Alternative accelerated and short-term methods for evaluating slow crack growth in polyethylene resins with high crack resistance |
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| Affiliation: | 1. LATEP, Polymer Technology Laboratory, Rey Juan Carlos University, Tulipán St., 28933 Móstoles, Madrid, Spain;2. GIQA, Group of Environmental and Chemical Engineering, ESCET, Rey Juan Carlos University, Tulipán St., 28933 Móstoles, Madrid, Spain;1. Polymer Competence Center Leoben GmbH, Roseggerstr. 12, 8700 Leoben, Austria;2. Department of Polymer Engineering and Science, University of Leoben, Austria;1. Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, Shanghai 200237, PR China;2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, PR China;1. Grupo de Durabilidad e Integridad Mecánica de Materiales Estructurales (DIMME), ESCET, Universidad Rey Juan Carlos, C/ Tulipán s/n, 28933 Móstoles, Madrid, Spain;2. Laboratorio de Tecnología de Polímeros (LATEP) – Grupo de Ingeniería Química y Ambiental (GIQA), ESCET, Universidad Rey Juan Carlos, C/ Tulipán s/n, 28933 Móstoles, Madrid, Spain;1. Department of Plastics Technology and Environmental Engineering, Federal Institute of Technology – TGM, 1200 Vienna, Austria;2. Polymer Competence Center Leoben GmbH, 8700 Leoben, Austria;3. Department of Polymer Engineering and Science, University of Leoben, Leoben, Austria |
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| Abstract: | The current market has widely adopted the new polyethylene pipe grade PE 100 RC (resistant to cracks) for pipe applications. However, the main drawback of this material is the long test period (∼10,000 h) required for ranking the resins. This paper proposes a modified Pennsylvania edge-notch tensile (PENT) test with higher load and temperature conditions (2.8 MPa and 90 °C). With the modified PENT test, failure time is six times shorter but slow crack growth is maintained. Additionally, it evaluates and finds an unexpected relationship between the strain hardening modulus and specimen thickness. These results suggest that the 0.30-mm thickness recommended by ISO 18488 is not optimal. Therefore, thicker specimens are proposed for accurate strain hardening modulus determination. Both methods are viable alternatives for evaluating the failure resistance of the new polyethylene pipe grades. |
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| Keywords: | PENT test Strain hardening modulus (SH) Polyethylene Slow crack growth (SCG) |
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