Experimental Research on the Flax/PP Thermoplastic Composite Material Hot Pressing Process

2012 ◽  
Vol 573-574 ◽  
pp. 1216-1219 ◽  
Author(s):  
Tao Hai Yan
Keyword(s):  
Composite Material ◽  
Experimental Method ◽  
Influencing Factors ◽  
Experimental Research ◽  
Hot Pressing ◽  
Thermoplastic Composite ◽  
Molding Process ◽  
Pressing Process ◽  
Composite Molding

Flax yarn and PP filament can be made into flax/ pp lapping yarn. Weaving with the lapping yarn, and finally can crank the fabric into PP/ flax composite by hot pressing. Research on the thickness of composite material and the peeling properties of the composite material, we analyzed the correlative factors about the producing technics of composite by orthogonal experimental method. The results showed that the material’s thickness and the technics are the main influencing factors of the wettability, and forecast the technics of composite molding process to get the best wettability properties.

Failure Mode and Experimental Method Research for Bond-Slip of Cold-Formed Thin-Walled Steel and Foam Concrete Composite Member

2015 ◽  
Vol 724 ◽  
pp. 33-38
Author(s):  
Dian Zhong Liu ◽  
Fa Yu Wang ◽  
Bo Li ◽  
Qiong Wu
Keyword(s):  
Theoretical Analysis ◽  
Experimental Method ◽  
Failure Mode ◽  
Influencing Factors ◽  
Experimental Research ◽  
Bonding Mechanism ◽  
Foam Concrete ◽  
Bond Slip ◽  
Thin Walled ◽  
Push Out

According to the previous experimental research on bond-slip, select push-out test as experimental method research on bond-slip between cold-formed thin-walled steel and foam concrete. Through the observation of the specimens in the push-out test, combining with the natural bonding mechanism and influencing factors summarized the failure mode and its law of composite member. The reference and basis for the experimental research and theoretical analysis of it in the future are provided.

An experimental and analytical study based on fractal theory of satin fabrics in unsaturated permeability

2016 ◽  
Vol 36 (4) ◽  
pp. 294-304
Author(s):  
Gong-Dong Wang ◽  
Qiang Chong ◽  
Li Zhou ◽  
Nan Li
Keyword(s):  
Experimental Method ◽  
Analytical Study ◽  
Fractal Theory ◽  
Liquid Composite Molding ◽  
Molding Process ◽  
Explicit Equation ◽  
Empirical Constant ◽  
Composite Molding ◽  
Unsaturated Permeability ◽  
Order Of Magnitude

Prediction of relative permeability is important to avoid dry spots or micro voids in the liquid composite molding process. Most of previous studies focused on plain and twill, but few are about stain and none of them provide explicit equation to calculate accurate values of unsaturated permeability. The main purpose of this work is to first propose a new model which is proposed mainly based on fractal theory and has no empirical constant in the expression, to calculate the permeability of satin fabric. And then we employ a new experimental method to calculate the unsaturated permeability. Finally, a contrast experiment of 5-harness fabric and 8-harness fabric is designed at different injection pressures, and the accurate values of permeability are obtained. The results show that unsaturated and saturated permeabilities are in the same order of magnitude; furthermore, unsaturated permeability is 77% of saturated permeability in 5-harness fabric and 73% in 8-harness fabric.

scholarly journals Optimization of the Hot Pressing Process for Preparing Flax Fiber/PE Thermoplastic Composite

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Yiqi Wang ◽  
Guangpeng Cui ◽  
Zhujian Shao ◽  
Yongjie Bao ◽  
Hang Gao
Keyword(s):  
Tensile Strength ◽  
Taguchi Method ◽  
Process Parameters ◽  
Hot Pressing ◽  
Signal To Noise Ratio ◽  
Flax Fiber ◽  
Thermoplastic Composite ◽  
Pressing Time ◽  
Pressing Process ◽  
Design Experiments

The hot pressing process parameters were optimized to prepare flax fiber reinforced polyethylene (PE) thermoplastic composite by the Taguchi method. The optimal hot pressing process parameters were determined to increase the tensile strength of the composite. The optimal parameters of the design include the following sections: hot pressing temperature, pressure, hot pressing time and coupling agent modification time. An L9 (3*4) orthogonal matrix based on the Taguchi method was created. By means of analysis of signal-to-noise ratio and analysis of variance, the optimal hot pressing process parameters combination was found, compared to the average tensile strength in the nine design experiments, and the tensile strength was improved nearly 10%.

scholarly journals Influence of Infiltration Pressure on the Microstructure and Properties of 2D-CFRP Prepared by the Vacuum Infiltration Hot Pressing Molding Process

Polymers ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 2014 ◽  
Author(s):  
Yuqin Ma ◽  
Yatao Zhao ◽  
Yun Zhang ◽  
Jie Wang ◽  
Yi Chen ◽  
...  
Keyword(s):  
Composite Material ◽  
Carbon Fiber ◽  
Hot Pressing ◽  
Dynamic Models ◽  
Bending Strength ◽  
Fracture Morphology ◽  
Vacuum Infiltration ◽  
Bending Test ◽  
Molding Process ◽  
Infiltration Pressure

The critical infiltration pressures of the matrix in a two-dimensional (2D) carbon fiber preform were calculated theoretically, and the calculated values of the static and dynamic models were 0.115 and 0.478 MPa, respectively. Compared with the dynamic model, there is no viscous resistance or infiltration front gas pressure in the static model, so the static value is obviously lower than the dynamic value. To verify the rationality of theoretical calculation, 2D carbon fiber reinforced plastics (2D-CFRP) with infiltration pressures of 0.5, 0.6, 0.7, 0.8, and 0.9 MPa were prepared by the vacuum infiltration hot pressing molding process. The microstructure of the composite was observed and the bending strength was tested by three-point bending test. The results show that the infiltration pressure has an important influence on the infiltration effect and the bending fracture morphology. When the infiltration pressure is 0.7 MPa, the composite has an excellent infiltration effect. The fibers distribute reasonable in the fracture. Stress can be effectively transferred when the composite material is loaded. And the bending strength of the composite material reaches 627 MPa at this time.

Development and fabrication of cement reinforced polypropylene composite material spur gear

2014 ◽  
Vol 34 (8) ◽  
pp. 775-786 ◽  
Author(s):  
Jagannath Sardar ◽  
Dibakar Bandopadhya
Keyword(s):  
Composite Material ◽  
Gear Tooth ◽  
Low Cost ◽  
Experimental Studies ◽  
Spur Gear ◽  
Thermoplastic Composite ◽  
Injection Molding Process ◽  
Polymeric Composite Material ◽  
Molding Process ◽  
Morphological Studies

Abstract A new type of polymeric composite material spur gear was developed and fabricated using low cost Portland pozzolana cement (PPC) particles as filler into the polypropylene (PP) matrix. PP granules were mixed with PPC particles and an injection-molding process was followed to manufacture the thermoplastic composite gear. Several experiments were conducted with different percentages of PPC particles with the PP to optimize the gear material (cement filled poly-propylene composite) for fabrication. Tensile tests were conducted and the morphological studies of the fractured surface of the gear materials were investigated using scanning electron microscopy (SEM) and field emission SEM (FE-SEM). Dynamic mechanical analysis (DMA) was carried out and viscoelastic properties of the gear materials were studied with varying temperature. Further, extensive experimental studies were carried out to evaluate the performance of the gear tooth under loading conditions. The experimental results validate the suitability of the proposed non-metallic spur gear for low cost industrial applications.

Preparation of Superhydrophobic Fabric Based on the SiO 2 @PDFMA Nanocomposites by an Emulsion Graft Polymerization and a Hot‐Pressing Process

2021 ◽  
Vol 6 (22) ◽  
pp. 5646-5654
Author(s):  
Xiaoli Liu ◽  
Youcai Gu ◽  
Tengfei Mi ◽  
Yuehua Zhao ◽  
Xiaomei Wang ◽  
...  
Keyword(s):  
Hot Pressing ◽  
Graft Polymerization ◽  
Pressing Process

scholarly journals A Conceptional Approach of Resin-Transfer-Molding to Rosin-Sourced Epoxy Matrix Green Composites

Aerospace ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 5
Author(s):  
Sicong Yu ◽  
Xufeng Zhang ◽  
Xiaoling Liu ◽  
Chris Rudd ◽  
Xiaosu Yi
Keyword(s):  
Composite Laminates ◽  
Resin Transfer Molding ◽  
High Viscosity ◽  
Ramie Fiber ◽  
Liquid Composite Molding ◽  
Curing Agent ◽  
Molding Process ◽  
Transfer Molding ◽  
Low Viscosity ◽  
Composite Molding

In this concept-proof study, a preform-based RTM (Resin Transfer Molding) process is presented that is characterized by first pre-loading the solid curing agent onto the preform, and then injecting the liquid nonreactive resin with an intrinsically low viscosity into the mold to infiltrate and wet the pre-loaded preform. The separation of resin and hardener helped to process inherently high viscosity resins in a convenient way. Rosin-sourced, anhydrite-cured epoxies that would normally be regarded as unsuited to liquid composite molding, were thus processed. Rheological tests revealed that by separating the anhydrite curing agent from a formulated RTM resin system, the remaining epoxy liquid had its flowtime extended. C-scan and glass transition temperature tests showed that the preform pre-loaded with anhydrite was fully infiltrated and wetted by the liquid epoxy, and the two components were diffused and dissolved with each other, and finally, well reacted and cured. Composite laminates made via this approach exhibited roughly comparable quality and mechanical properties with prepreg controls via autoclave or compression molding, respectively. These findings were verified for both carbon and ramie fiber composites.

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