Deformation behaviour of coextruded multilayer composites with polycarbonate and poly(styrene-acrylonitrile)

Gregory, Bryan; Siegmann, A.; Im, James S.; Hiltner, A.; Baer, E.

doi:10.1007/bf01160765

Cited by 52 publications

(30 citation statements)

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“…With the values reported by Gregory et al (1987) of ε f ≈ 0.04 and σ f ≈ 75 MPa this yields ∆ cr c /l c ≈ 0.015. From the micrographs in Fig.…”

Section: Cohesive Surface Modeling Of Crazing and Failuresupporting

confidence: 59%

“…The remaining, less significant parameters are adopted from (Estevez et al, 2000) and the values used in the present work are summarized in Table 2. In the tensile tests reported on PC/SAN multilayer composites failure of PC did not proceed by crazing but by brittle rupture after it had undergone large plastic stretching (Gregory et al, 1987). Beyond a stretch of about 2, i.e.…”

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 96%

“…While the latter was taken constant in the numerical studies by Tijssens et al (2000) and Estevez et al (2000Estevez et al ( , 2005 there is strong evidence -from experiments as well as theoretical models (Gregory et al, 1987;Sung et al, 1994;Basu et al, 2005) -that the craze stress vs. craze widening displays a hardening-like behavior. Here we assume a linear evolution of the craze widening resistance with the inelastic separation…”

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 99%

“…Haward and Young, 1997;Estevez et al, 2000Estevez et al, , 2005. In order to calibrate the model from a macroscopic point of view we make use of experimental results by Gregory et al (1987) and Sung et al (1994). In tensile tests on neat SAN they observed the first appearance of crazing at about 1-2 % strain and a stress level of 40-50 MPa while ultimate brittle failure took place at 3-4 % strain and around 70-80 MPa.…”

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 99%

“…A relatively recent method of producing materials with a heterogeneous microstructure which hinders the unlimited growth of crazes is multilayer coextrusion of two different glassy polymers. The mechanical performance of such materials with a well defined composition of multiple microlayers of PC and SAN has been investigated experimentally by Gregory et al (1987), Sung et al (1994), Kerns et al (2000); see also (Im et al, 1991). For tensile loading parallel to the layers, it was found that the overall elastic stiffness of these composites clearly (and as expected) follows a "rule of mixtures" but the nonlinear deformation and especially the fracture behavior does not.…”

Section: Introductionmentioning

confidence: 99%

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Computational modeling of deformation mechanisms and failure in thermoplastic multilayer composites

Seelig

2008

Composites Science and Technology

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To cite this version:Th. Seelig. Computational modeling of deformation mechanisms and failure in thermoplastic multilayer composites. Composites Science and Technology, Elsevier, 2009, 68 (5), pp.1198. <10.1016/j.compscitech.2007.07.017>. C o m p u t a t i o n a l m o d e l i n g o f d e f o r m a t i o n m e c h a n i s m s a n d f a i l u r e i n t h e r m o -p l a s t i c m u l t i l a y e r c o m p o s i t e s T h . S e e l i g P I I : S 0 2 6 6 -3 5 3 8 ( 0 7 ) Accepted Manuscript AbstractThe deformation and failure behavior of composites consisting of multiple alternating layers of a brittle and a ductile amorphous thermoplastic polymer is controlled by the interaction between crazing and shear banding and displays a brittle-to-ductile transition depending on the composition. In order to gain a better understanding of these interrelations in PC/SAN multilayer composites numerical simulations are performed and compared with experimental observations. The set-up of the computational problem utilizes constitutive models for the large strain viscoplastic behavior of glassy polymers as well as a cohesive surface methodology describing the localized formation, growth and breakdown of crazes. The simulations well reproduce the strong dependence of the mode of failure on the relative layer thickness and help to explain how the latter determines whether the composites display a ductile overall response or undergo localized brittle failure by the coalescence of microcracks.

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“…With the values reported by Gregory et al (1987) of ε f ≈ 0.04 and σ f ≈ 75 MPa this yields ∆ cr c /l c ≈ 0.015. From the micrographs in Fig.…”

Section: Cohesive Surface Modeling Of Crazing and Failuresupporting

confidence: 59%

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 96%

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 99%

Section: Cohesive Surface Modeling Of Crazing and Failurementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Computational modeling of deformation mechanisms and failure in thermoplastic multilayer composites

Seelig

2008

Composites Science and Technology

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Toughening polycarbonate with core-shell structured latex particles

Tanrattanakul

Baer

Hiltner

et al. 1996

J. Appl. Polym. Sci.

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The toughness as a function of temperature of polycarbonate modified by blending with coreshell structured latex particles was evaluated. Comparisons were made among a commercial core-shell latex (MBS), other core-shell (CS) latexes that incorporated a single component rubbery core, and a new class of interpenetrating polymer network (IPN) core-shell latexes with two elastomers in the core. Notched tensile tests differentiated among the blends in terms of their toughness. The most effective modifier at low temperatures was the commercial MBS latex. The CS latexes produced blends that were only slightly less tough than the MBS blends despite better dispersion of MBS and better adhesion to the matrix. The IPN blends were the least tough at low temperatures; however, at 25OC, a blend with IPN had the highest impact strength. Differences between CS and MBS blends were attributed to differences in the percent of butadiene-containing rubber and the chemical nature of the shell. A comparison among the CS latexes showed that increasing the acrylonitrile content of the shell increased the toughness, and increasing the rubber content or the gel fraction of the core increased the toughness.

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Multiple cracking of rigid platinum film covering polymer substrate

Волынский

Баженов

Лебедева

et al. 1999

J. Appl. Polym. Sci.

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Multiple cracking of a thin platinum film deposited on polyethylene terephtalate, isoprene rubber, and natural rubber substrates under tensile deformation was studied by light and scanning electron microscopy. The cover fractures on several fragments elongated in the direction perpendicular to the loading direction. The width of the fractured platinum fragments depends on the thickness of the deposited layer and applied tensile stress. A semiempirical equation describing the average width of the cover fragments was obtained. Appearance of a wavy pattern on an originally smooth surface of composites with rubberlike polymer substrate was observed. The mechanism of the appearance of the surface wave is a mechanical buckling instability of the cover under compressive force.

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Deformation behaviour of coextruded multilayer composites with polycarbonate and poly(styrene-acrylonitrile)

Cited by 52 publications

References 5 publications

Computational modeling of deformation mechanisms and failure in thermoplastic multilayer composites

Computational modeling of deformation mechanisms and failure in thermoplastic multilayer composites

Toughening polycarbonate with core-shell structured latex particles

Multiple cracking of rigid platinum film covering polymer substrate

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