CN113074895A - Device and method for testing dynamic ultimate strength of stiffened plate under side load - Google Patents
Device and method for testing dynamic ultimate strength of stiffened plate under side load Download PDFInfo
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- CN113074895A CN113074895A CN202110330682.2A CN202110330682A CN113074895A CN 113074895 A CN113074895 A CN 113074895A CN 202110330682 A CN202110330682 A CN 202110330682A CN 113074895 A CN113074895 A CN 113074895A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/08—Shock-testing
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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
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
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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
- G01N2203/003—Generation of the force
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Abstract
The invention relates to a device and a method for testing the dynamic ultimate strength of a stiffened plate under a lateral load, which comprises a fixed frame, a pendulum mechanism and a lifting mechanism which are sequentially arranged from left to right; a reinforcing plate is fixedly arranged on the side surface of the fixed frame, a pendulum bob is arranged on the pendulum bob mechanism in a swinging manner, the lifting mechanism pulls the pendulum bob upwards through the electromagnetic releaser, and the pendulum bob is released to freely swing downwards and impact the reinforcing plate at the moment of power failure of the electromagnetic releaser; the testing system comprises a target mark arranged on the pendulum bob, a photoelectric switch is arranged on a foundation right below the lowest point of the pendulum bob lower pendulum, and the photoelectric switch senses the time length of the target mark; an acceleration sensor is further installed on the pendulum bob, a plurality of sensor groups are arranged on the stiffened plate, the sensor groups, the photoelectric switch, the acceleration sensor and the electromagnetic releaser are respectively and electrically connected with a data acquisition system, and the data acquisition system is connected to a test host; the dynamic ultimate strength test of the stiffened plate under the action of the lateral load is realized, and the dynamic ultimate strength test greatly assists in the research of the dynamic ultimate strength of a ship structure.
Description
Technical Field
The invention relates to the technical field of ultimate strength test devices, in particular to a device and a method for testing the dynamic ultimate strength of a stiffened plate under a side load.
Background
In order to meet the increasing demand of ocean transportation, commercial ships (such as container ships) gradually show the characteristics of large size and high speed, so that the ship head structure has obvious floating characteristics; when a ship sails in a severe sea condition, the ship body can slam violently due to the fact that the bow bottom and the stern bottom go out of and into water, and an outer floating area collides with waves, and severe ship body vibration is caused and called slamming. When high-frequency vibration bending moment caused by slamming and wave-induced low-frequency bending moment are superposed, serious threat can be formed to the total longitudinal strength of the ship body, so that the bow fluttering structure presents a typical thin horse form, and the structure is damaged when serious, thereby causing great economic loss and even threatening the life safety of personnel. According to the research results of domestic and foreign real ship tests and model tests, the slamming vibration bending moment even reaches 30-40% of the total wave bending moment of the ship body. Therefore, the ultimate strength of the stiffened plate under the dynamic slamming load needs to be studied.
In the prior art, the research on the ultimate bearing capacity of the reinforced plate structure is the research under the action of in-plane quasi-static load, and the relevant research cannot be carried out on the ultimate strength test of the structure under the action of lateral slamming load due to the factors of difficult load application mode, difficult load magnitude control, difficult load action time measurement and the like.
Disclosure of Invention
The applicant provides a reasonable-structure device and a reasonable-structure method for testing the dynamic ultimate strength of the stiffened plate under the lateral load aiming at the defects in the prior art, so that the dynamic ultimate strength test of the stiffened plate under the lateral load is realized, and the research on the ultimate strength is greatly assisted.
The technical scheme adopted by the invention is as follows:
a device for testing the dynamic ultimate strength of a stiffened plate under a lateral load comprises a fixed frame, a pendulum mechanism and a lifting mechanism which are sequentially arranged from left to right; a reinforcing plate is fixedly arranged on the side face, facing the fixing frame of the pendulum mechanism, the pendulum is arranged on the pendulum mechanism, the lifting mechanism pulls the pendulum upwards through the electromagnetic releaser, and the electromagnetic releaser releases the pendulum at the moment of power failure to enable the pendulum to freely swing downwards and impact the reinforcing plate;
still include test system, its structure is: the device comprises a target mark arranged on a pendulum bob, wherein a photoelectric switch is arranged right below the lowest point of the lower pendulum of the pendulum bob, and the time length of the target mark passing through is sensed through the photoelectric switch; the pendulum bob is further provided with an acceleration sensor, a plurality of groups of sensor groups are arranged on the stiffened plate, the sensor groups, the photoelectric switch, the acceleration sensor and the electromagnetic releaser are respectively electrically connected with a data acquisition system, and the data acquisition system is connected to a test host.
As a further improvement of the above technical solution:
the lifting mechanism adjusts the height of the pendulum bob upwards pulled by the electromagnetic releaser;
the lifting mechanism has the structure that: the device comprises support frames which are arranged at intervals in the front and back, a rotating shaft is arranged above the two support frames in a rotating mode, a motor is arranged on the outer side face of one support frame, the output end of the motor faces upwards, a gear set which is meshed with the motor is arranged at the end of the motor, and a driven gear in the gear set is fixedly sleeved at the end of the rotating shaft; a steel wire rope is wound on the rotating shaft, and an electromagnetic releaser is fixedly arranged at the end of the steel wire rope; the motor is controlled by a control switch arranged below the outer side surface of the support frame.
The top end of each support frame is provided with a top plate, the top plates and the support frames are connected with a rotating shaft through bearings in a rotating mode, and the top plates are fixedly locked on the top ends of the support frames.
The pendulum mechanism has the structure that: the pendulum comprises upright posts arranged at intervals in the front and at the back, a pendulum shaft is installed at the tops of the two upright posts in a rotating mode, a pendulum arm is installed in the middle of the pendulum shaft in a rotating mode, and a pendulum bob is fixedly installed at the end of the pendulum arm.
Reinforcing plates are fixedly arranged on the front side and the rear side of each single upright post, top covers are assembled at the top ends of the single upright posts, the top covers and the upright posts are rotatably connected with a swing shaft through bearings, and the top covers are fixedly locked at the top ends of the upright posts; and a bearing is arranged between the swing shaft and the swing arm.
The structure of the fixing frame is as follows: including fore-and-aft spaced stiffener, the side of single stiffener towards pendulum mechanism all installs upright panel, and two upright panel sides are equipped with the gusset through the fastener lock jointly.
The hammer head of the pendulum hammer faces the stiffened plate, the tail of the pendulum hammer is fixedly provided with a hanging ring, and the electromagnetic releaser is hung with the hanging ring to realize the connection with the pendulum hammer.
The reinforcing rib of the reinforcing plate is positioned on the side surface back to the pendulum bob; the isolation protective net is used for accommodating the fixed frame, the pendulum mechanism and the lifting mechanism; the sensor groups are orderly arranged on the stiffened plate in an array, and the single sensor group comprises a strain sensor, a displacement sensor and an acceleration sensor.
A test method of the device for testing the dynamic ultimate strength of the stiffened plate under the side load comprises the following steps:
mounting the stiffened plate on a fixed frame, and rigidly fixing the boundary of the stiffened plate through bolt locking;
arranging sensor groups on the side surface of the reinforced plate in a matrix form;
determining the height of the pendulum bob according to the set load size, and lifting the pendulum bob to the height through an electromagnetic releaser by a lifting mechanism to be used as the initial position of the lower pendulum;
arranging a laser range finder under the initial position of the pendulum bob to obtain the actual height of the initial position;
setting sampling frequencies of a sensor group and an acceleration sensor, and starting a data acquisition system; then controlling the electromagnetic releaser to lose power through the test host, and enabling the pendulum bob to freely swing downwards to impact the stiffened plate;
in the pendulum bob down-swinging process, feeding back the target mark elapsed time length by a photoelectric switch to obtain the actual speed of the pendulum bob;
the acceleration sensor feeds back the acceleration in the swinging process of the pendulum bob in real time, the sensor group feeds back the state parameters of the stiffened plate in the impacting process in real time, and an external high-speed camera shoots the process that the pendulum bob swings downwards to impact the stiffened plate;
and according to the test requirement, repeating the test under the same-value load or variable-value load until the test is finished.
As a further improvement of the above technical solution:
the length of the target mark is set to be 1cm, namely, the time of the target mark swinging on the length of 1cm is detected through the photoelectric switch.
The invention has the following beneficial effects:
the invention has compact and reasonable structure and convenient operation, releases the pendulum bob at different heights through the lifting mechanism to determine the size of the applied load, finishes lifting and releasing the pendulum bob through the electromagnetic releaser, finishes fixing the boundary of the reinforced plate to be tested through the fixed frame, obtains the acceleration change condition in the whole process through the acceleration sensor on the pendulum bob, further can obtain the speed change condition in the whole process of the pendulum bob through an integral mode, is suitable for dynamic ultimate strength tests of reinforced plate structures with different load magnitudes and different scales, and greatly assists in the ultimate strength research of the reinforced plate, in particular the dynamic ultimate strength research under the action of lateral load.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
FIG. 2 is a schematic structural diagram of a test system according to the present invention.
Fig. 3 is a schematic structural diagram of the lifting mechanism of the present invention.
Fig. 4 is a schematic structural diagram of the pendulum mechanism of the present invention.
Fig. 5 is a side view of fig. 4.
Fig. 6 is a schematic structural view of the fixing frame of the present invention.
Fig. 7 is a top view of fig. 6.
Wherein: 1. a fixed mount; 2. a pendulum mechanism; 3. a foundation; 4. a lifting mechanism; 5. an isolation protective net; 6. a data acquisition system; 7. a test host; 8. a camera;
10. adding a rib plate; 11. a vertical panel; 12. a reinforcing frame; 101. reinforcing ribs;
20. a pendulum bob; 21. a reinforcing plate; 22. a column; 23. a pendulum shaft; 24. a top cover; 25. swinging arms; 26. a hoisting ring;
40. an electromagnetic releaser; 41. a support frame; 42. a wire rope; 43. a rotating shaft; 44. a top plate; 45. a gear set; 46. a motor; 47. a control switch;
91. a sensor group; 92. a photoelectric switch; 93. a target mark; 94. an acceleration sensor; 95. laser range finder.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1, the device for testing the dynamic ultimate strength of a stiffened plate under a side load in the embodiment comprises a foundation 3, wherein a fixed frame 1, a pendulum mechanism 2 and a lifting mechanism 4 are sequentially arranged on the foundation 3 from left to right; a reinforcing plate 10 is fixedly arranged on the side face, facing the fixed frame 1 of the pendulum mechanism 2, a pendulum 20 is arranged on the pendulum mechanism 2 in a swinging mode, the lifting mechanism 4 pulls the pendulum 20 upwards through an electromagnetic releaser 40, and the pendulum 20 is released at the moment when the electromagnetic releaser 40 is de-energized to freely swing downwards and impact the reinforcing plate 10;
as shown in fig. 2, the testing system is further included, and the structure thereof is as follows: the device comprises a target mark 93 arranged on a pendulum bob 20, a photoelectric switch 92 is arranged on a foundation 3 positioned right below the lowest point of the lower pendulum of the pendulum bob 20, and the time length of the target mark 93 passing is sensed through the photoelectric switch 92; the pendulum bob 20 is further provided with an acceleration sensor 94, the stiffened plate 10 is provided with a plurality of sensor groups 91, the photoelectric switch 92, the acceleration sensor 94 and the electromagnetic releaser 40 are respectively electrically connected with the data acquisition system 6, and the data acquisition system 6 is connected to the test host 7.
The pendulum bob 20 is released at different heights through the lifting mechanism 4 to determine the size of the applied load, the electromagnetic releaser 40 finishes lifting and releasing of the pendulum bob 20, the fixing of the boundary of the stiffened plate 10 to be tested is finished through the fixing frame 1, the acceleration change condition of the pendulum bob 20 in the whole process is obtained through the acceleration sensor 94 on the pendulum bob 20, the speed change condition of the pendulum bob 20 in the whole process can be further obtained through an integral mode, and the device is suitable for dynamic ultimate strength tests of stiffened plate 10 structures with different scales and different load magnitudes.
The lifting mechanism 4 adjusts the height of the pendulum bob 20 pulled upwards by the electromagnetic releaser 40;
as shown in fig. 3, the lifting mechanism 4 has the structure: the device comprises support frames 41 which are arranged at intervals in the front and back, a rotating shaft 43 is arranged above the two support frames 41 in a rotating mode, a motor 46 is arranged on the outer side face of one support frame 41, the output end of the motor 46 faces upwards, a gear set 45 which is meshed with each other is arranged at the end of the motor 46, and a driven gear in the gear set 45 is fixedly sleeved at the end of the rotating shaft 43; a steel wire rope 42 is wound on the rotating shaft 43, and an electromagnetic releaser 40 is fixedly arranged at the end of the steel wire rope 42; the motor 46 is controlled by a control switch 47 arranged below the outer side of the support frame 41.
The top ends of the single support frames 41 are respectively provided with a top plate 44, the top plate 44 and the support frames 41 are connected with a rotating shaft 43 through a bearing in a rotating mode, and the top plates 44 are fixedly locked at the top ends of the support frames 41.
The motor 46 works to drive the driving gear in the gear set 45 to rotate, the driving gear drives the driven gear meshed with the driving gear to rotate, the rotating shaft 43 rotates along with the driven gear, and then the wire rope 42 on the rotating shaft 43 is wound or unwound, so that the initial height of the pendulum bob 20 is lifted or lowered through the electromagnetic releaser 40 at the end of the wire rope 42.
As shown in fig. 4 and 5, the pendulum mechanism 2 has the following structure: the pendulum comprises upright posts 22 arranged at intervals in the front and back, a pendulum shaft 23 is installed at the tops of the two upright posts 22 in a rotating mode, a pendulum arm 25 is installed in the middle of the pendulum shaft 23 in a rotating mode, and the end of the pendulum arm 25 is fixedly installed on a pendulum bob 20.
The front side and the rear side of each single upright post 22 are fixedly provided with a reinforcing plate 21, the top end of each single upright post 22 is provided with a top cover 24, the top covers 24 and the upright posts 22 are rotatably connected with a swing shaft 23 through bearings, and the top covers 24 are fixedly locked at the top ends of the upright posts 22; a bearing is arranged between the swing shaft 23 and the swing arm 25.
The assembly of the support frame 41 and the top plate 44 and the assembly of the upright column 22 and the top cover 24 are convenient for replacement, installation and maintenance of the rotating shaft 43 or the pendulum shaft 23, so that the pendulum bob support is suitable for use of pendulum bobs 20 with different models and sizes and is suitable for smooth and reliable test under different test requirements; the top of the top plate 44 and the top cover 24 can be provided with a buckle which is convenient for carrying and transferring.
As shown in fig. 6 and 7, the structure of the fixing frame 1 is: the pendulum mechanism comprises reinforcing frames 12 fixedly arranged on a foundation 3 at intervals in the front and back, vertical panels 11 are arranged on the side faces, facing the pendulum mechanism 2, of the single reinforcing frame 12, and reinforcing plates 10 are arranged on the side faces of the two vertical panels 11 through fastener locks.
A plurality of bolt holes arranged in a matrix are formed in the vertical panel 11, and the stiffened plate 10 is fastened and connected with certain bolt holes in the vertical panel 11 through fasteners according to different test requirements, so that the rigid fixation of the boundary of the stiffened plate 10 is realized.
The hammer head of the pendulum bob 20 faces the stiffened plate 10, the tail of the pendulum bob 20 is fixedly provided with a hanging ring 26, and the electromagnetic releaser 40 is hung on the hanging ring 26 to realize the connection with the pendulum bob 20.
The reinforcing rib 101 of the reinforcing plate 10 is positioned on the side back to the pendulum bob 20; the device also comprises an isolation protective net 5 which contains the fixed frame 1, the pendulum mechanism 2 and the lifting mechanism 4; the sensor group 91 is orderly arranged on the stiffened plate 10 in an array, and the single sensor group 91 comprises a strain sensor, a displacement sensor and an acceleration sensor.
In this embodiment, the foundation 3 is a steel foundation, and the fixing frame 1, the pendulum mechanism 2 and the lifting mechanism 4 are respectively and rigidly connected with the foundation 3.
The test method of the device for testing the dynamic ultimate strength of the stiffened plate under the lateral load comprises the following steps:
installing a stiffened plate 10 on the fixed frame 1, and rigidly fixing the boundary of the stiffened plate 10 through bolt locking;
arranging a sensor group 91 on the side surface of the stiffened plate 10 in a matrix form;
determining the height of the pendulum bob 20 according to the set load size, and lifting the pendulum bob 20 to the height through the electromagnetic releaser 40 by the lifting mechanism 4 as the initial position of the lower pendulum;
arranging a laser range finder 95 on the foundation 3 right below the initial position of the pendulum bob 20 to obtain the actual height of the initial position;
setting sampling frequencies of the sensor group 91 and the acceleration sensor 94, and starting the data acquisition system 6; then, the electromagnetic releaser 40 is controlled to lose power through the test host 7, and the pendulum bob 20 freely swings downwards to impact the stiffened plate 10;
in the process of swinging down the pendulum bob 20, feeding back the elapsed time of the target mark 93 by the photoelectric switch 92 to obtain the actual speed of the pendulum bob 20;
the acceleration sensor 94 feeds back the acceleration in the swinging process of the pendulum bob 20 in real time, the sensor group 91 feeds back the state parameters in the impacting process of the stiffened plate 10 in real time, and the process that the pendulum bob 20 swings down to impact the stiffened plate 10 is shot through the external high-speed camera 8;
and according to the test requirement, repeating the test under the same-value load or variable-value load until the test is finished.
The length of the target mark 93 is set to 1cm, that is, the length of the target mark 93 in the horizontal direction when the bob 20 swings down to the lowest point is 1cm, that is, the time for which the target mark 93 swings over a length of 1cm is detected via the photoelectric switch 92.
When the test is initial, the parameters of the sensor group 91, the photoelectric switch 92, the acceleration sensor 94 and the laser range finder 95 which are connected with the data acquisition system 6 are reset and initialized through the test host 7; after the equipment connection is ready, closing the isolation protection net 5; setting the sampling frequency of each sensor to be 5000Hz, starting a test after the collected data fed back from the data acquisition system 6 are stable, namely, when the electromagnetic releaser 40 loses power, the pendulum bob 20 starts to freely swing downwards; and when the pendulum bob 20 is impacted, namely stops, adjusting the load or other test working conditions according to the test requirements, and performing repeated tests.
In this embodiment, the load is set according to the test requirement to obtain the theoretical pendulum bob 20 initial position height h, using free fall formula
(wherein g is the acceleration of gravity) to obtain a theoretical impact time velocity;
when the pendulum bob 20 swings to the lowest point and the target mark 93 passes through the photoelectric switch 92, the time length t of the passing of the target mark 93 is fed back by the photoelectric switch 92, and the length of the target mark 93 is preset to be 1 cm; since the length of the target mark 93 is small, the pendulum 20 moves fast, the time taken is short, and the lowest point is reached already when passing through the photoelectric switch 92, therefore, neglecting the acceleration effect, the pendulum 20 is equivalent to a uniform motion, and the value of the actual impact speed v1 of the pendulum 20 can be obtained according to v1 as s/t (where s is the length of the target mark 93).
The device for testing the dynamic ultimate strength of the stiffened plate under the lateral load realizes the dynamic ultimate strength test of the stiffened plate under the lateral load, can accurately obtain a series of parameters such as load application size, load action time period, speed change in the load action process, structural deformation, stress, strain change and the like of the stiffened plate, greatly assists in the ultimate strength research of the stiffened plate, and has the advantages of convenient use, good repeatability and high reliability.
The above description is intended to be illustrative and not restrictive, and the scope of the invention is defined by the appended claims, which may be modified in any manner within the scope of the invention.
Claims (10)
1. The utility model provides a stiffened plate developments ultimate strength test device under side load which characterized in that: comprises a fixed frame (1), a pendulum mechanism (2) and a lifting mechanism (4) which are arranged from left to right in sequence; a reinforcing plate (10) is fixedly arranged on the side face of the fixed frame (1) facing the pendulum mechanism (2), a pendulum (20) is arranged on the pendulum mechanism (2), the lifting mechanism (4) pulls the pendulum (20) upwards through an electromagnetic releaser (40), and the pendulum (20) is released to freely swing downwards and impact the reinforcing plate (10) at the moment of power failure of the electromagnetic releaser (40); still include test system, its structure is: the device comprises a target mark (93) arranged on a pendulum bob (20), wherein a photoelectric switch (92) is arranged right below the lowest point of the lower pendulum of the pendulum bob (20), and the time length of the target mark (93) passing is sensed through the photoelectric switch (92); still install acceleration sensor (94) on pendulum (20), set up multiunit sensor group (91) on gusset (10), sensor group (91), photoelectric switch (92), acceleration sensor (94) and electromagnetic release (40) respectively with data acquisition system (6) electric connection, data acquisition system (6) are connected to test host computer (7).
2. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1, wherein: the lifting mechanism (4) adjusts the height of the pendulum bob (20) pulled upwards by the electromagnetic releaser (40);
the lifting mechanism (4) is structurally characterized in that: the device comprises supporting frames (41) which are arranged at intervals in the front and back, a rotating shaft (43) is installed above the two supporting frames (41) in a rotating mode, a motor (46) is installed on the outer side face of one supporting frame (41), the output end of the motor (46) faces upwards, a gear set (45) which is meshed with each other is installed at the end of the motor (46), and a driven gear in the gear set (45) is fixedly sleeved at the end of the rotating shaft (43); a steel wire rope (42) is wound on the rotating shaft (43), and an electromagnetic releaser (40) is fixedly arranged at the end of the steel wire rope (42); the motor (46) is controlled by a control switch (47) arranged below the outer side surface of the support frame (41).
3. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 2, wherein: the top end of each support frame (41) is provided with a top plate (44), the top plates (44) and the support frames (41) are connected with a rotating shaft (43) through bearings in a rotating mode, and the top plates (44) are fixedly locked at the top ends of the support frames (41).
4. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1, wherein: the pendulum mechanism (2) has the structure that: the pendulum comprises upright posts (22) arranged at intervals in the front and back, pendulum shafts (23) are installed at the tops of the two upright posts (22) in a rotating mode, a swing arm (25) is installed in the middle of each pendulum shaft (23) in a rotating mode, and the end of each swing arm (25) is fixedly provided with a pendulum bob (20).
5. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 4, wherein: reinforcing plates (21) are fixedly arranged on the front side and the rear side of each single upright post (22), top covers (24) are assembled at the top ends of the single upright posts (22), the top covers (24) and the upright posts (22) are rotatably connected with a swing shaft (23) through bearings, and the top covers (24) are fixedly locked at the top ends of the upright posts (22); and a bearing is arranged between the swing shaft (23) and the swing arm (25).
6. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1, wherein: the structure of the fixing frame (1) is as follows: the pendulum mechanism comprises reinforcing frames (12) which are spaced from each other at the front and the back, vertical panels (11) are installed on the side faces, facing the pendulum mechanism (2), of the single reinforcing frame (12), and reinforcing plates (10) are installed on the side faces of the two vertical panels (11) through fasteners in a locking mode.
7. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1, wherein: the hammer head of the pendulum bob (20) faces the stiffened plate (10), the tail of the pendulum bob (20) is fixedly provided with a hanging ring (26), and the electromagnetic releaser (40) is hung with the hanging ring (26) to realize the connection with the pendulum bob (20).
8. The device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1, wherein: the reinforcing rib (101) of the reinforcing rib plate (10) is positioned on the side surface back to the pendulum bob (20); the device also comprises an isolation protective net (5) which contains the fixed frame (1), the pendulum mechanism (2) and the lifting mechanism (4); the sensor groups (91) are orderly arranged on the stiffened plate (10) in an array, and the single sensor group (91) comprises a strain sensor, a displacement sensor and an acceleration sensor.
9. A test method of the device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 1 is characterized in that: the method comprises the following steps:
the stiffened plate (10) is arranged on the fixed frame (1), and the boundary of the stiffened plate (10) is rigidly fixed through bolt locking;
arranging a sensor group (91) on the side surface of the stiffened plate (10) in a matrix form;
determining the height of the pendulum bob (20) according to the set load size, and lifting the pendulum bob (20) to the height through an electromagnetic releaser (40) by a lifting mechanism (4) to be used as the initial position of the lower pendulum;
arranging a laser range finder (95) right below the initial position of the pendulum bob (20) to obtain the actual height of the initial position;
setting sampling frequencies of a sensor group (91) and an acceleration sensor (94), and starting a data acquisition system (6); then, the electromagnetic releaser (40) is controlled to lose power through the test host (7), and the pendulum bob (20) freely swings downwards to impact the stiffened plate (10);
in the process that the pendulum bob (20) swings downwards, a photoelectric switch (92) feeds back a target mark (93) to pass through time length to obtain the actual speed of the pendulum bob (20);
an acceleration sensor (94) feeds back acceleration in the swinging process of the pendulum bob (20) in real time, a sensor group (91) feeds back state parameters in the impacting process of the stiffened plate (10) in real time, and an external high-speed camera (8) is used for shooting the process that the pendulum bob (20) swings down to impact the stiffened plate (10);
and according to the test requirement, repeating the test under the same-value load or variable-value load until the test is finished.
10. The test method of the device for testing the dynamic ultimate strength of the stiffened plate under the side load according to claim 9, wherein: the length of the target mark (93) is set to be 1cm, namely, the time for the target mark (93) to swing over the length of 1cm is detected through the photoelectric switch (92).
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| CN202110330682.2A CN113074895A (en) | 2021-03-26 | 2021-03-26 | Device and method for testing dynamic ultimate strength of stiffened plate under side load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354396A (en) * | 2021-12-29 | 2022-04-15 | 上海交通大学 | Dynamic buckling and ultimate strength testing device for large stiffened plate of ship body under impact load |
| CN114993716A (en) * | 2022-05-24 | 2022-09-02 | 中南大学 | Train collision test system and method for testing animal collision |
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