Characterization of Rapid Gas Decompression Behavior of Pressurized Elastomer Seals

Klaus Lederer

Characterization of Rapid Gas Decompression Behavior of Pressurized Elastomer Seals

Titel in Übersetzung: Characterization of Rapid Gas Decompression Behavior of Pressurized Elastomer Seals

Klaus Lederer

Lehrstuhl für Werkstoffkunde und Prüfung der Kunststoffe (210)

Publikation: Thesis / Studienabschlussarbeiten und Habilitationsschriften › Diplomarbeit

Abstract

Eines der Hauptprobleme beim Einsatz von Elastomeren für Dichtungsanwendungen unter hohen Drücken ist das spröde Versagen durch Auftreten eines rapiden Druckabfalls - auch Explosive Dekompression (ED) genannt. Ziel dieser Arbeit war die Entwicklung und Implementierung einer adäquaten Testmethodik, um das Verhalten von Elastomeren bei explosiver Dekompression zu charakterisieren. Für Tests auf Bauteil- als auch auf Prüfkörperebene wurden FKM (Fluorkarbon-Kautschuk) und HNBR (Hydrogenierter Nitril-Butadien-Kautschuk) eingesetzt. Mit Hilfe optischer Messmethoden konnte ein voll instrumentierter Autoklaventest zur Erfassung der Volumensänderung von O-Ringen, während und vor der explosiven Dekompression entwickelt werden. In einer ausführlichen Parameterstudie wurden die Einflüsse von Temperatur, Druck, Dekompressionsrate, Gas, Einspannung und Mehrfachbelastung auf das ED-Versagen untersucht. Auf Prüfkörperebene ermöglichte ein speziell entwickelter Prüfaufbau die Untersuchung verschiedener für die Explosive Dekompression relevanten Materialeigenschaften wie Kompressions-, Relaxations- und Deformationsverhalten, sowie der thermo-mechanischen Eigenschaften des Materials. Das Risswachstumsverhalten beider Materialien wurde mittels monotoner Zugversuche mit gekerbten Hantelprüfkörpern und SEN-FWPS (single edge notched faint waist pure shear) Prüfkörpern gemessen.

Titel in Übersetzung	Characterization of Rapid Gas Decompression Behavior of Pressurized Elastomer Seals
Originalsprache	Englisch
Qualifikation	Dipl.-Ing.
Betreuer/-in / Berater/-in	Major, Zoltan, Betreuer (intern)
Datum der Bewilligung	30 Juni 2006
Publikationsstatus	Veröffentlicht - 2006

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Schlagwörter

Explosive Dekompression FKM HNBR Elastomer

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title = "Characterization of Rapid Gas Decompression Behavior of Pressurized Elastomer Seals",

abstract = "A phenomenon termed explosive decompression (ED) damage occurs when elastomer seals exposed to high gas pressure fail in a brittle manner upon the sudden release of the gas pressure. The main objective of this thesis was the development and implementation of adequate test methods to characterize the explosive decompression failure resistance of elastomers. Therefore a comprehensive testing methodology was developed. Tests using two different elastomers FKM (Fluorocarbon Rubber) and HNBR (Hydrogenated Nitrile Butadiene Rubber) were performed on a component as well as on a specimen level. A main goal was the implementation of fully instrumented autoclave tests using commercially available O-rings. These tests allowed to gain insight into the mechanisms and kinetics of the explosive decompression failure as functions of material expansion, pressure and temperature were recorded. In addition to instrumented ED tests, a comprehensive parameter test series was performed. Investigated parameters were the ambient gas, test temperature, pressure, decompression rate, O-ring constraints and the influence of multi-cycle loading. On specimen level, a specially developed test set-up using dumbbell specimens allowed the examination of various elements of the explosive decompression process. Apart from that, monotonic tensile tests with pre-cracked FWPS specimens were performed. The tests were analyzed with help of full-field strain analysis and IR-thermograph test systems.",

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AU - Lederer, Klaus

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PY - 2006

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N2 - A phenomenon termed explosive decompression (ED) damage occurs when elastomer seals exposed to high gas pressure fail in a brittle manner upon the sudden release of the gas pressure. The main objective of this thesis was the development and implementation of adequate test methods to characterize the explosive decompression failure resistance of elastomers. Therefore a comprehensive testing methodology was developed. Tests using two different elastomers FKM (Fluorocarbon Rubber) and HNBR (Hydrogenated Nitrile Butadiene Rubber) were performed on a component as well as on a specimen level. A main goal was the implementation of fully instrumented autoclave tests using commercially available O-rings. These tests allowed to gain insight into the mechanisms and kinetics of the explosive decompression failure as functions of material expansion, pressure and temperature were recorded. In addition to instrumented ED tests, a comprehensive parameter test series was performed. Investigated parameters were the ambient gas, test temperature, pressure, decompression rate, O-ring constraints and the influence of multi-cycle loading. On specimen level, a specially developed test set-up using dumbbell specimens allowed the examination of various elements of the explosive decompression process. Apart from that, monotonic tensile tests with pre-cracked FWPS specimens were performed. The tests were analyzed with help of full-field strain analysis and IR-thermograph test systems.

AB - A phenomenon termed explosive decompression (ED) damage occurs when elastomer seals exposed to high gas pressure fail in a brittle manner upon the sudden release of the gas pressure. The main objective of this thesis was the development and implementation of adequate test methods to characterize the explosive decompression failure resistance of elastomers. Therefore a comprehensive testing methodology was developed. Tests using two different elastomers FKM (Fluorocarbon Rubber) and HNBR (Hydrogenated Nitrile Butadiene Rubber) were performed on a component as well as on a specimen level. A main goal was the implementation of fully instrumented autoclave tests using commercially available O-rings. These tests allowed to gain insight into the mechanisms and kinetics of the explosive decompression failure as functions of material expansion, pressure and temperature were recorded. In addition to instrumented ED tests, a comprehensive parameter test series was performed. Investigated parameters were the ambient gas, test temperature, pressure, decompression rate, O-ring constraints and the influence of multi-cycle loading. On specimen level, a specially developed test set-up using dumbbell specimens allowed the examination of various elements of the explosive decompression process. Apart from that, monotonic tensile tests with pre-cracked FWPS specimens were performed. The tests were analyzed with help of full-field strain analysis and IR-thermograph test systems.

KW - Rapid Gas Decompression Explosive Decompression FKM HNBR Fluorocarbon Rubber Hydrogenated Nitrile Butadiene Rubber Autoclave tests

KW - Explosive Dekompression FKM HNBR Elastomer

M3 - Diploma Thesis

ER -