Development of Notched Ring Test for Measuring Slow Crack Growth

Material Science SCG # 2006 Washington DC

A novel Notched Ring Test (NRT) method for measuring slow crack growth (SCG) in plastics pipes and fittings is developed and applied to determine its applicability as the standard test method. NRT specimen in the form of a notched full ring, directly obtained from the extruded pipe or injection molded fitting is subjected to a three point bend loading has demonstrated its effectiveness in generating slow crack growth in a time frame of order of magnitude shorter than the currently available methods. Details of NRT method in terms of test implementation, its SCG performance and the stress intensity factor approach to SCG evaluation are presented. Corresponding Author : swchoi@hannam.ac.kr

Please note that the whole article content is available on PPCA website onlySource : 2006 Washington DC


Related papers

ISO 13477 S4 TESTING OF AWWA C900 PVC PIPE

Author(s) : Sunwoong Choi, Tom Marti 2016 Berlin

Small scale, steady state (S4) testing per ISO 13477 is a lab-based procedure to determine the critical pressure at which a fracture will propagate following initiation in a given pipe material filled with a given test medium. The S4 test was originally developed for the natural gas industry using air as the test...

Utilization of Notched Ring Test for larger diameter pipes and fittings

Author(s) : Sooho Pyo, Junghyun Nam, Yoonsang Kim and Sunwoong Choi 2010 Vancouver

The Notched Ring Test (NRT) has been recently developed to measure slow crack growth (SCG) in plastics pipes and fittings. The NRT specimen in the form of a notched full ring is directly obtained from the extruded pipe or injection molded fitting and has demonstrated its effectiveness in generating slow crack growth...

An Alternate Method for Determining the Hydrostatic Design Basis for Plastic

Author(s) : Edwards, Broutman, Choi 2001 Munich

The Alternate Methods Committee of the Plastics Pipe Institute’s Hydrostatic Stress Board (HSB) has completed development of an alternate method for determining the hydrostatic design basis (HDB) for plastic piping materials. The initial work was reported at Plastic Pipes X, in Sweden in 1998.1 An ASTM test method...

Complex Yield Behaviour of PE100 Resin on Plane Strain Tensile Specimen

Author(s) : Choi, Lee, Broutman, Edwards, Palermo, Cho, Choi, Park 2001 Munich

In recently designated plane strain grooved tensile (PSGT) methodology of ASTM F2018 standard, a groove in the direction perpendicular to the loading axis allows biaxial stress state to be generated under a uniaxial loading. The biaxial stress state produced very closely approximates the internally pressurized pipes...

An Alternate Method for Determining the Hydrostatic Design Basis for Plastic Piping Materials

Author(s) : Broutman, Edwards, Shah, Palermo 1998 Gothenburg

The Alternate Methods Committee of the Plastics Pipe Institute's Hydrostatic Stress Board (HSB) has initiated development of an alternate method for determining the hydrostatic design basis (HDB) for plastic piping materials. After reviewing several test methods, the plane-strain tensile method, developed by Choi and...

Predicting long term pipe strength by uniaxial tensile testing

Author(s) : Choi 1995 Edinburgh

A plane strain specimen has been developed which creates a biaxial stress state when loaded in uniaxial tension. A detailed stress analysis of this specimen is presented. The stress state was generated though the use of a groove across the width of the specimen. Both theoretical and experimental results are presented....

Evaluation of Aged Plastics Pipes Used in Natural Gas Distribution Systems

Author(s) : Duvall, Nylander, Broutman 1988 Bath

Thermoplastic gas distribution piping has been utilized in the United States for over 25 years. However, there is little data available on how such materials age in a service environment and how such aging might affect future performance. In this program, polyethylene pipe samples that were removed from actual gas...

Stress cracking in uPVC and high impact pipes in the natural gas distribution network

Author(s) : Mutter & Benjamin 1974 Southampton

Fig, 1 gives the last known figures (1-1-73) of materials used in the Dutch gas network at 8 bar and lower (under supervision of the gas boards). The figure shows that during the last 18 years more than 20,000 km of uPVC pipes have been laid, and that since 1966 about 3,200 km of high impact PVC have been applied. The...

Determination of Interfacial Pressure in Crimped Fitting Assemblies

Author(s) : Choi 2008 Budapest

The Role of Fiber Glass Tape Reinforcement on Hydrostatic Burst Behavior

Author(s) : Pyo 2008 Budapest

Members of the Association

BOREALISBOROUGEINEOS O&PIRPCKorea Petrochemical IND. Co., LTDLyondellBasellPetroChina Dushanzi Petrochemical CompanyPRIME POLYMERSABICSCG Chemicals & Thai PolyethyleneSinopecTASNEE
TOP