The influence of microstructure on the failure behaviour of PEEK

Chu, J.; Schultz, J. M.

doi:10.1007/bf00544542

Cited by 24 publications

(11 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, as a crack propagates during mechanical testing, there is microcracking at some points (e.g. impurities or voids) in the region near the crack tip 23 . For CNT‐based composites, there are stress concentrations in the vicinity of the nanotube ends, which could be the sites of microcracking initiation in the matrix material.…”

Section: Resultsmentioning

confidence: 99%

Fracture behaviour of cracked carbon nanotube‐based polymer composites: Experiments and finite element simulations

Kuronuma

Shindo

Takeda

et al. 2010

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

A B S T R A C T This paper studies the fracture behaviour of cracked carbon nanotube (CNT)-based polymer composites by a combined numerical-experimental approach. Tensile tests were conducted on single-edge cracked plate specimens of CNT/polycarbonate composites at room temperature and liquid nitrogen temperature (77 K), and the critical loads for fracture instabilities were determined. Elastic-plastic finite element simulations of the tests were then performed to evaluate the J-integrals corresponding to the experimentally determined critical loads. Scanning electron microscopy examinations were also made on the specimen fracture surfaces, and the fracture mechanisms of the CNT-based composites were discussed.

show abstract

Section: Resultsmentioning

confidence: 99%

Fracture behaviour of cracked carbon nanotube‐based polymer composites: Experiments and finite element simulations

Kuronuma

Shindo

Takeda

et al. 2010

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The mechanical behavior of amorphous and semicrystalline PEEK has been the subject of numerous papers. Some studies have attempted to establish relationships between the microstructure and the mechanical properties of amorphous and semicrystalline PEEK (1)(2)(3). Conversely, the microstructure of PEEK can be illuminated by a study of their mechanical or dielectric relaxations.…”

Section: Introductionmentioning

confidence: 99%

Dynamic mechanical behavior of poly(aryl ether ether ketone) in the −150°C to +100°C temperature range: Influence of the nature of sorbed solvents

Bas

Albérola

1996

Polymer Engineering & Sci

View full text Add to dashboard Cite

The dynamic mechanical behavior of poly(ary1 ether ether ketone) (PEEK) films submitted to various treatments, i.e. physical aging, crystallization, and immersion in various solvents (water and some alcohols), has been investigated at low temperatures in order to give new insights on the origin of the subglass transitions. Two processes, i.e., the simple thermorheological component at lower temperatures and the cooperative component at higher temperatures, are overlapped in the /3 relaxation of dry PEEK. Sorbtion of such solvent molecules as water, ethanol, methanol, and isopropanol gives rise to new relaxations. tric relaxation (probably PI) would be due to a larger 244

show abstract

“…Especially, it is of interest to determine whether there are simple temperature scaling laws for the rate of physical aging phenomena in such a system. Some work has attempted to establish the relationship between the microstructure and the mechanical properties of amorphous and semi-crystalline PEEK 3,9,10) . Accordingly, the microstructure of PEEK can be illuminated by a study of its mechanical or dielectric relaxation.…”

Section: Effect Of Physical Aging On the Microstructure And The Crystmentioning

confidence: 99%

Effect of physical aging on the microstructure and the crystallization of amorphous poly(aryl ether ether ketone ketone) (PEEKK)

Tan

Luo

et al. 1999

Macromol. Chem. Phys.

View full text Add to dashboard Cite

SUMMARY: Physical aging of poly(aryl ether ether ketone ketone) (PEEKK) has been investigated. Heat flow responses were measured after annealing the amorphous samples obtained by quenching the melt into an ice-water bath close to, but below, the glass transition temperature. The extent of aging is related to the supercooling from the glass transition temperature and to the aging time. The activation energy of the aging process, which was estimated by a Williams-Watt expression, is similar in magnitude to that obtained for the cold crystallization for the aged samples. The quenched glass is a metastable glass. The conformation of molecular chains rearranges with physical aging which results in the formation of a denser packing in the amorphous phase. The dense amorphous phase may form an initial nucleus for crystallization. Isothermal cold crystallization of the aged samples was carried out. The Avrami equation was used to determine the kinetic parameters, and the Avrami constant n is about 2. An Arrhenius expression was used to evaluate the activation energy of relaxation upon physical aging and the activation energy of transportation upon isothermal crystallization. The activation energy of relaxation is similar in magnitude to that of crystallization for aged samples. Results obtained are interpreted as kinetic effects associated with the glass formation process.

show abstract

The influence of microstructure on the failure behaviour of PEEK

Cited by 24 publications

References 21 publications

Fracture behaviour of cracked carbon nanotube‐based polymer composites: Experiments and finite element simulations

Fracture behaviour of cracked carbon nanotube‐based polymer composites: Experiments and finite element simulations

Dynamic mechanical behavior of poly(aryl ether ether ketone) in the −150°C to +100°C temperature range: Influence of the nature of sorbed solvents

Effect of physical aging on the microstructure and the crystallization of amorphous poly(aryl ether ether ketone ketone) (PEEKK)

Contact Info

Product

Resources

About