CN113075064A - Full-size fatigue test method for tension tendon welded joint of tension leg platform - Google Patents
Full-size fatigue test method for tension tendon welded joint of tension leg platform Download PDFInfo
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- CN113075064A CN113075064A CN202110164542.2A CN202110164542A CN113075064A CN 113075064 A CN113075064 A CN 113075064A CN 202110164542 A CN202110164542 A CN 202110164542A CN 113075064 A CN113075064 A CN 113075064A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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Abstract
The invention discloses a full-scale fatigue test method for a tension leg platform tension tendon welded joint, which is used for carrying out a full-scale fatigue test on a tension leg tendon circumferential weld for the first time, and can evaluate the stability and reliability of the fatigue performance of a welded joint in a welding process through the full-scale fatigue test method so as to verify whether the fatigue performance of the welded joint in the welding process can meet the requirements of corresponding standard specifications; compared with the common small-size fatigue test method for taking a plurality of samples with specified sizes in the circumferential direction of the circular seam according to the standard requirements and carrying out fatigue test on each sample to evaluate the fatigue performance of the welding seam in the prior art, the full-size fatigue test method disclosed by the invention can overcome the size effect of a reduced-scale fatigue test, investigate the influence of welding residual stress on the fatigue performance of the welding seam, more accurately research the fatigue performance of the circular seam of the tendon under tension, more truly simulate the actual working condition on the spot and provide a good reference for engineering practice.
Description
Technical Field
The invention relates to the technical field of welding, in particular to a full-size fatigue test method for a tension tendon welding joint of a tension leg platform.
Background
A Tension Leg Platform (TLP), as a semi-compliant semi-rigid Platform, has been widely applied and developed in the field of deepwater offshore oil and gas development, and has become a main form of deepwater oil production Platform in the offshore industry. The tension Tendon (Tendon) is used for tensioning and fixing the tension leg platform on the pile foundation of the seabed, so that the motion of the platform under the action of environmental force is controlled within a specified range. The tension tendon bears the action of various loads in the service process, the outside is influenced by wind, waves, flow and the like, the inside is influenced by internal pressure and temperature, high-order modal vibration is generated due to the action, fatigue failure is generated, particularly wave load in environmental load, and long-acting alternating load is the main load influencing the fatigue performance of the tension leg.
The full-scale fatigue test is not taken as the relevant research of the testability test of the fatigue performance of the welding joint of the tension tendon at home. The full-scale fatigue test can comprehensively simulate the stress concentration, residual stress, welding defects and other influence factors on the fatigue performance of the welded joint, has no size effect, is superior to the small-scale fatigue test in the evaluation on the fatigue performance of the welded joint, and can more truly reflect the fatigue performance of the welded joint of the tension tendon, thereby evaluating the rationality and reliability of the welding process formulation to a certain extent and providing technical basis for engineering practice.
Disclosure of Invention
The invention aims to provide a full-scale fatigue test method for a tension tendon welding joint of a tension leg platform, which is used for evaluating the full-scale fatigue performance of the tension tendon welding joint of the tension leg platform so as to evaluate or prove the rationality and reliability of the developed tension tendon welding process.
In order to solve the technical problem, the invention provides a full-size fatigue test method for a tension tendon welded joint of a tension leg platform, which comprises the following steps of:
s1: preparing a sample;
s2: mounting the test sample on a testing machine;
s3: installing a detection instrument;
s4: fatigue test;
s5: and analyzing and checking the test result of the fatigue test.
In a further improvement, in step S1, the test specimen includes an intermediate connector and four tendon tube sections, wherein the tube sections are made of API 5L X70M PSL2, the intermediate connector is tubular and made of ASTM a707 gr.3w, the inner diameters of the tube sections and the intermediate connector are 914.4mm, and the wall thickness of the tube is 38.1 mm.
The improved structure of the test sample comprises a middle connector, pipe sections and a second connector, wherein the middle connector and the pipe sections are coaxially distributed, the four pipe sections are symmetrically arranged on two sides of the middle connector, the two pipe sections are connected through a first girth weld, the pipe sections are connected with the middle connector through a second girth weld, the total length of the test sample is 13.6 meters, the length of each pipe section is 3m, and the length of the middle connector is 1.6 m.
The further improvement lies in that the testing machine in step S2 is four-point bending fatigue testing machine, including the base, be provided with four on the base and be used for the centre gripping the anchor clamps of sample, wherein be located two at base both ends anchor clamps are the stiff end, are used for fixed centre gripping the sample, two in addition anchor clamps are for doing the end, are located two between the stiff end and with the base is articulated.
In a further improvement, the mounting of the test specimen in step S2 includes the following steps:
starting the testing machine after opening the control software of the testing machine, so that the testing machine is always in a controlled state; debugging the testing machine, and adjusting two ends of the testing machine to ensure that the testing space is matched with the length of the sample; and hoisting the sample to the position near the testing machine, centering the sample with the testing machine, and ensuring that the acting end and the fixed end of the testing machine are at the same height with the sample and are positioned at the acting end and the fixed end, and the clamp is tightly attached to the outer surface of the sample.
The further improvement lies in that the installation detection instrument in step S3 includes an installation strain test device, a displacement detection device and a pressure detection device, wherein the strain test device is a plurality of strain gauges, the strain gauges are attached to the first girth weld and the second girth weld, the displacement detection device is a displacement sensor, and is attached to the outer surface of the intermediate connector, and the pressure detection device is a pressure sensor, and is disposed in the pipe of the intermediate connector.
The further improvement is that the strain gage adopts a three-way strain gage arrangement.
A further improvement is that the strain gage is also disposed intermediate the outer surface of the intermediate connector.
The further improvement is that the fatigue test in the step S4 includes a four-point bending test and a tensile test, in the four-point bending test, the dynamic loading load of the four-point bending fatigue test is-2400 KN-1200 KN, the four-point bending fatigue test is performed 1200KN downwards and 2400KN upwards, a sine wave loading mode is adopted, and the loading frequency is 0.5 Hz.
In a further improvement, the fatigue test result analysis test in step S5 is as follows: after the test is finished, the test result is compared with the C1 curve corresponding to the DNVGL-RP-C203 marine structural steel fatigue design specification.
The invention has the technical effects that: the full-scale fatigue test method is used for carrying out a full-scale fatigue test on a tension tendon ring weld for the first time, and can be used for evaluating the stability and reliability of the fatigue performance of a welding head of a welding process so as to verify whether the fatigue performance of the welding head of the welding process can meet the requirements of corresponding standard specifications; compared with the common small-size fatigue test method for taking a plurality of samples with specified sizes in the circumferential direction of the circular seam according to the standard requirements and carrying out fatigue test on each sample to evaluate the fatigue performance of the welding seam in the prior art, the full-size fatigue test method disclosed by the invention can overcome the size effect of a reduced-scale fatigue test, investigate the influence of welding residual stress on the fatigue performance of the welding seam, more accurately research the fatigue performance of the circular seam of the tendon under tension, more truly simulate the actual working condition on the spot and provide a good reference for engineering practice.
Drawings
FIG. 1 is a flow chart of a full-scale fatigue test method for a tension tendon welded joint of a tension leg platform according to the present invention;
FIG. 2 is a schematic representation of a sample format of the present invention;
FIG. 3 is a schematic view of a test specimen of the present invention mounted on a testing machine;
FIG. 4 is a strain gage layout in one embodiment of the invention;
FIG. 5 is a graph of response strain peaks obtained in one embodiment of the present invention.
100-sample, 1-pipe section, 2-first girth weld, 3-strain gauge, 4-intermediate connector, 5-acting end, 6-second girth weld, 7-testing machine, 8-base, 9-clamp, 10-fixed end, 11-supporting structure and 12-protection pad.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
In one embodiment of the present invention, as shown in fig. 1, a method for full-scale fatigue testing of a tension leg platform tendon welded joint comprises the steps of:
the first step is as follows: preparing a sample;
fig. 2 is a schematic representation of a sample form of the present invention, and as shown in fig. 2, a sample 100 comprises an intermediate connector 4 and four tendon tube sections 1, wherein the tube sections 1 are made of API 5L X70M PSL2, the intermediate connector 4 is tubular and made of ASTM a707 gr.3w, the inner diameter of the tube sections 1 and the intermediate connector 4 is 914.4mm, and the wall thickness of the tube is 38.1 mm.
The middle connector 4 and the pipe sections 1 are coaxially distributed, four pipe sections 1 are symmetrically arranged on two sides of the middle connector 4, the two pipe sections 1 are connected through a first girth weld 2, the pipe sections 1 and the middle connector 4 are connected through a second girth weld 6, the total length of the test sample 100 is 13.6 meters, the length of each pipe section 1 is 3m, the length of the middle connector 4 is 1.6m, it should be understood that the test sample 100 in the embodiment is designed according to the connection relation and the size proportion of the pipe sections 1 and the middle connector 4 in the actual tension leg tension tendon, and only schematic illustration is provided in fig. 2.
The second step is that: mounting the test sample on a testing machine;
fig. 3 is a schematic diagram of the test sample of the present invention mounted on a testing machine, and as shown in fig. 3, the testing machine 7 is a four-point bending fatigue testing machine, and includes a base 8, four clamps 9 for clamping the test sample are arranged on the base 8, wherein two clamps 9 located at two ends of the base 8 are fixed ends 10 for fixedly clamping the test sample 100, and the other two clamps 9 are movable ends 5 located between the two fixed ends 10 and hinged to the base 8.
The installation of the test specimen comprises the following steps:
starting the testing machine 7 after the control software of the testing machine 7 is opened, so that the testing machine 7 is always in a controlled state; debugging the testing machine 7, and adjusting two fixed ends 10 of the testing machine 7 to ensure that the testing space is matched with the length of the sample 100; and hoisting the sample 100 to the position near the testing machine 7 and then centering the sample 100 with the testing machine 7, so as to ensure that the acting end 5 and the fixed end 10 of the testing machine 7 are at the same height with the sample 100, and the clamps 9 of the two acting ends 5 and the two fixed ends 10 are tightly attached to the outer surface of the sample 100.
Referring to fig. 3, the base 8 is placed on a plane, the clamp 9 is sleeved outside the sample 100 and is connected with the base 8 through the supporting structure 11, the supporting structure 11 is perpendicular to the base 8, the clamp 9 comprises two semi-arc-shaped clamping plates sleeved outside the sample 100, and the two semi-arc-shaped clamping plates clamp the sample 100 and are connected through bolts.
The support structure 11 can slide on the base 8 and is screwed to the base 8; the fixture 9 of the fixed end 10 is fixedly connected with the supporting structure 11, the fixture 9 of the actuating end 5 is hinged with the supporting structure 11, the sample 100 is parallel to the base 8 and is arranged on the fixtures 9 of the two fixed ends 10 in a supporting mode, the fixture 9 of the fixed end 10 is fixed with the sample 100 after centering, the fixture 9 of the actuating end 5 is adjusted in a fine mode, the fixture 9 is made to be tightly attached to the outer surface of the sample 100 without gaps, and then bolts are fastened.
After the sample 100 is installed, it is also necessary to check whether the sample 100 is installed in place: in this embodiment, in order to prevent the sample 100 and the jig 9 from loosening, a protective pad 12 is further provided between the sample 100 and the jig 9, and the protective pad 12 is made of rubber.
The third step: installing a detection instrument;
the installation detecting instrument comprises an installation strain testing device, a displacement detecting device and a pressure detecting device, wherein the strain testing device is a plurality of strain gauges 3, the strain gauges 3 are attached to the positions of a first girth welding line 2 and a second girth welding line 6, the displacement detecting device is a displacement sensor and is attached to the outer surface of an intermediate connector 4, and the pressure detecting device is a pressure sensor and is arranged in a pipe of the intermediate connector 4.
Further, the strain gauge 3 adopts a three-way strain gauge arrangement.
Fig. 4 is a diagram of a strain gauge arrangement in an embodiment of the present invention, and referring to fig. 4, a strain gauge 3 is further arranged in the middle of the outer surface of the intermediate connector 4.
The fourth step: fatigue test;
the four-point bending test method comprises a four-point bending test and a stretching test, wherein in the four-point bending test, the dynamic loading load of the four-point bending fatigue testing machine is-2400 KN-1200 KN, the four-point bending fatigue testing machine moves 1200KN downwards and 2400KN upwards, a sine wave loading mode is adopted, and the loading frequency is 0.5 Hz; after the four-point bending test is finished, carrying out an axial tension test on the sample, loading by using displacement, and collecting applied load data, strain data, displacement data and sample internal pressure data which are obtained by measuring by using a strain testing device, a displacement detection device and a pressure detection device; when the internal pressure or load data of the sample suddenly drop or the test piece 100 is damaged, the test is finished, and various data obtained through measurement are counted and analyzed; the following table is a statistical table of the measured strain data in a preferred embodiment of the present invention, and the pasting scheme of the strain gauge is shown in fig. 3.
The fifth step: and analyzing and checking the test result of the fatigue test.
After the test is finished, the test result is compared with a C1 curve corresponding to DNVGL-RP-C203 marine structural steel fatigue design specification, and the test standard of the fatigue test result is that the fatigue performance of all welding joints is superior to the requirement of a C1 curve corresponding to the DNVGL-RP-C203 specification.
The specific detection method comprises the following steps: and collecting the peak-valley value of each strain test point, reading the strain peak-valley value, obtaining the strain amplitude and the equivalent strain value corresponding to each test point according to the mechanical principle and the fourth strength theory, and comparing the strain amplitude and the equivalent strain value with the result obtained by finite element analysis. The number of fatigue cycles was also recorded and compared to the fatigue performance in the DNV C203 specification. Referring to the above table, in one embodiment of the present invention, the maximum strain occurs at the position 1, i.e., the top of the sample, the equivalent strain is 734.9 μ ∈, the maximum strain amplitude 732.5 μ ∈ and the maximum stress amplitude is 157.5Mpa, fig. 5 is a response strain peak diagram obtained in one embodiment of the present invention, according to fig. 5, the response strain peak value obtained by finite element analysis is 761.4 μ ∈, the results are substantially consistent, and the test results and the finite element analysis results are mutually verified; the fatigue cycle times of the final test reach 105.5 ten thousand, and the sample is not damaged; in the embodiment, the welding fatigue performance of the sample 100 is better than that of the C1 curve value corresponding to the DNV C203 specification, and the reliability of the welding process of the sample 100 is verified.
The full-scale fatigue test method is used for carrying out a full-scale fatigue test on a tension tendon ring weld for the first time, and can be used for evaluating the stability and reliability of the fatigue performance of a welding head of a welding process so as to verify whether the fatigue performance of the welding head of the welding process can meet the requirements of corresponding standard specifications; compared with the common small-size fatigue test method for taking a plurality of samples with specified sizes in the circumferential direction of the circular seam according to the standard requirements and carrying out fatigue test on each sample to evaluate the fatigue performance of the welding seam in the prior art, the full-size fatigue test method disclosed by the invention can overcome the size effect of a reduced-scale fatigue test, investigate the influence of welding residual stress on the fatigue performance of the welding seam, more accurately research the fatigue performance of the circular seam of the tendon under tension, more truly simulate the actual working condition on the spot and provide a good reference for engineering practice.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (10)
1. A full-size fatigue test method for a tension tendon welded joint of a tension leg platform is characterized by comprising the following steps:
s1: preparing a sample;
s2: mounting the test sample on a testing machine;
s3: installing a detection instrument;
s4: fatigue test;
s5: and analyzing and checking the test result of the fatigue test.
2. A method of full-scale fatigue testing of a tension leg platform tendon weld joint as claimed in claim 1, wherein: in step S1, the test sample includes an intermediate connector and four tendon tube segments, wherein the tube segments are made of API 5L X70M PSL2, the intermediate connector is tubular and made of ASTM a707 gr.3w, the inner diameters of the tube segments and the intermediate connector are 914.4mm, and the thickness of the tube wall is 38.1 mm.
3. A method of full-scale fatigue testing of a tension leg platform tendon weld joint as claimed in claim 2, wherein: the middle connector and the pipe sections are coaxially distributed, four pipe sections are symmetrically arranged on two sides of the middle connector, the two pipe sections are connected through a first girth weld, the pipe sections are connected with the middle connector through a second girth weld, the total length of the test sample is 13.6 meters, the length of each pipe section is 3m, and the length of the middle connector is 1.6 m.
4. The method for testing the full-scale fatigue of the welded joint of the tension leg platform tension tendon as claimed in claim 1, wherein the testing machine in step S2 is a four-point bending fatigue testing machine, and comprises a base, four clamps for clamping the test sample are arranged on the base, two clamps at two ends of the base are fixed ends for fixedly clamping the test sample, and the other two clamps are movable ends and are located between the two fixed ends and hinged to the base.
5. A method for full-scale fatigue testing of a tension leg platform tendon welded joint as claimed in claim 4 wherein the installation of the coupon in step S2 includes the steps of:
starting the testing machine after opening the control software of the testing machine, so that the testing machine is always in a controlled state; debugging the testing machine, and adjusting two ends of the testing machine to ensure that the testing space is matched with the length of the sample; and hoisting the sample to the position near the testing machine, centering the sample with the testing machine, and ensuring that the acting end and the fixed end of the testing machine are at the same height with the sample and are positioned at the acting end and the fixed end, and the clamp is tightly attached to the outer surface of the sample.
6. A method of full-scale fatigue testing of a tension leg platform tendon weld joint as claimed in claim 3, wherein: the installation detection instrument in the step S3 comprises an installation strain test device, a displacement detection device and a pressure detection device, wherein the strain test device is a plurality of strain gauges, the strain gauges are attached to the first girth weld joint and the second girth weld joint, the displacement detection device is a displacement sensor and is attached to the outer surface of the middle connector, and the pressure detection device is a pressure sensor and is arranged in the pipe of the middle connector.
7. The full-scale fatigue testing method for a tension leg platform tendon weld joint as claimed in claim 6, wherein: the strain gauge is arranged in a three-dimensional strain pattern mode.
8. The full-scale fatigue testing method for a tension leg platform tendon weld joint as claimed in claim 6, wherein: the strain gauge is further arranged in the middle of the outer surface of the middle connector.
9. The method for testing the full-scale fatigue of a welded joint of a tension leg platform tendon as claimed in claim 1, wherein the fatigue tests in step S4 comprise a four-point bending test and a tensile test, wherein the four-point bending test comprises a dynamic loading of-2400 KN to 1200KN, a downward action of 1200KN, an upward action of 2400KN, a sine wave loading mode and a loading frequency of 0.5 Hz.
10. A method for full-scale fatigue testing of a tension leg platform tendon weld joint as claimed in claim 1, wherein the analytical testing of the fatigue testing results in step S5 is as follows: after the test is finished, the test result is compared with the C1 curve corresponding to the DNVGL-RP-C203 marine structural steel fatigue design specification.
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