Ultra Low Sulfur Diesel (ULSD) Sulfur Test Method Variability: A Statistical Analysis of Reproducibility from the 2005 US EPA ULSD Round-Robin Test Program

Fracture toughness of steels is conventionally measured using bend specimens and provides a conservative estimate of toughness when the actual loading is in tension. There has been widespread interest in characterizing the toughness that occurs with reduced constraint to better reflect constraint conditions typical of a relatively shallow girth weld flaw. There is currently a standardized approach to measure fracture toughness in tension loaded specimens, however, it requires testing of multiple specimens to generate a resistance curve. Recent developments in fracture toughness testing and analysis of tension loaded specimens have led to publications by CANMET and Exxon Mobil Upstream Research Company toward development of a single-specimen procedure. As part of an initiative to enhance the state of the art in strain based design and assessment methods, with the intent of providing support for the standardization of appropriate weld testing methods, BMT under a Pipeline research Council International (PRCI) project has combined the two single-specimen approaches and developed a recommended practice for fracture toughness testing using single-edge-notched tension SENT (or SE(T)) samples with fixed grip loading. The procedure has been assessed by means of a round robin test program involving laboratories from around the world. Girth welds were fabricated and base metal, heat affected zone and weld center line specimens were prepared and sent to round robin participants. For the round robin program all the participants used a double clip gauge arrangement for direct CTOD measurement and electric potential drop measurement or unloading compliance method for crack growth measurement. In this paper, the results of the round robin test program including comparison of J and CTOD resistance curves will be presented and discussed.

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Low Cycle Fatigue of A356-T6 Cast Aluminum Alloy - A Round-Robin Test Program

10.4271/881701 ◽

1988 ◽

Cited By ~ 6

Author(s):

R. I. Stephens ◽

H. D. Berns ◽

R. A. Chernenkoff ◽

R. L. Indig ◽

S. K. Koh ◽

...

Keyword(s):

Aluminum Alloy ◽

Low Cycle Fatigue ◽

Round Robin ◽

Cast Aluminum Alloy ◽

Cycle Fatigue ◽

Cast Aluminum ◽

Test Program ◽

Round Robin Test

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Methanol Vehicle Emissions Round Robin Test Program

10.4271/932773 ◽

1993 ◽

Cited By ~ 2

Author(s):

S. K. Hoekman ◽

T. E. Jensen

Keyword(s):

Vehicle Emissions ◽

Round Robin ◽

Test Program ◽

Round Robin Test

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Round-Robin Study of Asphalt-Concrete Content by Ignition

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/0361198196154300117 ◽

1996 ◽

Vol 1543 (1) ◽

pp. 132-138 ◽

Cited By ~ 1

Author(s):

E. R. Brown ◽

Stuart Mager

Keyword(s):

Extraction Methods ◽

Test Methods ◽

Round Robin ◽

Test Method ◽

Round Robin Test ◽

Asphalt Cement ◽

Accuracy And Precision ◽

Before And After ◽

Asphalt Content ◽

The Difference

The National Center for Asphalt Technology (NCAT) has developed a test method to determine the asphalt content of hot-mix asphalt (HMA) mixtures by ignition. In the ignition method, an HMA sample is subjected to heat of 538°C (1,000°F) in a furnace to ignite and burn the asphalt cement (AC) from the aggregate. The difference in weight of the sample before and after is used to determine the asphalt content of the mixture. The aggregate recovered after ignition testing may then be used for gradation analysis. A round-robin study was completed by NCAT to determine the accuracy and precision of the ignition method. The round-robin test program is discussed, as well as the accuracy and precision values determined for the measured AC content and gradation using the ignition method. The results of the round-robin study indicate that the ignition method can measure the AC content of HMA mixtures with greater precision than solvent-extraction methods, without significantly affecting the gradation of the aggregate. This test method has shown excellent potential for replacing existing test methods for measuring asphalt content.

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