CN115901438B - A method for testing the stiffness and fatigue of composite material stabilizer bars - Google Patents
A method for testing the stiffness and fatigue of composite material stabilizer barsInfo
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- CN115901438B CN115901438B CN202211284061.6A CN202211284061A CN115901438B CN 115901438 B CN115901438 B CN 115901438B CN 202211284061 A CN202211284061 A CN 202211284061A CN 115901438 B CN115901438 B CN 115901438B
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- stabilizer bar
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- fatigue
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Abstract
The invention relates to a method for testing rigidity and fatigue of a composite material stabilizer bar, which comprises the following steps of placing the stabilizer bar on a bottom plate, positioning the stabilizer bar through a rubber bushing, fixing the stabilizer bar on a rack through an end clamp or a joint after adjusting the stabilizer bar in place, connecting a test rack with a test host, starting the test host, controlling a servo motor through a controller, applying rated load to the test joint, transmitting the rated load to the stabilizer bar through the test rack, recording displacement and load in the loading process, calculating the rigidity value of the stabilizer bar through a formula K=F/S, or setting the reciprocating frequency of the test joint of the host through the controller, recording the number of periodic motions of the final stabilizer bar, and recording the number of periodic motions of the final stabilizer bar as T, namely the fatigue life of the stabilizer bar. The invention solves the problems that the rigidity and fatigue performance cannot be tested simultaneously in the prior art, and the structure is large and the operation is complex.
Description
[ Field of technology ]
The invention relates to a performance test method for automobile parts, in particular to a method for testing rigidity and fatigue of a composite stabilizer bar, and belongs to the technical field of material performance detection.
[ Background Art ]
When the automobile parts are produced, a series of tests are required to be carried out on the produced samples so as to meet the performance requirements of the parts. The rigidity and fatigue of the parts are the most important test items for detecting the torsion resistance and fatigue resistance of the parts.
The stabilizer bar is also called an anti-tilting bar and a balance bar, and is an auxiliary elastic element in the automobile suspension. The equipment used for testing the rigidity and fatigue of the stabilizer bar in the prior art is large in size, complex in mechanism and operation and inconvenient to use, meanwhile, different equipment is required to be used for testing the rigidity and fatigue, a large amount of resources are consumed, meanwhile, the performance of the stabilizer bar made of the composite material is damaged, and the stabilizer bar cannot be tested for different stabilizer bar joints.
Therefore, to solve the above-mentioned problems, it is necessary to provide an innovative method for testing the stiffness and fatigue of a composite stabilizer bar to overcome the drawbacks of the prior art.
[ Invention ]
The invention aims to provide a method for testing rigidity and fatigue of a composite stabilizer bar, which aims to solve the problems that test equipment in the prior art cannot test rigidity and fatigue performance simultaneously, is large in size and complex in operation and the like, and can effectively avoid damage to the stabilizer bar.
The technical scheme adopted by the invention is that the method for testing the rigidity and fatigue of the composite stabilizer bar is used for testing the rigidity and fatigue of the stabilizer bar, and the device comprises a test host, a test bench and a control cabinet, wherein the test bench is connected with the test host through a universal joint;
When the rigidity test is carried out on the stabilizer bar, the method comprises the following steps:
1-1), placing the stabilizer bar on a bottom plate, and positioning the stabilizer bar through a rubber bushing;
1-2) after being adjusted to a proper position, the stabilizer bar is fixed on the rack through an end clamp or a joint;
1-3), connecting the test bench with a test host;
1-4), starting a test host, controlling a servo motor through a controller, applying a rated load to a test joint, transmitting the rated load to a stabilizer bar through a test bed, and recording displacement and load in the loading process;
1-5), calculating a stabilizer bar stiffness value through a formula K=F/S, wherein K is a stabilizer bar linear stiffness value, F is a load applied by a main machine, and S is a displacement of the end part of the stabilizer bar;
when the stabilizer bar is subjected to fatigue test, the method comprises the following steps:
2-1), placing the stabilizer bar on the bottom plate, and positioning the stabilizer bar through the rubber bushing;
2-2) fixing the stabilizer bar on the rack through an end clamp or a joint after the stabilizer bar is integrated to a proper position;
2-3), connecting the test bench with a test host;
2-4), starting a host, setting the reciprocating frequency of a test joint of the host through a controller, and recording the number of periodic motions of a final stabilizer bar;
2-5), recording the secondary number of the final stabilizer bar periodic motion as T, namely the fatigue life of the stabilizer bar.
The method for testing the rigidity and fatigue of the composite material stabilizer bar further comprises the steps that the testing host comprises an upper cross beam, a middle cross beam, a base, a workbench and a servo motor, wherein the upper cross beam and the workbench are fixedly connected together through a plurality of upright posts, the bottoms of the upright posts are fixed on the base, ball screws which are vertically arranged are pivoted on the base, the middle cross beam and the ball screws are matched and drive the middle cross beam to move up and down through the rotation of the ball screws, a testing joint is arranged on the middle cross beam, a sensor is arranged at the upper part of the testing joint, and the servo motor is arranged on the base and drives the ball screws to rotate through a transmission device;
The servo motor is controlled by the output signal of the control cabinet, the motor drives the ball screw to rotate, the middle cross beam is driven by the ball screw to move up and down, the swing rod is linked to move up and down, then the two ends of the stabilizer bar are enabled to move up and down through the connected clamp or joint, and the stabilizer bar is repeatedly loaded by setting the frequency of the output signal of the controller.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the steps that the transmission device is specifically a synchronous belt speed reducer, the sensors adopt a CZL-L-1000 type pressure sensor and a KS15-400-01-L type displacement sensor, and the measuring ranges are 1000KN and 1000mm respectively.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the steps that the test bench comprises a swinging rod, a supporting frame, a clamp, a bottom plate and a rubber bushing, wherein the swinging rod is connected to a test joint of a middle cross beam through a universal joint, the upper portion of the supporting frame is fixedly connected to the swinging rod through a pin shaft, the bottom of the supporting frame is welded and fixed to the bottom plate, the rubber bushing is used for connecting the stabilizer bar to the bottom plate through a bolt so as to enable the stabilizer bar to be axially positioned, the bottom plate is fixed to a workbench, the universal joints are respectively arranged at the lower portions of two ends of the swinging rod, and the lower universal joints are connected with the stabilizer bar through the clamp or the joint.
The method for testing the rigidity and fatigue of the composite material stabilizer bar further comprises the step that the clamp adopts a symmetrical semi-arc structure, and two sides of the clamp are connected and fastened through bolts and nuts so as to clamp the stabilizer bar.
The method for testing the rigidity and fatigue of the composite material stabilizer bar further comprises the steps that the universal joint is specifically a double-joint universal joint, the swinging rod is a hollow aluminum alloy swinging rod, the cross section of the swinging rod is of a concave structure, and the universal joint can slide in the groove in an energy-saving mode.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the steps of arranging corresponding connecting holes at the joint connecting stabilizer bar according to the diameter of the bar body, arranging pin holes with the size corresponding to the universal joint at the other end of the joint, carrying out plasma surface treatment on the surface of the joint connecting the joint and the stabilizer bar before connection, then coating 3MDP460 structural adhesive, and fixing the joint and the universal joint through pin connection at the other end of the joint after the joint and the end of the stabilizer bar of the composite material are solidified and connected.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the steps of setting a connecting hole with a certain length at the joint of the stabilizer bar and the joint according to the diameter of the bar body, then arranging a threaded hole with a size corresponding to that of a metal connecting piece at the other end, carrying out plasma treatment on the connecting hole at the front section before connection, then coating 3MDP460 structural adhesive, and carrying out pin connection with a universal joint through the metal connecting piece after the joint and the stabilizer bar are solidified and connected.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the steps of adopting a U-shaped structure for the joint, enabling the thickness of the joint to be larger than that of the hollow composite stabilizer bar, arranging connecting holes corresponding to the metal connecting pieces on two sides of the joint, preprocessing the surface of the joint before connection, smearing 3MDP460 structural adhesive at the connecting holes, and finally conducting pin connection with the universal joint through the metal connecting pieces.
The method for testing the rigidity and fatigue of the composite stabilizer bar further comprises the step of carrying out load analysis on the test bench before testing, wherein the stress analysis is carried out in the finite element abaqus according to the condition that the stabilizer bar is loaded, the position of the maximum stress of the bench when working is calculated to be at the position of the end clamp, and the maximum stress is smaller than the yield stress of the clamp.
Compared with the prior art, the invention has the following beneficial effects:
1. The test device adopted by the invention not only can test the rigidity of the stabilizer bar, but also can test the fatigue resistance of the stabilizer bar, thereby reducing the number of detection devices, and simultaneously, the test precision is higher, and meanwhile, the stress balance of the two ends of the stabilizer bar can be ensured only by applying a load on one end.
2. The method for testing the rigidity and fatigue of the composite material stabilizer bar can stably clamp the stabilizer bar during testing, and does not damage the performance of the stabilizer bar.
3. The test bed provided by the invention uses hollow aluminum alloy, so that the test bed not only meets the strength requirement of a test, but also is light in weight and small in volume, saves resources, and the swing rod adopts a concave structure, so that the measurement of the stabilizer bar with various rod body sizes is met.
4. The invention aims at stabilizer bars made of different composite materials, adopts different clamps and connectors, and meets the test of stabilizer bars with different structures.
[ Description of the drawings ]
FIG. 1 is a general schematic of a stabilizer bar stiffness and fatigue testing apparatus of the present invention.
Fig. 2 is a schematic structural diagram of the test host in fig. 1.
Fig. 3 is a schematic structural view of the test bench of fig. 1.
Fig. 4 is a schematic view of the assembly of the stabilizer bar and the clamp.
Fig. 5-1 and 5-2 are schematic structural views of the jig of fig. 4.
Fig. 6 is a schematic view of the assembly of the stabilizer bar and the joint.
Fig. 7 is a schematic view of the joint of fig. 6.
Fig. 8 is a schematic view of the assembly of a stabilizer bar and another connector.
Fig. 9 is a schematic view of the joint of fig. 8.
FIG. 10 is a schematic view of the assembly of a stabilizer bar and a composite joint.
Fig. 11 is a schematic structural view of the joint of fig. 10.
Fig. 12 is a perspective view of a metal connector.
Fig. 13 is a perspective view of the swing link.
Fig. 14 is a perspective view of a rubber bushing.
[ Detailed description ] of the invention
Referring to fig. 1 to 14 of the specification, the stiffness and fatigue testing device for the composite stabilizer bar is composed of a testing host machine, a testing stand, a control cabinet and the like.
The testing host machine adopts a frame type structure, not only ensures that the rack has enough rigidity, but also realizes high-efficiency and stable transmission, and comprises an upper beam 10, a middle beam 1, a base 9, a workbench 6, a servo motor 8 and the like. The upper cross beam 10 and the workbench 6 are fastened together through a plurality of upright posts 5, and in the embodiment, 4 three-dimensional bodies 5 are specifically arranged. The bottom of the upright post 5 is fixed on the base 9.
Further, the base 9 is pivotally connected to a ball screw 4 disposed vertically. The middle cross beam 1 is horizontally arranged, a screw nut is arranged on the middle cross beam, the screw nut is matched with the ball screw 4, the middle cross beam 1 is driven to move up and down by rotating the ball screw 4, and the screw nut is matched with the screw nut, so that a gap structure is eliminated, and the transmission precision of the whole machine is greatly improved.
The middle cross beam 1 is provided with a test joint 2 which is linked with the middle cross beam 1. The upper part of the test joint 2 is provided with a sensor 3. The sensor 3 adopts a CZL-L-1000 type pressure sensor and a KS15-400-01-L type displacement sensor, the measuring ranges are respectively 1000KN and 1000mm, the measuring range is increased, and meanwhile, the accuracy is high.
The servo motor 8 is mounted on the base 9, and drives the ball screw 4 to rotate through the transmission device 7. The transmission device 7 is specifically a synchronous belt speed reducer.
The relevant parameters of the test host are summarized as follows:
Further, the test bench is connected with the test host through a universal joint 18, and is composed of a swing rod 11, a support frame 12, a clamp 13, a bottom plate 14 and a rubber bushing 15. Wherein the swing rod 11 is connected to the test joint 2 of the middle cross beam 1 through a universal joint 18. The upper part of the supporting frame 12 is fixedly connected to the swing rod 11 through a pin shaft, and the bottom of the supporting frame is welded and fixed on the bottom plate 14 to provide enough strength support. The rubber bushing 15 connects the stabilizer bar 19 to the base plate 14 by bolts, and axially positions the stabilizer bar 19. The rubber of the rubber bushing 15 is used for generating little damage to the composite material pole body, ensuring the performance of the pole body, the inner layer of the bushing is connected through a round hole with slightly smaller outer diameter than the pole body, positioning and limiting the pole body, the outer layer is fixed on the bottom plate through metal clamping pieces, and the two ends of the outer layer are fixed on the bottom plate by using bolts and nuts, so that the fixation of the pole body is enhanced. The base plate 14 is fixed to the table 6 by bolts 16.
Furthermore, universal joints 18 are respectively arranged at the lower parts of the two ends of the swing rod 11, and the lower universal joints 18 are connected with a stabilizer bar 19 through a clamp or a joint. The universal joint 18 is specifically a double-joint universal joint, so that the freedom degree of the stabilizer bar in the measuring process is ensured, the stabilizer bar moves according to an actual movement track, meanwhile, the outer diameter is increased while the inner diameter is kept unchanged, the strength of the universal joint is improved, and the stabilizer bar is prevented from being damaged in the measuring process. The swing rod 11 is a hollow aluminum alloy swing rod 11, so that the strength of the rack is ensured, and the weight is reduced. The cross section of the swing rod 11 is of a concave structure, and the universal joint 18 can slide in the groove.
As shown in fig. 4, fig. 5-1 and fig. 5-2 of the specification, the clamp 13 adopts a symmetrical semi-arc structure, two sides are connected and fastened through bolts and nuts to clamp and fasten the stabilizer bar 19, and meanwhile, the performance of the composite stabilizer bar is prevented from being damaged by drilling, and the other end of the clamp is fixed with the universal joint 18 through pin connection.
As shown in fig. 6 and 7 of the specification, a first embodiment of the joint 20 is provided, where the joint 20 is connected to the stabilizer bar 19, a corresponding connection hole is provided according to the diameter of the bar, and a pin hole having a size corresponding to the universal joint 18 is provided at the other end of the joint. Before connection, plasma surface treatment is carried out on the surface of the joint 20 and the connecting part of the stabilizer bar 19, and then 3MDP460 structural adhesive is smeared. After the joint 20 is fixedly connected with the end part of the composite stabilizer bar 19, the other end of the joint 20 is fixedly connected with the universal joint 18 through a pin, so that the connection reliability of the stabilizer bar and the test bed is ensured.
As shown in fig. 8 and 9 of the specification, a second embodiment of the joint 21 is provided, in which a connecting hole of a certain length is provided at the joint 21 with the stabilizer bar 19 according to the diameter of the bar, and then a threaded hole of a size corresponding to the metal connecting piece 23 is provided at the other end. Before connection, plasma treatment is carried out on the front section connecting hole, and then 3MDP460 structural adhesive is smeared. The adhesive can expand when being solidified, so that the connecting effect is better, the breaking strain of the adhesive is larger, the adhesive can bear higher fatigue limit stress, the fatigue life is prolonged, and the connection reliability of the joint and the composite material stabilizer bar is improved. After the joint 21 is connected with the stabilizer bar 19 in a solidifying way, the joint is connected with the universal joint 18 through a pin through a metal connecting piece 23, so that the connection reliability of the stabilizer bar and the test bed is ensured.
As shown in fig. 10 and 11 of the specification, a third embodiment of the joint 22 is provided, the joint 22 adopts a U-shaped structure, the thickness of the joint 22 is greater than that of the hollow composite stabilizer bar 19, and connecting holes corresponding to the metal connecting pieces 23 are formed at two sides of the joint 22. Before connection, the surface of the joint 22 is pretreated, 3MDP460 structural adhesive is smeared at the connecting hole, and finally the joint is connected with the universal joint 18 through a metal connecting piece 23 in a pin manner, so that the connection reliability of the stabilizer bar and the test bed is ensured.
The test bench performs load analysis before testing, namely performs stress analysis in the finite element abaqus according to the condition that the stabilizer bar is loaded, calculates that the maximum stress position of the bench in working is at the position of the end clamp, and the maximum stress is smaller than the yield stress of the clamp, so that the reliability of the bench device is ensured.
Further, the control cabinet is connected with the testing host through signals, the testing host can be controlled to move, meanwhile, the control cabinet is transmitted to the sensor 3 through control signals, so that the movement working condition of the stabilizer bar is controlled, and meanwhile, the sensor 3 feeds signals back to the control cabinet. Specifically, the control cabinet outputs a signal to control the servo motor 8, the motor 8 drives the ball screw 4 to rotate, the ball screw 4 drives the middle cross beam 1 to move up and down, the linkage swing rod 11 moves up and down, then the two ends of the stabilizer bar 19 move up and down through the connected clamps 13 and 17 or connectors 21, 21 and 22, and the stabilizer bar 19 is repeatedly loaded by setting the frequency of the output signal of the controller. The sensor 3 transmits the measured displacement and force signals to the control cabinet, and the control cabinet compares the tested signals with the command signals to determine the result, so that a closed loop is formed between the test host and the controller, the control of the whole test device is realized, and the required output parameters are recorded through a computer in the control cabinet.
When the device is used for testing the rigidity of the stabilizer bar, the device comprises the following steps:
1-1), a stabilizer bar 19 is placed on the bottom plate 14, and the stabilizer bar is positioned through a rubber bushing 15;
1-2) after adjustment to the appropriate position, the stabilizer bar 19 is fixed to the test stand by means of the end clamps 13, 17 or the joints 20, 21, 22;
1-3), connecting the test bench with a test host;
1-4), starting a test host, controlling a servo motor 8 through a controller according to JB/T12794.1-2016, applying a rated load to a test joint, transmitting the rated load to a stabilizer bar 19 through a test bed, and recording displacement and load in the loading process;
1-5), calculating a stabilizer bar stiffness value through a formula K=F/S, wherein K is a stabilizer bar linear stiffness value, F is a load applied by a main machine, and S is a displacement of the end part of the stabilizer bar;
When the device is used for carrying out fatigue test on the stabilizer bar, the method comprises the following steps:
2-1) placing the stabilizer bar 19 on the bottom plate 14, positioning the stabilizer bar through the rubber bushing 15;
2-2) fixing the stabilizer bar on the rack through an end clamp or a joint after the stabilizer bar is integrated to a proper position;
2-3), connecting the test bench with a test host;
2-4), starting a test host, setting the reciprocating frequency of a test joint of the host through a controller according to JB/T12794.1-2016, and recording the number of periodic movements of a final stabilizer bar;
2-5), recording the secondary number of the final stabilizer bar periodic motion as T, namely the fatigue life of the stabilizer bar.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, but any modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (8)
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211284061.6A CN115901438B (en) | 2022-10-20 | 2022-10-20 | A method for testing the stiffness and fatigue of composite material stabilizer bars |
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| CN115901438B true CN115901438B (en) | 2025-12-12 |
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| CN119203632B (en) * | 2023-12-26 | 2025-05-02 | 湖北汽车工业学院 | Static and fatigue performance research method for transverse stabilizer bar |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140055270A (en) * | 2012-10-31 | 2014-05-09 | 대원강업주식회사 | Universal link for testing durability of stabilizer bar |
| CN114705409A (en) * | 2022-03-25 | 2022-07-05 | 西安力创材料检测技术有限公司 | Stabilizer bar fatigue test device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865812B (en) * | 2016-06-08 | 2018-01-05 | 东风汽车悬架弹簧有限公司 | A kind of test-bed and its test method for Air Suspension for Commercial Vehicles system |
| CN106482918A (en) * | 2016-11-21 | 2017-03-08 | 安徽江淮汽车集团股份有限公司 | A kind of automobile stabilizer bar stiffness measurement device |
| CN107228759B (en) * | 2017-05-31 | 2023-09-12 | 安庆市恒瑞达汽车零部件制造有限公司 | An all-in-one stabilizer bar fatigue stiffness testing machine |
| CN109115523B (en) * | 2018-10-10 | 2021-01-26 | 湖南湖大艾盛汽车技术开发有限公司 | Transverse stabilizer bar calibration test and fatigue endurance test bench and test method |
| CN212254570U (en) * | 2020-06-30 | 2020-12-29 | 中机思美迪(长春)科技有限公司 | Fatigue endurance testing machine for stabilizer bar |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20140055270A (en) * | 2012-10-31 | 2014-05-09 | 대원강업주식회사 | Universal link for testing durability of stabilizer bar |
| CN114705409A (en) * | 2022-03-25 | 2022-07-05 | 西安力创材料检测技术有限公司 | Stabilizer bar fatigue test device |
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