Dynamic flow and failure of confined polymethylmethacrylate

Rittel, D.; Brill, A.

doi:10.1016/j.jmps.2007.09.003

Cited by 60 publications

(50 citation statements)

References 30 publications

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“…There are several glassy polymers that have been extensively studied at high strain rate in the literature, including polymethylmethacrylate (PMMA) [16,95,100,[123][124][125][126][127][128][129][130][131][132], polycarbonate (PC) [15, 18-20, 100, 110, 124, 126, 127, 133-136], polyvinylchloride (PVC) [137,138] and varying classes of epoxy [23,74,[139][140][141]. The large number of studies on a ''single'' material indicates that it is critical to understand the pedigree of the polymer being tested, including processing history and storage.…”

Section: Glassy Amorphous Polymersmentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

285

121

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The mechanical properties of polymers are becoming increasingly important as they are used in structural applications, both on their own and as matrix materials for composites. It has long been known that these mechanical properties are dependent on strain rate, temperature, and pressure. In this paper, the methods for dynamic loading of polymers will be briefly reviewed. The high strain rate mechanical properties of several classes of polymers, i.e. glassy and rubbery amorphous polymers and semi-crystalline polymers will be reviewed. Additionally, time-temperature superposition for rate dependent large strain properties and pressure dependence in polymers will be discussed. Constitutive modeling and shock properties of polymers will not be discussed in this review.

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Section: Glassy Amorphous Polymersmentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

285

121

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“…The brittle-ductile transition in the failure mode has been studied mainly in metals [6,7], but it has been also observed in polymeric materials, such as PolyMethylMethAcrylate (PMMA) [8] and PolyCarbonate (PC) [9]. This phenomenon of transition in the failure mode was analyzed by Kalthoff [6] in steel specimens subjected to dynamic mode-II loading.…”

Section: Introductionmentioning

confidence: 99%

“…Most published analysis [6,8,9], either on metals or polymers, focus on the qualitative description of the phenomenon. Recently, Dolinski et al [7] proposed a damage model applied to metallic materials able to predict this transition.…”

Section: Introductionmentioning

confidence: 99%

“…During its service lifetime, these components can be subjected to dynamic and impact loads, which requires a deeper understanding of the mechanical behavior of these materials under high strain rates, as well as their fracture behavior. Polymeric materials have called the attention from the scientific community [1,2,3,4,5], showing the importance to predict the failure conditions of a component.The brittle-ductile transition in the failure mode has been studied mainly in metals [6,7], but it has been also observed in polymeric materials, such as PolyMethylMethAcrylate (PMMA) [8] and PolyCarbonate (PC) [9]. This phenomenon of transition in the failure mode was analyzed by Kalthoff [6] in steel specimens subjected to dynamic mode-II loading.…”

mentioning

confidence: 99%

“…However, from a certain impact velocity, adiabatic shear bands appear and cracks propagate at a much smaller angle, about 10º. The change in the failure mode, from a mechanism of brittle fracture to a ductile one, is called brittleductile transition in the failure mode.Most published analysis [6,8,9], either on metals or polymers, focus on the qualitative description of the phenomenon. Recently, Dolinski et al [7] proposed a damage model applied to metallic materials able to predict this transition.…”

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confidence: 99%

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Numerical Analysis of the Brittle-Ductile Transition in the Failure-Mode in Polymeric Materials

Aranda-Ruiz

Loya

2014

AMM

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Abstract.In this paper we analyze, using the Finite Element Method, the process of brittle-ductile transition in the failure mode observed in polycarbonate notched specimens under impact loads. In order to analyze this transition we have implemented, through a user subroutine, a damage model which combines a tensional fracture criterion and an energetic, acting simultaneously. The competition between both criteria predicts the difference in material behavior from a critical impact velocity, and how this transition is produced on different planes through the thickness of the specimen. These results show the necessity of employing three-dimensional models for its study. IntroductionThe good relationship between the impact resistance of certain polymeric materials with respect to their weight and cost has prompted its use in the industry over the last decades. During its service lifetime, these components can be subjected to dynamic and impact loads, which requires a deeper understanding of the mechanical behavior of these materials under high strain rates, as well as their fracture behavior. Polymeric materials have called the attention from the scientific community [1,2,3,4,5], showing the importance to predict the failure conditions of a component.The brittle-ductile transition in the failure mode has been studied mainly in metals [6,7], but it has been also observed in polymeric materials, such as PolyMethylMethAcrylate (PMMA) [8] and PolyCarbonate (PC) [9]. This phenomenon of transition in the failure mode was analyzed by Kalthoff [6] in steel specimens subjected to dynamic mode-II loading. He observed that at low impact velocities, the fracture mechanism of cleavage was the dominant, and cracks propagated at an angle of about 70 degrees relative to the plane of the notch. However, from a certain impact velocity, adiabatic shear bands appear and cracks propagate at a much smaller angle, about 10º. The change in the failure mode, from a mechanism of brittle fracture to a ductile one, is called brittleductile transition in the failure mode.Most published analysis [6,8,9], either on metals or polymers, focus on the qualitative description of the phenomenon. Recently, Dolinski et al. [7] proposed a damage model applied to metallic materials able to predict this transition. However, as it has been experimentally observed, the failure modes produced in polymeric materials are similar to those reported by [7], so it might be interesting to extend the proposed methodology to polymers.In this paper, using the Finite Element Method, a full 3D numerical model has been build, to reproduce tests made on PC simple notched specimens [9], incorporating a damage model by means of a user subroutine. This damage model is an extension of the one published by Dolinski et al. [7], to be applicable to polymeric materials, in particular the PC. In the analysis, a special attention to the process of brittle-ductile transition in the failure mode has been paid. The results highlight the distinctly three-dimensional character of the cr...

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Discrete shear failure planes resulting from oblique hypervelocity impacts

Stickle

Schultz

2014

J. Geophys. Res. Planets

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A combination of laboratory and numerical experiments examines the role of shear localization in subsurface damage following very oblique (15-30°) hypervelocity impacts. Laboratory experiments reveal subsurface damage planes ("blades") parallel to the impact trajectory for highly oblique impacts (15-30°), which are characterized by unique surface textures relative to other failure regions. Observations of growth rate and surface texture of the damage planes combined with three-dimensional CTH simulations indicate that the blades are the result of frictional processes during localized shear deformation. Laboratory experiments also reveal that impact angle and projectile failure play a role in the development of these blades: aluminum projectiles result in distinct along-trajectory blades for both 15°and 30°impacts, whereas the blades are weakly developed for Pyrex projectiles and nonexistent for planar polymethylmethacrylate projectiles. The blades form early in the cratering process and are signatures of the projectile momentum being transferred into the target. Based on the growth rate, and melting seen along the surface of these damage planes, the blades may provide an analog for the generation of pseudotachylytes during the early stages of impact crater formation.

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Dynamic flow and failure of confined polymethylmethacrylate

Cited by 60 publications

References 30 publications

High Strain Rate Mechanics of Polymers: A Review

High Strain Rate Mechanics of Polymers: A Review

Numerical Analysis of the Brittle-Ductile Transition in the Failure-Mode in Polymeric Materials

Discrete shear failure planes resulting from oblique hypervelocity impacts

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