STUDY ON COOLING RATE-DEPENDENT MECHANICAL PROPERTIES OF THERMOPLASTIC COMPOSITES

2021 ◽  
Author(s):  
RYO HIGUCHI ◽  
SOTA OSHIMA ◽  
SHU MINAKUCHI ◽  
TOMOHIRO YOKOZEKI ◽  
TAKAHIRA AOKI
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Polyphenylene Sulfide ◽  
Constitutive Law ◽  
Thermoplastic Composites ◽  
Plastic Behavior ◽  
Thermoplastic Resin ◽  
Rate Dependent ◽  
Reinforced Thermoplastics ◽  
Fiber Reinforced Thermoplastics

This study investigates the effect of solidification conditions on the crystallization behaviors and mechanical properties of thermoplastic resin and carbon fiber reinforced thermoplastics (CFRTP). In particular, the crystallinity, elastic modulus, plastic behavior, strength, and fracture toughness were investigated in Polyphenylene Sulfide (PPS) and CF/PPS manufactured by different cooling rates. Based on experimental results, the cooling-rate-dependent elasto-plastic constitutive law of resin was developed empirically. Finally, the homogenized simulations of CF/PPS were conducted using the developed empirical model, and predicted results were compared with experiments.

Effect of Press Condition on the Mechanical Properties of GFRTP Molded by the Melted Thermoplastic-Resin Transfer Molding

2018 ◽  
Vol 774 ◽  
pp. 367-372
Author(s):  
Kazuto Tanaka ◽  
Akihiro Hirata ◽  
Tsutao Katayama
Keyword(s):  
Mechanical Properties ◽  
Shell Structure ◽  
Low Cost ◽  
Resin Transfer Molding ◽  
Outer Shell ◽  
Fiber Reinforced ◽  
Thermoplastic Resin ◽  
Transfer Molding ◽  
Reinforced Thermoplastics ◽  
Fiber Reinforced Thermoplastics

The application of Fiber Reinforced Thermoplastics (FRTP) is expected to reduce the weight of automobiles. The press and injection hybrid molding method was developed to mold FRTP with high strength and high stiffness by giving complicated shapes such as ribs and bosses to the outer shell structure of FRTP with continuous fiber. However, as this method uses high-cost FRTP laminated sheets, it is necessary to develop a low-cost FRTP manufacturing process. In this study, we aim at the development of Melted Thermoplastic-Resin Transfer Molding (MT-RTM) to mold FRTP with complicated shape at low cost by injecting melted short fiber reinforced thermoplastics into dry fabric. The effects of press condition on the mechanical properties of GFRTP molded by MT-RTM were clarified by bending tests. GFRTP molded at high mold temperature and high closing speed showed high mechanical properties because of good impregnation of injection resin into continuous fabric in the outer shell structure.

Intraply Shearing Characterization of Thermoplastic Composite Materials in Thermoforming Processes

2012 ◽  
Vol 504-506 ◽  
pp. 243-248 ◽  
Author(s):  
Peng Wang ◽  
Nahiene Hamila ◽  
Philippe Boisse
Keyword(s):  
Mechanical Properties ◽  
Composite Materials ◽  
Shear Behavior ◽  
Mechanical Analysis ◽  
Polyphenylene Sulfide ◽  
Thermoplastic Composite ◽  
Thermoplastic Composites ◽  
Thermoplastic Resin ◽  
Plane Shear ◽  
Significant Difference

The Continuous Fibre Reinforcements and Thermoplastic resin (CFRTP) are widely employed in the prepreg processes. Currently, the most used thermoplastic resins in aeronautics are PPS (polyphenylene sulfide) and PEEK (Polyetheretherketone). They present many advantages on their mechanical properties. However, these mechanical properties depend strongly upon the thermoforming conditions, especially the intraply shearing. In order to improve and complete the understanding about the in-plane shear behavior of thermoplastic composite materials in their forming processes, the thermo-mechanical analysis of PPS/carbon and PEEK/carbon commingled fabrics at different forming temperatures are performed by using the bias-extension tests. The experimental data leads to significant difference on the in-plane shear behavior under different temperature, as well as the wrinkles can be noted in certain thermoforming conditions. Therefore, in order to predict the feasible forming conditions and optimize the important forming parameters of the thermoplastic composites, the in-plan shear behaviors in function of temperature will be integrated into our numerical model to carry out the numerical simulations of thermoforming processes.

Cooling-rate-dependent microstructure and mechanical properties of a CuZrAlAg alloy

2014 ◽  
Vol 94 (11) ◽  
pp. 716-723
Author(s):  
Ji Gu ◽  
Yihan Wang ◽  
Lixin Zhang ◽  
Song Ni ◽  
Min Song
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Rate Dependent ◽  
Microstructure And Mechanical Properties

scholarly journals AN EXPERIMENTAL EVALUATION OF FIBER REINFORCED POLYPROPYLENE THERMOPLASTICS FOR AEROSPACE APPLICATIONS

2014 ◽  
Vol 43 (2) ◽  
pp. 92-97 ◽  
Author(s):  
K. Vijaya Kumar ◽  
Mir Safiulla ◽  
A.N. Khaleel Ahmed
Keyword(s):  
Epoxy Matrix ◽  
Natural Fiber ◽  
High Strength ◽  
Polyphenylene Sulfide ◽  
Environmental Stability ◽  
Fiber Reinforced ◽  
Aerospace Applications ◽  
Thermosetting Polymers ◽  
Reinforced Thermoplastics ◽  
Fiber Reinforced Thermoplastics

Fiber reinforced thermosetting composites have wide scope in the field of Aerospace and MilitaryApplications. These materials exhibit high strength and high stiffness, besides these composites have long fatiguelife, corrosion resistance, environmental stability, thermal insulation and conductivity. Researchers areexploring possibilities to use natural fiber reinforced polymer composites (NFRPCs) in response to the increasingdemand for environmentally friendly materials and also to develop reusable fiber reinforced thermoplastics withthe desire to reduce the cost and to promote the replacement of thermosetting composites.In this work efforts are put to fabricate fiber thermoplastics made of jute, glass and carbon with (PP)polypropylene as the matrix. The mechanical strength of these fiber reinforced thermoplastics was evaluated andcompared with that of fiber reinforced thermosetting polymers made of same fibers along with epoxy matrix. Thetests clearly indicate that the laminates made of fiber reinforced polypropylene have 7 to 8 times less strengthcompared to thermosetting polymers made of fiber epoxy and it is found that for achieving better strength of thematerial, the polypropylene layers should be more than that of the epoxy matrix or to use alternative thermoplasticmaterials like polyphenylene sulfide (PPS), polyetherimide (PEI) and polyetheretherketone (PEEK). Hence thesematerials are feasible for fabricating low load bearing aircraft interior cabin parts and automobile interiorswhich can be reused or reshaped making them easy to re-work and repair.DOI: http://dx.doi.org/10.3329/jme.v43i2.17832

scholarly journals In Situ Wire Drawing of Phosphate Glass in Polymer Matrices for Material Extrusion 3D Printing

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
J. Gilberto Siqueiros ◽  
David A. Roberson
Keyword(s):  
Mechanical Properties ◽  
3D Printing ◽  
Phosphate Glass ◽  
Acrylonitrile Butadiene Styrene ◽  
Wire Drawing ◽  
Thermoplastic Composites ◽  
Filler Materials ◽  
Material System ◽  
Thermoplastic Resin ◽  
Material Extrusion

A strategy to increase the amount of materials available for additive manufacturing platforms such as material extrusion 3D printing (ME3DP) is the creation of printable thermoplastic composites. Potential limiters to the incorporation of filler materials into a thermoplastic resin include agglomeration of the filler materials, which can compromise the mechanical properties of the material system and a static morphology of the filler material. A potential solution to these issues is the use of filler materials with low glass transition temperatures allowing for a change in morphology during the extrusion process. Here, we successfully demonstrate the drawing of phosphate glass particles into a wire-like morphology within two polymeric systems: (1) a rubberized acrylonitrile butadiene styrene (ABS) blend and (2) polylactic acid (PLA). After applying a normalization process to account for the effect of air gap within the 3D printed test specimens, an enhancement in the mechanical properties was demonstrated where an increase in strength was as high as 21% over baseline specimens. Scanning electron microanalysis was used to characterize the fracture surface and wire drawing efficacy. Factors affecting the ability to achieve wire drawing such as polymer viscosity and print temperature are also highlighted.

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