WO2014062467A9 - A method of locating and sizing fatigue cracks - Google Patents
A method of locating and sizing fatigue cracks Download PDFInfo
- Publication number
- WO2014062467A9 WO2014062467A9 PCT/US2013/064245 US2013064245W WO2014062467A9 WO 2014062467 A9 WO2014062467 A9 WO 2014062467A9 US 2013064245 W US2013064245 W US 2013064245W WO 2014062467 A9 WO2014062467 A9 WO 2014062467A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- crack
- sensors
- tofd
- pas
- wall thickness
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
- G01N29/0654—Imaging
- G01N29/069—Defect imaging, localisation and sizing using, e.g. time of flight diffraction [TOFD], synthetic aperture focusing technique [SAFT], Amplituden-Laufzeit-Ortskurven [ALOK] technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/22—Details, e.g. general constructional or apparatus details
- G01N29/26—Arrangements for orientation or scanning by relative movement of the head and the sensor
- G01N29/262—Arrangements for orientation or scanning by relative movement of the head and the sensor by electronic orientation or focusing, e.g. with phased arrays
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/025—Change of phase or condition
- G01N2291/0258—Structural degradation, e.g. fatigue of composites, ageing of oils
Definitions
- the invention relates to a method for detecting and determining the size of fatigue cracks in steel components.
- the invention is useful for inspecting welds and base metal for fatigue cracks.
- a conventional method to inspect steel components for cracks using Phased Array Sectorial (PAS) and Time-of-Flight Diffraction (TOFD), is to collect data in the area of interest with a scanner where the PAS and TOFD sensors have been installed. Once the inspection is completed, the signals obtained from the PAS and TOFD sensors are
- FIG. 1 shows a diagram indicating the crack ends signals for a crack connected to the surface of the material as shown by PAS and TOFD.
- Figure 1 shows a PAS diagram of the inspection setup and a typical signal obtained.
- the setup shows the PAS sensor 101 positioned on the scan surface 102 of a test block 104.
- the ultrasonic beam 105 interacts with the crack 106.
- the crack tip 107 and the corner trap 109 generate the crack tip signal 108 and the corner trap signal 110 which identify the presence of the crack.
- FIG. 2 shows a TOFD diagram of the inspection setup and the signal obtained.
- the setup shows the TOFD emitter sensor 201 and the receiving sensor 202 which are positioned on the scan surface 203 of a test block 204.
- the ultrasonic beam 205 inside the test block 204 generates two main beam components known as the lateral wave 206 and the back wall echo 207.
- the ultrasonic beam 205 interacts with the crack 208 generating the crack signal 209 in the TOFD image. Also, in the TOFD image, one can observe the lateral wave 206 and the back wall echo 207.
- the invention provides a method of detecting and determining the size of fatigue cracks in steel components comprising: analyzing the component using a Time of Flight Diffraction (TOFD) ultrasonic technique to locate the crack tip; analyzing the component using a Phased Array Sectorial (PAS) ultrasonic technique to locate the crack corner trap; and calculating the distance between the crack tip and the crack corner trap to determine the height of the crack.
- TOFD Time of Flight Diffraction
- PAS Phased Array Sectorial
- Figure 1 depicts a diagram of the PAS setup and a typical signal obtained.
- Figure 2 depicts a diagram of the TOFD setup and a typical signal obtained.
- Figure 3 depicts the breaking of the lateral wave by an open crack such as an environmental crack.
- Figure 4 depicts the continuity of the lateral wave through a tight fatigue crack.
- Figure 5 depicts the PAS reflected wave from the corner trap of the crack shown in
- Figure 6 depicts an embodiment of the TOFD setup using two pairs of sensors.
- the invention provides a new inspection methodology developed to detect and size fatigue cracks connected to the surface of steel components by interpreting the combined set of ultrasonic signals from ultrasonic techniques in a new way.
- the invention takes advantage of the complementary behaviour shown by the Phased Array Sectorial (PAS) technique and the Time-of-Flight Diffraction (TOFD) technique in the detection and sizing of fatigue cracks.
- PAS Phased Array Sectorial
- TOFD Time-of-Flight Diffraction
- the lateral wave 301 is prevented from reaching the receiving sensor 304, indicating the presence of a defect connected with the scansurface 306, possibly a crack.
- the lateral wave 401 still reaches the receiving sensor 404 through the crack 403.
- Tight fatigue cracks reflect waves at the crack corner traps. These reflected waves provide a more reliable evidence of the presence of a crack than the search for the absence of transmitted signals.
- Figure 5 shows the PAS reflected wave from the corner trap 501 of the crack shown in Figure 4. The tightness of the crack 403 did not prevent the ultrasonic signal from being reflected at the corner trap position 501, indicating that there is a defect at the component scan surface 502, possibly a crack, producing the reflection.
- Fatigue cracks can generate multiple diffracted signals from the crack faces in addition to the diffracted signal from the crack tip.
- the crack tip diffracted signal 402 is shown accompanied by other diffracted signals 406 coming from the faces of the crack.
- the multiplicity of diffracted signals can obscure the selection of the correct tip diffraction signal. It is necessary to identify the real crack tip signal.
- the diffracted signals from a fatigue crack can be weak and therefore their amplitude can fall below the detection threshold for PAS.
- Figure 5 shows the PAS signal of the same crack detected by TOFD in Figure 4. Where TOFD could detect the crack tip diffracted signal, PAS could not.
- the inspection methodology for detecting and sizing fatigue cracks that are connected to the surface of a component comprises the following steps.
- the component is analyzed using the PAS technique and the TOFD technique.
- the resulting signals from the PAS technique are used to detect a corner trap.
- the lateral wave and back wall echo signals from the TOFD technique are ignored for the purpose of detecting a corner trap. If the PAS technique does not detect a corner trap then there is no crack connected to the surface of the component.
- the signals from the TOFD technique are used to detect a crack tip.
- the diffracted signal from the PAS technique is ignored for the purpose of detecting the crack tip.
- the TOFD technique gives multiple diffracted signals, and in these cases the correct tip diffraction signal can be determined according to the following rules.
- the tip diffraction signal 402 will be given by the diffracted signal farthest from the lateral wave 401 or closest to the back wall echo 405.
- the tip diffraction signal will be given by the diffracted signal closest to the lateral wave or farthest from the back wall echo 405.
- lateral wave removal software may be used to remove the lateral wave and detect a possible diffracted signal embedded in the lateral wave.
- the methodology is applied to detect and size fatigue cracks in a component having a wall thickness between about 0.75 inches (1.91 cm) and 1.25 inches (3.18 cm).
- the preferred setup to detect and size fatigue cracks in such a component will be described here and is illustrated in Figure 1.
- the PAS technique comprises using a linear sensor with 16 or more elements.
- the preferred frequency is 10 MHz and the sensor size is 0.9 inch (2.29 cm) by 0.6 inch (1.52 cm).
- the scan direction is from the opposite surface 103 to the scan surface 102, and the scan is performed with the first reflection from the opposite surface 103.
- the inspection is preferably performed from each side of the weld.
- the TOFD technique comprises using two pairs of sensors, with each pair working in an emitter-receiver configuration.
- the first pair 601 uses an ultrasonic frequency of 20 MHz and a focusing depth of 1/4 of the wall thickness.
- the second pair 602 uses an ultrasonic frequency of 10 MHz and a focusing depth of 3/4 of the wall thickness. All of the sensors have a diameter of 1/4 inch (0.64 cm).
- the PAS technique is used to detect crack corner traps at the scan surface and at the opposite surface.
- the first TOFD sensor pair 601 as shown in Figure 6, is used to detect crack tips located within the 40% of the wall thickness 605 nearest to the scan surface 603 regardless of whether the crack is connected to the scan surface 603 or the opposite surface 604. This region of the wall thickness is indicated as 606.
- the second TOFD sensor pair 602 is used to detect crack tips located within the 60% of the wall thickness 605 farthest from the scan surface regardless of whether the crack is connected to the scan surface 603 or the opposite surface 604. This region of wall thickness is indicated as 607.
- Figure 6 also shows the area covered by each pair of transducers. The figure shows cracks initiated at the scan surface and the opposite surface. The procedure used to find the corner traps and crack tips is as described above.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Acoustics & Sound (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13846392.2A EP2906906A1 (en) | 2012-10-15 | 2013-10-10 | A method of locating and sizing fatigue cracks |
AU2013331676A AU2013331676A1 (en) | 2012-10-15 | 2013-10-10 | A method of locating and sizing fatigue cracks |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201261713686P | 2012-10-15 | 2012-10-15 | |
US61/713,686 | 2012-10-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2014062467A1 WO2014062467A1 (en) | 2014-04-24 |
WO2014062467A9 true WO2014062467A9 (en) | 2014-11-06 |
Family
ID=50488655
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2013/064245 WO2014062467A1 (en) | 2012-10-15 | 2013-10-10 | A method of locating and sizing fatigue cracks |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2906906A1 (en) |
AU (1) | AU2013331676A1 (en) |
WO (1) | WO2014062467A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016155403A1 (en) * | 2015-04-02 | 2016-10-06 | 深圳市神视检验有限公司 | Ultrasonic detection and locating method and device based on tofd and phased array |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US9037419B2 (en) | 2011-05-10 | 2015-05-19 | Edison Welding Institute, Inc. | Portable matrix phased array spot weld inspection system |
WO2012154954A2 (en) | 2011-05-10 | 2012-11-15 | Edison Welding Institute, Inc. | Three-dimensional matrix phased array spot weld inspection system |
CN104439747B (en) * | 2014-11-13 | 2016-08-17 | 国家电网公司 | A kind of method detecting identification P92 steel weld metal microcrack |
JP6415345B2 (en) * | 2015-02-09 | 2018-10-31 | 三菱電機株式会社 | Ultrasonic diagnostic equipment |
CN104850683B (en) * | 2015-04-20 | 2018-05-15 | 重庆大学 | The method that material crack tip stress fields coefficient is calculated based on weak form quadrature member method |
CN104914161A (en) * | 2015-06-10 | 2015-09-16 | 西安金果能源动力设备检测有限公司 | Method for detecting inner wall cracks of tube seat hole of header adapter tube based on phased array technology |
CN105021708B (en) * | 2015-08-12 | 2018-02-16 | 武汉中科创新技术股份有限公司 | The visualization ultrasonic wave TOFD weld inspection systems that can be singly used |
JP2017075866A (en) * | 2015-10-15 | 2017-04-20 | 東京理学検査株式会社 | Measuring apparatus and measuring method |
CN105628791A (en) * | 2016-02-03 | 2016-06-01 | 安徽鸿路钢结构(集团)股份有限公司 | Welding detection method for tubular joints of steel pipe truss of K-type structure |
CN107576729B (en) * | 2017-09-15 | 2021-02-12 | 南京中车浦镇城轨车辆有限责任公司 | Ultrasonic phased array-based weld defect detection and rapid extraction system and method |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2840991B1 (en) * | 2002-06-17 | 2005-05-06 | Air Liquide | ULTRASONIC CONTROL METHOD FOR WELDED JOINTS |
CA2396117A1 (en) * | 2002-07-30 | 2004-01-30 | Michael Moles | Phased array ultrasonic ndt system for fastener inspections |
US20070000328A1 (en) * | 2005-01-06 | 2007-01-04 | Jonathan Buttram | Ultrasonic method for the accurate measurement of crack height in dissimilar metal welds using phased array |
EP2477042A1 (en) * | 2011-01-17 | 2012-07-18 | Université Montpellier 2 Sciences et Techniques | Method and device for measuring distance and orientation using a single electro-acoustic transducer |
-
2013
- 2013-10-10 EP EP13846392.2A patent/EP2906906A1/en not_active Withdrawn
- 2013-10-10 AU AU2013331676A patent/AU2013331676A1/en not_active Abandoned
- 2013-10-10 WO PCT/US2013/064245 patent/WO2014062467A1/en active Application Filing
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016155403A1 (en) * | 2015-04-02 | 2016-10-06 | 深圳市神视检验有限公司 | Ultrasonic detection and locating method and device based on tofd and phased array |
Also Published As
Publication number | Publication date |
---|---|
AU2013331676A1 (en) | 2015-04-02 |
EP2906906A1 (en) | 2015-08-19 |
WO2014062467A1 (en) | 2014-04-24 |
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