Micro solid propellant multi-angle in-situ loading device

Abstract

The utility model relates to a micro solid propellant multi-angle in-situ loading device, and belongs to the field of material mechanics testing instruments. The loading device is arranged in a horizontal structure and mainly comprises a guide rail support, a stepping motor, a lead screw, a sliding block, a force sensor, a turning disc and a clamp; in-situ loading power is output by a stepping motor and drives a sliding block to move by means of a rotary lead screw to achieve axial loading, multiple angles are achieved by fixing a clamp in different directions of a turning disc, and multi-angle in-situ loading is achieved through cooperation of the clamp and the turning disc. And a tension-displacement curve is recorded through the speed of the tension sensor and the stepping motor. The multi-angle in-situ loading device is exquisite in structure and suitable for multi-angle in-situ loading of the micro-size solid propellant, and the mechanical response and damage evolution of the propellant under different load conditions are revealed.

Description

Technical Field

[0001] The utility model relates to the field of mechanical testing instruments, in particular to a micro solid propellant multi-angle in-situ loading device in a solid propellant multi-angle loading damage and mechanical property experiment process. Background Art

[0002] Testing the mechanical properties of materials is an essential part of engineering applications and is also one of the basic bases for judging their applicability and reliability, especially in the fields of machinery, construction, transportation, aviation, aerospace, etc. At present, the testing of material mechanics focuses more on the macroscopic overall performance. The instruments used are mostly large machines with complex structures, high costs, and large volumes. Their sensitivity and accuracy are difficult to meet the requirements. At the same time, due to the influence of size effects, the test of macroscopic overall performance is difficult to reflect the mechanical properties of microscale materials and it is difficult to characterize the damage evolution of microscale materials. In addition, monotonic axial loading is difficult to simulate the actual working conditions of the material and cannot reflect its multi-directional loading damage.

[0003] For solid propellants, their mechanical properties and structural damage are the basis for judging their reliability during long-term storage and use, and are also the data support for inferring their lifespan. At present, the damage judgment and mechanical testing of solid propellants are still based on the phenomenological characterization of large specimens, and can only perform single-angle loading. It can neither simulate the actual loading conditions nor intuitively show the process of damage initiation and evolution, which makes it difficult to meet the requirements of precise judgment and exploration of underlying mechanisms.

[0004] Therefore, there is an urgent need to develop an in-situ multi-angle loading device suitable for micro-sized specimens. Summary of the invention

[0005] The purpose of the utility model is to overcome the shortcomings of the above-mentioned existing instruments and provide a device suitable for multi-angle in-situ loading of micro-sized solid propellants, so as to facilitate multi-condition testing of micro-scale specimens, and obtain the mechanical properties of micro-sized specimens under multi-angle loading by comparing deformation and load size, and reveal the instability and damage evolution of solid propellants under complex conditions. The loading device has the characteristics of compact structure, small size, high precision and sensitivity for micro specimens, and is particularly suitable for multi-angle in-situ loading tests of composite materials such as solid propellants.

[0006] The above-mentioned purpose of the utility model is achieved through the following technical solutions:

[0007] A multi-angle in-situ loading device for micro solid propellant adopts a horizontal structural layout as a whole, and mainly includes a clamp, a first steering disc, a second steering disc, a stepping motor, a lead screw, a slider, a force sensor, and a guide rail support; a first steering disc is provided at one end of the sample, and a second steering disc is provided at the other end of the sample, and clamps connected to the first steering disc and the second steering disc by limit screws are provided between the first steering disc and the second steering disc and the sample, the first steering disc is fixed to the slider by fixing screws, and a force sensor is provided at the rear end of the second steering disc.

[0008] The clamp, the first steering wheel and the second steering wheel are all made of 304 stainless steel.

[0009] A lead screw which is through-type sleeved on the slider is provided on the lower side of the sample, one end of the lead screw is inserted and connected to the stepping motor, and the other end is inserted and connected to the guide rail support.

[0010] One end of the guide rail support is connected to the stepping motor, and the force sensor is fixed to the other end of the guide rail support by a fixing bolt.

[0011] The deformation of the sample within the gauge length section is obtained by a stepper motor, and the load borne by the sample is obtained by a force sensor.

[0012] The beneficial effects of the utility model are: compact structure, small size, high precision and sensitivity for micro specimens, ability to provide loading tests at multiple angles, satisfying the load simulation of materials under complex working conditions, and able to reflect the damage evolution process of solid propellant. Compared with traditional uniaxial large load tests, the test instruments and methods used in the utility model are more intuitive and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0014] Figure 2 It is a schematic diagram of the clamp of the utility model;

[0015] Figure 3 This is a schematic diagram of a first steering wheel of the utility model;

[0016] Figure 4 This is a schematic diagram of a second steering wheel of the present utility model;

[0017] In the figure: 1. fixture; 2. first steering wheel; 3. second steering wheel; 4. stepper motor; 5. lead screw; 6. slider; 7. force sensor; 8. guide rail support; 9. sample; 10. limit screw; 11. fixing screw; 12. fixing bolt. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example 1

[0020] See also Figures 1 to 4 As shown, the micro solid propellant multi-angle in-situ loading device of the utility model adopts a horizontal structural arrangement, and mainly comprises a clamp (1), a first steering disc (2), a second steering disc (3), a stepping motor (4), a lead screw (5), a slider (6), a force sensor (7), and a guide rail support (8); one end of the sample (9) is provided with a first steering disc (2), and the other end of the sample (9) is provided with a second steering disc (3) to ensure the realization of multi-angle loading, and the first steering disc (2) and the second steering disc (3) are both provided with a clamp (1) connected to the first steering disc (2) and the second steering disc (3) through a limit screw (10) between the first steering disc (2) and the second steering disc (3) and the sample (9) to prevent the movement of the sample during the loading process, and the first steering disc (2) is fixed to the slider (6) through a fixing screw (11), and the rear end of the second steering disc (3) is provided with a force sensor (7). The clamp (1), the first steering disc (2), and the second steering disc (3) are all made of 304 stainless steel.

[0021] See also Figure 1 As shown, the stepper motor (4) and the force sensor (7) are horizontally and symmetrically installed on both sides of the guide rail support (8). The in-situ loading is performed by outputting power through the stepper motor (4), driving the lead screw (5) to rotate, and synchronously driving the slider (6) installed through the lead screw (5) to move axially, and driving the first steering disc (2) to move through the fixing screw (11), thereby realizing in-situ loading of the sample (9) with the help of the clamp (1).

[0022] See also Figure 1 As shown, the second steering disc (3) bears the load force transmitted by the sample (9) through the clamp (1) under the influence of the interaction force, and transmits the load to the force sensor (7) through a screw connected to the force sensor (7).

[0023] See also Figure 2 As shown, the sample is fixed by a fixture (1), and fixtures of different shapes and sizes can be made according to different samples.

[0024] See also Figure 3 , Figure 4As shown, the axial load is converted into a multi-angle load through the first steering disc (2) and the second steering disc (3). The threaded hole spacing angle can be set according to the external load requirements. The threaded hole size and the inner and outer diameter dimensions of the steering disc can be set according to the fixture (1) to meet the requirements of different specimens and external load experiments.

[0025] See also Figure 1 As shown, after the installation and pre-tightening of the specimen are completed, before the experiment begins, the force sensor data is cleared, the current position is set as the coordinate origin, and the speed and loading method of the stepper motor are set. After the experiment begins, the distance moved by the slider (6), that is, the deformation of the specimen (9), is calculated by time and speed, the load value is read by the force sensor, and the loading angle is obtained by the steering wheel. During the experiment, the damage evolution of the sample (9) can be intuitively observed by setting a minimum loading rate of 0.01 mm / s.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multi-angle in-situ loading device for micro solid propellant, comprising a sample (9), characterized in that: The sample (9) is provided with a first steering disc (2) at one end and a second steering disc (3) at the other end. A clamp (1) connected to the first steering disc (2) and the second steering disc (3) and the sample (9) is provided between the first steering disc (2) and the second steering disc (3) via a limit screw (10). The first steering disc (2) is fixed to the slider (6) via a fixing screw (11). A force sensor (7) is provided at the rear end of the second steering disc (3).

2. The multi-angle in-situ loading device for micro solid propellant according to claim 1, characterized in that: The clamp (1), the first steering wheel (2), and the second steering wheel (3) are all made of 304 stainless steel.

3. The multi-angle in-situ loading device for micro solid propellant according to claim 1, characterized in that: The lower side of the sample (9) is provided with a lead screw (5) which is through-type sleeved on the slider (6); one end of the lead screw (5) is plugged and connected to the stepping motor (4), and the other end is plugged and connected to the guide rail support (8).

4. The multi-angle in-situ loading device for micro solid propellant according to claim 3, characterized in that: One end of the guide rail support (8) is connected to the stepper motor (4), and the force sensor (7) is fixed to the other end of the guide rail support (8) by means of a fixing bolt (12).

5. The multi-angle in-situ loading device for micro solid propellant according to claim 4, characterized in that: The deformation of the sample (9) within the gauge length section is obtained by a stepping motor (4), and the magnitude of the load borne by the sample (9) is obtained by a force sensor (7).

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