Étude expérimentale des propriétés mécaniques et morphologiques dans un tube de gaz en HDPE-80

Kiass, N.; Khelif, Rabia; Bounamous, B.; Amirat, Abdelaziz; Chaoui, Kamel

doi:10.1051/meca:2006056

Cited by 4 publications

(6 citation statements)

References 33 publications

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“…Typical properties of HDPE-100 and HDPE-80 polymers are provided in Table 1 [18]. The experimental tests following standard orthogonal table L9 (3) 3 were performed on two HDPE pipes 400 mm length each [20][21][22]. The HDPE-100 pipe had an outside diameter of 200 mm whereas the HDPE-80 had an outside diameter of 125 mm.…”

Section: Experimental Approachmentioning

confidence: 99%

“…Due to the nature of polymeric materials, polyethylene with excellent short-term mechanical strength can have poor long-term performance due to environmental stress cracking [14][15][16]. Manufacturing techniques do affect the mechanical behavior of HDPE in terms of elastic modulus, tensile strength and residual stresses [7,17,[19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Cutting parameters effects on the machining of two high density polyethylene pipes resins

Kaddeche

Chaoui²,

Yallese³

2012

Mechanics & Industry

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The market demand for machining and cutting of various plastics parts is in continuous increase. The aim of this study is to extract prediction laws for surface roughness, cutting forces and temperatures evolution during the machining of two polyethylene pipes grades (HDPE-100) and (HDPE-80). It was found that feed rate is the most prevailing factor on roughness criteria and that better surfaces are obtained during the machining of the harder HDPE-80 resin. Also, cutting speed improved surface quality for speeds up to 200 m.min −1 but the rising interface temperature caused surface damage and material rapid softening. Also, feed exponents, in mathematical models, were found to be 3 to 4 times higher than those of cutting speed and depth of cut. An increase in the cutting speed led to a gradual reduction for the 3 cutting forces components (Fr, Fa and Fv ) with a dominance of the tangential force (Fv ). As expected, the value of the depth of cut had a large influence on the temperature within the cutting zone. This temperature is slightly higher during the machining of HDPE-80 compared to that of HDPE-100 most probably because of hardness differences. The analysis of variance (ANOVA) was performed to check the adequacy of the mathematical models relating cutting parameters with roughness, cutting forces and global cutting zone temperature.

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Section: Experimental Approachmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cutting parameters effects on the machining of two high density polyethylene pipes resins

Kaddeche

Chaoui²,

Yallese³

2012

Mechanics & Industry

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“…In addition, each prepared specimen possess the particularity of having one machined side (turned or bored) and one extruded side (outer or inner pipe surface). 35,41 It is found that the recorded liquid sorption percent is different from one side to the other. Indeed it reached 2.2% in the inner layer and 1.9% in the outer layer.…”

Section: Dot 3 Oil Sorption By Hdpe Materialsmentioning

confidence: 98%

“…28 The mechanical parameters of Toluene-Methanol (TM) mixtures' effects on outer (OL) and inner (IL) pipe surface layers suggest that OL are rapidly degraded. 35 Usually, the analyzed structures imply important plasticization activities in the amorphous zones lowering the stress components. In addition, both LDPE and HDPE exposed to NG condensate exhibited the same type of plasticization.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Alimi,

Chaoui

2024

Journal of Elastomers & Plastics

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High Density Polyethylene (HDPE) is one attractive technical option for the transportation and distribution of natural gas and hydrocarbons given the advantages in long-term mechanical strength, lifespan, maintenance costs and resistance to chemical aging. This study investigates the compatibility of extruded pipe material from copolymerized HDPE-80 with DOT 3 brake fluid. Machined standard specimens from inner (IL) and outer (OL) pipe layers are aged in commercial synthetic polyglycol-based oil for 7 days at laboratory conditions. The percent mass changes are +2.2% and +1.9% respectively for IL and OL pipe surfaces. These results are in the same range of published sorption data for other oils and fuels. Stress-strain parameters (E, σ y, σ CD, σ f, ε y, Δ ε CD, ε f) and fracture work are established and thoroughly discussed for both pipe sides. For IL, the reduction of E, σ y and ε f are respectively 28.0%, 13.9% and 22.7%, while for OL they are 22.6%, 7.7% and 25.1%. Globally, it is concluded that strength properties degradation in DOT 3 oil is more important for IL compared to OL. There is an important loss of ductility for both pipe sides. Ageing caused IL crystallinity ( Xc) to increase while OL showed inverse results probably because of frozen anti-oxidants in the outer surface layers following water quenching during extrusion. Before and after ageing, the as-received OL is found to be more resilient to oxidation than corresponding IL, as higher OIT parameters are also shown in the case of crude oil compatibility investigations. DOT 3 brake oil seem to accelerate the degradation of HDPE-80 thermal stability with a higher intensity for IL.

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“…When considering temperature, the most secure case is given for 32°C which is a well-accepted upper bound by plastic pipe standards. (h) filaments, continuously machined in a given direction, and are used to study mechanical and structural heterogeneities across pipe wall imparted by manufacturing processes [4,[15][16][17]. Non-standard geometries are usually studied for specific applications and once technically approved by major pipe users; preliminary standards are prepared and put into standardized investigations to promote them as new standards.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing of testing specimens from tough HDPE-100 pipe: Turning parameters optimization

Mammeri,

Chaoui,

Bouacha

2023

Res. Eng. Struct. Mat.

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Numerous machining operations are required in order to manufacture standard and non-standard specimens for mechanical testing of polymers. The present work focuses on the machinability of HDPE-100 pipe to prepare the utmost regular filaments with specified thickness and width. The study is set to establish mathematical correlations between surface quality (total roughness; Rt), cutting temperature (T°), filament uniformity (L) and corresponding cutting conditions. The latter include Vc (cutting speed), f (feed rate) and ap (depth of cut), combined with tool geometry (i.e., rake angle: γ and cutting-edge angle: κr). A mixed Taguchi L18 plan is adopted to organize and process the experimental runs. ANOVA and RSM (Response Surface Methodology) are employed to construct prediction models and optimize subsequent machining results. It is found that T (cutting temperature) and surface roughness criteria (Ra, Rt) are strongly affected by f and Vc. In addition, ANOVA results related to the height of filament bends (L) are likewise studied as a function of tool angles γ and κr. It is noted that cutting process is influenced by κr as it explains ~19% contributions of the total variation of parameter L, while γ, Vc and f show a little influence. It is deduced that optimum input parameters, represented by Vc, f, ap, γ and κr, are respectively 160 m/min, 0.5 mm/rev, 4 mm, (-6°) and 90° when turning tough HDPE material.

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Étude expérimentale des propriétés mécaniques et morphologiques dans un tube de gaz en HDPE-80

Cited by 4 publications

References 33 publications

Cutting parameters effects on the machining of two high density polyethylene pipes resins

Cutting parameters effects on the machining of two high density polyethylene pipes resins

Compatibility study of high density polyethylene grade 80 gas pipe with synthetic polyglycol-based brake oil

Manufacturing of testing specimens from tough HDPE-100 pipe: Turning parameters optimization

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