Approximation of Damage Accumulation in Fibre Reinforced Polymers
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Georgi Zachariev
Abstract
A unified approach for the derivation of the known equations describing damage accumulation as a result of loading of fibre-reinforced polymers is proposed. The investigated materials are short glass fibre-reinforced polyoxymethylene (GF/POM) and long glass fibre-reinforced epoxyresin (GFRP). The damage structures themselves consist of the accumulation of additional internal surfaces within the entire material volume as measured by small angle scattering X-ray refractometry. On the basis of the concept for a loading percentage under creep, damage accumulations applying short-term and long-term loading are compared. It is shown that for the investigated materials our approximations by a double exponent function are more effective than the approximations according to Weibull. It is also shown how the coefficients of the double exponent cumulative function can be found.
Kurzfassung
Ein einheitlicher Ansatz zur Herleitung bereits bekannter Gleichungen zur Beschreibung der Schadensakkumulation in faserverstärkten Polymeren unter Belastung wird aufgestellt. Die untersuchten Werkstoffe sind Glas-Kurzfaser-verstärktes Polyoxymethylen (GF/POM) und lang Glasfaserverstärktes Epoxidharz (GFK). Als relevante Schädigung wird die Akkumulation zusätzlicher innerer Oberflächen im Werkstoff angesetzt, wie sie mit dem Kleinwinkel-Streuverfahren der Röntgen-Refraktometrie ermittelt werden. Die Akkumulationen der Schädigung unter Kurz- und Langzeitbelastung werden als Funktion des Belastungsgrads verglichen. Für die untersuchten Werkstoffe sind die Approximationen der Schädigung nach unserer Gleichung mit doppeltem Exponenten erfolgreicher als die der kumulativen Funktion nach Weibull. Es wird auch gezeigt, wie die Koeffizienten der kumulativen Funktion mit doppeltem Exponenten bestimmt werden können.
References
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© 2013, Carl Hanser Verlag, München
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
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- Kalender/Calendar
- Kalender
- Vorschau/Preview
- Vorschau
Artikel in diesem Heft
- Inhalt/Contents
- Inhalt
- Fachbeiträge/Technical Contributions
- Calculation of S-N Curves for Different Mean Stresses on the Basis of “PHYBALmean” for the Quenched and Tempered Steel SAE 4140
- Prüfung linearer Bauteile auf Wälzfestigkeit
- Methods for Polymer Diagnostics for the Automotive Industry*
- A New Design of Hip Prosthesis Coating using Functionally Graded Material
- Approximation of Damage Accumulation in Fibre Reinforced Polymers
- Pt-Rh Alloys: Investigation of Creep Rate and Rupture Time at High Temperatures
- Effect of Alloying Elements on the Tooling Capabilities of High Speed Steels Fabricated by Powder Metallurgy
- Microstructure and Abrasion Wear Resistance of Thermally Sprayed Cermet Coatings
- Influence of Deformation on the Phase Structure of a 30CrMnSi Steel
- Development of Novel Luminescent Materials with High Quality Blue Light-Emitting Properties Based on Zinc Oxides
- Drilling Template Used to Produce Cellular EPS Patterns for the Lost Foam Casting Process
- Kalender/Calendar
- Kalender
- Vorschau/Preview
- Vorschau
