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Materials 2017, 10(12), 1423; https://doi.org/10.3390/ma10121423

Fracture Assessment of PEEK under Static Loading by Means of the Local Strain Energy Density

Department of Industrial and Mechanical Engineering, Norwegian University of Science and Technology, Richard Birkelands vei 2b, 7491 Trondheim, Norway
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Received: 12 October 2017 / Revised: 26 November 2017 / Accepted: 11 December 2017 / Published: 13 December 2017
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Abstract

Polyetheretherketone (PEEK) has gained interest in many industrial applications due to its high strength-to-weight ratio, excellent heat tolerance and high corrosion resistance. Stress concentrators such as notches and geometrical discontinuities are present in many such components necessitating the reliable assessment of notch sensitivity of PEEK in monotonic tension. Here we evaluate the applicability of the strain energy density (SED) approach for the assessment of the fracture strength of experimentally tested notched geometries subject to corrosion. The fracture behavior of neat, circumferentially razor-grooved dog-bone specimens and circumferentially U-notched specimens with different notch radii can be predicted with a discrepancy lower than ±10%. Reliable predictions are shown on two previously published datasets employing both computed and published mechanical properties as inputs for the SED calculations. This report presents the first successful application of SED for PEEK as well as the successful prediction of tensile behavior in corrosive environments. This opens the road towards future applications of PEEK in fields its compliant use is of growing popularity. View Full-Text
Keywords: tensile behavior; PEEK; strain energy density; SED; notch tensile behavior; PEEK; strain energy density; SED; notch
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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MDPI and ACS Style

Peron, M.; Razavi, S.M.J.; Torgersen, J.; Berto, F. Fracture Assessment of PEEK under Static Loading by Means of the Local Strain Energy Density. Materials 2017, 10, 1423.

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