CN-121994625-A - Fatigue testing machine and method for predicting high cycle fatigue life of metal material

CN121994625ACN 121994625 ACN121994625 ACN 121994625ACN-121994625-A

Abstract

The invention belongs to the technical field of test equipment, and particularly relates to a fatigue testing machine and a testing method for predicting the high cycle fatigue life of a metal material, wherein the fatigue testing machine comprises a high-temperature simulation assembly, the high-temperature simulation assembly comprises a high-temperature generator body and an adjustable framework I for installing the high-temperature generator body, and the two high-temperature generator bodies are assembled for heating the metal material; the coaxial calibration assembly comprises a calibration shell, an adjustable framework II, a screw column and a guide rod, wherein the adjustable framework II is used for assembling the calibration shell and the adjustable framework II for installing the calibration shell, one ends of the two calibration shells are respectively provided with an adjustable assembly measuring meter, the two measuring meters are distributed at two ends of a metal material and used for detecting coaxiality, and the torsion giving assembly is arranged on the surface of a bottom testing machine and matched with a clamp below to give torsion load to the metal material. The invention can solve the problems of data distortion, functional limitation and insufficient scene adaptation caused by coaxiality deviation.

Inventors

DONG ZHEN
SUN JU
ZHAO SHUANGSHUANG
GOU YANGYANG
JIN SHU
ZHANG HAN
Chai yang
WANG YUNXIAO
LIU SHUAI

Assignees

辽宁中科力勒检测技术服务有限公司

Dates

Publication Date: 20260508
Application Date: 20260408

Claims (10)

1. The utility model provides a metal material high cycle fatigue life predicts and uses fatigue testing machine, includes that experimental end machine (1) and electromagnetism high frequency take place organism (103), and the surface of experimental end machine (1) is provided with spiral shell tubular column (102), and experimental end machine (1) surface is provided with guide arm (105) that supplementary electromagnetism high frequency takes place organism (103) go up and down, electromagnetism high frequency takes place organism (103) lower surface is provided with counter weight platform (106), clamping assembly (6) are all through clamping assembly (107) centre gripping that set up to experimental end machine (1) surface and counter weight platform (106) lower surface, its characterized in that still includes: The high-temperature simulation assembly (3), the high-temperature simulation assembly (3) comprises a high-temperature generator body (307) and an adjustable framework I for installing the high-temperature generator body (307), wherein the adjustable framework I is assembled with a screw column (102) and a guide rod (105), and the two high-temperature generator bodies (307) are assembled for heating metal materials; The coaxial calibration assembly (4), the coaxial calibration assembly (4) comprises a calibration shell (411) and an adjustable framework II for installing the calibration shell (411), the adjustable framework II is assembled with a screw column (102) and a guide rod (105), one ends of the two calibration shells (411) are all adjustable to assemble measuring meters (415), and the two measuring meters (415) are distributed at two ends of a metal material and are used for detecting coaxiality; and a torsion imparting component (5), wherein the torsion imparting component (5) is arranged on the surface of the test bed (1) and is matched with a clamp (6) positioned below to impart torsion load to the metal material.
2. The fatigue testing machine for predicting the high cycle fatigue life of a metal material according to claim 1, wherein a ceramic liner (308) is embedded in the inner wall of the high temperature generator (307), and a heating element (309) is provided in the ceramic liner (308).
3. The fatigue testing machine for predicting the high cycle fatigue life of the metal material according to claim 1, wherein the second adjustable framework comprises a third ring frame (401) and a fourth ring frame (402), the third ring frame (401) and the fourth ring frame (402) on the same side are jointly assembled with a second track (403), the second track (403) on both sides are jointly assembled with a vertical sliding frame (404) in a damping sliding manner, the middle part of the vertical sliding frame (404) is fixedly assembled with a six-side vertical frame (405), and fork supports (408) for supporting corresponding clamping assemblies (107) are fixedly installed at the top end and the bottom end of the six-side vertical frame (405).
4. The fatigue testing machine for predicting the high cycle fatigue life of a metal material according to claim 3, wherein a ring support (406) is fixedly arranged in the middle of the inner side of the hexagonal stand (405), a ring rail (407) is integrally arranged at the inner edge of the ring support (406), a track car (409) is assembled on the surface of the ring rail (407) in a sliding manner, a vertical pipe (410) is integrally welded on the inner side of the track car (409), and two calibration shells (411) are distributed at the two ends of the top and the bottom of the vertical pipe (410) and form telescopic adjustable assembly with the vertical pipe (410).
5. The fatigue testing machine for predicting the high cycle fatigue life of the metal material according to claim 4, wherein a first screw rod (413) is assembled in the calibration shell (411) in a sliding manner through an assembling mode of a sliding block and a sliding rail, one end of the first screw rod (413) is fixedly connected with a corresponding measuring meter (415), a screw tube is screwed on the outer surface of the middle part of the first screw rod (413), the screw tube is rotatably installed in the calibration shell (411), a power mechanism (412) is arranged in the calibration shell (411), and the output end of the power mechanism (412) is assembled with the screw tube through a gear set (414) in a transmission manner.
6. The fatigue testing machine for predicting the high cycle fatigue life of the metal material of claim 5, wherein limiting holes (416) are formed in the upper surface of the annular rail (407) in a circumferential array mode, top beads (417) are elastically and telescopically assembled in the middle of the surface of the railway car (409) through springs (418), the top beads (417) are detachably embedded into the corresponding limiting holes (416), traction ropes (419) are connected to the outer arc surfaces of the railway car (409), and handles (420) are connected to the two ends of the traction ropes (419).
7. The fatigue testing machine for predicting the high cycle fatigue life of a metal material according to claim 1, wherein the clamp (6) is provided with disk teeth (601) in an annular array near an edge of one end of the corresponding clamp assembly (107).
8. The fatigue testing machine for predicting the high cycle fatigue life of a metal material according to claim 7, wherein the torsion imparting unit (5) comprises a ring support seat (501) and a torsion plate (506), the ring support seat (501) is fixedly mounted on the surface of the test bed machine (1), a ring plate (502) is rotatably assembled on the inner edge of the ring support seat (501), an extension plate (503) extending to the outer side of the ring support seat (501) is integrally arranged on one side of the ring plate (502), a hydraulic cylinder (504) is arranged on the surface of the test bed machine (1), and the output end of the hydraulic cylinder (504) is connected with the extension plate (503).
9. The fatigue testing machine for predicting the high cycle fatigue life of a metal material according to claim 8, wherein the torsion disc (506) is located right above the ring support seat (501), the ring disc (502) is connected with the torsion disc (506) through inclined connecting columns (505) distributed in an array manner, latch grooves (507) for embedding disc teeth (601) are formed in the array manner of the torsion disc (506), a second screw rod (509) is connected in the interior of the torsion disc (506) in an array manner in a threaded manner, and the tail ends of the second screw rod (509) are connected with top tooth blocks (508) for propping against corresponding disc teeth (601).
10. A method for testing the high cycle fatigue life of a metal material by using the fatigue testing machine according to any one of claims 1-9, which is characterized by comprising the following specific steps: equipment and sample preparation, namely preheating and starting the equipment, preparing a sample according to a standard, ensuring that the size and the surface are free of defects, and installing corresponding components in advance when high temperature/torsion endowing test is carried out; The method comprises the steps of clamping and centering a sample, namely assembling a clamping assembly (107) to the upper end and the lower end of a testing machine, assembling a corresponding clamp (6), placing the sample into the clamp (6) for preliminary fixing, and monitoring coaxiality by using a coaxial calibration assembly (4); setting parameters and initializing load, namely setting sample parameters, test numbers and dates in software, setting dynamic load amplitude and frequency, and configuring protection parameters; The test execution and data acquisition comprise the steps of starting static load firstly, starting dynamic load after stable reading, capturing crack initiation in real time through an acoustic emission sensor or an infrared thermal imaging technology during dynamic monitoring, replacing similar materials to perform fatigue test under a high temperature/torsion state, giving high temperature and torsion loads through a high temperature simulation assembly (3) and a torsion giving assembly (5), repeating the test execution operation, and recording data.

Description

Fatigue testing machine and method for predicting high cycle fatigue life of metal material Technical Field The invention belongs to the technical field of test equipment, and particularly relates to a fatigue testing machine and a testing method for predicting high-cycle fatigue life of a metal material. Background The working principle of the high-frequency fatigue testing machine is mainly based on a mechanical resonance principle, high-frequency alternating load is generated through an electromagnetic or motor driving system, high-efficiency testing of material fatigue performance is achieved, the high-frequency fatigue testing machine comprises a sample, a configuration mass block, a spring system and a vibration exciter, when the frequency of exciting force generated by the vibration exciter is consistent with the natural frequency of the system, the system resonates, high-amplitude alternating load can be generated on the sample through low-power input, and the high-frequency fatigue testing machine is suitable for high-rigidity materials (such as metals). Problems of the prior art: The coaxiality deviation causes data distortion, namely, the clamp of the fatigue testing machine and the insufficient coaxiality of two ends of a material can introduce additional bending stress to the material, so that the actual stress of a sample deviates from a theoretical value, and the accuracy of a fatigue life test result is obviously affected; The fatigue testing machine has the advantages that the fatigue testing machine is low in multi-axis loading capacity, is limited to single-axis or simple tensile and compression testing, is difficult to simulate complex stress states (such as torsion and bending composite load), has extremely low environmental simulation, has obvious influence on fatigue behaviors due to environmental factors such as high temperature, and is lack of an integrated environment simulation module. Disclosure of Invention The invention aims to provide a fatigue testing machine and a testing method for predicting the high cycle fatigue life of a metal material, which can solve the problems of data distortion, functional limitation and insufficient scene adaptation caused by coaxiality deviation. The technical scheme adopted by the invention is as follows: The utility model provides a metal material high cycle fatigue life predicts and uses fatigue testing machine, includes that experimental end machine and electromagnetism high frequency take place the organism, and the surface of experimental end machine is provided with the spiral shell tubular column, and experimental end machine surface is provided with the guide arm that supplementary electromagnetism high frequency takes place the organism and goes up and down, electromagnetism high frequency takes place the organism lower surface and is provided with the counter weight platform, experimental end machine surface and counter weight platform lower surface all have anchor clamps through the centre gripping subassembly centre gripping equipment that sets up still include: The high-temperature simulation assembly comprises a high-temperature generator body and an adjustable framework I for installing the high-temperature generator body, wherein the adjustable framework I is assembled with a screw column and a guide rod, and the two high-temperature generator bodies are assembled to heat a metal material; The coaxial calibration assembly comprises a calibration shell and an adjustable framework II for installing the calibration shell, wherein the adjustable framework II is assembled with a screw column and a guide rod, one ends of the two calibration shells are respectively and adjustably provided with a measuring meter, and the two measuring meters are distributed at two ends of a metal material and used for detecting coaxiality; and the torsion imparting component is arranged on the surface of the test bed machine and is matched with a clamp positioned below to impart torsion load to the metal material. The inner wall of the high-temperature generator body is embedded with a ceramic liner, and a heating element is arranged in the ceramic liner. The adjustable framework II comprises a framework III and a framework IV, the framework III and the framework IV on the same side are jointly assembled with a track II, the two sides of the track II are jointly assembled with a vertical sliding rack in a damping sliding manner, a hexagonal vertical rack is fixedly assembled in the middle of the vertical sliding rack, and fork supports used for supporting corresponding clamping assemblies are fixedly installed at the top end and the bottom end of the hexagonal rack. The utility model discloses a telescopic adjustable assembly device for the railway is characterized in that a ring support is fixedly arranged in the middle of the inner side of the hexagonal stand, a ring rail is integrally arranged at the inner edge of the ring support, a railway car is a