Our site uses cookies necessary for its proper functioning. To improve your experience, other cookies may be used: you can choose to disable them. This can be changed at any time via the Cookies link at the bottom of the page.


Cyclic CRB tests - A quick and reliable tool for ranking of PE pipe grades [PE]

 

Plastic Pipes Conference Association # 2010 Vancouver

G.Pinter

Different polyethylene pipe grades and lots were investigated with a fracture mechanics procedures under cyclic loads. The cyclic tests with Cracked Round Bars allowed a ranking of the different materials concerning crack resistance as a function of failure time as well as of crack initiation time within one week at room temperature. The ranking corresponded to the expectations based on the molecular and morphological properties of the materials. Moreover a lab internal reproduction series with tests on different machines and operators based on a first draft of a testing protocol proved the reproducibility of the results.

Please note that the whole article content is available on PPCA website only :

Related papers

2021 Amsterdam : FROM MULTILAYER LAMINATES TO INDUSTRIAL PIPE APPLICATIONS – A GUIDELINE

Author(s) : Gerald Pinter, Johannes Wiener, Florian Arbeiter, Abhishek Tiwari, Otmar Kolednik

For pipe applications, catastrophic failure due to crack growth has to be prevented by all means. Techniques to develop new and even tougher pipe materials are explored in this contribution. The aim is to create a multi-layer architecture, that exhibits high toughness as well as damage tolerance towards sharp notches....

2021 Amsterdam : INVESTIGATING THE INFLUENCE OF CHANGES IN MOLECULAR STRUCTURE OF POLYAMIDE 12 GRADES ON THE RESISTANCE AGAINST SLOW CRACK GROWTH

Author(s) : Mario Messiha, Britta Gerets, Jan Heimink, Andreas Frank, Florian Arbeiter, Gerald Pinter

A majority of field failure of viscoelastic plastic pipes can be attributed to slow crack growth (SCG) and has become crucial in terms of characterization of newly developed materials – particularly, if they are designed for pressurized pipe applications. In this study, investigations in terms of SCG resistances...

2021 Amsterdam : MULTILAYER POLYMER PIPES – THE INFLUENCE OF RESIDUAL STRESS ON FATIGUE LIFETIME

Author(s) : Lukas Travnicek, Pavel Hutar, Jan Poduska, Andreas Frank, Florian Arbeiter, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik

The application of recycled material in pressure piping systems has been considered lately – it was suggested, that the recycled polyethylene could be used as a part of a multilayer pipe together with virgin material. This type of pressure pipes is not availableon the market yet, so their properties can be only...

2021 Amsterdam : SLOW CRACK GROWTH RESISTANCE OF REPROCESSED PVC

Author(s) : Andreas Frank, Mario Messiha, Günter Dreiling, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Stuart Ramella, Frank Krause, Rudi Berning, Philippe Gabriëls, Alpay Aydemir, Thomas Koch, Florian Arbeiter, Gerald Pinter

The Cyclic Cracked Round Bar (CRB) Test has been applied to study the slow crack growth (SCG) resistance of virgin, recycled, and reprocessed PVC-U. This fracture mechanical test allows a quick ranking of the SCG resistance of PVC-U. A clear correlation between the K-value and the SCG resistance has been elaborated....

2018 Las-Vegas : Aging mechanism of polyethylene pipe material in chlorine dioxide and hypochlorite solution

Author(s) : Márton Bredács, Andreas Frank, Amaia Bastero, Alex Stolarz, Gerald Pinter

Accelerated aging experiments by the immersion of a commercial polyethylene (PE) pipe grade in 10 ppm of chlorine dioxide (ClO2) and in 100 ppm of hypochlorite (HOCl) solution at 60 °C were performed. An additional immersion test was conducted in 1 ppm of ClO2 at 40 °C. The exposure parameters were continuously...

2018 Las-Vegas : Biomimetic design concepts for the pipe architecture of tomorrow

Author(s) : Gerald Pinter, Florian Arbeiter, Johannes Wiener, Andreas Frank, Otmar Kolednik

In order to further increase the fracture toughness of pipes, biomimetic layer design of the pipe wall can be used. Therein, soft polymer interlayers can act as crack-arresters in a matrix of stiffer and inherently more brittle polymers. The effectiveness of the crack arresting role of soft interlayers in a...

2018 Las-Vegas : Determination of the slow crack growth resistance of PA12 pipe grades

Author(s) : Mario Messiha, Andreas Frank, Isabelle J. Berger, Jan Heimink, Hermann van Laak, Florian Arbeiter, Gerald Pinter

Since the last decade polyamide 12 (PA12) has been successfully introduced as material for SDR 11 gas piping systems up to 18 bar, representing itself as an attractive alternative to steel pipes for high-pressure applications. Practical experience has confirmed that beside the higher strength, PA12 pipe grades ...

2018 Las-Vegas : Investigation of the failure behavior of polyethylene electrofusion sockets

Author(s) : Isabelle J. Berger, Andreas Frank, Gerald Pinter, David Nitsche, Dirk Petry

Electrofusion (EF) sockets constitute a well-established and practically proven technology for the joining of polyethylene (PE) pressure pipes. As for the pipes, the potential lifetime of such welding connections is beside other properties also depending on the resistance against slow crack growth (SCG). The current...

2018 Las-Vegas : Multilayer polymer pipes - Possible utilization of recycled material

Author(s) : Pavel Hutar, Jan Poduska, Pavol Dlhy, Andreas Frank, Jaroslav Kucera, Jiri Sadilek, Gerald Pinter, Lubos Nahlik

This paper investigates possible use of recycled material as a part of a multilayer polyethylene pressure pipe system. Crack propagation in different configurations is simulated. Lifetimes of pipes containing recycled material are calculated. Results are compared with lifetimes of pipes made of virgin...

2018 Las-Vegas : Slow crack growth resistance of non-virgin polymers

Author(s) : Andreas Frank, Isabelle J. Berger, Mario Messiha, Carl-Gustaf Ek, Norbert Schuler, Jens-Martin Storheil, Erwin Mayrbäurl, Steve Heeley, Frank Krause, Lodewijk Niemöller, Philippe Gabriëls, Yogesh S. Deshmukh, Florian Arbeiter, Thomas Koch, Gerald Pinter

In order to improve the circular economy of polymers in terms of sustainability and reduced carbon footprint, the increased use of recyclates has become a topic of major importance. Due to their long design lifetimes, pipe applications represent an excellent opportunity to create added value to non-virgin polymers....

2016 Berlin : Fast comparison of different polymeric pipe materials: extending the use of the cyclic CRB- test (ISO 18489)

Author(s) : G. Pinter, F. Arbeiter, A. Frank

The cyclic cracked round bar test has recently been added as a full-fledged ISO standard (ISO 18489) for comparison of polyethylene pipe grade materials’ slow crack growth resistance. However, possibilities of this test are yet far from being exhausted. Seeing, that polyethylene is only used in approximately 30% of...

2016 Berlin : Implementation of a new chlorine dioxide device for accelerated aging of polyolefin pipe materials

Author(s) : Márton Bredács, Anita Redhead, Andreas Frank, Amaia Bastero, Gerald Pinter

To maintain the high quality of potable water chlorine based disinfectants are frequently dosed into the drinking water network. Considering the oxidative nature of these species their long-term impact on the aging of polyolefin pipes is a matter of interest. In this study four polyolefin pipe grades were objected to...

2016 Berlin : Lifetime prediction of PE100 and PE100-rc pipes based on slow crack growth resistance

Author(s) : Andreas Frank, Isabelle J. Berger, Florian Arbeiter, Pavel Hutař, Gerald Pinter

Due to the high slow crack growth resistance of modern polyethylene pipe grades a reliable lifetime assessment of pipes with focus on stage II failure has become challenging. The current paper presents a scientific approach for a fracture mechanics lifetime prediction based on Cyclic Cracked Round Bar (CRB) Tests....

2016 Berlin : Polypropylene multi-layer-pipes - 100 year lifetime assessment using linear elastic fracture mechanics

Author(s) : Univ.-Prof. DI Dr. mont. Gerald PINTER, DI Florian ARBEITER

Applying scientifically well established and investigated linear fracture mechanic methods (LEFM) the kinetics of the slow crack growth (SCG) on polypropylene layers and coextruded interfaces on multi-layer-pipes could be investigated. Taking effects of ageing and stress relaxation during the service lifetime into...

2016 Berlin : Residual stress distribution in the extruded polyolefin pipes

Author(s) : Pavel Hutař, Jan Poduška, Jaroslav Kučera, Eva Nezbedová, Andreas Frank, Jiří Sadílek, Gerald Pinter

Residual stresses can significantly influence the lifetime of polymer pipes. Therefore, realistic estimation of residual hoop stress can contribute to accurate lifetime estimations. The previously used “accurate method” is quite time consuming and needs a lot of specimens to be prepared and treated. A simplified...

2014 Chicago : Characterization of Crack Initiation and Slow Crack Growth Resistance of PE100 and PE100-RC pipe Grades with Cyclic Cracked Round Bar Tests

Author(s) : Andreas Frank, Isabelle J. Berger, Florian Arbeiter, Gerald Pinter

During the past years the Cyclic Cracked Round Bar (CRB) Test has been developed and meanwhile standardized as a new and modern test method for a quick material ranking of polyethylene pipe grades by their resistance against slow crack growth (SCG). As an additional benefit this test method allows a very precise...

2014 Chicago : Correlation of Fracture Mechanics Based Lifetime Prediction and Internal Pipe Pressure Tests

Author(s) : Gerald Pinter, Florian Arbeiter, Isabelle J. Berger, Andreas Frank

An extrapolation to static conditions for an accelerated fracture mechanics lifetime prediction of pressurized polyethylene pipes was conducted. The main objective of the current paper was to correlate predicted pipe lifetimes to real failure times determined with internal pipe pressure tests and to study the...

2014 Chicago : Polypropylene Multi Layer Pipe Lifetime Assessment Under Realistic Loading Conditions

Author(s) : Florian Arbeiter, Martin Ševčík, Gerald Pinter, Frank Andreas, Pavel Hutař

Multi-layer pipes made from polypropylene have been widely used in sewerage applications for several years. Due to good material properties and generally low mechanical loads not many critical failures occur. Aim of this work is to determine, whether slow crack growth, consisting of crack initiation and crack growth,...

2014 Chicago : Prediction of residual lifetimes of small diameter polyethylene pipes

Author(s) : Márton Bredács, Andreas Frank, David Nitsche, Andreas Riha, Gerald Pinter

Within this paper the property and lifetime profile of four small diameter PE water pipes for house supply, which were installed between 1968 and 1992 in Vienna and Graz, Austria, were studied. Based on thermo analytical and structure analytical test methods the materials show still expected values for PE even after...

2012 Barcelona : Accelerated investigation of the effect of chlorine dioxide on the long-term failure behavior and the material aging of polyethylene for raised temperature resistance

Author(s) : A. Redhead, A. Frank, G. Pinter

Keywords : polyethylene for raised temperature resistance, chlorine dioxide, oxidative resistance, degradation, embrittlement Two different polyethylene pipe grades for raised temperature resistance (PE-RT) and one PE100 grade were investigated concerning their resistance to chlorine dioxide. Conventional test...

Members of the Association

BOREALISBOROUGEFormosa Plastics CorporationHanwha TotalEnergiesINEOS O&PIRPCKorea Petrochemical IND. Co., LTD (KPIC)LyondellBasellORLEN UnipetrolPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE