Numerical predictions of fiber orientation and mechanical properties for injection-molded long-glass-fiber thermoplastic composites

2017 ◽  
Vol 150 ◽  
pp. 181-186 ◽  
Author(s):  
Huan-Chang Tseng ◽  
Rong-Yeu Chang ◽  
Chia-Hsiang Hsu
Keyword(s):  
Mechanical Properties ◽  
Glass Fiber ◽  
Fiber Orientation ◽  
Thermoplastic Composites ◽  
Numerical Predictions ◽  
Long Glass Fiber ◽  
Injection Molded

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.

Fracture Toughness of Discontinuous Long Glass Fiber Reinforced Polypropylene: An Approach Based on a Numerical Prediction of Fiber Orientation in Injection Molding

2005 ◽  
Vol 13 (2) ◽  
pp. 121-130 ◽  
Author(s):  
V. Rizov ◽  
T. Harmia ◽  
A. Reinhardt ◽  
K. Friedrich
Keyword(s):  
Fracture Toughness ◽  
Injection Molding ◽  
Glass Fiber ◽  
Fiber Orientation ◽  
Numerical Prediction ◽  
Fiber Reinforced ◽  
Local Fracture ◽  
Glass Fiber Reinforced ◽  
Long Glass Fiber ◽  
Injection Molded

The fracture toughness of discontinuous long glass fiber reinforced injection-molded polypropylene has been characterized by using the microstructural efficiency concept in combination with a numerical prediction of the fiber orientation during injection molding. The latter was performed by using the SIGMASOFT commercial software. In a three-dimensional numerical scheme, input data such as fiber volume fractions, shear viscosity and mean fiber aspect ratio have been used in order to perform the mold filling analysis. The resulted local fiber orientation parameters for injection molded square plates of long glass fiber reinforced polypropylene allowed to calculate the local fracture toughness with microstructural efficiency concept. The latter were compared with the experimental toughness values obtained by the use of compact tension test specimens. The good correlation between the calculated fracture toughness data and the measured ones shows that a fiber orientation prediction by the SIGMASOFT finite element computer code can be used in combination with the microstructural efficiency concept for the determination of local fracture toughness values in injection molded long glass fiber reinforced thermoplastics. The combined approach opens good opportunities for optimization of a thermoplastic workpiece in its design with respect to local fracture resistance. This will enable the material performance levels to be significantly extended, with consequent increases in engineering applicability.

Elastic properties of injection molded short glass fiber reinforced thermoplastic composites

2020 ◽  
Vol 254 ◽  
pp. 112850
Author(s):  
Yucheng Zhong ◽  
Ping Liu ◽  
Qingxiang Pei ◽  
Viacheslav Sorkin ◽  
Athanasius Louis Commillus ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Elastic Properties ◽  
Thermoplastic Composites ◽  
Fiber Reinforced ◽  
Short Glass Fiber ◽  
Glass Fiber Reinforced ◽  
Injection Molded ◽  
Short Glass
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