Influence of internal volumetric imperfections on the tearing resistance curve of welded Single Edge notched Tension (SENT) specimens

2022 ◽  
Vol 259 ◽  
pp. 108162
Author(s):  
Vitor Adriano ◽  
Wim De Waele ◽  
Eleine Cardon ◽  
Matthieu N. Boone ◽  
Stijn Hertelé
Keyword(s):  
Resistance Curve ◽  
Single Edge ◽  
Tearing Resistance

Fracture resistance curve for single edge notched tension specimens under low cycle actions

2019 ◽  
Vol 211 ◽  
pp. 47-60 ◽  
Author(s):  
Tianyao Liu ◽  
Xudong Qian ◽  
Wei Wang ◽  
Yiyi Chen
Keyword(s):  
Fracture Resistance ◽  
Resistance Curve ◽  
Single Edge

Fracture Toughness of X100 Pipe Girth Welds Using SE(T) and SE(B) Tests

2012 ◽  
Author(s):  
Dong-Yeob Park ◽  
William R. Tyson ◽  
James A. Gianetto ◽  
Guowu Shen ◽  
Robert S. Eagleson
Keyword(s):  
Crack Length ◽  
Initial Crack ◽  
Opening Angle ◽  
Single Edge ◽  
Double Pass ◽  
Crack Propagation Resistance ◽  
Loading Mode ◽  
Post Test ◽  
Girth Welds ◽  
Tearing Resistance

Extensive single-edge notched tension (SE(T)) and single-edge notched bend (SE(B)) tests were performed to apply the SE(T) procedure developed at CANMET and the standard SE(B) procedure of ASTM E1820 to pipeline girth welds as a contribution to a broader project on strain-based design (SBD) for pipeline girth weld integrity. Specimens were precracked from the pipe inner surface to target lengths of 3 and 6 mm to represent surface-breaking weld flaws of single- and double-pass height, respectively. It was found that resistance curves for weld metal (WM) were much lower than those for base metal (BM) or heat affected zone (HAZ) specimens even though the WM strength overmatched the BM, owing to effects from the WM microstructure. The small crack-tip opening angle observed in post-test WM specimens was consistent with the low crack propagation resistance, which in turn results in small tearing resistance, TR. In general, toughness decreases with increase in initial crack length. J values and tearing resistance are found to be influenced by loading mode; toughness is higher in tension, SE(T), than in bending, SE(B) for a given crack length and test temperature.

Influence of Small Volumetric Flaws on the Measurement of Crack Growth and Tearing Resistance in SENT Tests

2020 ◽  
Author(s):  
Vitor Adriano ◽  
Eleine Cardon ◽  
Wim De Waele ◽  
Stijn Hertelé ◽  
Matthieu Boone
Keyword(s):  
Crack Opening ◽  
Gas Metal Arc Welding ◽  
Measurement Techniques ◽  
Welding Parameters ◽  
Resistance Curve ◽  
Metal Arc Welding ◽  
Measured Resistance ◽  
X Ray Computed ◽  
Set Up ◽  
Tearing Resistance

Abstract This study evaluates the influence of volumetric discontinuities on the SENT tearing resistance curve as measured using DCPD and UC techniques. In order to do that, a series of SENT tests was carried out on specimens containing small drilled holes in different locations to simulate the presence of volumetric weld flaws. In addition, porous welds were produced by robotic Gas Metal Arc Welding (GMAW). Welding parameters were fine-tuned in order to obtain specimens with different porosity levels. Afterward, the pores were characterized by means of X-ray Computed Tomography (CT) scans and their position, shape and location were determined. SENT tests were performed in a servo-hydraulic machine using a double clip gauge set up to measure crack opening and DCPD and UC for crack sizing. The results indicated that volumetric discontinuities can influence the accuracy of crack measurement techniques in particular, and the measured resistance curve as a whole.

scholarly journals Effect Range of the Material Constraint in Different Strength Mismatched Laboratory Specimens

2020 ◽  
Vol 10 (7) ◽  
pp. 2434 ◽  
Author(s):  
Yue Dai ◽  
Jie Yang ◽  
Haofeng Chen
Keyword(s):  
Crack Propagation ◽  
Fracture Resistance ◽  
Compact Tension ◽  
Propagation Path ◽  
Resistance Curve ◽  
Single Edge ◽  
Integrity Assessment ◽  
Scientific Support ◽  
Resistance Curves ◽  
Initial Cracks

Different strength mismatched laboratory specimens that contain the compact tension (CT), single edge-notched tensile (SENT), and central-cracked tension (CCT) specimens with various specimen geometries, loading configurations, and initial cracks were selected to investigate the effect range of the material constraint systematically. The results showed that the effect range of material constraint exists in all the strength mismatched specimens and structures. The numerical value of the effect range is influenced by the geometry constraint. The high geometry constraint reduces the effect range of material constraint. When a material is located outside the effect range of material constraint, the fracture resistance curves and crack propagation paths of the specimens and structures are no longer influenced by the mechanical properties of the material. In addition, an interaction exists between the geometry constraint and material constraint. The high geometry constraint strengthens the effect of material constraint, whereas the fracture resistance curve and crack propagation path are insensitive to the material constraint under the low geometry constraint. The results in this study may provide scientific support for the structure integrity assessment and the design of strength mismatched structures.

Study on tearing tests and the determination of fracture toughness of PVC-coated fabric

2021 ◽  
pp. 152808372199394
Author(s):  
Han Bao ◽  
Minger Wu ◽  
Xubo Zhang
Keyword(s):  
Fracture Toughness ◽  
Failure Modes ◽  
Membrane Surface ◽  
Finite Size ◽  
Theoretical Method ◽  
Test Methods ◽  
Gauge Length ◽  
Test Method ◽  
Single Edge ◽  
Tearing Resistance

In this study, detailed uniaxial in-plane tearing tests including uniaxial central, single-edge notched, and trapezoidal tearing tests of a type of polyvinylchloride (PVC)-coated polyester fiber fabric were conducted. Two types of tearing failure modes, brutal and progressive, were examined. In addition to differences in the descending sections of the stress–displacement curves and the membrane surface morphology near the crack, it was found that the uniaxial central tearing test could be replaced by the corresponding single-edge notched tearing test to minimize the usage of test materials. The configuration of the single-edge notched specimen, including the gauge length and width, was investigated to determine the conditions under which the tearing resistance of the practically nearly infinite membrane surface can be studied with finite-size specimens. To obtain the fracture toughness GIC, which characterizes the ability of materials to prevent crack growth, a theoretical method and two test methods were introduced. After comparing the methods, the test method based on the area of the parallelogram obtained from the zigzag wave in the descending section of the load–displacement curves was proved to be superior. The value of GIC obtained with this simple test method was relatively stable, and it could be used to evaluate the tearing resistance and calculate the tearing strength of the coated fabrics.

Fracture Control — Offshore Pipelines: Experimental Studies on the Effect of Crack Depth and Asymmetric Geometries on the Ductile Tearing Resistance

2005 ◽  
Author(s):  
Ba˚rd Nyhus ◽  
Erling O̸stby ◽  
Hans Olav Knagenhjelm ◽  
Scott Black ◽  
Per Arne Ro̸stadsand
Keyword(s):  
Fracture Toughness ◽  
Crack Depth ◽  
Experimental Studies ◽  
Single Edge ◽  
Offshore Pipelines ◽  
Ductile Tearing ◽  
Single Edge Notch ◽  
Edge Notch ◽  
Fracture Control ◽  
Tearing Resistance

Engineering critical assessment of offshore pipelines is usually very conservative if standardized single edge notch bend (SENB) specimens are used for the fracture mechanics testing. It is commonly accepted that the fracture toughness is dependent on the geometry constraint at the crack tip. The standardized SENB specimens have a high geometry constraint, and give lower bound fracture toughness for all geometries. For circumferential flaws in pipes the single edge notch tension (SENT) specimens is taken more into use, to establish more correct fracture toughness for the pipe in question. In this paper the effect of crack depth, misalignment and different wall thicknesses in SENT specimens have been studied. In addition the effect of crack depth and internal pressure in pipes have been studied with FE simulations.

Estimation of the Fracture Resistance Curve for Gas Pipelines Using the Single Edge Notched Tension (SENT) Specimen

2019 ◽  
Vol 7 (1) ◽  
pp. 15-23
Author(s):  
Ik-Joong Kim ◽  
Young-Pyo Kim ◽  
Chul-Man Kim ◽  
Youn-Young Jang ◽  
Nam-Su Huh ◽  
...  
Keyword(s):  
Fracture Resistance ◽  
Resistance Curve ◽  
Gas Pipelines ◽  
Single Edge

Low-Constraint Toughness Testing: Results of a Round Robin on a Draft SE(T) Test Procedure

2013 ◽  
Author(s):  
William R. Tyson ◽  
James A. Gianetto
Keyword(s):  
Test Procedure ◽  
Round Robin ◽  
Resistance Curve ◽  
Single Specimen ◽  
Single Edge ◽  
Number Of Factors ◽  
The World ◽  
Toughness Testing ◽  
Low Constraint ◽  
Pipe Geometry

Assessment of the effect of girth weld flaws on pipeline integrity requires knowledge of a number of factors: pipe geometry, applied loads, flaw size, and pipe mechanical properties. Of the latter, strength and toughness are the primary factors. Toughness has conventionally been measured using specimens tested in bending to maximize constraint. While this gives a conservative estimate of toughness, it would be better to use a test that would reveal the toughness in constraint conditions typical of girth weld flaws: namely, relatively shallow flaws loaded in tension. Consequently, there is a trend to evaluate toughness using pre-cracked single-edge-cracked tension (i.e. SE(T)) specimens, and one procedure has already been standardized. However, this procedure requires the use of multiple specimens to generate a resistance curve. With the objective of devising a more economical test, a single-specimen procedure has been developed at CANMET. The viability of this procedure has been assessed by means of a round robin involving test and research laboratories from around the world. In this presentation, the results of the round robin will be presented and discussed.

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