Round-Robin Testing of Fracture Toughness Characteristics of Thin-Walled Tubing

2009 ◽  
pp. 205-205-22
Author(s):  
S. K. Yagnik ◽  
N. Ramasubramanian ◽  
V. Grigoriev ◽  
C. Sainte-Catherine ◽  
J. Bertsch ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Round Robin ◽  
Thin Walled

Round-Robin Testing of Fracture Toughness Characteristics of Thin-Walled Tubing

2008 ◽  
Vol 5 (2) ◽  
pp. 101140 ◽  
Author(s):  
S. K. Yagnik ◽  
N. Ramasubramanian ◽  
V. Grigoriev ◽  
C. Sainte-Catherine ◽  
J. Bertsch ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Round Robin ◽  
Thin Walled

ATLANTIC 13B ALLOY

Alloy Digest ◽  
1976 ◽  
Vol 25 (1) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
High Strength ◽  
Heat Treating ◽  
Casting Alloy ◽  
Silicon Bronze ◽  
Thin Walled ◽  
Engineering Corporation ◽  
Bronze Casting

Abstract ATLANTIC 13B Alloy is a silicon bronze casting alloy offering excellent castability and corrosion resistance, good machinability and medium-high strength. It is an all-purpose alloy that is suitable for gears, valve parts and marine fittings. It is especially useful in stress-corrosion environments for thin-walled parts. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and fatigue. It also includes information on corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: Cu-307. Producer or source: Atlantic Casting and Engineering Corporation.

ZA-27

Alloy Digest ◽  
1977 ◽  
Vol 26 (10) ◽  
Keyword(s):  
Fracture Toughness ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
General Purpose ◽  
Corrosion And Wear ◽  
Heavy Section ◽  
Thin Walled ◽  
Aluminum Copper Alloy ◽  
Lower Material

Abstract ZA-27 is a zinc-aluminum-copper alloy that offers exceptionally high strength (58,000 to 64,000 psi tensile strength as cast) at modest cost. It performs best in thin-walled castings (down to 0.10 inch) which means reduced weight and lower material costs when castings are redesigned. It is similar to the general-purpose ZA-12 alloy (Alloy Digest Zn-31, September 1977) except for its higher strength and elongation, but with higher casting temperatures and poor heavy-section castability. This datasheet provides information on composition, physical properties, hardness, tensile properties, and shear strength as well as fracture toughness and creep. It also includes information on corrosion and wear resistance as well as casting, forming, heat treating, machining, and surface treatment. Filing Code: Zn-32. Producer or source: Eastern Alloys Inc.. See also Alloy Digest Zn-50, June 1990.

Fracture Toughness Testing for Improving the Safety of Gas Pipelines

2016 ◽  
Vol 821 ◽  
pp. 464-470
Author(s):  
Ľubomír Gajdoš ◽  
Martin Šperl
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Fracture Mechanics ◽  
Mechanical Tests ◽  
Internal Stresses ◽  
Pipe Material ◽  
Cylindrical Wall ◽  
Fracture Toughness Testing ◽  
Toughness Testing ◽  
Thin Walled

For standard fracture mechanical tests flat specimens (principally CT or SENB) are required. When investigating fracture mechanical properties of thin – walled pipes this brings about a problem because it is necessary to straighten pipe bands. However, this operation causes internal stresses to be induced not only in the semi-product subjected to straightening but also in finished specimens. A question therefore arises to what extent are then the magnitudes of the fracture toughness determined representative for the actual cylindrical wall. To solve this problem fracture mechanics tests were caried out on flat (straightened) CT specimens as well as on curved CT specimens with the natural curvature. The R – curves as well as the resulting parameters of the fracture toughness, obtained for both types of CT specimens, were compared and it was concluded that the fracture toughness of the pipe material determined on straightened CT specimens was practically the same as that obtained on curved CT specimens.

Standardization of SENT (or SE(T)) Fracture Toughness Measurement: Results of a Round Robin on a Draft Test Procedure

2016 ◽  
Author(s):  
Sanjay Tiku ◽  
Nick Pussegoda ◽  
Morvarid Ghovanlou ◽  
W. R. Tyson ◽  
Aaron Dinovitzer
Keyword(s):  
Fracture Toughness ◽  
Test Procedure ◽  
Potential Drop ◽  
Round Robin ◽  
Single Specimen ◽  
Test Program ◽  
Round Robin Test ◽  
Fracture Toughness Testing ◽  
Growth Measurement ◽  
Toughness Testing

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.

Fracture Toughness of HSLA Coiled Tubing Used in Oil Wells Operations

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
J. Wainstein ◽  
J. Perez Ipiña
Keyword(s):  
Fracture Toughness ◽  
Low Cycle Fatigue ◽  
Oil Industry ◽  
Arc Length ◽  
Cycle Fatigue ◽  
Steel Tubes ◽  
Small Thickness ◽  
Coiled Tubing ◽  
Thin Walled ◽  
Tubing Material

Coiled Tubings are thin walled steel tubes of 25–89 mm diameter and thousands meters long, used in the oil industry for production and maintenance services. They suffer plastic deformation during unwinding of the reel, passing through a goosneck arch guide and an injector unit. Strain levels are of 2–3%, making the tubing fail by low cycle fatigue in around 100 wrap–unwrap cycles. As coiled tubing material generally behaves in a ductile manner at surface and down well temperatures, the R curve has to be known to make instability analyses. J-R curves were determined to characterize the fracture toughness of nonused coiled tubing, using nonstandard specimens due to difficulties with their small thickness and diameters. Different crack lengths and crack locations were tested to analyze the 2C0/W ratio and the influence of the longitudinal weld. The R curves obtained show crack arc length dependence and are influenced by the position of the longitudinal weld.

scholarly journals Results of the Fracture Toughness Test Round Robin on Ceramics

1991 ◽  
Vol 99 (1149) ◽  
pp. 417-422 ◽  
Author(s):  
Hideo AWAJI ◽  
Tatsuya YAMADA ◽  
Hiroshi OKUDA
Keyword(s):  
Fracture Toughness ◽  
Round Robin ◽  
Fracture Toughness Test ◽  
Toughness Test

A Round Robin Program of Master Curve Evaluation Using Miniature C(T) Specimens — 2nd Report: Fracture Toughness Comparison in Specified Loading Rate Condition

2013 ◽  
Author(s):  
Masato Yamamoto ◽  
Kunio Onizawa ◽  
Kentaro Yoshimoto ◽  
Takuya Ogawa ◽  
Yasuhiro Mabuchi ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Master Curve ◽  
Loading Rate ◽  
Round Robin ◽  
Surveillance Program ◽  
Similar Amount ◽  
Test Technique ◽  
Rate Condition ◽  
Data Points

Master Curve approach for the fracture toughness evaluation is expected to be a powerful tool to ensure the reliability of long term used RPV steels. In order to get sufficient number of data for the Master curve approach coexistent with the present surveillance program for RPVs, the utilization of miniature specimens, which can be taken from broken halves of surveillance Charpy specimens, is important. CRIEPI had developed the test technique for the miniature C(T) specimens (Mini-CT), whose dimensions are 4 × 10 × 10 mm, and verified the basic applicability of the Master Curve approach by means of Mini-CT and larger specimens for the determination of fracture toughness of typical Japanese RPV steels. A round robin program was organized with the participation of a university, industries and a government institute in Japan. The first-round test results (PVP2012-78661[1]) with limited number of reference temperature To data points indicated the possible loading rate dK/dt dependence in To. However, increasing number of data points in second-round test, which was conducted in specified loading rate of 0.5 MPa m0.5 /sec, ensures that there is no clue of such a remarkable dK/dt dependency. Concerning the effect of large plastic deformation on dK/dt, dK/dt calculated by several definitions were compared with each other. Maximum one order difference was found between dK/dts with and without consideration of plastic deformation. dK/dt - T0 relationships showed similar amount of scatter in T0 regardless of dK/dt definitions. Difference in dK/dt definition seems less effective on scatter of T0 in the present results.

Fatigue Parameters of Cement-Based Composites with Various Types of Fibres

2009 ◽  
Vol 417-418 ◽  
pp. 129-132 ◽  
Author(s):  
Stanislav Seitl ◽  
Zbyněk Keršner ◽  
Vlastimil Bílek ◽  
Zdeněk Knésl
Keyword(s):  
Fracture Toughness ◽  
Cyclic Loading ◽  
Fracture Mechanics ◽  
Building Material ◽  
High Performance ◽  
Static Load ◽  
High Performance Concrete ◽  
Thin Walled ◽  
Point Bend

The paper introduces the basic fracture mechanics parameters of advanced building material – cement-based composites with various types of fibres, prepared as high performance concrete/mortar developed by ZPSV, a.s. company for production of thin-walled panels/elements. To this end three-point bend specimens with starting notch were prepared and tested under static (load–deflection diagram, effective fracture toughness) and cyclic loading (fatigue parameter – Wöhler curve). The experimentally obtained results of cement-based composites are compared and the suitability of these types composites for its application are discussed.

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