Ice mechanical property testing device with two-degree-of-freedom indentation technology

Abstract

The utility model discloses an ice mechanical property testing device with a two-degree-of-freedom indentation technology, which comprises an operation platform, an execution mechanism arranged on the operation platform, a refrigeration and heat insulation mechanism arranged below the execution mechanism and a data processing terminal, the displacement platform is arranged on the supporting frame and has freedom degrees in the Z-axis direction and the X-axis direction, the connecting block is connected with the sliding end of the displacement platform, the pressing head is connected with the bottom end of the connecting block, the pressure detection mechanism is arranged at the bottom of the refrigeration and heat insulation mechanism, and the displacement detection mechanisms are arranged on the two sides of the execution mechanism. And the displacement platform, the pressure detection mechanism and the displacement detection mechanism are in communication connection with the data processing terminal. According to the ice sample mechanical property testing device, mechanical property parameter testing is carried out on different parts of ice samples in different shapes in different environments, meanwhile, the measuring methods and the placing positions of the pressure detection mechanism and the displacement detection mechanism are adjusted, and the ice sample mechanical property testing device has the advantages of being high in accuracy, high in applicability and the like.

Description

Technical Field

[0001] The invention relates to ice mechanical property testing, and more particularly to an ice mechanical property testing device based on a press-in technology. Background Art

[0002] Aircraft flying in low-temperature and humid environments are prone to icing, which will bring various adverse effects to aviation flight, resulting in the inability of various functions of aviation flight devices to operate normally, posing a serious threat to flight safety. Surface icing and anti-icing design are closely related to the fracture behavior of the surface ice layer. Therefore, studying the mechanical properties and fracture behavior of the ice layer at the substrate interface can provide basic theoretical data for the anti-icing and deicing of the fuselage surface, and provide mechanical parameters for the research and numerical simulation of new deicing methods. Due to the particularity of ice materials, there are currently few studies on ice mechanical properties tests at home and abroad. The existing test methods can only obtain the mechanical properties of the ice bulk phase. Affected by temperature, the difficulty of ice sample preparation, and the surface characteristics, the mechanical properties of the ice layer at the substrate interface are completely different from those of the bulk phase ice layer. Affected by the matrix effect, the fracture behavior of the ice layer at the ice / substrate interface cannot be obtained at present.

[0003] At the same time, existing testing devices can usually only test the same part of the ice sample, and cannot obtain the comprehensive changes in the mechanical properties of the ice sample. For example, patent number CN202223452417.0 discloses an ice mechanical properties testing device based on indentation technology. During the test, the device can only perform indentation mechanical experiments on the ice sample in the vertical direction, and cannot fully understand the overall mechanical properties of the ice sample. At the same time, the pressure sensor in the device is located between the pressure head and the connecting seat. During the measurement process, it will deform after being subjected to force and will be affected by the deformation of the pressure head, affecting the displacement measurement and generating systematic errors. This results in errors between the pressure parameters and displacement parameters obtained in the test, which cannot correspond one to one and fail to follow a linear relationship, resulting in test failure. Utility Model Content

[0004] An object of the present invention is to solve at least the above problems and / or disadvantages and to provide at least the advantages to be described below.

[0005] In order to achieve these purposes and other advantages according to the utility model, a testing device for ice mechanical properties with two-degree-of-freedom indentation technology is provided, comprising: an operating platform, an actuator arranged on the operating platform for testing ice samples, a displacement detection mechanism arranged on both sides of the actuator, a refrigeration and heat insulation mechanism arranged under the actuator for placing ice samples, and a data processing terminal connected to the actuator in communication, wherein the actuator comprises:

[0006] A support frame arranged on the operating platform;

[0007] A displacement platform with freedom in the Z-axis direction, which is arranged on a support frame;

[0008] A connecting block fixedly connected to the sliding end in the Z-axis direction of the displacement platform;

[0009] A indenter for indentation testing of ice samples is detachably connected to the middle position at the bottom of the connecting block. It also includes: a pressure detection mechanism arranged at the bottom of the refrigeration and heat insulation mechanism, and displacement detection mechanisms arranged on both sides of the execution mechanism;

[0010] Among them, the displacement platform also has freedom in the X-axis direction, and the displacement platform, the pressure detection mechanism and the displacement detection mechanism are communicatively connected to the data processing terminal.

[0011] Preferably, the pressure detection mechanism is configured as an electromagnetic force analysis balance, which is fixedly placed on the operation platform, and the electromagnetic force analysis balance is communicatively connected to the data processing terminal;

[0012] Among them, the refrigeration and heat insulation mechanism is arranged above the electromagnetic force analysis balance.

[0013] Preferably, the refrigeration and heat insulation mechanism includes: a heat insulation seat arranged on the electromagnetic force analysis balance, a mold arranged on the heat insulation seat and communicated with an external water cooling circulation component, and a refrigeration sheet arranged between the heat insulation seat and the mold for making water samples inside the mold into ice samples.

[0014] Preferably, it also includes: a heat preservation cavity arranged on the electromagnetic force analysis balance;

[0015] Among them, both the heat insulation seat and the refrigeration platform are located inside the heat preservation cavity, and a through hole for the indenter to extend into is opened at the top of the heat preservation cavity.

[0016] Preferably, the displacement detection mechanism includes:

[0017] Two grating displacement rulers vertically arranged on the operation platform, which are located on both sides of the indenter and are communicatively connected to the data processing terminal;

[0018] A reading head fixedly installed in the upper middle part of the indenter.

[0019] The utility model has at least the following beneficial effects: The utility model realizes the mechanical property parameter testing of different parts of ice samples with different shapes under different environments, and at the same time adjusts the measurement methods and placement positions of the pressure detection mechanism and the displacement detection mechanism, and has the advantages of high precision and strong applicability.

[0020] Other advantages, objectives and features of the present utility model will be partially reflected by the following description and partially understood by those skilled in the art through the research and practice of the present utility model. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the present utility model.

[0022] Figure 2 It is a schematic structural diagram of the heat preservation cover of the present utility model.

[0023] Figure 3 It is a schematic diagram of the spatial position relationship among the indenter, the reading head and the grating displacement scale of the present utility model.

[0024] Reference numerals in the figure: 1, operation platform; 2, actuator; 21, support frame; 22, displacement platform; 221, lead screw module I; 222, servo motor I; 223, coupling I; 224, slider I; 225, lead screw module II; 226, servo motor II; 227, coupling II; 228, slider II; 23, connecting block; 24, indenter; 3, displacement detection mechanism; 31, grating displacement scale; 32, reading head; 4, refrigeration and heat insulation mechanism; 41, heat insulation seat; 42, mold; 43, refrigeration chip; 44, heat preservation cavity; 5, data processing terminal; 6, electromagnetic force analytical balance. Detailed Embodiment

[0025] The following further detailed description of the present utility model is provided in conjunction with the drawings so that those skilled in the art can implement it with reference to the description in the specification.

[0026] It should be understood that the terms such as "having", "comprising" and "including" used herein do not exclude the presence or addition of one or more other elements or their combinations.

[0027] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0028] In the description of the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "provided with", "sheathed / connected", "connection", etc. shall be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection, can be a mechanical connection, can be an electrical connection, can be directly connected, or can be indirectly connected through an intermediate medium, and can be the communication between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] In addition, in the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0030] Figure 1 An implementation form of the present utility model is shown, including: an operation platform 1, an execution mechanism 2 provided on the operation platform 1 for testing ice samples, a refrigeration and heat insulation mechanism 4 provided below the execution mechanism 2 for placing ice samples, and a data processing terminal 5 communicatively connected to the execution mechanism 2. The execution mechanism 2 includes:

[0031] A support frame 21 provided on the operation platform 1;

[0032] A displacement platform 22 provided on the support frame 21 and having freedom in the Z-axis direction;

[0033] A connection block 23 fixedly connected to the sliding end in the Z-axis direction of the displacement platform 22;

[0034] A indenter 24 for performing indentation tests on ice samples is detachably connected to the middle position at the bottom of the connection block 23. It further includes: a pressure detection mechanism provided at the bottom of the refrigeration and heat insulation mechanism 4, and displacement detection mechanisms 3 provided on both sides of the execution mechanism 2;

[0035] Among them, the displacement platform 22 further has freedom in the X-axis direction, and the displacement platform 22, the pressure detection mechanism and the displacement detection mechanisms 3 are communicatively connected to the data processing terminal 5.

[0036] Working principle:

[0037] When performing ice mechanics testing on an ice sample, the ice sample is placed inside the refrigeration and heat insulation mechanism 4. The refrigeration and heat insulation mechanism 4 reduces the temperature difference between the inside and outside to prevent changes in the mechanical properties caused by the melting of the ice sample. Then, the indenter 24 of the actuator 2 is adjusted into the refrigeration and heat insulation mechanism 4 through the displacement platform 22. The degrees of freedom in the X-axis and Z-axis directions of the displacement platform 22 are configured to be obtained by using a lead screw structure layout. When the degree of freedom of the X-axis of the displacement platform 22 adopts a lead screw method, it includes: a lead screw module I 221 fixedly connected to the support frame 21, a servo motor I 222 drivingly connected to the lead screw module I 221 through a coupling I 223, and a slider I 224 drivingly connected to the lead screw I on the lead screw module I 221. When the degree of freedom of the Z-axis of the displacement platform 22 adopts a lead screw method, it includes: a lead screw module II 225 fixedly connected to the slider I 224, a servo motor II 226 drivingly connected to the lead screw module II 225 through a coupling II 227, and a slider II 228 drivingly connected to the lead screw II on the lead screw module II 225. The connecting block 23 is fixedly connected to the slider II 228. The servo motor I 222 and the servo motor II 226 are communicatively connected to the data processing terminal 5. By controlling the servo motor II 226 to rotate clockwise or counterclockwise through the data processing terminal 5, the movement of the slider II 228 of the lead screw II is driven to rise or fall. By adjusting the rotation speed of the servo motor II 226, the displacement platform 22 in the Z-axis direction can meet the displacement changes of the indentation test, realizing a range change of the loading speed from 0.005 to 1 mm / s. After the indenter 24 is inserted into the ice sample, by controlling the servo motor I 222 to rotate clockwise or counterclockwise through the data processing terminal 5, the movement of the slider I 224 of the lead screw I is driven to rise or fall. By adjusting the rotation speed of the servo motor I 222, the displacement platform 22 in the X-axis direction can meet the precise fixed displacement changes of the indentation test at different parts of the ice sample. And the indenter 24 of the actuator 2 abuts against the middle position at the top of the ice sample. Subsequently, after starting the actuator 2 to press down the ice sample, it then moves left and right. The displacement detection mechanism 3 detects the displacement of the indenter 24 of the actuator 2. When the actuator 2 presses down to a specified depth, the pressure detection mechanism detects data. The data processing terminal 5 controls the actuator 2 to start moving upward to complete the process of pressure unloading. After the data processing terminal 5 real-time collects the pressure data of the pressure detection mechanism and the displacement data of the displacement detection mechanism 3 and performs calculations, the relevant mechanical properties of the ice sample are obtained. Among them, the detachable method of the connecting block 23 and the indenter 24 is that a connecting cylinder is fixedly connected to the middle position at the bottom of the connecting block 23. The end of the indenter 24 is sleeved inside the connecting cylinder, and a plurality of bolts are symmetrically threadedly connected to the connecting cylinder. And the ends of each bolt are in threaded contact with the end of the indenter 24 through screwing. In this technical solution, the mechanical property parameters of different parts of ice samples with different shapes in different environments are tested, and at the same time, the measurement method and position of the pressure detection mechanism are adjusted, having the advantages of high accuracy and strong applicability.

[0038] In the above technical solution, the pressure detection mechanism is configured as an electromagnetic force analytical balance 6, which is fixedly placed on the operation platform 1, and the electromagnetic force analytical balance 6 is communicatively connected to the data processing terminal 5;

[0039] Among them, the refrigeration and heat insulation mechanism 4 is arranged above the electromagnetic force analytical balance 6. With this technical solution, the electromagnetic force analytical balance 6 has a high precision of one ten-thousandth, and works independently from other mechanisms, without being affected by the errors and deformations of other mechanisms. The electromagnetic force analytical balance 6 can directly detect the pressure of the ice sample on the refrigeration and heat insulation mechanism 4, and can continuously and accurately collect the pressure data generated by the indenter 24. Moreover, the self-displacement of the electromagnetic force analytical balance 6 is small, which can reduce the error generated by displacement measurement.

[0040] In the above technical solution, the refrigeration and heat insulation mechanism 4 includes: a heat insulation seat 41 arranged on the electromagnetic force analytical balance 6, a mold 42 arranged on the heat insulation seat 41 and communicated with an external water cooling circulation component, and a refrigeration sheet 43 arranged between the heat insulation seat 41 and the mold 42 for making the water sample inside the mold 42 into an ice sample. With this technical solution, different-shaped, different-thickness, and different-temperature ice samples are made on the refrigeration sheet 43 using the mold 42, and the refrigeration sheet 43 is a semiconductor refrigeration sheet with a controllable temperature, which provides more possibilities for the experiment; the heat insulation seat 41 is placed between the refrigeration sheet 43 and the electromagnetic force analytical balance 6 to play a role in heat insulation and cold insulation, preventing damage or affecting the accuracy of the electromagnetic force analytical balance 6 due to the too low temperature of the refrigeration sheet 43.

[0041] In the above technical solution, it further includes: a heat preservation cavity 44 arranged on the electromagnetic force analytical balance 6;

[0042] Among them, both the heat insulation seat 41 and the refrigeration platform are located inside the heat preservation cavity 44, and a through hole for the indenter 24 to extend into is opened at the top of the heat preservation cavity 44. With this technical solution, the heat insulation seat 41 and the refrigeration platform arranged inside the heat preservation cavity 44 ensure that the entire experimental environment is in a low-temperature environment, which has a positive impact on maintaining the environmental temperature and reducing the temperature of the indenter 24, and can effectively prevent the ice sample from melting during the experiment and the pressing process, resulting in a change in mechanical properties and thus causing the experiment to fail. At the same time, the through hole opened at the top of the heat preservation cavity 44 can ensure that the indenter 24 will not cause interference when testing the ice sample. It has the advantages of ensuring the accuracy and stability of the experiment.

[0043] In the above technical solution, the displacement detection mechanism 3 includes:

[0044] Two grating displacement rulers 31 vertically arranged on the operating platform 1, which are located on both sides of the indenter 24 and are communicatively connected to the data processing terminal 5;

[0045] A reading head 32, which is fixedly installed on the upper middle part of the indenter 24. With this technical solution, the two grating displacement rulers 31 form a grating by emitting light sources. When the grating detects the reading head 32 on the indenter 24, corresponding data will be recorded. During the continuous movement of the indenter 24 driving the reading head 32, the displacement detection device is communicatively connected to the data processing terminal 5 to continuously collect data; in addition, the grating displacement ruler 31 has unique advantages in detecting displacement. It can perform continuous collection, is not affected by other mechanisms, and the collected data strictly follows the monotonicity principle. The highest precision can reach the mm level, with very good precision and strict compliance with the linear relationship.

[0046] Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily achieved. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrated examples here.

Claims

1. A test device for ice mechanical properties with two-degree-of-freedom indentation technology, comprising: An operating platform, an actuator disposed on the operating platform for testing ice samples, a displacement detection mechanism disposed on both sides of the actuator, a refrigeration and heat insulation mechanism disposed below the actuator for placing ice samples, and a data processing terminal connected to the actuator for communication, wherein the actuator comprises: A support frame arranged on the operating platform; A displacement platform having a degree of freedom in the Z-axis direction is arranged on the support frame; A connecting block fixedly connected to the sliding end of the displacement platform in the Z-axis direction; The middle position of the bottom end of the connecting block is detachably connected with an indenter for performing an indentation test on the ice sample, and is characterized in that it also includes: a pressure detection mechanism arranged at the bottom of the refrigeration and heat insulation mechanism; Wherein, the displacement platform also has a degree of freedom in the X-axis direction, and the displacement platform, the pressure detection mechanism and the displacement detection mechanism are communicatively connected with the data processing terminal.

2. The ice mechanical properties testing device with two-degree-of-freedom indentation technology according to claim 1, characterized in that: The pressure detection mechanism is configured as an electromagnetic force analytical balance, which is fixedly placed on the operating platform, and the electromagnetic force analytical balance is communicatively connected with the data processing terminal; Wherein, the refrigeration and heat insulation mechanism is arranged above the electromagnetic force analytical balance.

3. The ice mechanical properties testing device with two-degree-of-freedom indentation technology according to claim 1, characterized in that: The refrigeration and heat insulation mechanism comprises: a heat insulation seat arranged on the electromagnetic force analytical balance, a mold arranged on the heat insulation seat and connected to an external water cooling circulation component, and a refrigeration sheet arranged between the heat insulation seat and the mold for converting a water sample inside the mold into an ice sample.

4. The ice mechanical properties testing device with two-degree-of-freedom indentation technology according to claim 3, characterized in that: Also includes: A heat preservation chamber provided on an electromagnetic force analytical balance; The heat-insulating seat and the refrigeration platform are both located inside the heat-insulating cavity, and a through hole for the pressure head to extend into is provided on the top of the heat-insulating cavity.

5. The ice mechanical properties testing device with two-degree-of-freedom indentation technology according to claim 1, characterized in that: The displacement detection mechanism comprises: Two grating displacement rulers vertically arranged on the operating platform, located on both sides of the pressure head and connected to the data processing terminal for communication; A reading head is fixedly mounted on the upper middle portion of the pressure head.

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