scholarly journals Novel Continuous Fiber Bi-Matrix Composite 3-D Printing Technology

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 3011 ◽  
Author(s):  
Adi Adumitroaie ◽  
Fedor Antonov ◽  
Aleksey Khaziev ◽  
Andrey Azarov ◽  
Mikhail Golubev ◽  
...  
Keyword(s):  
Matrix Material ◽  
Fiber Reinforced Polymer ◽  
Material System ◽  
The Novel ◽  
Fiber Reinforced ◽  
Continuous Fiber ◽  
New Paradigm ◽  
Fused Filament Fabrication ◽  
Reinforced Polymer ◽  
Mechanical Performances

A new paradigm in continuous fiber-reinforced polymer fused filament fabrication based on a thermoset-thermoplastic bi-matrix material system is proposed and proved. This totally new 3-D printing concept has the potential to overcome the drawbacks and to combine the advantages of separate thermoset and thermoplastic-based, fused filament fabrication methods and to advance continuous fiber-reinforced polymer 3-D printing toward higher mechanical performances of 3-D printed parts. The novel bi-matrix 3-D printing method and preliminary results related to the 3-D printed composite microstructure and performances are reported.

Subsurface and At-Depth Interphase Characterization in Hygrothermal Aged Carbon Fiber Reinforced Polymer Matrix Composite

2020 ◽  
Author(s):  
Masoud Yekani Fard ◽  
Brian Raji ◽  
Heidi Pankretz ◽  
Jack Mester ◽  
Alek Pensky
Keyword(s):  
Carbon Fiber ◽  
Epoxy Matrix ◽  
Matrix Material ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Mapping Technique ◽  
Fiber Reinforced ◽  
Interphase Region ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

Abstract The interphase region between the carbon monofilament and epoxy matrix in Carbon Fiber Reinforced Polymer Composites (CFRPs) is immensely vital to transfer stress between carbon monofilament and bulk matrix material. To the best of the authors’ knowledge, no other research group has studied the interphase region at subsurface and at-depth levels on hygrothermal aged CFRPs. The composite samples were exposed to 60° C and 90% humidity for one and two years. Moisture absorptions were measured periodically to assess water gain in the material. The advanced Atomic Force Microscopy (AFM) based Peak Force Quantitative Nanomechanics Mapping Technique was used to study the physics of the interphase. PFQNM allows non-destructive and simultaneous capture of imaging and mechanical property data with nanometer resolution. The interphase thickness was increased with increased hygrothermal exposure time. The interphase surrounding carbon monofilaments exhibited nonuniform thickness, ranging from ∼85 to 95 nm in the subsurface level, and from ∼10 to 75 nm on the at-depth level. Aged samples showed a decrease in average surface roughness, likely due to swelling of the epoxy matrix caused by the moisture absorption. The water diffusion generally followed Fickian.

Temperature-Dependent Interfacial Debonding and Frictional Behavior of Fiber-Reinforced Polymer Composites

2019 ◽  
Vol 86 (9) ◽  
Author(s):  
Qiyang Li ◽  
Guodong Nian ◽  
Weiming Tao ◽  
Shaoxing Qu
Keyword(s):  
Linear Thermal Expansion ◽  
Fiber Reinforced Polymer ◽  
Frictional Stress ◽  
Material System ◽  
Fiber Reinforced ◽  
Interfacial Behavior ◽  
Temperature Dependent ◽  
Frictional Sliding ◽  
Reinforced Polymer ◽  
Wide Range

As fiber-reinforced polymer matrix composites are often cured from stress-free high temperature, when subjected to ambient temperature, both the mismatch of the coefficient of linear thermal expansion between the fiber and the matrix and the dependence of material properties on temperature will influence the interfacial behavior. Thus, it is necessary to provide an insight into the mechanism of temperature effects on the thermomechanical properties and behaviors along the interface. In this work, we conducted microbond tests of the glass fiber–epoxy material system at controlled testing temperature (Tt). A modified interface model is formulated and implemented to study the interfacial decohesion and frictional sliding behavior of microbond tests at different Tt. With proper cohesive parameters obtained, the model can predict temperature-dependent interfacial behaviors in fiber-reinforced composites. Both the slope of the peak force as well as the measured force at the stage of frictional sliding decrease with Tt in a wide range of the length of microdroplet-embedded fiber (le). The interfacial shear strength (IFSS) keeps almost constant at Tt ≤ 40 °C and decreases with le when temperature is above 40 °C. The average frictional stress (τfAverage) along the interface increases with le when temperature is below 80 °C but is almost constant when temperature is above or equal to 80 °C. Overall, in the same range of le, τfAverage is greater when Tt is at low temperature.

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