CN110455620B - Small-size combined material decides strain fatigue test device - Google Patents
Small-size combined material decides strain fatigue test device Download PDFInfo
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- CN110455620B CN110455620B CN201910701644.6A CN201910701644A CN110455620B CN 110455620 B CN110455620 B CN 110455620B CN 201910701644 A CN201910701644 A CN 201910701644A CN 110455620 B CN110455620 B CN 110455620B
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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
- G01N3/04—Chucks
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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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
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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
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a small-sized composite material constant strain fatigue test device which comprises at least one internal test piece clamp and an external circulating platform, wherein the external circulating platform comprises a base, a driving motor, a gear shaft, two cams, two driven parts, two rigid shaft sleeves and a fixing platform, each internal test piece clamp comprises an upper end pre-tightening nut, an upper clamp cover, two groups of clamping devices, a lower clamp cover and two side end pre-tightening nuts, the test piece clamps can tighten test pieces with different widths through front and rear clamp arms, and the test pieces with different lengths can be tightened through the upper clamp cover and the lower clamp cover. The device can be used for profiling and clamping the dumbbell-shaped test piece, namely the length and the width of the clamp are all variable, the centering requirement of the test piece is ensured, and the device can be placed into an aging oven to perform a multi-factor superposed dynamic fatigue test on the test piece. The invention is suitable for aging-containing dynamic constant strain fatigue tests of composite materials, high polymer materials and various non-metal materials, and has wider application range.
Description
Technical Field
The invention belongs to the technical field of fatigue damage tests, and particularly relates to a fixed strain fatigue test device for a small composite material.
Background
At present, single-factor aging research on viscoelastic composite materials (such as hydroxyl-terminated polybutadiene HTPB) is mature, and multi-factor superimposed aging research on the viscoelastic composite materials is not complete, such as research on dynamic fatigue mechanical damage characteristics of the materials under humid heat aging. The main problems in the above studies are: the traditional dynamic fatigue testing machine is too large in size, so that the wet-heat aging working condition of the material cannot be superposed when the material is subjected to a fixed strain fatigue test. Meanwhile, due to the fact that certain errors exist in the preparation process of the traditional dumbbell-shaped test piece, the test piece is caused to have different sizes, most typically, the test piece is different in length, the test piece cannot be centered on the traditional clamp, and therefore the accuracy of an experimental result is influenced to a certain extent.
Disclosure of Invention
The invention aims to provide a small composite material constant strain fatigue test device to solve the problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a small-sized composite material constant strain fatigue test device comprises an external circulation platform and at least one internal test piece clamp, wherein the external circulation platform comprises a base, a driving motor, a gear shaft, two cams, two driven parts, two rigid shaft sleeves and a fixed platform, the gear shaft penetrates through the base, a first gear is arranged in the middle of the gear shaft, the two cams are fixedly connected to two ends of the gear shaft penetrating out of the base respectively, the driving motor is fixedly supported on the base, an output shaft of the driving motor is connected with a second gear, the second gear is meshed with the first gear, the bottom of the driven part is a large-diameter cylindrical section, the upper portion of the large-diameter cylindrical section is a small-diameter shaft section, the top of the small-diameter shaft section penetrates through a first through hole of the fixed platform, the rigid shaft sleeve is sleeved outside the small-diameter shaft section, and the bottom of the rigid shaft sleeve abuts against the top surface of the large-diameter cylindrical section, The top of the inner test piece clamp is abutted against the bottom surface of the fixed table, the bottom surface of the large-diameter cylindrical section is abutted against the cam surface of the corresponding cam, each inner test piece clamp comprises an upper end pre-tightening nut, a clamp upper cover, two groups of clamping devices, a clamp lower cover and two side end pre-tightening nuts, each group of clamping devices comprises a front clamping arm and a rear clamping arm, the side surface of each rear clamping arm is provided with a protruding stud, a front clamping arm through hole is formed in the position, corresponding to the protruding stud, of each front clamping arm, the protruding stud can penetrate through the front clamping arm through hole and clamp the test piece through the side end pre-tightening nuts, the two groups of clamping devices respectively clamp the upper end and the lower end of the test piece, the clamp upper cover and the first group of clamping devices can be nested through a sliding groove, the clamp lower cover and the second group of clamping devices can be nested through the sliding groove, and the upper end of the clamp upper cover is provided with a fixing stud, the lower end face of the lower clamp cover is fixedly connected with the upper end face of the base, and the fixing stud of the upper clamp cover penetrates through the second through hole of the fixing table and is connected with the internal test piece clamp and the external circulating platform through the upper end pre-tightening nut.
Furthermore, the lower end face of the lower clamp cover is connected with the upper end face of the base in a welding mode.
Further, the inner diameter of the rigid shaft sleeve is larger than the aperture of the first through hole of the fixed table.
Further, the second through hole of the fixing table is arranged between the two first through holes.
Further, the number of the internal test piece clamps is 3-8.
Further, the composite material is a viscoelastic composite material.
Further, the viscoelastic composite material is hydroxyl-terminated polybutadiene.
Compared with the prior art, the invention has the advantages that:
(1) the internal test piece clamp realizes profiling clamping on two ends of a dumbbell-shaped test piece through the connection of the front clamp arm and the rear clamp arm, and can clamp test pieces with different widths, the upper end of the upper cover of the clamp is provided with a fixing stud which passes through the second through hole of the fixing table and realizes the connection of the internal test piece clamp and an external circulating platform through the upper end pre-tightening nut, so that the clamping can be realized only by adjusting the upper end pre-tightening nut for the test pieces with different lengths, and the test error caused by different sizes of the test pieces is greatly reduced;
(2) the aging oven is simple and reasonable in structure and small in size, and can be placed in the aging oven, so that the aging research of multi-factor superposition can be realized.
Drawings
FIG. 1 is a schematic view of the overall structure of the small composite material constant strain fatigue testing device of the present invention.
Figure 2 is an exploded view of the internal specimen holder.
Detailed Description
The following describes the implementation of the present invention in detail with reference to specific embodiments.
As shown in fig. 1-2, a small composite material constant strain fatigue test device comprises an external circulation platform and at least one internal test piece clamp, wherein the external circulation platform comprises a base 8, a driving motor 9, a gear shaft 10, two cams 11, two driven members 12, two rigid shaft sleeves 13 and a fixed platform 15, the gear shaft 10 passes through the base 8, a first gear 16 is arranged in the middle of the gear shaft 10, two cams 11 are respectively and fixedly connected to two ends of the gear shaft 10 penetrating through the base 8, the driving motor 9 is fixedly supported on the base 8, an output shaft of the driving motor 9 is connected with a second gear 17, the second gear 17 is meshed with the first gear 16, the driving motor 9 is a stepping motor or a speed regulating motor, and the tensile speed and the frequency of the device to a test piece are regulated by regulating the rotating speed of the motor, the motor drives the cam 11 to rotate through the gear shaft 10, the size of the cam is determined by the fixed strain length required by the test and the original length of the dumbbell piece, the bottom of the driven piece 12 is a large-diameter cylindrical section, the upper part of the large-diameter cylindrical section is a small-diameter shaft section, the top of the small-diameter shaft section penetrates through a first through hole of the fixed table 15, the outer part of the small-diameter shaft section is sleeved with the rigid shaft sleeve 13, the bottom of the rigid shaft sleeve 13 abuts against the top surface of the large-diameter cylindrical section, the top of the rigid shaft sleeve 13 abuts against the bottom surface of the fixed table 15, the bottom of the large-diameter cylindrical section abuts against the corresponding cam surface of the cam 11, when the cam 11 rotates, the driven piece 12 is pushed to move up and down, then the rigid shaft sleeve 13 arranged outside the driven piece 12 is stressed to push the fixed table 15 to move, and each internal test piece clamp comprises an upper end pre-tightening nut 1, a clamp upper cover 2, two groups of clamping devices and a clamp lower cover 6, Two side end pre-tightening nuts 7, each group of clamping devices comprises a front clamping arm 4 and a rear clamping arm 5, the side surface of each rear clamping arm 5 is provided with a protruding stud, the position of each front clamping arm 4 corresponding to the protruding stud is provided with a front clamping arm through hole, the extended stud can penetrate through the through hole of the front clamping arm and clamp the test piece 14 through the side end pre-tightening nut 7, the two groups of clamping devices respectively clamp the upper end and the lower end of the test piece 14, the upper clamp cover 2 and the first group of clamping devices can be nested through the sliding chute, the lower clamp cover 6 and the second group of clamping devices can be nested through the sliding chute, the upper end of the upper clamp cover 2 is provided with a fixing stud, the lower end surface of the lower clamp cover 6 is fixedly connected with the upper end surface of the base 8, and a fixing stud of the clamp upper cover 2 penetrates through a second through hole of the fixing table 15 and is connected with the external circulation platform through an upper end pre-tightening nut 1.
Further, the lower end face of the clamp lower cover 6 is connected with the upper end face of the base 8 in a welding mode.
Further, the inner diameter of the rigid bushing 13 is larger than the diameter of the first through hole of the fixed table 15.
Further, the second through hole of the fixing table 15 is disposed between the two first through holes.
Further, the number of the internal test piece clamps is 3-8.
Further, the composite material is a viscoelastic composite material, preferably the viscoelastic composite material is hydroxyl-terminated polybutadiene.
Before starting the test, a test piece needs to be loaded into the fixture, as shown in fig. 2, the upper end and the lower end of the test piece are firstly placed into the rear clamping arm 5, a reserved hole (through hole) in the front clamping arm 4 penetrates through a protruding stud on the rear clamping arm 5, then a side end pre-tightening nut 7 is installed on the protruding stud which penetrates through the front clamping arm, and the displacement of the front clamping arm 4 can be finely adjusted through pre-tightening of the side end pre-tightening nut 7, so that the profiling function of the fixture on the width of the test piece is realized. Because anchor clamps lower cover 6 is the rigid coupling on the platform of base 8 top, so as like figure 1, can pack into the upper and lower lid of anchor clamps through the spout of arm lock both sides with the test piece of installing preceding, back arm lock at first, the installation order is: the rear clamping arm 5 firstly enters the clamping cover, firstly enters the lower clamp cover 6 and then enters the upper clamp cover 2. After all the test pieces are mounted, the rigid shaft sleeve 13 can be mounted on the driven member 12, and then the shaft end of the upper part of the driven member 12 is mounted in the first through hole of the fixed table 15 through clearance fit. The threaded column of each clamp upper cover 2 needs to pass through a second through hole in the fixed station 15 when the fixed station 15 is installed, and finally the upper end pre-tightening nut 1 can be installed, and the displacement of the clamp upper covers 2 can be finely adjusted through pre-tightening the upper end pre-tightening nut 1, so that the copying function of the clamp on the length of a test piece is realized.
As shown in fig. 1, it can be seen that the standard test piece 14 is different from the shorter test piece 3 in installation, and the clamp can adapt to test pieces with different lengths by changing the pre-tightening displacement of the pre-tightening nut 1 at the upper end, so that the error caused by the centering problem in the test is reduced. In a similar way, the purpose of tightening the test piece can be achieved by adjusting the side pre-tightening nut 7 on the change of the width of the test piece.
After the test piece is installed, the motor 9 can be started, the driven piece 12, the rigid shaft sleeve 13 and the fixing table 15 can be driven to do up-and-down reciprocating motion along with the rotation of the cam 11, so that the test piece 14 is subjected to periodic constant strain stretching, the effect of fatigue stretching of the test piece is achieved, and meanwhile, the device can be placed into an aging oven to achieve the effect of fatigue stretching of the test piece through superposition of damp-heat aging. After the test is carried out for the preset time, the motor can be stopped, the test piece is taken down, the test piece is placed into other mechanical testing instruments, and the mechanical analysis and evaluation after the test piece is fatigued are carried out.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The small-sized composite material constant strain fatigue test device is characterized by comprising an external circulation platform and at least one internal test piece clamp, wherein the external circulation platform comprises a base (8), a driving motor (9), a gear shaft (10), two cams (11), two driven parts (12), two rigid shaft sleeves (13) and a fixed table (15), the gear shaft (10) penetrates through the base (8), a first gear (16) is arranged in the middle of the gear shaft (10), the two ends of the gear shaft (10) penetrating through the base (8) are respectively and fixedly connected with one cam (11), the driving motor (9) is fixedly supported on the base (8), an output shaft of the driving motor (9) is connected with a second gear (17), the second gear (17) is meshed with the first gear (16), the bottom of the driven part (12) is a large-diameter cylindrical section, the upper part of the large-diameter cylindrical section is a small-diameter shaft section, the top of the small-diameter shaft section penetrates through a first through hole of a fixing table (15), the outside of the small-diameter shaft section is sleeved with the rigid shaft sleeve (13), the bottom of the rigid shaft sleeve (13) abuts against the top surface of the large-diameter cylindrical section, the top of the rigid shaft sleeve (13) abuts against the bottom surface of the fixing table (15), the bottom surface of the large-diameter cylindrical section abuts against the cam surface of a corresponding cam (11), each internal test piece clamp comprises an upper end pretightening nut (1), a clamp upper cover (2), two groups of clamping devices, a clamp lower cover (6) and two side end pretightening nuts (7), each group of the clamping devices comprises a front clamping arm (4) and a rear clamping arm (5), the side surface of each rear clamping arm (5) is provided with an extending stud, and a front clamping arm through hole is formed in the position, corresponding to the extending stud, of each front clamping arm (4), the extending stud can penetrate through the through hole of the front clamping arm and clamp a test piece (14) through a side pre-tightening nut (7), two groups of clamping devices respectively clamp the upper end and the lower end of the test piece (14), the upper clamp cover (2) and the first group of clamping devices can be nested through a sliding groove, the lower clamp cover (6) and the second group of clamping devices can be nested through a sliding groove, a fixing stud is arranged at the upper end of the upper clamp cover (2), the lower end face of the lower clamp cover (6) is fixedly connected with the upper end face of the base (8), and the fixing stud of the upper clamp cover (2) penetrates through the second through hole of the fixing table (15) and is connected with an external circulation platform through the upper pre-tightening nut (1).
2. The small composite material constant strain fatigue test device according to claim 1, wherein the lower end surface of the clamp lower cover (6) is welded and connected with the upper end surface of the base (8).
3. The small composite material constant strain fatigue test device according to claim 1, wherein the inner diameter of the rigid bushing (13) is larger than the diameter of the first through hole of the fixed table (15).
4. The small composite material strain-fixed fatigue test device according to claim 1, wherein the second through hole of the fixing table (15) is disposed between two first through holes.
5. The small composite material constant strain fatigue test device according to claim 1, wherein the number of the internal test piece clamps is 3-8.
6. A mini composite static strain fatigue test apparatus as set forth in any one of claims 1-5 wherein the composite is a viscoelastic composite.
7. The small composite material strain-set fatigue test device of claim 6, wherein the viscoelastic composite material is hydroxyl-terminated polybutadiene.
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| CN201910701644.6A CN110455620B (en) | 2019-07-31 | 2019-07-31 | Small-size combined material decides strain fatigue test device |
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| CN201910701644.6A CN110455620B (en) | 2019-07-31 | 2019-07-31 | Small-size combined material decides strain fatigue test device |
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| CN110455620B true CN110455620B (en) | 2022-03-04 |
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| CN114544401B (en) * | 2022-04-25 | 2022-08-09 | 浙江金仪盛世生物工程有限公司 | Testing device |
| CN116429573B (en) * | 2023-04-17 | 2023-12-08 | 北京工业大学 | Welding type IGBT module bonding wire tensile testing device and method |
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