The effect of interfacial adhesion on the mechanism for craze formation in polystyrene-glass bead composites

Dekkers, Mej Marijn; Heikens, Derk D

doi:10.1007/bf00544152

Cited by 54 publications

(26 citation statements)

References 12 publications

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“…As known from previous studies [1,3], at an excellently adhering glass sphere a craze forms near the pole of the sphere in the region of maximum dilatation, A~ and of maximum principal stress, ~. A shear band forms near the surface of the sphere at an angle of 45 ~ from the pole in the region of maximum l~rincipal shear stress, z~, and of maximum distortion strain T1 Figure 7 Dependence of major principal stress (el), major principal shear stress (q), dilatation (A) and distortion strain energy density (Wd) near the interfacial crack tip of a completely unbonded sphere on the resistance to interfacial slip.…”

Section: Criteria For Craze Formation and Shear Band Formationmentioning

confidence: 61%

“…Areal craze growth in isotropic glassy polymers has been reported to occur along a path such that the major principal stress always acts perpendicular to the craze plane [15]. A craze that originates near the pole of an excellently adhering glass sphere in a PS matrix expands into the matrix in the direction perpendicular to the applied tension [1]. The directions of the major principal stress and of the applied tension indeed coincide near the pole of a completely bonded sphere.…”

Section: Planar Orientation Of Craze Growthmentioning

confidence: 99%

“…Consequently, plastic deformation processes such as craze formation and shear band formation being at those inclusions. In recent studies the mechanisms for craze formation [1,2] and shear band formation [3] were investigated at small glass spheres (diameter about 30#m) embedded in matrices of, respectively, polystyrene (PS) and polycarbonate (PC) which were subjected to uniaxial tension. These microscopic studies have revealed the profound effect of the degree of interfacial adhesion on the mechanisms for craze and shear band formation.…”

Section: Introductionmentioning

confidence: 99%

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Stress analysis near the tip of a curvilinear interfacial crack between a rigid spherical inclusion and a polymer matrix

Dekkers

Heikens

1985

J Mater Sci

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Craze and shear band formation at poorly adhering glass spheres in matrices of glassy polymers are known to be preceded by the formation of a curvilinear interfacial crack between sphere and matrix. In this study the axisymmetric finite element method has been used to analyse the stress situation near the tip of a curvilinear interfacial crack formed between a rigid spherical inclusion and a polymer matrix upon an applied uniaxial tension. Important factors that determine the stress state near the crack tip were found to be the crack length, the orientation of the crack tip with regard to the tension direction and the extent of interfacial slip between the inclusion and matrix. The results of the analyses were compared with the physical reality of craze and shear band formation at poorly adhering glass spheres. Reasonable agreement was found with respect to both the maximum interfacial crack length that can be reached until a craze or shear band forms at the crack tip and the planar orientation of craze growth perpendicular to the direction of the major principal stress.

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Section: Criteria For Craze Formation and Shear Band Formationmentioning

confidence: 61%

Section: Planar Orientation Of Craze Growthmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Stress analysis near the tip of a curvilinear interfacial crack between a rigid spherical inclusion and a polymer matrix

Dekkers

Heikens

1985

J Mater Sci

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“…"1/3 II plays a crucial role [1,2,19]. In view of the importance of the competition between yielding and crazing in the matrix on the fracture toughness of a rubber blend, it is useful therefore to understand the development of hydrostatic stresses in the matrix around a void (as an idealization of a cavitated rubber particle).…”

Section: Stressmentioning

confidence: 99%

Studies on the growth of voids in amorphous glassy polymers

Steenbrink

Giessen

1998

Journal of Materials Science

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Numerical studies are presented of the localized deformations around voids in amorphous glassy polymers. This problem is relevant for polymer-rubber blends once cavitation has taken place inside the rubber particles. The studies are based on detailed finite element analyses of axisymmetric or planar cell models, featuring large local strains and recent material models that describe time-dependent yield, followed by intrinsic softening and subsequent strain hardening due to molecular orientation. The results show that plasticity around the void occurs by a combination of two types of shear bands, which we refer to as wing and dog-ear bands, respectively. Growth of the void occurs by propagation of the shear bands, which is driven by orientational hardening. Also discussed is the evolution of the local hydrostatic stress distribution between voids during growth, in view of possible craze initiation.

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“…In recent studies the mechanisms for craze formation [4,5] and shear band formation [6] were investigated at small glass beads (diameter about 30 #m) embedded in matrices of, respectively, polystyrene and polycarbonate which were subjected to uniaxial tension. These studies have provided a good insight into the threedimensional stress situation required to start craze and shear band formation as well as into the effect of interfacial adhesion on the mechanisms for craze and shear band formation.…”

Section: Introductionmentioning

confidence: 99%

Crazing and shear deformation in glass bead-filled glassy polymers

Dekkers

Heikens

1985

J Mater Sci

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The competition between craze formation and shear band formation at small glass beads embedded in matrices of glassy polymers has been investigated. This has been done by performing constant strain rate tensile tests over a wide range of strain rates and temperatures, and examining the deformation pattern formed at the beads with a light microscope. The glassy polymers under investigation were polystyrene, polycarbonate, and two types of styrene-acrylonitrile copolymer. It was found that besides matrix properties, strain rate and temperature, the degree of interfacial adhesion between the glass beads and the matrix also has a profound effect on the competition between craze and shear band formation: at excellently adhering beads craze formation is favoured, whereas at poorly adhering beads shear band formation is favoured. This effect is caused by the difference in local stress situation, craze formation being favoured under a triaxial stress state and shear band formation under a biaxial stress state. The kinetics of crazing and shear deformation have also been studied, using a simple model and Eyring's rate theory of plastic deformation. The results suggest that chain scission may be the ratedetermining step in crazing but not in shear deformation.

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The effect of interfacial adhesion on the mechanism for craze formation in polystyrene-glass bead composites

Cited by 54 publications

References 12 publications

Stress analysis near the tip of a curvilinear interfacial crack between a rigid spherical inclusion and a polymer matrix

Stress analysis near the tip of a curvilinear interfacial crack between a rigid spherical inclusion and a polymer matrix

Studies on the growth of voids in amorphous glassy polymers

Crazing and shear deformation in glass bead-filled glassy polymers

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