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Morhain, C.; Velasco, José Ignácio

doi:10.1023/a:1017500930544

Cited by 34 publications

(9 citation statements)

References 17 publications

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“…The normalization technique was proposed by Landes and Herrera [30] and has been included in ASTM Standard E1820 for elastic-plastic fracture toughness. Although developed for metals, the normalization technique has been demonstrated to yield equivalent results to multi-specimen methods for a variety of polymers [17,18,[31][32][33][34]. The required data for application of the normalization technique consists of a record of load versus displacement P i Kd i , the initial crack length a 0 , and the final crack length a f .…”

Section: Experimental Methodsmentioning

confidence: 99%

The role of crystalline phase on fracture and microstructure evolution of polytetrafluoroethylene (PTFE)

Brown

Dattelbaum

2005

Polymer

191

107

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Section: Experimental Methodsmentioning

confidence: 99%

The role of crystalline phase on fracture and microstructure evolution of polytetrafluoroethylene (PTFE)

Brown

Dattelbaum

2005

Polymer

191

107

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“…Although platelet exfoliation was not clearly observed for this composite, a slightly better dispersion of the oHT particles could explain this enhancement, the opposite of what was observed for the PS composites. It has been reported that the addition of inorganic particles can increase G Ic of glassy polymers19, 38 and stabilize the crack propagation of semicrystalline polymers showing ductile instability 39–41. In the case of the SAN composite, this remarkable increase in G Ic can be attributed to plastic microdeformation during the fracture onset induced by the oHT platelets.…”

Section: Resultsmentioning

confidence: 96%

“…It has been reported that the addition of inorganic particles can increase G Ic of glassy polymers 19,38 and stabilize the crack propagation of semicrystalline polymers showing ductile instability. [39][40][41] In the case of the SAN composite, this remarkable increase in G Ic can be attributed to plastic microdeformation during the fracture onset induced by the oHT platelets.…”

Section: K Icmentioning

confidence: 99%

Effect of a dodecylsulfate‐modified magnesium–aluminum layered double hydroxide on the morphology and fracture of polystyrene and poly(styrene‐co‐acrylonitrile) composites

Realinho

Antunes

Arencón

et al. 2008

J of Applied Polymer Sci

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Composites of polystyrene (PS) and poly (styrene-co-acrylonitrile) (SAN) containing a fraction of a dodecylsulfate-modified Mg-Al layered double hydroxide (LDH) were prepared by means of a melt-extrusion process. The structure and morphology were analyzed with wide-angle X-ray scattering and transmission electron microscopy, respectively. The X-ray spectra of the PS matrix composite displayed the diffraction peak characteristic of the hybrid LDH basal plane at 2y ¼ 3.1 deg. The SAN matrix composite did not exhibit such a diffraction peak. Both PS and SAN composites displayed an intercalated type of morphology with respect to the LDH platelets, as assessed by transmission electron microscopy. A plasticizing effect due to the hybrid LDH particles was observed for all composites and was supported by a decrease in the glass-transition temperature values and by Fourier transform infrared spectra. Besides tensile properties, the fracture toughness of the composites was compared with that of the pure polymers through the linear elastic fracture mechanics parameters. They were determined from fracture tests under a three-point-bending configuration. The results indicated that the effect of adding a small fraction of modified LDH particles to SAN caused an improvement in fracture toughness of 50% with respect to that of the pure polymer. Moreover, the relative increase in the fracture energy was about 200%. For PS matrix composites, both tensile properties and linear elastic fracture mechanics fracture parameters remained unaffected. These results were explained on the basis of the different plasticities developed by both polymers around the particles.

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“…From the fracture toughness analysis of injection and compression mold grade PP, it was found that the toughness is related to the initial notch depth, sample dimensions, temperature, and deformation rate .The application of linear elastic fracture mechanics (LEFM) to measure the fracture toughness of PP homopolymer is restricted to −60°C because of the excessive nonlinearity at higher temperatures . Therefore, the elastic–plastic fracture mechanics J‐integral method including multiple or single specimen normalization methods and the three‐parameter Weibull process were used at room temperature for PP homo and co‐polymers . Crazing was found as the deformation mechanism for PP homopolymer .…”

Section: Introductionmentioning

confidence: 99%

“…In load bearing and engineering applications for both PP and PE, an improved understanding of fracture behavior along with general strength analysis is considered necessary as it provides information on the crack growth process in the materials that can be directly relevant to their performance in real-world conditions [12]. Fracture toughness measurements using different fracture mechanics approaches and the identification of crack propagation mechanisms have been investigated by previous researchers [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], both for PP and PE, with the research focusing on injection or other molding processes. This type of detailed material analysis is still absent for rotationally molded PE and PP however.…”

Section: Introductionmentioning

confidence: 99%

Fracture toughness of rotationally molded polyethylene and polypropylene

Saifullah¹,

Thomas

Cripps³

et al. 2017

Polymer Engineering & Sci

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In this work, the fracture toughness of rotationally molded polyethylene (PE) and polypropylene (PP) was measured using J integral methods at static loading rates and at room temperature. Two different commercially available rotational molding grades PE and PP were tested in this study which have been used in various rotationally molded products such as small leisure craft, water storage tanks, and so on. Scanning electron microscope (SEM), optical microscope, differential scanning calorimetry (DSC), solidstate nuclear magnetic resonance (solid-state NMR), and X-ray scattering were used to investigate the microstructure, fracture surfaces, and compare toughness properties of these materials. In PE, higher molecular weight and broader molecular weight distribution, larger amorphous and crystal region thicknesses are found to be related to higher toughness values. High molecular weight favors higher number of entanglements that improve fracture energy and broader distribution increases long chain branching of higher molecular weight fractions which creates higher entanglements at the branch sites. Larger amorphous regions promote microvoiding more easily compared to thinner amorphous regions, leading to greater plastic deformation and energy absorption. Higher crystal thickness also contributes to microvoiding in the amorphous region. For PP, greater plastic deformation observed in the fracture surfaces is related to higher fracture toughness values. POLYM. ENG. SCI., 58:63-73, 2018.

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Cited by 34 publications

References 17 publications

The role of crystalline phase on fracture and microstructure evolution of polytetrafluoroethylene (PTFE)

The role of crystalline phase on fracture and microstructure evolution of polytetrafluoroethylene (PTFE)

Effect of a dodecylsulfate‐modified magnesium–aluminum layered double hydroxide on the morphology and fracture of polystyrene and poly(styrene‐co‐acrylonitrile) composites

Fracture toughness of rotationally molded polyethylene and polypropylene

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