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3D Stress Fields Versus Void Distributions Ahead of a Notch Tip for Semi-crystalline Polymers

Laiarinandrasana, L.; Selles, N.; Cheng, Y.; Helfen, L. 1; Morgeneyer, T. F.
1 Institut für Photonenforschung und Synchrotronstrahlung (IPS), Karlsruher Institut für Technologie (KIT)


The creep durability of engineering structures relies on the theory of Fracture Mechanics for Creeping Solids (FMCS). The studied material is a semi-crystalline polymer. The lifespan of plastic pipes being generally specified in terms of years of service, its prediction requires reliable constitutive models accounting for time dependent deformation under multiaxial stress states and failure criteria based on the mechanisms of damage and failure. Here, an experimental approach was developed so as to analyze the mechanisms of deformation and cavitation at the microstructural scale by using 3D imaging (tomography/laminography). Three stress triaxiality ratios were addressed using various notched specimen geometries. The void characteristic dimensions (volume fraction, height and diameter) were then measured by defining a volume of interest. The spatial distributions of these characteristics at a prescribed creep time were observed to be dependent on the stress triaxiality ratio. A finite element constitutive model using the porosity as an internal variable, was selected. Comparison of the multiscale experimental database with those simulated at the macroscopic scale as well as at the microstructure level was satisfactory. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000095158
Veröffentlicht am 11.06.2019
DOI: 10.1016/j.prostr.2018.12.367
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2452-3216
KITopen-ID: 1000095158
HGF-Programm 56.03.10 (POF III, LK 01) Material a. Processes f. Energy Technol.
Erschienen in 22nd European Conference on Fracture, ECF 2018; Metropol PalaceBelgrade; Serbia; 25 August 2018 through 26 August 2018. Ed.: A. Sedmak
Verlag Elsevier
Seiten 1751-1755
Serie Procedia Structural Integrity ; 13
Nachgewiesen in Scopus
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