PSI - Issue 33

ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

Procedia Structural Integrity 33 (2021) 443–455

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract Since its first meeting in 1985, ESIS TC4 has held regular semiannual meetings with between 15 and 35 participants, has organized a series of conferences (the first in 1994, then triennial since 1999) and has developed six ISO test standards on the fracture of polymers, polymer composites and adhesives with another two currently going through ISO standardization and ballots, and several more under development. The activities have also resulted in publications, including two books and two review papers. Initial activities focused on round robins providing test methods for determination of fracture properties for, e.g., technical data sheets, quality assurance, materials selection, or materials development and optimization and materials modelling. These procedures defined standard specimens, test rigs and test conditions. For polymers, standards for specific ranges of loading rate and for composites and adhesively bonded joints, procedures for different loading modes and mode mixes were developed. Recently, standard composite specimens with unidirectional fiber orientation were shown to overestimate the delamination resistance of multidirectional laminates under cyclic fatigue loading. First round robin data from the environmental stress cracking tests show the potential for discriminating between the different susceptibilities of polymers to environmentally induced fracture. Future activities will include elastomeric materials, simulation and modelling in combination with experiments or prediction of fracture behavior. Another topic of recent interest concerns digital tools, e.g., image analysis, automated data acquisition, data fitting and analysis. Guidelines on how to best reduce extrinsic scatter and eliminate human errors will improve the data quality. IGF26 - 26th International Conference on Fracture and Structural Integrity 35 years of standardization and research on fracture of polymers, polymer c mposites and adhesives in ESIS TC4: Past achievements an futur directions Andreas J. Brunner a* , Laurent Warnet b** , Bamber R.K. Blackman c* a Retired Scientist, P.O. Box 645, CH-8052 Zürich, Switzerland b University of Twente, Faculty of Engineering Technology, Horst Complex N208, P.O. Box 217, 7500 AE Enschede, The Netherlands c Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK * ESIS TC4 Co-chair, ** ESIS TC4 Secretary Abstract Since its first meeting in 1985, ESIS TC4 has held regular semiannual meetings with between 15 and 35 participants, has organized a series of conferences (the first in 1994, then triennial since 1999) and has developed six ISO test standards on the fracture of polymers, polym r composites and adhesive with another two currently go through ISO stand r ization and ballots, and several more under dev lopmen . The activities have also resulted in public tions, including two books and two eview papers. Initial activiti focused on round robi s providing test methods for determinatio of fracture properties for, e.g., technical data he ts, quality assuranc , materials sele tion, or materials development and optim zation and materials modelling. These p ocedures def ned tandar specimens, test rigs and test conditi n . For polymers, standards for specif c rang s of loading rate and for composite and adhesively bonded joints, procedures for diff rent loading modes a od mixes w re develop d. Recently, standard composite specimens with unidirectional f ber orientati n w e hown to overestimate the delamin tion resist ce f multidirectio al laminat s under cyclic fatigue loading. First round r bin data from the environ ental st ss cracking tests show the potential f r discrim nating between the different susc p ib lities of polymers t nvironm ntally induced fracture. Future activ t es will include ela tom ri materi ls, simulation and m delling combination with experiment or predi t on of fracture behavior. Another top c of recent inter st concerns digital tools, e.g., image analysis, automated da acquisition, d ta fitting and nalys s. Guidelines on how to best reduce extrinsic scatter and elimi ate hu an err rs ll im rove the data quali y. Keywords: Fracture testing of polymers, polymer composites and adhesives; standardizaton; fracture mechanics design; digital tools; IGF26 - 26th International Conference on Fracture and Structural Integrity 35 years of standardization and research on fracture of polymers, polymer composites and adhesives in ESIS TC4: Past achievements and future directions Andreas J. Brunner a* , Laurent Warnet b** , Bamber R.K. Blackman c* a Retired Scientist, P.O. Box 645, CH-8052 Zürich, Switzerland b University of Twente, Faculty of Engineering Technology, Horst Complex N208, P.O. Box 217, 7500 AE Enschede, The Netherlands c Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London SW7 2AZ, UK * ESIS TC4 Co-chair, ** ESIS TC4 Secretary

Keywords: Fracture testing of polymers, polymer composites and adhesives; standardizaton; fracture mechanics design; digital tools;

* Corresponding author E-mail address: andreas.brunner@empa.ch

* Corresponding author E-mail address: andreas.brunner@empa.ch

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.051 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo