Influence of machining process on the mechanical behaviour of injection-moulded specimens of talc-filled Polypropylene

Codolini, A.; Li, Q.M.; Wilkinson, Andrew

doi:10.1016/j.polymertesting.2017.07.018

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…Recently, Sun et al (2016a) demonstrated the role of the mesoscopic unevenness of cut surfaces in the measured exceptional elastic moduli of ductile and quasi-brittle foam samples prepared by EDM and mechanical cutting processes. Codolini et al (2017) observed similar effect of cut surfaces on the measured mechanical properties of polymers. However, the quantitative correlation between the cut-surface roughness and compressive behaviour of aluminium foams has not been established.…”

Section: Introductionsupporting

confidence: 65%

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Meng

Chai²,

Sun

et al. 2019

European Journal of Mechanics - A/Solids

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Three cutting methods, i.e. electrical discharge machining (EDM), band saw (BS) and water jet (WJ), were used to prepare cuboid samples of closed-cell aluminium Alporas foam. On the end surfaces of the prepared samples, local roughness of mesoscopic structural components (i.e. cell wall, node and facet) and global roughness for the entire cut surface were measured using confocal microscopy. Furthermore, quasi-static uniaxial compression tests were performed with intermittent unloading-reloading. In the initial stage of compression, the measured loading stiffness and unloading elastic modulus are highest, intermediate and lowest for the EDM-cut, BS-cut and WJ-cut samples, respectively. This difference in measured compressive properties has been correlated with the difference in end-surface roughness associated with different cutting methods. However, the peak and plateau of compressive stress and the unloading elastic modulus in the plateau stage are insensitive to cutting method. An analytical model has been developed to elucidate the observed compressive behaviour and shed light on the responsible mechanisms.

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Section: Introductionsupporting

confidence: 65%

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Meng

Chai²,

Sun

et al. 2019

European Journal of Mechanics - A/Solids

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“…The top layer of the material is responsible for the external characteristics of the product, which include increased hardness, scratch resistance, and improved wear resistance [18]. Machine parts made of PP can undergo cutting and fragmentation.…”

Section: Introductionmentioning

confidence: 99%

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

et al. 2020

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In the presented work the influence of different 3MgO·4SiO2·H2O (talc) contents in polypropylene samples on the structure, hardness, elasticity, and friction of the surface layer was investigated. The talc content ranged from 0 to 25 wt.%, and all the samples were obtained in the same conditions by the injection molding process. The analysis of the microstructure was performed by X-ray diffraction. Changes in the hardness and elasticity were determined for three different depths (300, 800, and 4000 nm) using an ultra nano tester. For the purpose of the examination of the friction properties of the obtained compounds, a nano-scratch tester was applied. Increasing the talc content caused growth in the indentation modulus and hardness values. Simultaneously, an effect of decreasing hardness and elastic modulus with increasing indentation depth was observed. The smallest effect size was observed for 25 wt.% talc content, which might suggest that talc addition increased the homogeneity of the observed composites. Scratch tests showed increasing scratch resistance along with increasing talc content for both constant and progressive loads. The growth in talc concentration led to a decrease in the degree of the polypropylene (PP) crystallinity of the surface layer. The exfoliation process occurred in PP composites.

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“…Standard machining processes, such as milling, are still the best suitable for machining polymeric composites since they induce low levels of damage in the machined surface [13]. For these reasons, many work was conducted by the authors in order to understand the behavior of plant fibers inside the composite during the industrial machining process of profile milling [14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Mechanics of material removal when cutting natural fiber reinforced thermoplastic composites

Chegdani

Mansori

2018

Polymer Testing

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID A B S T R A C TThis paper aims to study the machinability of natural fiber reinforced thermoplastic composites by investigating the mechanics of chip formation and the multiscale cut surface's quality induced by the orthogonal cutting process. Unidirectional flax fibers reinforced polypropylene (UDF/PP) composite has been tested by orthogonal cutting experiments. Mechanical tensile and shear tests have been conducted on UDF/PP specimens to relate the mechanical behavior to the cutting behavior. Results show that UDF/PP composites produce a continuous chip at all the considered cutting conditions. This is inherently related to the specific mechanical behavior of flax fibers inside the thermoplastic matrix under cutting solicitations. The cutting behavior induces a consequent surface damages in the form of debonding zones and uncut fiber extremities. Results demonstrate that the cutting depth has the most significant influence on the machinability after sorting the pertinent scales of the cut surface using the multiscale surface analysis approach.

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Influence of machining process on the mechanical behaviour of injection-moulded specimens of talc-filled Polypropylene

Cited by 14 publications

References 7 publications

Cutting-induced end surface effect on compressive behaviour of aluminium foams

Cutting-induced end surface effect on compressive behaviour of aluminium foams

The Structure and Mechanical Properties of the Surface Layer of Polypropylene Polymers with Talc Additions

Mechanics of material removal when cutting natural fiber reinforced thermoplastic composites

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