽  
Polyester Composite ◽  
Scanning Electron

This paper presents the effect of accelerated salt spray (fog) exposure on commercially glass fiber reinforced polyester composite to determine the durability of the material. Aging behavior after exposure in the salt-spray environment was studied by mechanical properties i.e. flexural stress and flexural modulus. The accelerated salt spray exposure was conducted by Copper-Accelerated Acetic Acid Salt Spray (CASS) Test according to ASTM B368. The CASS exposure was carried out for 120 hours and observed every 24 hours. The flexural modulus results tend to be constant up to 4 days and more significant change on 5th day of measurement. Furthermore, the morphology of specimens investigated by a Scanning Electron Microscopy (SEM). The SEM results also showed that only scratch occurred on the surface of the specimens test. The longer of the CASS exposure time, the higher the number of scratches. From this study, it could be concluded that Glass Fiber Reinforced Polyester Composite has slightly damage for 120 hours CASS test exposure.

In vitro Mechanical Testing of Glass Fiber-reinforced Composite Used as Dental Implants

2008 ◽  
Vol 9 (2) ◽  
pp. 41-48 ◽  
Author(s):  
Lippo Lassila ◽  
Pekka Vallittu ◽  
Ahmed Ballo ◽  
Timo Nărhi
Keyword(s):  
Glass Fiber ◽  
Mechanical Testing ◽  
Dental Implants ◽  
Bending Test ◽  
Fiber Reinforced ◽  
Fiber Reinforced Composite ◽  
Reinforced Composite ◽  
Glass Fiber Reinforced ◽  
Polymerization Conditions

Abstract Aim The aim of this study was to evaluate the design of fiber-reinforced composite (FRC) on some mechanical properties of a dental implant. Methods and Materials FRC implants were fabricated using different polymerization conditions and designs of the glass-fiber structure. Specimens were tested with a cantilever bending test and a torsional test. The degree of monomer conversion (DC%) was measured using a Fourier transform infrared spectroscopy (FTIR). Results Statistical analysis showed significant differences between groups revealing mean fracture load values from 437 N to 1461 N. The mean torsional force in fracture varied from 0.01 to 1.66 Nm. The DC% varied from 50% to 90%. Conclusion This study suggests by modifying the polymerization conditions and fiber orientation of FRC implants, the biomechanical properties of an FRC can be tailored to the needs of dental implants. Citation Ballo AM, Lassila LV, Närhi TO, Vallittu PK. In vitro Mechanical Testing of Glass Fiber-reinforced Composite Used as Dental Implants. J Contemp Dent Pract 2008 February;(9)2:041-048.

Application Research on the New GFRP Members Based Modified Behavior Used in Building

2012 ◽  
Vol 517 ◽  
pp. 910-914
Author(s):  
Jing Huang ◽  
Zhuo Bin Wei ◽  
Yi Gao
Keyword(s):  
Glass Fiber ◽  
Unsaturated Polyester ◽  
Green Building ◽  
Material Behavior ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Plastics ◽  
Inherent Strength ◽  
Materials Used

Glass fiber reinforced plastics (GFRP) is an immensely versatile material which combines lightweight with inherent strength. For the properties of sustainability, energy efficiency and reduction of CO2 of GFRP, they can be used in green building as a kind of the energy-efficient and environment-friendly material instead of the conventional materials. Based on the less elastic modulus and lower wave-transparent properties of glass fiber reinforced plastics for unsaturated polyester resin (UPR-FRP), a new kind of glass fiber reinforced plastics based modified unsaturated polyester (MUPR-FRP) was put forward. This paper presents material behavior and technical process of the new MUPR-FRP. For the modified property, the MUPR-FRP members may have the well superiority compare with the steel and the concrete materials used in strengthening engineering and special loading resistance.

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