Fiber glass reinforced plastic~An automobile body material~Glass fiber reinforcement

1955 ◽  
Author(s):  
C. E. Hoover
Author(s):  
Mustafa Faisal Zaidan ◽  
Khudhayer J. Jadee ◽  
Salwa A. Abed

In this research a study of the influence of percentage for chopped fiber glass reinforcement thermoplastic sheet on the flexural strength. Hot compression method used to fabricate thermoplastic (polypropylene and polyamide) reinforced by fiber glass at different percentage (10,20,30,40) wt.%, the flexural strength test done by using three-point bending test. The results shown that for bending test the sample glass fiber reinforcement polyamide (GFRPA) and sample glass fiber reinforcement polypropylene (GFRPP), which reinforced with 40% fiber glass achieved the high magnitude of flexural strength (106.1 and 70.8) MPa respectively. While the sample polyamide (PA) and polypropylene (PP) without reinforcement show the lowest magnitude of flexural strength (59.5 and 38.4) MPa respectively.  


2009 ◽  
Vol 79 (3) ◽  
pp. 546-550 ◽  
Author(s):  
Makiha Shinya ◽  
Akikazu Shinya ◽  
Lippo V. J. Lassila ◽  
Juha Varrela ◽  
Pekka K. Vallittu

Abstract Objective: To test the hypothesis that there is no difference in the degree of conversion (DC%) of orthodontic composites during the light-curing process with or without the use of a glass-fiber reinforcement. Materials and Methods: Two light-curing orthodontic adhesives, Transbond XT (TB) and Beauty Ortho Bond (BO), were used with woven preimpregnated glass fibers. The degree of monomer conversion was determined for both adhesives in three settings (n = 5 per group): in the first group, the adhesive was cured without a bracket (control); in the second group, the bracket was bonded using adhesive without fiber reinforcement; and in the third group, a layer of glass-fiber net was added between the bracket and resin. The adhesive resin was light cured, and the DC% was determined by Fourier transform infrared spectroscopy. Results: A two-way analysis of variance revealed significant differences in the DC% (P < .001) between adhesives and between the fiber-reinforced and nonreinforced groups. When the nonreinforced adhesives were light cured under the brackets, the DC% was significantly lower (TB: 37.0%, SD 3.4; BO: 36.9%, SD 1.9) compared with the control (TB: 54.7%, SD 0.6; BO: 65.9%, SD 0.5). A higher DC% was found when the resin was light cured in the presence of a glass-fiber net (TB: 44.1%, SD 0.3; BO: 55.3%, SD 1.7). Conclusion: The hypothesis is rejected. The degree of monomer conversion of the light-curing adhesive resin under stainless steel bracket can be improved by adding a thin layer of glass-fiber–reinforced composite between the bracket and adhesive resin.


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