Shear induced fiber orientation, fiber breakage and matrix molecular orientation in long glass fiber reinforced polypropylene composites

2011 ◽  
Vol 528 (7-8) ◽  
pp. 3169-3176 ◽  
Author(s):  
Jianchuan Wang ◽  
Chengzhen Geng ◽  
Feng Luo ◽  
Yanmei Liu ◽  
Ke Wang ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fiber Orientation ◽  
Molecular Orientation ◽  
Fiber Breakage ◽  
Fiber Reinforced ◽  
Polypropylene Composites ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber

scholarly journals The Effects of Strain Rates on Mechanical Properties and Failure Behavior of Long Glass Fiber Reinforced Thermoplastic Composites

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2019 ◽  
Author(s):  
Junjia Cui ◽  
Shaoluo Wang ◽  
Shuhao Wang ◽  
Guangyao Li ◽  
Peilin Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Ultimate Strength ◽  
Fracture Strain ◽  
Thermoplastic Composites ◽  
Strain Rates ◽  
Fiber Breakage ◽  
Fiber Reinforced ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber

Long glass fiber reinforced thermoplastic composites have been increasingly used in automotive parts due to their excellent mechanical properties and recyclability. However, the effects of strain rates on the mechanical properties and failure mechanisms of long glass fiber reinforced polypropylene composites (LGFRPPs) have not been studied systematically. In this study, the effects of strain rates (from 0.001 s−1 to 400 s−1) on the mechanical properties and failure mechanism of LGFRPPs were investigated. The results showed that ultimate strength and fracture strain of the LGFRPPs increased obviously, whereas the stiffness remained essentially unchanged with the strain rates from low to high. The micro-failure modes mainly consisted of fibers pulled out, fiber breakage, interfacial debonding, matrix cracking, and ductile to brittle (ductile pulling of fibrils/micro-fibrils) fracture behavior of the matrix. As the strain rates increased, the interfacial bonding properties of LGFRPPs increased, resulting in a gradual increase of fiber breakage at the fracture surface of the specimen and the gradual decrease of pull-out. In this process, more failure energy was absorbed, thus, the ultimate strength and fracture strain of LGFRPPs were improved.

Fiber breakage behavior of long glass fiber-reinforced polypropylene through the convergent channel

2017 ◽  
Vol 36 (22) ◽  
pp. 1629-1638 ◽  
Author(s):  
Guoqiang Tian ◽  
Xianrong Liang ◽  
Mengmeng Wang ◽  
Yu Lei ◽  
Gang Jin ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Fiber Breakage ◽  
Fiber Reinforced ◽  
Convergent Channel ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber ◽  
Breakage Behavior

Effect of screw design on fiber breakage and dispersion in injection-molded long glass-fiber-reinforced polypropylene

2013 ◽  
Vol 49 (1) ◽  
pp. 75-84 ◽  
Author(s):  
Akira Inoue ◽  
Kazuya Morita ◽  
Tatsuya Tanaka ◽  
Yoshihiko Arao ◽  
Yasutake Sawada
Keyword(s):  
Glass Fiber ◽  
Fiber Breakage ◽  
Fiber Reinforced ◽  
Screw Design ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber ◽  
Injection Molded

Influence of thermo-oxidative aging on flame retardancy, thermal stability, and mechanical properties of long glass fiber–reinforced polypropylene composites filled with organic montmorillonite and intumescent flame retardant

2019 ◽  
Vol 37 (2) ◽  
pp. 176-189 ◽  
Author(s):  
Ying Zhou ◽  
Weidi He ◽  
Yifan Wu ◽  
Dinghong Xu ◽  
Xiaolang Chen ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Flame Retardant ◽  
Intumescent Flame Retardant ◽  
Fiber Reinforced ◽  
Limiting Oxygen Index ◽  
Polypropylene Composites ◽  
Organic Montmorillonite ◽  
Glass Fiber Reinforced ◽  
Cone Calorimeter Test ◽  
Long Glass Fiber

In this work, the effect of thermo-oxidative aging on organic montmorillonite/intumescent flame retardant/long glass fiber–reinforced polypropylene composites was investigated for different exposure times at 140°C. Limiting oxygen index, Underwriters Laboratories-94 tests, cone calorimeter test, and thermogravimetric analysis were used to evaluate the flammability and thermal stability. The results of limiting oxygen index values, Underwriters Laboratories 94 test, and cone calorimeter test show that aging performs negative effect on the flame retardancy of organic montmorillonite/intumescent flame retardant/long glass fiber–reinforced polypropylene composites. Thermal oxidation aging markedly changes the decomposition process of organic montmorillonite/intumescent flame retardant/long glass fiber–reinforced polypropylene composites. The scanning electronic microscopy images of the external surface of composites indicate that many ground particles and micro-scale cracks are scattered in the surfaces of the composites after aging. The sharp micro-scale cracks and crazing formed on the surface promote the heat and oxygen to penetrate into the bulk of polypropylene matrix. According to the mechanical test results, the thermal oxidation aging reduces the tensile, flexural, and notched impact strengths of organic montmorillonite/intumescent flame retardant/long glass fiber–reinforced polypropylene composites.

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