CN214472258U

CN214472258U - Controllable monofilament fiber transverse impact device

Info

Publication number: CN214472258U
Application number: CN202120038881.1U
Authority: CN
Inventors: 徐松林; 常晋源; 王鹏飞; 苗春贺
Original assignee: University of Science and Technology of China USTC
Current assignee: University of Science and Technology of China USTC
Priority date: 2021-01-08
Filing date: 2021-01-08
Publication date: 2021-10-22
Anticipated expiration: 2031-01-08

Abstract

The utility model discloses a controllable monofilament fiber transverse impact device, which comprises a bullet, a dynamic force sensor, two beams of infrared laser emission sources, a high-strength magnet, a smooth support, a test sample, a laser receiving probe, a bullet attitude control tube, a bullet tail end controller, a linear fixer and a strong spring; the device comprises a bullet acceleration part, a bullet speed testing part and a fiber transient load testing part, wherein the bullet acceleration part comprises a high-strength magnet, a bullet attitude control tube, a bullet tail end controller, a linear fixer and a strong spring; the utility model can effectively realize the controllable percussion of bullets with different materials and sizes; the device is light and convenient, can be integrally disassembled and assembled, is easy to operate, has lower cost and has low requirement on test environment; the expandability is strong, the tail end controller of the bullet is changed, the shape of the bullet can be changed, and the like; the bullet acceleration range can be further extended to impact velocities of 30-40m/s using different force springs.

Description

Controllable monofilament fiber transverse impact device

Technical Field

The utility model relates to a technical field of fibre transverse impact test device, concretely relates to monofilament fiber transverse impact device of steerable speed.

Background

The transverse impact properties of the fibers are very important in practical applications, for example, the transverse impact properties of the ballistic fibers in the fiber yarns of body armor, the transverse impact safety of parachute ropes and mine ropes, and the like. At present, the devices related to transverse impact of monofilament fibers mainly comprise SHPB pneumatic emission, laser ablation induced emission, smoothbore gunpowder gun emission and other devices. These devices have complex structures, high manufacturing cost and harsh environmental requirements, and need to be subjected to applicability transformation when relevant research is carried out, so that the test cost is very high. Therefore, it is necessary to design a fiber transverse impact test device capable of accurately inducing bullets and adjusting the striking speed in a large range.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a controllable percussion device of speed for the test bullet, the bullet speed after percussion can reach 0-20m/s, and is continuous controllable. By changing the strength of the strong spring, the device can provide the impact speed of 30-40 m/s. The device can accelerate bullets made of various materials and in various sizes, and has the advantages of wide speed controllable range, simple structure and convenience in use, maintenance and repair.

The utility model discloses mainly realize by following mode:

a controllable monofilament fiber transverse impact device comprises a bullet 1, a dynamic force sensor 2, two beams of infrared laser emission sources 3, a high-strength magnet 4, a smooth support 5, a test sample 6, a laser receiving probe 8, a bullet attitude control tube 9, a bullet tail end controller 10, a linear fixer 11 and a powerful spring 12; the high-strength magnet 4, the bullet attitude control tube 9, the bullet tail end controller 10, the linear fixer 11 and the strong spring 12 form a bullet accelerating part, the two beams of infrared laser emission sources 3 and the laser receiving probe 8 form a bullet speed testing part, and the smooth support 5 and the dynamic force sensor 2 form a fiber transient load testing part; the bullet 1 is lifted to a preset height, the bullet 1 is driven by a powerful spring 12 when the bullet is launched, the posture of the bullet before launching is corrected and fixed by a bullet tail end controller 10 and a linear fixer 11, the bullet 1 is accelerated inside a posture control tube 9, the trajectory of the bullet is induced by a high-strength magnet 4, the bullet 1 flies through two beams of laser 7 launched by two beams of infrared laser launching sources 3, and a laser receiving probe 8 records the time for the bullet 1 to fly through the two beams of laser; the bullet 1 is induced by a high-intensity magnet 4 strong magnetic field, transversely impacts a monofilament fiber test sample 6 fixed with the dynamic force sensor 2 through the smooth support 5, the dynamic force sensor 2 records a transient load signal, and the dynamic force sensor 2 outputs a force value signal to an oscilloscope.

Further, the high-strength magnet 4 is a neodymium iron boron strong magnet, and the size and the material of the high-strength magnet can be changed according to the test requirements.

Further, the strong spring 12 is a latex rubber ring, and the size and material thereof can be changed according to the test requirements.

The utility model has the advantages that:

(1) can effectively realize the controllable percussion of bullets with different materials and sizes.

(2) The device is light and convenient, can be integrally disassembled and assembled, is easy to operate, has lower cost and has low requirement on test environment.

(3) The expandability is strong, and the shape of the bullet can be changed by changing the tail end controller of the bullet; the bullet acceleration range can be further extended to impact velocities of 30-40m/s using different force springs.

Drawings

FIG. 1 is a structural diagram of a controllable monofilament fiber transverse impact device of the present invention;

the designations in the drawings are: 1-a bullet; 2-a dynamic force sensor; 3-two beams of infrared laser emission sources; 4-high-intensity magnet; 5-smooth support; 6-test sample; 7-laser; 8-laser receiving probe; 9-bullet attitude control tube; 10-bullet tail end controller; 11-a linear holder; 12-Strong spring.

Detailed Description

The following is further described by way of examples and figures thereof.

[ example 1 ]

A controllable monofilament fiber transverse impact device comprises a bullet accelerating part, a bullet speed testing part and a monofilament fiber transient load testing part. As shown in fig. 1, the accelerating portion of the bullet 1 is composed of a high-intensity magnet 4 (e.g., neodymium-iron-boron strong magnet), a bullet attitude control tube 9, a bullet tail end controller 10, a linear holder 11, and a strong spring 12. The bullet speed testing part consists of two beams of infrared laser emission sources 3 and a laser receiving probe 8. The fiber transient load testing part consists of a smooth support 5 and a dynamic force sensor 2.

As shown in fig. 1, monofilament fiber test specimen 6 was installed. The bullet 1 is lifted to a preset height (the bullet speed is controlled by strong magnetic field acceleration and gravity acceleration together), the tail end controller 10 and the linear fixer 11 correct and fix the posture of the bullet before being launched, and the bullet 1 is driven by the powerful spring 12 when being launched. The bullet 1 is accelerated inside the attitude control tube 9, and the trajectory of the bullet is induced by the high-strength magnet 4. Before the monofilament fiber is impacted, the time difference of the laser emitting source 3 and the laser receiving probe 8 in the laser system when the monofilament fiber flies through two lasers is recorded, and the flying speed before the impact is calculated. The bullet 1 impacts the monofilament fiber transversely and the dynamic force sensor 2 records the transient load signal.

The specific working principle is as follows:

(1) tension spring 12, tension force F₁When k Δ x is obtained, the deformation amount of the strong spring 12 is Δ x, the elastic coefficient of the strong spring 12 is k, and the elastic potential energy is accumulated in the strong spring 12 and is E₁＝1/2kΔx². And releasing the tail end controller 10 of the bullet and pushing the bullet 1 to perform variable acceleration linear motion under the induction of the high-intensity magnetic field of the high-intensity magnet 4. The length of the acceleration path during the falling of the bullet 1 is Δ L ═ L₂-L₁Wherein L is₁、L₂Respectively as an acceleration starting point and an acceleration end point, and the change quantity of the gravitational potential energy is E₂As Mg Delta L, the high-intensity magnetic field works as

Wherein M is the bullet mass, g is the gravitational acceleration, F₂Is a bullet receivesThe magnetic force is generated by the magnetic force,

μ₀the magnetic field is vacuum magnetic conductivity, B is the magnetic induction intensity at the action surface of the magnetic field and the magnetic conductive material, and S is the area of the action surface of the magnetic field and the magnetic conductive material. The process accelerates the elastic potential energy E of the bullet₁Gravitational potential energy E₂Magnetic force acting E₃Converted into kinetic energy E of bullet₄Considering the energy loss coefficient α, then: e₄＝α(E₁+E₂+E₃) And α is generally taken to be 0.9. This acceleration process satisfies energy conservation, namely: e₄＝1/2Mv²In the formula, E₄V is the velocity attained by the bullet 1, for the kinetic energy of the bullet. The resulting theoretical design velocity attained by the bullet (1) is thus

(2) The bullet 1 flies through two laser beams 7 emitted by two infrared laser emitting sources 3, and a laser receiving probe 8 records the time of the bullet 1 flying through the two laser beams, thereby calculating the actual flying speed of the bullet. And comparing with the theoretical design speed to check the energy loss coefficient alpha.

(3) The bullet 1 is induced by a high-intensity magnet 4 strong magnetic field, impacts a monofilament fiber test sample 6 fixed with the dynamic force sensor 2 through the smooth support 5, and a force value signal is output to an oscilloscope by the dynamic force sensor 2.

Claims

1. A controllable monofilament fiber transverse impact device is characterized in that: the device comprises a bullet (1), a dynamic force sensor (2), two beams of infrared laser emission sources (3), a high-strength magnet (4), a smooth support (5), a test sample (6), a laser receiving probe (8), a bullet attitude control tube (9), a bullet tail end controller (10), a linear fixer (11) and a powerful spring (12); the device comprises a bullet acceleration part, a bullet speed test part and a fiber transient load test part, wherein the bullet acceleration part consists of a high-strength magnet (4), a bullet attitude control tube (9), a bullet tail end controller (10), a linear fixer (11) and a strong spring (12), the bullet speed test part consists of two beams of infrared laser emission sources (3) and a laser receiving probe (8), and the fiber transient load test part consists of a smooth support (5) and a dynamic force sensor (2); the method comprises the steps that a bullet (1) is lifted to a preset height, the bullet (1) is driven by a powerful spring (12) when the bullet is launched, a tail end controller (10) and a linear fixer (11) of the bullet correct and fix the posture of the bullet before launching, the bullet (1) accelerates in a posture control tube (9), the trajectory of the bullet is induced by a high-strength magnet (4), the bullet (1) flies through two beams of laser (7) launched by two beams of infrared laser launching sources (3), and a laser receiving probe (8) records the time for the bullet (1) to fly through the two beams of laser; the bullet (1) is induced by a high-intensity magnet (4) and transversely impacts a monofilament fiber test sample (6) fixed with the dynamic force sensor (2) through the smooth support (5), the dynamic force sensor (2) records a transient load signal, and a force value signal is output to an oscilloscope by the dynamic force sensor (2).

2. A controllable monofilament fiber transverse impact device according to claim 1, wherein: the high-strength magnet (4) is a neodymium iron boron strong magnet, and the size and the material of the high-strength magnet can be changed according to the test requirements.

3. A controllable monofilament fiber transverse impact device according to claim 1, wherein: the strong spring (12) is a latex rubber ring, and the size and the material of the strong spring can be changed according to the test requirements.