Blade mechanical test fixture, mechanical test system and mechanical test method

Abstract

The invention discloses a blade mechanical test fixture, a mechanical test system and a mechanical test method, and relates to the technical field of material performance testing, the blade mechanical test fixture comprises a fixing assembly and a force application assembly; the fixing assembly comprises a base, a supporting assembly and a clamping assembly, the base is installed on a base of the testing machine, the supporting assembly is arranged on the base and used for supporting the clamping assembly, the clamping assembly is used for fixing one end of the blade sample, and the clamping assembly is provided with an arc-shaped clamping face attached to the surface of the end of the blade sample; the force application assembly is connected to an actuator of the testing machine, so that the force application assembly can apply a cyclic load to the other end of the blade sample. The blade mechanical test fixture provided by the invention can accurately simulate the real stress working condition of a blade component while realizing reliable clamping of the blade component, and obtains reliable bending fatigue performance data.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of material performance testing, and more particularly to a blade mechanical testing fixture, a mechanical testing system and a mechanical testing method. BACKGROUND

[0002] Key structural components such as aero-engine blades and turbine blades bear complex alternating loads for a long time during service, and fatigue fracture is one of the main failure modes. Therefore, accurate fatigue mechanical performance testing of blade materials and structural components is an important prerequisite for ensuring safety and reliability, predicting life and optimizing design.

[0003] When performing a bending fatigue test, an electro-hydraulic servo fatigue testing machine and the like equipment are usually required, and a corresponding fixture system is also required. However, the bending fatigue testing machine is usually equipped with a general tooling, such as a four-point bending or three-point bending tooling. These toolings are mainly used for loading standard samples of different materials with regular geometric shapes. However, for blade components with complex curved surface shapes and irregular cross sections, the above general fixture is difficult to achieve stable and reliable clamping. If forced clamping is performed, stress concentration may occur at the clamping position, the sample may be damaged, and the sample may also slide or change its posture during the test, thereby introducing additional measurement errors, failing to truly reflect the stress state and fatigue performance of the blade under actual working conditions, and failing to ensure the accuracy and repeatability of the test results.

[0004] Therefore, how to reliably clamp the blade component while accurately simulating the actual stress working condition and obtaining reliable bending fatigue performance data has become a technical problem to be solved by those skilled in the art. SUMMARY

[0005] Therefore, how to reliably clamp the blade component while accurately simulating the actual stress working condition and obtaining reliable bending fatigue performance data has become a technical problem to be solved by those skilled in the art.

[0006] Another object of the present application is to provide a mechanical testing system having the blade mechanical testing fixture.

[0007] Another object of the present application is to provide a mechanical testing method using the mechanical testing system.

[0008] To achieve the above object, the present application provides the following technical solutions:

[0009] A blade mechanical testing fixture, comprising:

[0010] A fixing assembly, which comprises a base, a supporting assembly and a clamping assembly, the base is used for being mounted on a base of a fatigue testing machine, the supporting assembly is arranged on the base and is used for supporting the clamping assembly, the clamping assembly is used for fixing one end of a blade sample, and the clamping assembly has an arc-shaped clamping surface which is matched with an end surface of the blade sample;

[0011] A force applying assembly, which is used for being connected to an actuator of the fatigue testing machine, so that the force applying assembly can apply a cyclic load to the other end of the blade sample.

[0012] Optionally, in the blade mechanical testing fixture, the clamping assembly comprises a first clamping piece and a second clamping piece, the first clamping piece and the second clamping piece are connected through a connecting assembly, so as to clamp the blade sample between the first clamping piece and the second clamping piece.

[0013] Optionally, in the blade mechanical testing fixture, an arc-shaped groove is arranged on the first clamping piece, and an arc-shaped protrusion which is matched with the arc-shaped groove is arranged on the second clamping piece, and the arc-shaped clamping surface comprises an inner surface of the arc-shaped groove and an outer surface of the arc-shaped protrusion.

[0014] Optionally, in the blade mechanical testing fixture, the connecting assembly comprises a plurality of adjusting screws, a first mounting hole which is matched with the adjusting screws is arranged on the first clamping piece, a second mounting hole which is matched with the first mounting hole is arranged on the second clamping piece, and the adjusting screws are used for being arranged in the first mounting hole and the second mounting hole, so as to lock the first clamping piece and the second clamping piece.

[0015] Optionally, in the blade mechanical testing fixture, the force applying assembly comprises a connecting seat and a contact head, the connecting seat has a mounting groove in which the contact head is mounted, and the contact head is rotatably arranged in the mounting groove, and the contact head is used for rolling contact with the blade sample to apply a load.

[0016] Optionally, in the blade mechanical testing fixture, the contact head is provided with an arc-shaped force applying surface which is matched with a surface of the blade sample.

[0017] Optionally, in the blade mechanical testing fixture, the supporting assembly comprises a supporting rod and a supporting seat which is located at an end of the supporting rod, one end of the supporting rod is connected with the base through the supporting seat, and the other end of the supporting rod is connected with the clamping assembly through the supporting seat.

[0018] Optionally, in the blade mechanical test fixture, a connecting hole is arranged on the base for connecting with the base of the fatigue testing machine through a fastener, the connecting hole is a strip-shaped hole, and the strip-shaped hole is used to adjust the distance between the fixing assembly and the force applying assembly on the fatigue testing machine.

[0019] A mechanical test system, comprising a fatigue testing machine and the blade mechanical test fixture according to any one of the preceding claims, wherein the base of the fixing assembly is mounted on the base of the fatigue testing machine, and the force applying assembly is connected to the actuator of the fatigue testing machine.

[0020] A mechanical test method, using the mechanical test system as described above, comprising the steps of:

[0021] mounting the fixture, mounting the base of the fixing assembly on the base of the fatigue testing machine, and connecting the force applying assembly with the actuator of the fatigue testing machine;

[0022] clamping the blade sample, fixing one end of the blade sample in the clamping assembly of the fixing assembly, so that the arc-shaped clamping surface of the clamping assembly is in contact with the outer surface of the blade sample, and the other end of the blade sample is overlapped on the force applying assembly;

[0023] applying load, controlling the actuator of the fatigue testing machine to drive the force applying assembly to apply a preset cyclic load on the blade sample, until the blade sample fails due to fatigue or reaches a predetermined number of cycles.

[0024] The blade mechanical test fixture provided by the application can effectively solve the technical problem that blade components with irregular curved surfaces are difficult to be stably clamped on a standard testing machine, and improve the applicability of the fixture. Meanwhile, the arc-shaped clamping surface of the clamping assembly can ensure the firmness of the clamping of the blade sample, avoid the sliding and posture change of the blade sample during the test process, and uniformly disperse the clamping force, so as to prevent early failure of the blade sample caused by stress concentration, thereby ensuring that the test data can truly reflect the fatigue performance of the blade, and improving the accuracy and reliability of the test results. In addition, the fixture has a simple structure, and can be conveniently used with existing standard equipment such as an electro-hydraulic servo fatigue testing machine, without the need to modify the testing machine, and has good universality and practical value. Moreover, the blade mechanical test fixture can accurately simulate the stress working condition of the blade in actual work, and obtain reliable fatigue life data, thereby providing an important experimental basis for the optimization design, life prediction and reliability evaluation of the blade structure.

[0025] The technical features mentioned above, the technical features to be mentioned below, and the technical features shown in the drawings alone can be combined with each other arbitrarily, as long as the combined technical features are not contradictory to each other. All feasible combinations of features are explicitly described herein. Any one of the multiple sub-features included in the same sentence can be independently applied, and does not have to be applied together with other sub-features. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only embodiments of the present application, and those skilled in the art can obtain other drawings according to the provided drawings without creative labor.

[0027] Figure 1 An isometric view of the blade mechanical test fixture provided by the embodiment of the present application is shown in the drawings;

[0028] Figure 2 An isometric view of the blade mechanical test fixture provided by the embodiment of the present application is shown in the drawings;

[0029] Figure 3A side view of the blade mechanical test fixture assembly provided by the embodiment of the present application;

[0030] Figure 4 A top view of the blade mechanical test fixture assembly provided by the embodiment of the present application;

[0031] Figure 5 An isometric view of the force applying assembly provided by the embodiment of the present application;

[0032] Figure 6 A front view of the force applying assembly provided by the embodiment of the present application;

[0033] Figure 7 A side view of the force applying assembly provided by the embodiment of the present application;

[0034] Figure 8 A top view of the force applying assembly provided by the embodiment of the present application;

[0035] Figure 9 An isometric view of the fixing assembly provided by the embodiment of the present application;

[0036] Figure 10 A front view of the fixing assembly provided by the embodiment of the present application;

[0037] Figure 11 A side view of the fixing assembly provided by the embodiment of the present application;

[0038] Figure 12 A top view of the fixing assembly provided by the embodiment of the present application;

[0039] Figure 13 A flowchart of the mechanical test method provided by the embodiment of the present application.

[0040] Wherein, 100 is the blade mechanical test fixture, 10 is the fixing assembly, 11 is the base, 12 is the supporting assembly, 121 is the supporting rod, 122 is the supporting seat, 13 is the clamping assembly, 131 is the arc-shaped clamping surface, 132 is the first clamping piece, 1321 is the arc-shaped groove, 133 is the second clamping piece, 1331 is the arc-shaped protrusion, 134 is the connecting assembly, 1341 is the adjusting screw rod, 20 is the force applying assembly, 21 is the connecting seat, 211 is the mounting groove, 22 is the contact head, 221 is the arc-shaped force applying surface, 200 is the electro-hydraulic servo fatigue testing machine, and 300 is the blade sample. DETAILED DESCRIPTION

[0041] The core of the present application is to provide a blade mechanical test fixture, which can accurately simulate the real stress working condition and obtain reliable bending fatigue performance data while realizing reliable clamping of the blade type component.

[0042] Another core of the present application is to provide a mechanical testing system with the above-mentioned blade mechanical testing fixture.

[0043] Another core of the present application is to provide a mechanical testing method using the above-mentioned mechanical testing system.

[0044] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0045] When performing blade bending fatigue test, it is usually necessary to use equipment such as electro-hydraulic servo fatigue testing machine and cooperate with corresponding fixture system. However, the bending fatigue testing machine is usually equipped with general tooling, such as four-point bending or three-point bending tooling, which is mainly used for loading standard samples of different materials with regular geometric shapes. For blade components with complex curved surface shape and irregular cross section, the above-mentioned general fixture is difficult to realize stable and reliable clamping. If forced clamping, not only the stress concentration is easy to occur at the clamping part, the sample is damaged, but also the relative sliding or posture change of the sample may occur during the test process, thereby introducing additional measurement error, which cannot truly reflect the stress state and fatigue performance of the blade under actual working condition, and the accuracy and repeatability of the test result are difficult to guarantee.

[0046] Therefore, as Figure 1As shown, the embodiment of the present application discloses a blade mechanical test fixture, which comprises a fixing assembly 10 and a force applying assembly 20. By arranging the clamping assembly 13 matched with the surface of the blade sample 300, the technical difficulties that the blade components with irregular curved surface are difficult to be stably clamped on the standard testing machine are effectively solved, and the applicability of the fixture is improved. Meanwhile, the arc-shaped clamping surface 131 of the clamping assembly 13 can ensure the firmness of the clamping of the blade sample 300, avoid the sliding and attitude change of the blade sample 300 during the test process, and can uniformly disperse the clamping force, prevent the early failure of the blade sample 300 caused by stress concentration, so as to ensure that the test data can truly reflect the fatigue performance of the blade, and improve the accuracy and reliability of the test results. In addition, the fixture of the present application has simple structure, can be conveniently used with the existing standard equipment such as electro-hydraulic servo fatigue testing machine 200, does not need to be modified, has good universality and practical value. Moreover, the stress working condition of the blade in actual work can be accurately simulated, and reliable fatigue life data can be obtained, which provides important experimental basis for the optimization design, life prediction and reliability evaluation of the blade structure.

[0047] The specific embodiments of the blade mechanical test fixture disclosed by the present application will be explained and described below. Figures 1 to 12 The specific embodiments of the blade mechanical test fixture disclosed by the present application will be explained and described below.

[0048] As Figures 1 to 4As shown, the fixing assembly 10 can include a base 11, a supporting assembly 12 and a clamping assembly 13. Among them, the base 11 can be fixed on the base of the fatigue testing machine 200 through fasteners such as bolts, and one end of the supporting assembly 12 can be arranged on the base 11, and the other end of the supporting assembly 12 can be connected with the clamping assembly 13, and the clamping assembly 13 has an arc clamping surface 131 which is in contact with the end surface of the blade sample 300, so that the clamping assembly 13 clamps one end of the blade sample 300, effectively solving the technical pain point that the blade type component with irregular curved surface shape is difficult to be stably clamped on the standard testing machine, and improving the applicability of the clamp. At the same time, the arc clamping surface 131 of the clamping assembly 13 can ensure the firmness of the clamping of the blade sample 300, avoid the sliding and attitude change of the blade sample 300 during the test process, and can uniformly disperse the clamping force, prevent the early failure of the blade sample 300 caused by stress concentration, so as to ensure that the test data can truly reflect the fatigue performance of the blade, and improve the accuracy and reliability of the test results. And the force applying assembly 20 can be connected to the actuator of the fatigue testing machine 200, so that the actuator of the fatigue testing machine 200 drives the force applying assembly 20 to apply cyclic load to the other end of the blade sample 300, so that the fatigue test of the blade sample 300 can be carried out.

[0049] In some embodiments, as shown in Figures 9 to 12 As shown, the base 11 can adopt a U-shaped metal plate with the same width as the fatigue testing machine 200, and the two ends of the base 11 can be provided with connecting holes connected with the base of the fatigue testing machine 200. Among them, the connecting hole can adopt a strip-shaped hole along the length direction of the blade sample, so that the connecting hole can be matched with fasteners such as bolts to adjust the distance between the base 11 and the fatigue testing machine 200, so as to meet the fatigue test requirements of blade samples with different lengths.

[0050] In some embodiments, in order to ensure the stability of the base 11, ballast blocks can be fixed at both ends of the base 11, and the ballast blocks are detachably connected with both ends of the base 11, so that the base 11 can be ballasted according to actual needs to prevent the fixing assembly 10 from overturning and ensure the stability of the base 11.

[0051] Of course, the base 11 can also be directly connected and fixed with the supporting surface such as the ground through foundation bolts, so as to ensure the stability and reliability of the fixing assembly 10 clamping the blade sample 300, and prevent the blade sample 300 from deviating during the test process.

[0052] In some embodiments, as shown in Figure 2 and Figure 10As shown, the support assembly 12 can include a support rod 121 and a support base 122 located at the end of the support rod 121. Wherein the support base 122 can adopt a rectangular block, and the support base 122 and the support rod 121 can be fixedly connected by welding, and one end of the support rod 121 is detachably connected with the base 11 through the support base 122 by a bolt or other fastener, and the other end of the support rod 121 is detachably connected with the clamping assembly 13 through the support base 122 by a bolt or other fastener, so as to improve the connection area between the two ends of the support rod 121 and the base 11 and the clamping assembly 13 respectively, and ensure the reliability of the connection between the two ends of the support rod 121 and the base 11 and the clamping assembly 13 respectively.

[0053] In some embodiments, as shown in Figures 1 to 3 As shown, the clamping assembly 13 can include a first clamping piece 132 and a second clamping piece 133. Wherein the first clamping piece 132 is located below the second clamping piece 133, and the first clamping piece 132 can be detachably connected with the support base 122 of the support rod 121 by a bolt or other fastener, and the first clamping piece 132 and the second clamping piece 133 can be connected by a connecting assembly 134 to clamp the blade sample 300 between the first clamping piece 132 and the second clamping piece 133, thereby achieving clamping and fixing of the blade sample 300.

[0054] In some embodiments, as shown in Figure 2 As shown, the first clamping piece 132 can be provided with an arc-shaped groove 1321, and the second clamping piece 133 is provided with an arc-shaped protrusion 1331 matched with the arc-shaped groove 1321, and the arc-shaped clamping surface 131 can include the inner surface of the arc-shaped groove 1321 and the outer surface of the arc-shaped protrusion 1331, so that when the blade sample 300 is clamped between the arc-shaped groove 1321 and the arc-shaped protrusion 1331, it can be fitted with the outer surface of the blade sample 300, to ensure the firmness of the clamping of the blade sample 300, and avoid the sliding and attitude change of the blade sample 300 during the test.

[0055] In some embodiments, as shown in Figure 2As shown, the first clamping piece 132 can adopt a rectangular plate, and a first clamping portion can be formed on the first clamping piece 132 and extend towards the second clamping piece 133, and an arc-shaped recess 1321 can be formed on the first clamping portion and recessed towards the second clamping piece 133. The second clamping piece 133 can adopt a rectangular plate with the same size as the first clamping piece 132, and a second clamping portion can be formed on the second clamping piece 133 and extend towards the first clamping piece 132, and an arc-shaped protrusion 1331 can be formed on the second clamping portion and protrude towards the first clamping piece 132. The outer surface of the arc-shaped protrusion 1331 matches the inner surface of the arc-shaped recess 1321, so that when the first clamping piece 132 and the second clamping piece 133 are connected through the connecting assembly 134, the blade sample 300 can be firmly clamped between the arc-shaped recess 1321 and the arc-shaped protrusion 1331, and the blade sample 300 can be prevented from sliding and changing posture during the test, and the clamping force can be uniformly dispersed to prevent early failure of the blade sample 300 due to stress concentration, thereby ensuring that the test data truly reflects the fatigue performance of the blade and improving the accuracy and reliability of the test results.

[0056] In some embodiments, as shown in FIG. 1, Figures 1 to 4 As shown, the connecting assembly 134 can include a plurality of adjusting screws 1341, i.e., the adjusting screws 1341 can adopt two, three, four or more, and the first clamping piece 132 is provided with a first mounting hole adapted to the adjusting screw 1341, i.e., the first mounting hole can adopt two, three, four or more, which is the same number as the adjusting screw 1341, and the second clamping piece 133 is provided with a second mounting hole adapted to the first mounting hole, i.e., the second mounting hole can adopt two, three, four or more, which is the same number as the first mounting hole, and the adjusting screw 1341 can be arranged in the first mounting hole and the second mounting hole to lock the first clamping piece 132 and the second clamping piece 133.

[0057] In some embodiments, the first mounting hole of the first clamping piece 132 can adopt a threaded hole, and the second mounting hole on the second clamping piece 133 can adopt a light hole, so that the adjusting screw 1341 can pass through the second mounting hole on the second clamping piece 133 and be screwed with the first mounting hole, thereby adjusting the clamping force between the first clamping piece 132 and the second clamping piece 133. Of course, the first mounting hole of the first clamping piece 132 and the second mounting hole on the second clamping piece 133 can both adopt light holes, so that the adjusting screw 1341 can pass through the second mounting hole on the second clamping piece 133 and the first mounting hole of the first clamping piece 132 in sequence, and be screwed with the locking nut, thereby adjusting the clamping force between the first clamping piece 132 and the second clamping piece 133.

[0058] In some embodiments, as shown in FIG. 1, Figures 5 to 8As shown, the force applying assembly 20 can include a connecting seat 21 and a contact head 22. As shown in Figure 5 and Figure 6 As shown, the connecting seat 21 can have a mounting groove 211 for mounting the contact head 22, and the contact head 22 can be rotatably arranged in the mounting groove 211, so that the contact head 22 and the vane sample 300 can be loaded through rolling contact, thereby reducing the friction in the length direction of the vane sample 300, reducing the wear of the vane sample 300, and ensuring the accuracy of the fatigue test data of the vane sample 300. It should be noted that the contact head 22 can be made of non-metallic materials such as acrylic, so as to reduce the wear of the vane sample 300 and ensure the accuracy of the fatigue test data of the vane sample 300.

[0059] In some embodiments, as shown in Figure 5 、 Figure 6 and Figure 8 The contact head 22 can be provided with an arc-shaped force applying surface 221 that is in contact with the surface of the vane sample 300, so that the contact head 22 and the surface of the vane sample 300 are better in contact, preventing early failure of the vane sample 300 due to stress concentration, thereby ensuring that the test data can truly reflect the fatigue performance of the vane and improving the accuracy and reliability of the test results. As shown, the arc-shaped force applying surface 221 can be a single-leaf hyperboloid, which can prevent the vane sample 300 from being separated from the contact head 22 while being in contact with the surface of the vane sample 300, thereby limiting the vane sample 300.

[0060] The vane mechanical test fixture 100 disclosed in the embodiments of the present application can be installed on the base of the testing machine by the base 11 of the fixing assembly 10, and the clamping assembly 13 is fixed on the base 11 by the supporting assembly 12, and the clamping assembly 13 has an arc-shaped clamping surface 131 that is in contact with the end surface of the vane sample 300, so that the clamping assembly 13 can fix one end of the vane sample 300. In addition, the force applying assembly 20 can be connected with the actuator of the testing machine, so that the force applying assembly 20 can apply a cyclic load to the other end of the vane sample 300.

[0061] The blade mechanical testing fixture 100 disclosed in this application effectively solves the technical problem of unstable clamping of blade-like components with irregular curved surfaces on standard testing machines by setting a clamping component 13 adapted to the surface of the blade sample 300, thus improving the applicability of the fixture. Simultaneously, the arc-shaped clamping surface 131 of the clamping component 13 ensures the firmness of the blade sample 300, preventing slippage and attitude changes during testing, and evenly distributing the clamping force to prevent premature failure of the blade sample 300 due to stress concentration. This ensures that the test data accurately reflects the fatigue performance of the blade, improving the accuracy and reliability of the test results. Furthermore, the fixture structure of this application is simple in design and can be easily used with existing standard equipment such as the electro-hydraulic servo fatigue testing machine 200 without requiring modification to the testing machine, demonstrating good versatility and practical value. Moreover, it can accurately simulate the stress conditions of the blade in actual operation, obtaining reliable fatigue life data, providing important experimental basis for the optimized design, life prediction, and reliability assessment of blade structural components.

[0062] This application also discloses a mechanical testing system, including a fatigue testing machine 200 and a blade mechanical testing fixture 100 as disclosed in the above embodiments. Therefore, it possesses all the technical effects of the blade mechanical testing fixture 100 described above, and will not be repeated here. The fatigue testing machine 200 may include a base and an actuator. The base 11 of the fixing component 10 can be mounted on the base using fasteners such as bolts. Simultaneously, the force application component 20 can be connected to the actuator to apply a load to the blade sample 300 by driving the force application component 20 through the fatigue testing machine 200.

[0063] like Figure 13 As shown in the embodiments, this application also discloses a mechanical testing method, which uses the mechanical testing system disclosed in the above embodiments. Therefore, it has all the technical effects of the above mechanical testing system, and will not be described again here. The mechanical testing method may include step S100 of installing a fixture, step S200 of clamping the blade sample, and step S300 of applying a load.

[0064] Step S100: Install the fixture;

[0065] Adjust the installation position between the base 11 of the fixing component 10 and the base of the fatigue testing machine 200, and install it on the base of the fatigue testing machine 200 with fasteners such as bolts. At the same time, connect the force application component 20 to the actuator of the fatigue testing machine 200.

[0066] Step S200: Clamp the blade sample;

[0067] One end of the blade sample 300 is fixed within the clamping assembly 13 of the fixing assembly 10, such that the arc-shaped clamping surface 131 of the clamping assembly 13 is in contact with the outer surface of the blade sample 300, while the other end of the blade sample 300 overlaps with the force-applying assembly 20. Specifically, one end of the blade sample 300 is placed on the first clamping member 132 of the clamping assembly 13, and the second clamping member 133 is connected and fixed to the first clamping member 132 via the connecting assembly 134, so that the blade sample 300 is clamped between the arc-shaped groove 1321 of the first clamping member 132 and the arc-shaped protrusion 1331 of the second clamping member 133, thereby achieving clamping and fixing of one end of the blade sample 300. The other end of the blade sample 300 overlaps with the contact head 22 of the force-applying assembly 20 to apply a cyclic load to the blade sample 300.

[0068] Step S300: Apply load;

[0069] By controlling the actuator of the fatigue testing machine 200 to drive the force application component 20 to slowly lift and lower, a preset cyclic load is applied to the blade specimen 300 until the blade specimen 300 fails due to fatigue or reaches the predetermined number of cycles.

[0070] By employing the blade testing fixture, mechanical testing system, and mechanical testing method provided in the above embodiments, stable and reliable bending fatigue testing can be performed on blade-like components with specific complex shapes. The obtained fatigue life data has low dispersion and good repeatability, which can truly reflect the fatigue performance of the component under simulated working conditions. This provides important experimental basis for the structural optimization and life assessment of key components of high-end equipment such as aero-engines and steam turbines.

[0071] The terminology used in the above embodiments is for the purpose of describing specific embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions "a," "an," "the," "the," "the," and "this" are intended to also include expressions such as "one or more," unless the context clearly indicates otherwise. It should also be understood that in the embodiments of this application, "one or more" refers to one, two, or more; "and / or" describes the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship.

[0072] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0073] The "multiple" mentioned in the embodiments of this application refers to two or more. It should be noted that in the description of the embodiments of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions and should not be construed as indicating or implying relative importance, nor should they be construed as indicating or implying order.

[0074] The terms "parallel" and "perpendicular" used in this application refer to "basically parallel" and "basically perpendicular" in practical operation. "Basically parallel" can be understood as parallelism with a certain degree of error, and similarly, "basically perpendicular" can be understood as perpendicularity with a certain degree of error.

[0075] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A blade mechanics testing fixture, characterized in that, include: The fixing component (10) includes a base (11), a support component (12), and a clamping component (13). The base (11) is used to be mounted on the base of the fatigue testing machine (200). The support component (12) is disposed on the base (11) and is used to support the clamping component (13). The clamping component (13) is used to fix one end of the blade sample (300). The clamping component (13) has an arc-shaped clamping surface (131) that fits against the end surface of the blade sample (300). Force application component (20), which is connected to the actuator of the fatigue testing machine (200) so that the force application component (20) can apply a cyclic load to the other end of the blade specimen (300).

2. The blade mechanical testing fixture according to claim 1, characterized in that, The clamping assembly (13) includes a first clamping member (132) and a second clamping member (133), the first clamping member (132) and the second clamping member (133) being connected by a connecting assembly (134) to clamp the blade sample (300) between the first clamping member (132) and the second clamping member (133).

3. The blade mechanical testing fixture according to claim 2, characterized in that, The first clamping member (132) is provided with an arc-shaped groove (1321), and the second clamping member (133) is provided with an arc-shaped protrusion (1331) adapted to the arc-shaped groove (1321). The arc-shaped clamping surface (131) includes the inner surface of the arc-shaped groove (1321) and the outer surface of the arc-shaped protrusion (1331).

4. The blade mechanical testing fixture according to claim 2, characterized in that, The connecting assembly (134) includes a plurality of adjusting screws (1341), and the first clamping member (132) is provided with a first mounting hole adapted to the adjusting screws (1341), and the second clamping member (133) is provided with a second mounting hole adapted to the first mounting hole. The adjusting screws (1341) are used to pass through the first mounting hole and the second mounting hole to lock the first clamping member (132) and the second clamping member (133).

5. The blade mechanical testing fixture according to claim 1, characterized in that, The force-applying component (20) includes a connecting seat (21) and a contact head (22). The connecting seat (21) has a mounting groove (211) for mounting the contact head (22). The contact head (22) is rotatably disposed in the mounting groove (211) and is used to roll into contact with the blade sample (300) to apply a load.

6. The blade mechanical testing fixture according to claim 5, characterized in that, The contact head (22) is provided with an arc-shaped force-applying surface (221) for adhering to the surface of the blade sample (300).

7. The blade mechanical testing fixture according to claim 1, characterized in that, The support assembly (12) includes a support rod (121) and a support seat (122) located at the end of the support rod (121). One end of the support rod (121) is connected to the base (11) through the support seat (122), and the other end of the support rod (121) is connected to the clamping assembly (13) through the support seat (122).

8. The blade mechanical testing fixture according to claim 1, characterized in that, The base (11) is provided with a connection hole for connecting to the base of the fatigue testing machine (200) by fasteners. The connection hole is a strip hole and is used to adjust the distance between the fixing component (10) and the force application component (20) on the fatigue testing machine (200).

9. A mechanical testing system, characterized in that, The device includes a fatigue testing machine (200) and a blade mechanical testing fixture (100) as described in any one of claims 1 to 8. The fatigue testing machine (200) includes a base and an actuator. The base (11) of the fixing component (10) is mounted on the base, and the force application component (20) is connected to the actuator.

10. A mechanical testing method, employing the mechanical testing system as described in claim 9, characterized in that, Including the following steps: Install the fixture, mount the base (11) of the fixing component (10) on the base of the fatigue testing machine (200), and connect the force application component (20) to the actuator of the fatigue testing machine (200); Clamp the blade sample and fix one end of the blade sample (300) in the clamping component (13) of the fixing component (10) so that the arc-shaped clamping surface (131) of the clamping component (13) is in contact with the outer surface of the blade sample (300) and the other end of the blade sample (300) is attached to the force application component (20). A load is applied, and the actuator of the fatigue testing machine (200) is controlled to drive the force application component (20) to apply a preset cyclic load to the blade specimen (300) until the blade specimen (300) fails due to fatigue or reaches a predetermined number of cycles.

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