Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients

Takayama, T.; Motoyama, Yuki

doi:10.1299/mej.20-00414

Cited by 10 publications

(6 citation statements)

References 3 publications

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“…Here, υ is Poisson’s ratio; σ y in the equation is the yield initiation stress obtained under uniaxial tensile loading. Assuming that the shear yielding of polymeric materials is attributable to intermolecular friction, the shear yield initiation stress can be obtained using Equation (6) [ 15 ]:

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Section: Methodsmentioning

confidence: 99%

Inorganic Particles Contribute to the Compatibility of Polycarbonate/Polystyrene Polymer Blends

TAKAYAMA

2023

Materials

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Polycarbonate (PC), an engineering plastic, has excellent mechanical strength and toughness. Moreover, this transparent polymer material can be used in fields where materials require mechanical properties and transparency. Nevertheless, PC is known to have a high melt viscosity. Moreover, blending with polystyrene (PS), an inherently brittle material, has been used to adjust its melt viscosity. As a result, the PS makes PC/PS polymer blends more brittle than PC alone. As described herein, after attempting to achieve compatibility with inorganic particles, the results show that the dispersion of small amounts of inorganic clay and silica particles in PC/PS polymer blends maintained transparency while improving the impact strength to a level comparable to that of polycarbonate. Apparently, the inorganic particles promote the fine dispersion of PS. Moreover, the spherical morphology of the inorganic particles is more effective at compatibilizing the polymer blend because the inorganic particles can apply isotropic interaction forces.

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…”

Section: Methodsmentioning

confidence: 99%

Inorganic Particles Contribute to the Compatibility of Polycarbonate/Polystyrene Polymer Blends

TAKAYAMA

2023

Materials

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“…In this study, three-point bending tests were conducted with the specimens placed flatwise. As a result, the deformation in the tensile region can be considered as pure extensional flow deformation with suppressed Poisson’s shrinkage [ 23 ]. Equation (14) provides the yield initiation stress obtained in this case.…”

Section: Discussionmentioning

confidence: 99%

Effect of Carbon Nanofiber Distribution on Mechanical Properties of Injection-Molded Aramid-Fiber-Reinforced Polypropylene

Takayama,

Kobayashi,

Yuasa

et al. 2024

Polymers

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The mechanical recycling of discarded plastic products as resources for environmental preservation has recently gained research attention. In this context, it is necessary to use waste materials for fiber-reinforced thermoplastics (FRTP). Glass and carbon fibers are often damaged by shear and compression during melt-forming processes. To achieve a sustainable society, it is necessary for thermal recycling to produce minimal to no residue and for mechanical recycling to maintain the length of fibers used in FRTP to preserve their performance as a reinforcing agent. Aramid fibers (AFs) do not shorten during the melt-molding process, and their composites have excellent impact strength. On the other hand, plastics reinforced with glass or carbon fibers are reported to have a superior strength and modulus of elasticity compared to aramid fibers. This study investigates the dispersion of a carbon nanofiber (CNF), a whisker, as the third component in aramid-fiber-reinforced polypropylene (PP/AF). The results and discussion sections demonstrate how the dispersion of CNF in PP/AF can enhance the mechanical properties of injection-molded products without compromising their impact resistance. The proposed composition will have excellent material recyclability and initial mechanical properties compared to glass-fiber-reinforced thermoplastics.

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“…With the obtained values of σ fy and E f , the Poisson's ratio υ for the fabricated specimens was calculated using a method outlined by Takayama and Motoyama [25]. The yield initiation stress σ y was then obtained using Equation (3).…”

Section: Three-point Bending Testsmentioning

confidence: 99%

“…Each specimen underwent five three-point bending tests, and the resulting average values for σ fy and E f are presented as the results herein. These mean values were employed to compute the Young's modulus using a method documented by Takayama and Motoyama [25].…”

Section: Three-point Bending Testsmentioning

confidence: 99%

Vickers Hardness Mechanical Models and Thermoplastic Polymer Injection-Molded Products’ Static Friction Coefficients

Takayama

2024

JMMP

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The surface mechanical properties of thermoplastics are crucially important for evaluating molded products’ vulnerability to scratching. Because surface mechanical properties reflect material performance directly in terms of durability and frictional behavior, understanding and modeling them is important for industry and research. This emphasizes the surface mechanical properties of Vickers hardness and the static friction coefficient, with attempts to model them as functions of stress at yield initiation. Vickers hardness can be related to the compressive stress at yield initiation. The static friction coefficient can be modeled as a function of the surface shear strength and Vickers hardness. This research has improved our understanding of thermoplastics’ surface mechanical properties and has enabled the prediction of the scratch performance of molded products and the provision of effective indicators for material design.

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Injection molding temperature dependence of elastic coefficients obtained using three-point bending tests to ascertain thermoplastic polymer coefficients

Cited by 10 publications

References 3 publications

Inorganic Particles Contribute to the Compatibility of Polycarbonate/Polystyrene Polymer Blends

Inorganic Particles Contribute to the Compatibility of Polycarbonate/Polystyrene Polymer Blends

Effect of Carbon Nanofiber Distribution on Mechanical Properties of Injection-Molded Aramid-Fiber-Reinforced Polypropylene

Vickers Hardness Mechanical Models and Thermoplastic Polymer Injection-Molded Products’ Static Friction Coefficients

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