CN112362508B - Low-cycle strain fatigue control method for thin plate - Google Patents
Low-cycle strain fatigue control method for thin plate Download PDFInfo
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- CN112362508B CN112362508B CN202011061654.7A CN202011061654A CN112362508B CN 112362508 B CN112362508 B CN 112362508B CN 202011061654 A CN202011061654 A CN 202011061654A CN 112362508 B CN112362508 B CN 112362508B
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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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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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
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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
- G01N3/02—Details
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0005—Repeated or cyclic
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- G—PHYSICS
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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
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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
- G01N2203/02—Details not specific for a particular testing method
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- G01N2203/0274—Tubular or ring-shaped specimens
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0298—Manufacturing or preparing specimens
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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
- G01N2203/04—Chucks, fixtures, jaws, holders or anvils
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Abstract
The invention provides a method for controlling low-cycle strain fatigue of a thin plate, which comprises the steps of rolling a thin plate sample into a tube shape and welding a joint; carrying out a quasi-static tensile test on the sample to obtain basic mechanical parameters of the material; placing the prefabricated sample in a fatigue testing machine for locking, closing two ends of the prefabricated sample, wherein a reserved hole is reserved at one end, and flowing media is introduced into the inner cavity of the prefabricated sample through the reserved hole; clamping the extensometer to an intermediate section of the pre-fabricated sample; and setting a sample fatigue parameter according to the obtained material basic mechanical parameter, and performing strain fatigue test. The method for controlling the low-cycle strain fatigue of the thin plate can effectively solve the problem of compression instability of the thin plate in the low-cycle strain fatigue test of the thin plate, and the extensometer is easy to place and has good stability in the test process; and the buckling restrained device is not used, friction is not generated between the surface of the sample and the buckling restrained device in the test process, and the influence of the friction on the surface of the sample on the fatigue test precision is eliminated.
Description
Technical Field
The invention belongs to the technical field of sheet fatigue testing, and particularly relates to a sheet low-cycle strain fatigue control method.
Background
The fatigue endurance design of the automobile body is more and more concerned about the strain fatigue performance of the thin plate, however, buckling instability of the thin plate sample can occur in the compression process; aiming at a strain fatigue test of a sample with the thickness of less than 2.5mm in national standard GB/T26077-2010 axial strain control method for metal material fatigue test, an anti-buckling device is needed in the test control process; the geometry of the buckling restrained device needs to be matched with the sample, the buckling restrained device and the sample can cause the increase of the force value due to friction, and the increase of the force value caused by the friction force cannot exceed 2% of the test force at any stage of the test, so that precautions are needed to reduce the friction, generally, the friction is reduced by smearing the lubricating material between the sample and the buckling restrained device, but the holding force of the buckling restrained device is difficult to control. In addition, after the buckling preventing device is clamped, the extensometer can only be clamped on the narrow surface of the thin edge of the sample to measure the strain, the extensometer is not easy to place, and two identical extensometers are usually required to be respectively placed on the two thin edges of the sample to measure the strain, and the average value of the strain is taken as a control parameter of an experiment.
Disclosure of Invention
In view of the above, the invention aims to provide a method for controlling low-cycle strain fatigue of a thin plate, which aims to solve the problems of buckling instability of the thin plate, influence of friction between a sample and an buckling-restrained clamp on fatigue test precision, difficulty in placing an extensometer and poor stability in an experimental process in the compression process of a strain fatigue test in the prior art.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
a method for controlling low-cycle strain fatigue of a thin plate comprises the following steps:
(1) Rolling the sheet sample into a tube shape, and welding the joint;
(2) Carrying out quasi-static tensile test on the rolled tubular prefabricated sample to obtain material basic mechanical parameters;
(3) Placing the prefabricated sample in a fatigue testing machine for locking, closing two ends of the prefabricated sample, wherein a reserved hole is reserved at one end, and flowing media is introduced into the inner cavity of the prefabricated sample through the reserved hole;
(4) Clamping the extensometer to an intermediate section of the pre-fabricated sample;
(5) And setting a sample fatigue parameter according to the obtained material basic mechanical parameter, and performing strain fatigue test.
Further, the welding adopts a laser welding process.
Further, after the welding is completed, when the performance of the weld zone is lower than that of the base material, the non-weld zone needs to be thinned.
Judging the weld performance by interrupting the cracking starting position in the quasi-static stretching process to occur in the weld zone or the non-weld zone, and if the cracking starting position does not occur in the weld zone, indicating that the weld performance is superior to that of the parent metal, and thinning the non-weld zone is not required.
Further, the material base mechanical parameters include material yield strength, tensile strength and elastic modulus.
Further, the flowing medium is water.
Further, the pressure of the flowing medium is 0.01-10 Mpa.
The invention also provides an auxiliary tool for the thin plate low-cycle strain fatigue control method, which comprises an upper A clamping block, an upper B clamping block, a lower A clamping block, a lower B clamping block, an upper sealing head and a lower sealing head; the symmetrical surfaces of the upper A clamping block and the upper B clamping block are respectively provided with semicircular through grooves which are symmetrically arranged, and the upper A clamping block and the upper B clamping block can clamp one end of a tubular sample; semi-circular through grooves which are symmetrically arranged are also formed in the symmetrical surfaces of the lower A clamping block and the lower B clamping block, and the lower A clamping block and the lower B clamping block can clamp the other end of the tubular sample; the upper seal head or the lower seal head is provided with a preformed hole, and the upper seal head and the lower seal head can be used for plugging two ends of a tubular sample.
The upper A clamping block and the upper B clamping block are clamped at one end of the tubular sample, the lower A clamping block and the lower B clamping block can clamp the other end of the tubular sample, namely, two ends of the sample are respectively inserted into symmetrical semicircular through grooves at the upper end and the lower end, the upper A clamping block and the upper B clamping block are respectively inserted into symmetrical semicircular through grooves at the lower end, and the outer sides of the lower A clamping block and the lower B clamping block can be directly locked by a clamp of the fatigue testing machine, so that the sample is fixed; the upper end enclosure and the lower end enclosure are used for blocking two ends of the tubular sample, and as the upper end enclosure or the lower end enclosure is provided with the reserved holes, a flowing medium with a certain pressure can be introduced into the inner cavity of the tubular sample through the reserved holes so as to provide stability of the sample when the sample is stressed in the experimental process.
Compared with the prior art, the thin plate low-cycle strain fatigue control method has the following advantages:
(1) According to the method for controlling the low-cycle strain fatigue of the thin plate, the thin plate is coiled and welded into the tube, the flowing medium with certain pressure is introduced into the tubular sample, so that the sample is more stable in the experimental process, the problem of buckling instability of the thin plate in the compression process of the strain fatigue test is solved, the experimental operation is simple, the test result is accurate, and the experimental result is helpful for guiding the design and evaluation of the service performance of the vehicle body;
(2) Compared with the existing extensometer which can only be used for measuring the strain on the narrow surface of the thin edge of the sample, the low-cycle strain fatigue control method for the thin plate is easier to place and has good stability in the test process;
(3) According to the method for controlling the low-cycle strain fatigue of the thin plate, the buckling-restrained device is not used, friction is not generated between the surface of the sample and the buckling-restrained device in the test process, and the influence of the friction on the surface of the sample on the fatigue test precision is eliminated.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of the installation of a low-cycle strain fatigue test for a thin plate according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a tubular sample according to an embodiment of the present invention.
Reference numerals illustrate:
1-a tubular specimen; 2-an upper sealing head; 3-a lower end socket; 4-upper A clamp blocks; 5-upper B clamp blocks; 6-lower A clamp blocks; 7-lower B clamp blocks; 8-preformed holes; 9-extensometer.
Detailed Description
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
Taking a certain automobile steel low cycle fatigue test as an example, the aim is to obtain the low cycle fatigue performance of a sheet with no influence on the weld zone performance. The specific implementation method is as follows:
(1) The hot formed steel with the plate thickness of 1.5mm is rolled into a tube shape under the condition of supplying goods, and laser welding is carried out to form a tube-shaped sample 1 with the inner diameter of 20mm and the length of 100mm, as shown in figure 2;
(2) The steel plate needs to be pretreated before the experiment: placing a ceramic support rod in the tubular sample 1, heating in a heating furnace to austenitize, transferring the heated sample into a water tank to quench, and taking out the ceramic support rod to obtain the hot forming steel in a service state;
(3) Carrying out a static stretching experiment on the tubular sample 1 in a service state, wherein the breaking start position in the static stretching process does not occur at the welding seam position, the welding seam performance is excellent, and the material sample does not need further thinning processing; obtaining basic mechanical parameters of the material through a quasi-static tensile test;
(4) Transferring the tubular sample 1 into a fatigue testing machine; respectively inserting an upper seal head 2 and a lower seal head 3 at two ends of a tubular sample 1; coating an upper A clamping block 4 and an upper B clamping block 5 on one end of a tubular sample 1, coating a lower A clamping block 6 and a lower B clamping block 7 on the other end of the tubular sample 1, and clamping and locking the upper A clamping block 4, the upper B clamping block 5, the lower A clamping block 6 and the lower B clamping block 7 by a hydraulic flat pushing clamp of a fatigue testing machine so as to fix the tubular sample 1, wherein the figure 1 is shown;
(5) Clamping the extensometer 9 to the intermediate section of the prefabricated tubular specimen 1; introducing 5Mpa of water into the tubular sample 1 through the preformed hole 8 on the upper seal head 2;
(6) Setting strain fatigue control parameters according to the obtained material basic mechanical parameters and performing related fatigue tests; the specific test parameters and results are shown in Table 1.
TABLE 1 Low cycle fatigue test data for 1500MPa grade thermoformed Steel (1.5 mm) sheet
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (5)
1. A method for controlling low-cycle strain fatigue of a thin plate is characterized by comprising the following steps of: the method comprises the following steps:
(1) Rolling the sheet sample into a tube shape, and welding the joint;
(2) Carrying out quasi-static tensile test on the rolled tubular prefabricated sample to obtain material basic mechanical parameters;
(3) Placing the prefabricated sample in a fatigue testing machine for locking, closing two ends of the prefabricated sample, reserving a reserved hole on one end, introducing a flowing medium into an inner cavity of the prefabricated sample through the reserved hole, wherein the introduced flowing medium is water, and the pressure of the introduced flowing medium is 0.01-10 Mpa;
(4) Clamping the extensometer to an intermediate section of the pre-fabricated sample;
(5) And setting a sample fatigue parameter according to the obtained material basic mechanical parameter, and performing strain fatigue test.
2. The method for controlling low-cycle strain fatigue of a thin plate according to claim 1, wherein: the welding adopts a laser welding process.
3. The method for controlling low-cycle strain fatigue of a thin plate according to claim 1, wherein: after the welding is finished, when the performance of the welding area is lower than that of the base material, the non-welding area needs to be thinned.
4. The method for controlling low-cycle strain fatigue of a thin plate according to claim 1, wherein: the material basic mechanical parameters comprise material yield strength, tensile strength and elastic modulus.
5. An auxiliary tool for the sheet low-cycle strain fatigue control method according to claim 1, wherein: the device comprises an upper A clamping block, an upper B clamping block, a lower A clamping block, a lower B clamping block, an upper sealing head and a lower sealing head; the symmetrical surfaces of the upper A clamping block and the upper B clamping block are respectively provided with semicircular through grooves which are symmetrically arranged, and the upper A clamping block and the upper B clamping block can clamp one end of a tubular sample; semi-circular through grooves which are symmetrically arranged are also formed in the symmetrical surfaces of the lower A clamping block and the lower B clamping block, and the lower A clamping block and the lower B clamping block can clamp the other end of the tubular sample; the upper seal head or the lower seal head is provided with a preformed hole, and the upper seal head and the lower seal head can be used for plugging two ends of a tubular sample.
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| CN202011061654.7A CN112362508B (en) | 2020-09-30 | 2020-09-30 | Low-cycle strain fatigue control method for thin plate |
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| CN113654928A (en) * | 2021-08-31 | 2021-11-16 | 无锡百年通工业输送有限公司 | Method for detecting dynamic flex fatigue performance of tubular conveyer belt |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS63100349A (en) * | 1986-10-16 | 1988-05-02 | Fuji Electric Co Ltd | Testing method for low-cycle tensile and compressive fatigue of thin plate |
| JPH0670604B2 (en) * | 1990-03-16 | 1994-09-07 | 真 菊川 | Method and apparatus for fracture mechanical fatigue testing of brittle materials |
| FR2671181B1 (en) * | 1990-12-31 | 1993-04-23 | Gaz De France | GENERALIZED HIGH-TEMPERATURE CORROSION TEST INSTALLATION. |
| US20040184871A1 (en) * | 2003-03-21 | 2004-09-23 | Hans-Bernd Luft | Composite low cycle fatigue coiled tubing connector |
| CN201382883Y (en) * | 2009-01-14 | 2010-01-13 | 北京航空航天大学 | Turbine disk/blade joggle joint high-temperature composite fatigue loading device |
| CN102353586A (en) * | 2011-06-22 | 2012-02-15 | 长安大学 | Steel strand strain measuring device |
| CN102735557B (en) * | 2012-05-22 | 2015-03-25 | 奇瑞汽车股份有限公司 | Fatigue test device for vehicle body thin plate, and test method thereof |
| CN107436263B (en) * | 2017-08-18 | 2023-07-21 | 中机生产力促进中心有限公司 | Spring steel wire torsion fatigue test method and device thereof |
| CN107727505A (en) * | 2017-09-15 | 2018-02-23 | 武汉钢铁有限公司 | A kind of plane strain extension (PSE) method |
| CN109490109B (en) * | 2018-02-06 | 2021-07-23 | 中国科学院金属研究所 | High-temperature and high-pressure water corrosion fatigue test device for tubular sample |
| CN108693055B (en) * | 2018-06-19 | 2020-10-23 | 西南交通大学 | Method for acquiring material fatigue performance of thin sheet sample |
| CN109883826B (en) * | 2019-02-14 | 2020-09-04 | 上海交通大学 | Method for testing low-cycle fatigue performance of non-uniform structure thick plate welding joint |
| CN110631933B (en) * | 2019-09-20 | 2020-11-20 | 北京航空航天大学 | High-temperature large-load test fixture and test method for turbine blade joggle joint structure |
| CN111006881A (en) * | 2019-12-28 | 2020-04-14 | 中汽研汽车检验中心（天津）有限公司 | Novel pedal fatigue endurance test device |
| CN211553562U (en) * | 2019-12-30 | 2020-09-22 | 上海航空材料结构检测股份有限公司 | Sheet metal draws and presses low cycle fatigue buckling restrained device |
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