Geometrieunabhängige bruchmechanische Werkstoffkenngrößen - Voraussetzung für die Zähigkeitscharakterisierung von Kunststoffen

Grellmann, W.; Seidler, Sabine; Lach, Ralf

doi:10.1002/1521-4052(200106)32:6<552::aid-mawe552>3.0.co;2-o

Cited by 6 publications

References 4 publications

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Characterization of the fracture behavior of glass fiber reinforced thermoplastics based on PP, PE‐HD, and PB‐1

Schoßig¹,

Grellmann²,

Mecklenburg³

2009

J of Applied Polymer Sci

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This article deals with the influence of the polymeric matrix, such as isotactic polypropylene (iPP), polyethylene (PE-HD), and isotactic polybutene-1 (iPB-1), and the glass fiber content on the material behavior of short glass fiber reinforced thermoplastics. The glass fiber content of all materials ranged between 0 and 50 wt %, which corresponds to a volume content between 0 and approx. 0.264. To describe the mechanical properties of all materials, the stiffness, strength, hardness, and toughness behavior were determined. The crack toughness behavior regarding unstable crack propagation was also assessed by applying fracture mechanics concepts. It was found that the energy-determined J-values for the PP material system reach their maximum at a glass fiber content of 0.135. In contrast, the crack toughness of the PE-HD materials increases continuously with increasing glass fiber content due to the unchanged deformation ability at simultaneously increasing strength. The toughness level of the PB-1 materials is nearly the same independent of the glass fiber content due to the opposite trend of the load and the deformation ability.

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Characterization of the fracture behavior of glass fiber reinforced thermoplastics based on PP, PE‐HD, and PB‐1

Schoßig¹,

Grellmann²,

Mecklenburg³

2009

J of Applied Polymer Sci

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Fracture toughness of polymers in the ductile‐to‐brittle transition region: Statistical approach and lower bound determination

Cocco

Frontini

Ipiña

2005

J Polym Sci B Polym Phys

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A method available in literature was adapted and proposed for treating scatter and nonlinearity effects in fracture toughness of polymers in the ductile‐to‐brittle transition regime. The materials used were polypropylene homopolymer (PPH) and a polypropylene‐elastomeric polyolefin blend (PPH/POes 20 wt %), at room temperature and at 20‐mm/min test rate. Under such conditions, the fracture toughness presents a large scatter and a mean value can not be used as a design parameter because it leads to toughness overestimation. Then, there is a need to find a threshold of toughness, as a safe characteristic value for design. The toughness was evaluated by using the J‐integral approach. Large sets of specimens, 53 samples per each material, were tested with the purpose to reveal a reliable tendency in fracture behavior. As the toughness was considered nonuniform throughout the material, a weakest link model was assumed, and then results were analyzed statistically by means of a three‐parameter Weibull model (3P‐W). The PPH responded well to this 3P‐W model, whereas some deviations from the original model were observed in the PPH/POes blend. However, lower‐bound toughness values could be determined for both materials by censoring nonvalid data (Δa > 0.1b0). From an engineering point of view, the results are very encouraging, since this methodology allows to obtain a threshold of fracture toughness from a given population, that is suitable to characterize the material fracture toughness at a given temperature and strain rate. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 3674–3684, 2005

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Fracture Toughness Measurements in Engineering Plastics

Grellmann,

Seidler

2022

Polymer Testing

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Geometrieunabhängige bruchmechanische Werkstoffkenngrößen - Voraussetzung für die Zähigkeitscharakterisierung von Kunststoffen

Cited by 6 publications

References 4 publications

Characterization of the fracture behavior of glass fiber reinforced thermoplastics based on PP, PE‐HD, and PB‐1

Characterization of the fracture behavior of glass fiber reinforced thermoplastics based on PP, PE‐HD, and PB‐1

Fracture toughness of polymers in the ductile‐to‐brittle transition region: Statistical approach and lower bound determination

Fracture Toughness Measurements in Engineering Plastics

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