Impact comparative study of phone carcasses behavior by FEM

Cărăușu, Constantin; Plavanescu, Simona; Nedelcu, Dumitru

doi:10.1088/1757-899x/87/1/012100

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…with the radius for the ball R = 3.15 mm, the reduced elastic modulus E r calculated from equation (1) with E s = 213 GPa and ν s = 0.29 for the AISI 52100 SKF bearing steel ball, and L is the applied load. Average values E p = 3.3 GPa (from data in Table 2) and Poisson's ratio ν p = 0.38 (21) were utilized for the specimens. Equation 2gives contact pressure p 0 values of 104, 150, 189, and 224 MPa for applied loads of 1, 3, 6, and 10 N, respectively, as indicated in Table 3.…”

Section: Tribological Characterization 331 Influence Of Applied Loadmentioning

confidence: 99%

Tribological and nanomechanical properties of a lignin-based biopolymer

Broitman¹,

Nedelcu

Mazurchevici

2020

E-Polymers

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A research is reported on the nanomechanics and tribology of the Arboblend V2 Nature biopolymer (a 100% bio-based material, biodegradable, or resistant depending of application), being a mixture of different biopolymers such as lignin, polylactic acid, cellulose, biopolyamides, and other natural additives. The specimens were made by an industrial-scale injection molding machine. The nanoindentation characterization have unveiled that an increase in processing temperature from 160°C to 170°C produces a rise in hardness and elastic modulus of ∼20%. Tribological characterization against a bearing-steel counterface has shown that for both processing temperatures, the increase of the applied load or the increase of sliding speed will produce an increase of the friction coefficient (µ) and wear. At an applied load of 1 N (contact pressure of 104 MPa) and tracks in a direction perpendicular to the surface textured lines, the lowest µ ∼ 0.148 are for samples made T = 170°C, while for tracks parallel to the textured lines, the lowest µ ∼ 0.059 is obtained for samples made at T = 160°C. Experiments made at different ambient humidity have established that friction coefficient is higher at 0% RH or at 75% RH than at 33% RH. Our results show that the biopolymers Arboblend V2 Nature is a candidate to substitute some popular fossil-based thermoplastics in numerous tribological industrial applications.

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Section: Tribological Characterization 331 Influence Of Applied Loadmentioning

confidence: 99%

Tribological and nanomechanical properties of a lignin-based biopolymer

Broitman¹,

Nedelcu

Mazurchevici

2020

E-Polymers

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Tribological and Nanomechanical Behavior of Liquid Wood

Broitman

Nedelcu

Mazurchevici

et al. 2018

Journal of Tribology

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During the last decades, there has been an increased interest in the use of lignin-based composites following the ideas of developing green materials for fossil-based raw materials substitution. The biopolymer Arboform is a mixture of lignin, plant fibers, and additives, which is nowadays successfully used in many applications. As a thermoplastic, it can be molded and is therefore also called “liquid wood.” In this paper, we report a study comparing the nanomechanical and tribological properties of Arboform (AR), and Aramid-reinforced Arboform (AR-AF) composite biopolymers. The samples were produced in an industrial-scale injection molding machine. Nanoindentation experiments have revealed that, in both series of biopolymer samples, an increase in temperature or a change in the injection direction from 0 deg to 90 deg produces an increase in hardness. On the other hand, Young's modulus is slightly affected by the increase in temperature, and not affected by the injection angle. Tribological characterization has shown that all samples, except the AR-AF injected at 175 °C, present noticeable wear and have a similar friction coefficients μ ∼ 0.44–0.49 at Hertzian contact pressures p0 between 90 and 130 MPa. Interestingly, the reinforced polymer produced at 175 °C shows no wear and low friction of μ ∼ 0.19 at p0 = 90 MPa. Our results show that the reinforced Arboform biopolymers are a good candidate to replace other polymers in many mechanical and tribological applications.

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Impact comparative study of phone carcasses behavior by FEM

Cited by 2 publications

References 2 publications

Tribological and nanomechanical properties of a lignin-based biopolymer

Tribological and nanomechanical properties of a lignin-based biopolymer

Tribological and Nanomechanical Behavior of Liquid Wood

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