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Burst Strength of Composite Cylinders – Assessment of the Type of Statistical Distribution

  • Georg W. Mair , Ben Becker and Florian Scherer
Published/Copyright: September 28, 2014
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Materials Testing
From the journal Materials Testing Volume 56 Issue 9

Abstract

Composite materials show an extraordinary change of properties depending on service life. This implies the necessity to find tailored methods to determine strength and residual strength of composite cylinders. This determination can be done by load cycle tests [1] or, in some cases, primarily by slow burst tests [2]. The results of both test methods need statistical assessment for the precise description of strength. Especially the statistical assessment of burst related strength properties has a high uncertainty. Sample size [3] and scatter distribution were identified as major influences on uncertainty. It is unclear if a Gaussian normal distribution, a Weibull distribution or others describe the scatter behaviour correctly. An assumption has to be found and confirmed to prevent overestimation of survival rate, respectively reliability, in the interval of one failure per 104 to 108 cylinders.

Kurzfassung

Faserverbundwerkstoffe (Komposite) zeigen außergewöhnliche Veränderungen ihrer Eigenschaften in Abhängigkeit von der Betriebsdauer. Daraus leitet sich auch die Notwendigkeit ab, eine Methode zu finden, die in der Lage ist, Festigkeiten und Restfestigkeiten von Komposit-Druckbehältern zu ermitteln. Dies kann mittels Lastwechselprüfung [1] oder in anderen Fällen vorzugsweise mittels der langsamen Berstprüfung [2] erfolgen. Für eine aussagekräftige Beschreibung der Festigkeit bedürfen die Ergebnisse beider Prüfverfahren einer statistischen Auswertung. Aber insbesondere die statistische Auswertung der berstbezogenen Festigkeitseigenschaften unterliegt neben der Frage der Stichprobengröße [3] einer großen Unsicherheit mit enormen Folgen. Dies ist die Frage, welche Verteilungsfunktion der Streuung der Festigkeitseigenschaft konservativ zugrundegelegt werden darf. So ist zu untersuchen, ob die Gauß‘sche Normalverteilung (NV) die wahre Verteilung richtig beschreibt. Es könnten aber auch andere Funktionen, wie z. B. die Weibull-Verteilung notwendig sein, um eine Überschätzung der Überlebenswahrscheinlichkeit bzw. Zuverlässigkeit in dem interessanten Bereich von einem Ausfall pro 104 bis 108 Druckbehältern zu vermeiden.

*Correspondence Address Dr.-Ing. Georg W. Mair Arbeitsbereich Druckgeräte, Druckgefäße und Treibgasspeichersysteme Division 3.2 BAM Bundesanstalt für Materialforschung und -prüfung Unter den Eichen 44–46, D-12203 Berlin, Germany

Dr.-Ing. Georg W. Mair, born in 1964, studied aeronautical engineering at the Technical University of Berlin and obtained his PhD from the Institute for Light Weight Design at the TU Berlin, Germany in 1995. Since 1996, he has been at BAM Federal Institute of Materials Research and Testing and has been responsible for the section Pressure Receptacles and Fuel Gas Storage Systems of Division 3.2 since 2000. Since 1997, he has been advisor of the ministry of transport on the field of international transport of dangerous goods and storage of gas as propellant.

Dr.-Ing. Ben Becker, born in Rostock in 1979, studied industrial engineering at the University of Rostock, Germany and received his diploma in 2004. He was scientific staff and team leader at the Fraunhofer Institute IPA in the application centre for large structures in production engineering and received his PhD in 2009. From 2010 to 2013, he was project manager and composite expert in the wind energy industry (Suzlon Energy). Since 2014, he has been postdoctoral research fellow at BAM Federal Institute of Materials Research and Testing, in the section Pressure Receptacles and Fuel Gas Storage Systems of Division 3.2.

Dr.-Ing. Florian Scherer, born in 1980, studied mechanical engineering at the Technical University Darmstadt, Germany received his diploma in 2005 and his MSc in 2006. From 2006 until 2012 he was research associate at the TU Berlin, Germany department for combustion engines. Since 2013, he has been research fellow at BAM Federal Institute of Materials Research and Testing in the section Pressure Receptacles and Fuel Gas Storage Systems of Division 3.2.

References

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Published Online: 2014-09-28
Published in Print: 2014-09-01

© 2014, Carl Hanser Verlag, München

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Burst Strength of Composite Cylinders – Assessment of the Type of Statistical Distribution
  5. Effects of Zn/Cu Ratio and Silicon on Microstructure, Mechanical Properties, Tarnish and Corrosion Resistance of As-Cast 940 Silver Alloys
  6. Analysis of the Frequency as an Integral Method for the Testing of Anisotropic 3D Sheet Metal Structure
  7. Mechanical and Thermal Properties of a Cu-CNT Composite with Carbon Nanotubes Synthesized by CVD Process
  8. The Mechanical and Electrical Properties of the Ternary Bi-Ga-Sb System
  9. Experimental Investigation of the Corrosion Mechanism of Cemented Soils in Magnesium Sulfate Solution
  10. Experimental and Analytical Study of Masonry Constructions Reinforced with Bed Joints
  11. The Fracture Toughness of Fe2B Formed on Boronized AISI 304
  12. Effects of Ferroboron and Ferrochromium Powder Addition on Abrasive Wear Resistance of Fe-Based Hardfacing Coatings
  13. Fabrication of Al/Mg Bimetal Compound Casting by Lost Foam Technique and Liquid-Solid Process
  14. Effects of Si and Zn on Machinability and Wear Resistance of AZ91 and AS91 Magnesium Alloys
  15. DIRECTT-Rekonstruktionen im Vergleich zur gefilterten Rückprojektion
  16. Reduzierung von Missing-Wedge-Artefakten der CT mit DIRECTT
  17. Röntgentomografische Untersuchung eines kommerziellen Lithium-Ionen-Kondensators*
  18. Machining Parameter Optimization of Bidirectional CFRP Composite Pipe by Genetic Algorithm
  19. Investigation of Lost Foam Casted Aluminum Bimetal Microstructures
  20. Taguchi-Based Grey Relation Optimization of Machining Parameters and Cutting Path Strategies in CNC Pocket Milling Operations
  21. Reliable Evaluation of Acceptability of Weld for Final Disposal Based on the Canister Copper Weld Inspection Using Different NDT Methods
  22. Evaluation of the Reliability of NDTesting in Russian Railway Transport
  23. Vorschau/Preview
  24. Vorschau
https://doi.org/10.3139/120.110613

Articles in the same Issue

  1. Inhalt/Contents
  2. Inhalt
  3. Fachbeiträge/Technical Contributions
  4. Burst Strength of Composite Cylinders – Assessment of the Type of Statistical Distribution
  5. Effects of Zn/Cu Ratio and Silicon on Microstructure, Mechanical Properties, Tarnish and Corrosion Resistance of As-Cast 940 Silver Alloys
  6. Analysis of the Frequency as an Integral Method for the Testing of Anisotropic 3D Sheet Metal Structure
  7. Mechanical and Thermal Properties of a Cu-CNT Composite with Carbon Nanotubes Synthesized by CVD Process
  8. The Mechanical and Electrical Properties of the Ternary Bi-Ga-Sb System
  9. Experimental Investigation of the Corrosion Mechanism of Cemented Soils in Magnesium Sulfate Solution
  10. Experimental and Analytical Study of Masonry Constructions Reinforced with Bed Joints
  11. The Fracture Toughness of Fe2B Formed on Boronized AISI 304
  12. Effects of Ferroboron and Ferrochromium Powder Addition on Abrasive Wear Resistance of Fe-Based Hardfacing Coatings
  13. Fabrication of Al/Mg Bimetal Compound Casting by Lost Foam Technique and Liquid-Solid Process
  14. Effects of Si and Zn on Machinability and Wear Resistance of AZ91 and AS91 Magnesium Alloys
  15. DIRECTT-Rekonstruktionen im Vergleich zur gefilterten Rückprojektion
  16. Reduzierung von Missing-Wedge-Artefakten der CT mit DIRECTT
  17. Röntgentomografische Untersuchung eines kommerziellen Lithium-Ionen-Kondensators*
  18. Machining Parameter Optimization of Bidirectional CFRP Composite Pipe by Genetic Algorithm
  19. Investigation of Lost Foam Casted Aluminum Bimetal Microstructures
  20. Taguchi-Based Grey Relation Optimization of Machining Parameters and Cutting Path Strategies in CNC Pocket Milling Operations
  21. Reliable Evaluation of Acceptability of Weld for Final Disposal Based on the Canister Copper Weld Inspection Using Different NDT Methods
  22. Evaluation of the Reliability of NDTesting in Russian Railway Transport
  23. Vorschau/Preview
  24. Vorschau
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