Simulation of plastic deformation localization in composite materials with hard inclusions

Ласко, Г. В.; Deryugin, Ye. Ye.; Schmauder, Siegfried

doi:10.1016/s0927-0256(02)00388-9

Cited by 6 publications

(7 citation statements)

References 5 publications

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“…For quasi-brittle materials-materials that are neither plastic nor brittle at the usual engineering length scale-failure is often caused by nonlinear phenomena, such as fracture, damage localization, and frictional shearing, that occur at weak spots in the internal material structure. These weak spots coincide, for example, with interfaces among particles in particulate materials (Dvorkin et al 1994), weak matrix layers in composites with hard inclusions (Lasko et al 2003), and compliant interfaces between stiff material grains (Kulkarni et al 2009), and they are typically characterized by a specific geometry and characteristic size d; spacing ℓ; and orientation ( Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

High-Order Microplane Theory for Quasi-Brittle Materials with Multiple Characteristic Lengths

Cusatis

Zhou

2014

J. Eng. Mech.

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The heterogeneous internal structure of quasi-brittle materials governs several aspects of their behavior, especially in the nonlinear range. Size and spacing of weak spots (e.g., aggregate-matrix interfaces, flaws, and slip planes) where failure is likely to occur are two of the most important material characteristic lengths that can be used to characterize the micro-and meso-structure of these materials. Discrete (lattice and particle) models can be conveniently used to directly model these geometrical features, but they tend to be computationally expensive, and consequently, the derivation of macroscopic continuum-based approximations is often highly beneficial. The current study demonstrates that the continuum macroscale approximation of discrete fine-scale models leads naturally to a high-order microplane theory characterized by multiple characteristic lengths. The average weak spot spacing is shown to be associated with strain gradient effects; whereas the average weak spot size is shown to be associated with the Cosserat characteristics of the theory. The formulated microplane theory is compared with and contrasted to classical continuum theories available in the literature. Finally, for strain softening, known in the case of first-order local formulations to cause strain localization in an unrealistic vanishing size volume, a localization limiter capable of enforcing the minimum localization size to be of a finite value is formulated, exploiting the spectral wave propagation analysis approach.

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Section: Introductionmentioning

confidence: 99%

High-Order Microplane Theory for Quasi-Brittle Materials with Multiple Characteristic Lengths

Cusatis

Zhou

2014

J. Eng. Mech.

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“…In each blend system, the degree of mixing of the blend having a morphology of hard domain/soft matrix (such as the 40/60 or the 20/80 PMMA/nylon 6,6 compositions and the 35/65 or the 17/83 nylon 6/EVA compositions) is better than that of the blend having a morphology of hard matrix/soft domain (such as the 80/20 or the 60/40 PMMA/nylon 6,6 compositions and the 35/65 or the 55/45 nylon 6/EVA compositions). The above results have been predicted by using the unified theory for adhesion4 in conjunction with a new rheological theory for multicomponent blends. The new rheological theory and its applications will be discussed in a future study.…”

Section: Resultsmentioning

confidence: 76%

“…The first method is to mix a hard second‐phase (inclusion) material, such as glass fiber, mineral fillers, and hard polymer inclusions, into a polymer matrix. This method effectively raises the modulus value of the plastics 4, 5. The second method is to blend a soft second‐phase material, such as soft polymer inclusions and plasticizers, into the polymer matrix.…”

Section: Introductionmentioning

confidence: 99%

A new composition–processing–property relationship for studying the tensile modulus‐phase plastic blends

Jodeh

2011

J of Applied Polymer Sci

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Based on thermodynamic principles, a composition-processing-property relationship for predicting the modulus properties of multiphase plastic blends has been developed. This relationship describes the relative modulus of the blend in terms of the volume fraction and the index for the degree of mixing of an inclusionpolymer in the matrix-polymer. The relative modulus is defined as the ratio between the modulus of the blend and that of the matrix polymer. These blends include a nylon 6,6/polymethyl methacrylate(PMMA) system mixed using an injection molding process arid a nylon 6/ ethylene-vinyl acetate copolymer system mixed using a corotational extrusion process. Based on the values determined for the mixing index of the nylon 6,6/PMMA blends, a relationship between the mixing index and the fill time used in the injection molding has been developed. The results also imply that the degree of mixing of the blend mixed using a correlation extrusion process is better than that of the blend processed using an injection molding process. Using the above results, we now can scientifically develop new plastic blends and design optimum processing conditions for various automotive applications.

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“…Das thermomechanische Verhalten und die Versagensmechanismen dieser Werkstoffgruppe wurden in den vergangenen Jahren ausführlich diskutiert [7,8]. Hervorzuheben sind dabei das unterschiedliche thermomechanische Verhalten der Gefügebe-standteile sowie der komplexe Eigenspannungszustand makroskopischer und mikroskopischer Natur.…”

Section: Werkstoffcharakterisierungunclassified

Oberflächenschädigung von Walzenkörpern

Reip¹,

Krempaszky

Renhof

et al. 2004

Materialwissenschaft Werkst

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The surface quality of hot rolled strip is determined by the condition of the roll surface. The mechanisms leading to surface detoriation were studied with particular reference to the thermomechanical induced stress field near the roll surface, which is responsible for the initiation and the growth of microcracks, leading to so-called banding.Studies on specimens taken from a work roll used in a hot strip mill show the extent of surface-damage. Studies by light-and electronmicroscopy reveal the mechanism responsible for surface detoriation. The conclusions drawn are manifested further by analytical and numerical calculations of the stress fields in the work roll.

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Simulation of plastic deformation localization in composite materials with hard inclusions

Cited by 6 publications

References 5 publications

High-Order Microplane Theory for Quasi-Brittle Materials with Multiple Characteristic Lengths

High-Order Microplane Theory for Quasi-Brittle Materials with Multiple Characteristic Lengths

A new composition–processing–property relationship for studying the tensile modulus‐phase plastic blends

Oberflächenschädigung von Walzenkörpern

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