JP2001091428A - Data sampling method in material testing machine and material testing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a data sampling method in a material testing machine and the material testing device continuously grasping the material testing conditions in a pretreatment process and in a main process. SOLUTION: This material testing machine carries out a material test consisting of a main process applying a target load to a material test piece 1 by automatic control, a pretreatment process before the main process, and a post-treatment process following the main process. The material testing device is provided with an automatic control time storage unit 57 storing load data applied to the material test piece, torsion data, a sampling time and the like sampled in the main process, and independently of the first storage unit, an overall process storage unit 56 storing load data applied to the material test piece, torsion data, a sampling time and the like sampled in the pretreatment process, the main process, and the post-treatment process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data sample method and a material test apparatus in a material test apparatus in which a target load is automatically applied to a material test piece.

[0002]

2. Description of the Related Art Conventionally, in a material test, a pretreatment step of setting a material test piece in a material test apparatus, a main step of automatically applying a target load to the material test piece set in the material test apparatus, and After the end of this process,
And a post-processing step of removing the material test piece from the material test apparatus. In this step, various data such as load data and strain data applied to the material test piece are stored by application software for automatic control. However, in steps other than this step, the application software is not operating, and various data such as load data and strain data applied to the material test piece are not stored. For example, in a material test apparatus that applies three-dimensional stress to a material test piece to pass water, in a pretreatment step, the material test piece is stored in a chamber and set in the material test apparatus, and then the pressure in the chamber is reduced. While increasing to the set pressure, water is flowing through the material test piece. This pretreatment process is performed manually, and various data such as load data and strain data applied to the material test piece are not stored.

[0003]

Incidentally, a load may be applied to the material test piece also in the pre-treatment step and the post-treatment step. In the pre-processing and post-processing steps,
Additional material testing may be performed manually. For example, before starting this step of the material test, it is sometimes necessary to slightly change the pressure of flowing water to consider how the overall balance changes. Further, it is desirable from the viewpoint of performing a material test to smoothly shift from the pretreatment step to the start state of the present step. In particular, in a material test apparatus in which water is applied by applying a three-dimensional stress to a material test piece, the pressure in the chamber is manually increased in the pretreatment step, and then water is passed. For example, the balance of pressure may be lost, and it may take time to move from the pretreatment process to the state at the start of the present process. Therefore, it is desired that the state of the material testing apparatus be grasped in the pre-processing step and the post-processing step as well as in the present step.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a data sampling method and a material test method in a material test apparatus capable of continuously grasping a pretreatment process of a material test and a state in this process. It is intended to provide a device.

[0005]

According to the data sampling method of the present invention, there are provided a main step of automatically applying a target load to a material test piece (1), a pre-processing step prior to the main step, and a pre-processing step. It is used in a material testing apparatus for performing a material test including a post-processing step. Then, in the present step, at least load data and strain data applied to the material test piece are sampled, and the load data,
A first sampling for storing the strain data and the sampling time, and separately from the first sampling, in the pre-processing step and the present step, at least load data and strain data applied to the material test piece are sampled,
The second sampling for storing the load data, the strain data, and the sampling time is performed.

Further, the second sampling may be performed in a post-processing step following the pre-processing step and the main step.

Further, a pre-processing step and a post-processing step include:
It may have been performed manually.

Then, a pretreatment step of setting the material test piece in the chamber (2) and increasing the pressure in the chamber, and a main step of automatically applying a target load to the material test piece set in the pretreatment step And a data sample method in a material test apparatus for performing a material test having a post-processing step of removing the material test piece after the end of this step, wherein in this step, at least load data and strain data applied to the material test piece And a first sampling for storing the load data, the strain data and the sampling time, and separately from the first sampling, in the pre-processing step and the present step, at least:
The load data and the strain data applied to the material test piece are sampled, and the second sampling for storing the load data, the strain data and the sampling time is performed.

Further, the material testing apparatus of the present invention comprises a main step of automatically applying a target load to a material test piece, a pre-processing step before the main step, and a post-processing step after the main step. Material tests. Then, a first storage unit (57) that stores at least load data, strain data, and a sampling time applied to the material test piece sampled in this step, and separately from the first storage unit, A second storage unit (56) is provided for storing at least load data, strain data, and sampling time applied to the material test specimen sampled in the process.

Further, the second storage unit may store at least load data, strain data and sampling time applied to the material test specimen sampled in the pre-processing step and the post-processing step following this step. .

A pretreatment step of setting the material test piece in the chamber and increasing the pressure in the chamber; a main step of automatically applying a target load to the material test piece set in the pretreatment step; After the end of the step, in the material test apparatus for performing a material test having a post-processing step of removing the material test piece, a load data, a strain data, and a sampling time applied to the material test piece sampled in the main step are stored at least. A first storage unit and, apart from the first storage unit, a second storage unit that stores at least load data, strain data, and sampling time applied to the material test specimen sampled in the preprocessing step and the main step. May be.

[0012]

Next, an embodiment of a material testing apparatus according to the present invention will be described. FIG. 1 is a block diagram showing the configuration of an embodiment of the material testing apparatus of the present invention. FIG. 2 is a schematic diagram illustrating stress and shear force applied to a material test piece. FIG. 3 is a flowchart of a material test.
FIG. 4 is a continuation of the material test flowchart of FIG.
5A and 5B are time charts of a material test, in which FIG. 5A is a time chart of an ambient pressure, FIG. 5B is a time chart of a displacement of an actuator for an ambient pressure, and FIG. 5C is a time chart of an output of a compression displacement sensor. 6A and 6B are time charts of the material test, in which FIG. 6A is a time chart of the detected value of the load sensor, and FIG. 6B is a time chart of the stress σn perpendicular to the shear plane. FIG. 7 is a time chart showing the sampling timing of the material test. 8A and 8B are diagrams of a table of the storage unit. FIG. 8A is a table of the storage unit for all processes, and FIG. 8B is a table of the storage unit for automatic control. The material testing apparatus is controlled by a controller and a host computer. However, FIG. 1 illustrates the material testing apparatus as a plurality of blocks without distinguishing between the controller and the host computer.

In FIG. 1, a cylindrical material test piece 1 having a diameter of about 20 to 30 mm is housed in an airtight chamber 2. Further, the fixed support portion 3 and the movable support portion 4 are arranged to face each other with the material test piece 1 interposed therebetween. A cylindrical sealing material 5 covers the distal end of the fixed support 3, the distal end of the movable support 4, and the material test piece 1. A water passage 6 through which water flows toward the material test piece 1 is formed in the fixed support portion 3, and a drain passage 7 is formed in the movable support portion 4. The movable support 4 is driven and moved by a hydraulic compression actuator 9. The amount of movement of the movable support unit 4, that is, the amount of displacement of the drive unit of the compression actuator 9, is used as distortion data as the displacement sensor 1 for compression.
1 has detected. The load sensor 12 detects a load F applied to the material test piece 1 by the compression actuator 9 as load data. Further, the inside of the chamber 2 is connected via a pipe 16 to a pressure intensifier 17 composed of a high-pressure gas cylinder, a compressor, and the like. Further, a cylinder device 21 is connected to the pipe 16,
The piston 22 of the cylinder device 21 is driven by a hydraulic actuator 23 for ambient pressure. Piston 22
, That is, the displacement of the drive unit of the ambient pressure actuator 23 is detected by the ambient pressure displacement sensor 24.
Further, an ambient pressure detection sensor 26 that detects an ambient pressure Pc that is a pressure in the chamber 2 is attached to the pipe 16. The discharge passage from the pump 27 is connected to the water passage 6 of the fixed support portion 3.
When the 7 operates, the water in the water tank 28 is sucked and discharged to the water passage 6. The discharge pressure of the pump 27 is detected by a water pressure sensor 29. Further, the water that has flowed into the drainage channel 7 of the movable support portion 4 has returned to the water tank 28.

A compression target value generator 31 serving as a compression target value generator outputs a compression control target input signal Ei to an adder 32. The detection signal Da of the compression displacement sensor 11 is amplified by the sensor amplifier 30 and output to the adding unit 32. The adder 32 calculates a difference signal Er by subtracting the compression displacement detection signal Da from the compression control target input signal Ei, and outputs the difference signal Er via the amplifier 33 to the servo valve of the compression actuator 9. 34.

An ambient pressure target value generator 41 as an ambient pressure target value generator outputs an ambient pressure control target input signal Es to an ambient pressure adder 42. The output signal Ds from the ambient pressure displacement sensor 24 is amplified by the sensor amplifier 43 and output to the ambient pressure adding unit 42 via the displacement control switch 45a. Further, the ambient pressure detection sensor 26
Is amplified by the sensor amplifier 44 and output to the ambient pressure addition unit 42 via the pressure control switch 45b. When one of the switches 45a and 45b is ON, the other is OFF. The detection signal E of the load sensor 12 is supplied to the ambient pressure target value generator 41.
f is input via the sensor amplifier 46, and the detection signal Dp of the ambient pressure detection sensor 26 is input. The output of the ambient pressure addition unit 42 is supplied to an amplifier 47.
Is input to the servo valve 48 of the actuator 23 for ambient pressure.

Further, a heater 51 for heating the gas in the chamber 2 is provided.
A temperature sensor 52 detects the temperature of the gas inside the chamber. The material testing apparatus has a storage unit 56 for all processes as a second storage unit and a storage unit 57 for automatic control of the first storage unit.
And a detection signal D of the compression displacement sensor 11 is provided.
a, the detection signal Ef of the load sensor 12, the detection signal of the temperature sensor 52, the detection signal Dp of the ambient pressure detection sensor 26, and the detection signal of the water pressure sensor 29 are converted into sensor amplifiers 30 and 4
4, 46, 61, and 62. The storage unit 56 for all processes and the storage unit 57 for automatic control store the sensors 11, 12,
The detection data of 26, 29, and 52 are sampled and stored, and the sampling time is also stored. The storage unit 56 for all processes and the storage unit 57 for automatic control are configured by a RAM, a hard disk, or the like, and store data in the form of a table as shown in FIG.
They are stored in different locations (addresses), and are stored in different files. The items stored in the storage unit for all processes 56 and the items stored in the storage unit 57 for automatic control are the same.

In the material testing apparatus having such a configuration, when the compression actuator 9 is operated, a compressive load F is applied to the material test piece 1. The chamber 2 is filled with an inert gas such as argon gas by the pressure intensifier 17,
The pressure in the chamber 2 is increased to a higher pressure than the atmospheric pressure, and an ambient pressure Pc can be applied to the material test piece 1 from the surroundings. This ambient pressure Pc is equal to the ambient pressure actuator 2
3 can be adjusted. Thus, as shown in FIG. 2, the load F and the ambient pressure Pc are applied to the material test piece 1. If the cross-sectional area of the material test piece 1 in a plane perpendicular to the load direction of the load F is A, the stress σf becomes F / A.

Further, the material test piece 1 has a shear surface b such as a tomographic surface which is relatively low in shearing strength and shears when a large load F is applied. It is inclined at an angle θ to the direction. In addition,
In FIG. 2, the symbol σn is a stress applied perpendicular to the shear plane b, and the symbol τ is a shear force applied to the shear plane b. And
The mechanical balance is as shown in the following equation (1). 1) Pc = σn− (sinθ × sinθ) × σf In the ground, the stress σn is substantially constant and the stress σf increases (that is, the shearing force τ increases), so that the shear plane b as the fault plane b The phenomenon of slippage has occurred.

Therefore, in this material testing apparatus, in order to reproduce the underground phenomenon, the load F (ie, A × σf)
As the pressure increases, the ambient pressure actuator 23 is operated to lower the ambient pressure Pc, and the stress σn is maintained substantially constant (that is, the initial stress σn0 is maintained). When the load F is 0, the stress σn is equal to the ambient pressure Pc. Since (sin θ × sin θ) / A is determined before the material test and is constant during the material test, it is calculated in advance. This value is treated as a constant in the control during the material test.

Next, the flow of the material test will be described with reference to the flowcharts of FIGS. First of all,
In step 1, the main power supply of the material testing apparatus is turned on. Then, various sensors 11, 12, 26, 29, 5
2 and sensor amplifiers 30, 44, 46, 61, 62
Is activated, and its output is sampled at every time interval ta based on the output of the timer 66 and input to the storage unit 56 for all processes, and as shown in FIG. It is stored together with the sampling time. The sampling time interval ta can be specified by the operator. This sampling (hereinafter, referred to as “second sampling”) and the storing operation are continuously performed in all steps of the material test. The timer 66 is driven by a battery power supply or the like, and operates even when the main power supply is turned off.

In the initial state, the displacement control switch 45a is ON and the ambient pressure target value generator 4
1. A displacement feedback control loop is composed of the ambient pressure addition unit 42, the servo valve 48, the ambient pressure actuator 23, the ambient pressure displacement sensor 24, and the like.
The ambient pressure addition unit 42 subtracts the output signal Ds of the ambient pressure displacement sensor 24 from the ambient pressure control target input signal Es and outputs the result to the servo valve 48. Then, in step 2, a center position signal for setting the piston 22 to the center position is
It is set in the ambient pressure target value generator 41. Then, the ambient pressure target value generator 41 outputs a target position signal as the ambient pressure control target input signal Es, and outputs the ambient pressure actuator 23
Of the piston 22 to the center position.

Next, in step 3, the material test piece 1 is put into the chamber 2 of the material test apparatus, and the compression actuator 9 is manually operated, and the fixed support portion 3 and the movable support portion 4 1 Set lightly.

After setting the material test piece 1, in step 4, the pressure intensifier 17 is operated manually to increase the pressure in the chamber 2, that is, the ambient pressure Pc, and to increase the pressure at the start of the main process of the material test (for example, , Up to 400MP
Increase pressure to a). In step 5, the heater 5
1 is operated, and the temperature in the chamber 2 is manually increased to the temperature at the start of this step of the material test (for example, about 700 ° C.). At this time, the pressure intensifier 17 is operated to maintain the ambient pressure Pc substantially constant. Next, in step 6, the pump 27 is operated to flow water to the material test piece 1 through the water passage 6. Then, the water pressure passing through the material test piece 1 is slightly changed by a manual operation, and a test is performed to see how the overall balance changes. Then, the ambient pressure P
c and the temperature in the chamber 2 are adjusted to the state at the start of this step of the material test. In step 7, the compression displacement sensor 11 is reset and its current position is set to zero. This completes the preparation for the main step of the material test, that is, the pretreatment step. The steps from step 1 to step 7 are the pre-processing steps of the material test.
Is set manually or semi-automatically. Thus, the temperature in the chamber 2 and the ambient pressure Pc
When the value reaches a predetermined value, the application program is activated to automatically perform the main step of the material test as shown in the following steps.

In step 8, the ambient pressure detection sensor 2
6 detects the ambient pressure Pc, which is the initial stress σn0, as an initial value, and inputs a detection signal to the ambient pressure target value generator 41. The storage unit is provided in the ambient pressure target value generator 41 and stores the initial value of the ambient pressure Pc. In addition, the displacement control switch 45a is turned off and the pressure control switch 45b is turned on, so that the ambient pressure target value generator 41, the ambient pressure adding unit 42, the servo valve 48, the ambient pressure actuator 23, and the ambient pressure detection sensor 26 A feedback control loop for pressure is constituted by the above, and the adding section 42 for ambient pressure subtracts the detection signal Dp of the ambient pressure detection sensor 26 from the control target input signal Es for ambient pressure and outputs it to the servo valve 48. Then, the ambient pressure target value generator 41 outputs the initial value of the ambient pressure Pc which is the target pressure signal as the ambient pressure control target input signal Es, and maintains the ambient pressure Pc at the initial value, that is, the initial stress σn0.

In step 9, the outputs of the various sensors 11, 12, 26, 29, 52
Is sampled at each time interval tb based on the output of the control unit, and is input to the automatic control storage unit 57, and as shown in FIG. 8B, the data is stored together with the sampling time. The sampling (hereinafter, referred to as “first sampling”) and the storage operation are performed by the application program, and are continuously performed in this step of the material test, but are not performed in other steps. The time interval tb of the first sampling is shorter than the time interval ta of the second sampling.

Next, in step 10, the compression target value generator 31 outputs a target displacement signal that increases at a constant speed, and the compression actuator 9 operates as shown in FIG. 4 is moved at a constant speed toward the material test piece 1, and a compressive load F is applied to the material test piece 1. This load F gradually increases as shown in FIG.

In step 11, the material test piece 1
The load sensor 12 detects the load F applied to the target and outputs it to the target ambient pressure generator 41. The ambient pressure target value generator 41 calculates the ambient pressure P, which is the target value, according to the above equation (1).
Seeking c. That is, it is a constant (sin θ × sin
θ) / A multiplied by load F is stored as ambient pressure P
Subtracting from the initial stress σn0 which is the initial value of c, the ambient pressure Pc
Is determined, and the routine proceeds to step 12. Step 12
, The ambient pressure target value generator 41 calculates the ambient pressure Pc
Is output to the ambient pressure addition unit 42, and the ambient pressure actuator 23 is operated as shown in FIG.
The pressure in the chamber 2 is set to the target value of the ambient pressure Pc. Next, in step 13, it is determined whether or not the present step of the material test has been completed. If the processing has not been completed, the process returns to step 10, and steps 10 to 13 are repeated at intervals of, for example, 0.2 seconds. And
The pressure in the chamber 2 increases in proportion to the increase in the load F, as shown in FIG.
As shown in FIG. FIG.
As shown in (b), the stress σn perpendicular to the shear plane b is maintained substantially constant. In this manner, the material test is performed, and the material test piece 1 can be sheared along the shear plane b to break, and the test can be performed until the output of the load sensor 12 becomes substantially zero. It is also possible to stop on the way without breaking the test piece 1. Then, when this step is completed, the process goes from step 13 to step 14 as described above.

When the main step of the material test is completed in this way, the operation of the application program is terminated, and then a post-processing step of removing the material test piece 1 from the material test apparatus by manual operation is performed in step 14.

In step 14, the heater 51, the pump 27, the ambient pressure actuator 23 and the intensifier 1
7, the temperature inside the chamber 2 is made substantially equal to the outside air temperature, the water flow to the water passage 6 is stopped, and the ambient pressure Pc is brought to the atmospheric pressure. And the compression actuator 9
While manually or semi-automatically operating the material test piece 1
Remove. The removed material test piece 1 is appropriately stored. This concludes the material test.

After the completion of the material test, various data stored in the storage unit for all processes 56 are displayed on a monitor or the like and examined. Since the sampling time is stored as data in the storage unit for all processes 56, the sampling time can be examined in comparison with the operation time of the material test. Although there are various contents to be examined, for example, in Step 6, an influence test of the water pressure fluctuation of the passing water performed manually is considered. In addition, the process from step 4 to step 7 of the pretreatment process is examined so that the process can be smoothly shifted from the pretreatment process to the present process in the next material test.

As described above, in this embodiment, the load F can be increased while maintaining the stress .sigma.n perpendicular to the shear plane b substantially constant, so that the actual underground state is substantially reproduced. be able to. In addition, since data is continuously sampled in all steps of the pre-processing step, the main step and the post-processing step, the data is transferred from the pre-processing step to the main step or from the main step to the post-processing step. Can be easily examined after the end of the material test. As a result, the next material test can be performed smoothly based on the result of the examination. In particular, in the pretreatment step of this embodiment,
The material test piece is set in the chamber, and the pressure in the chamber is increased, and water is passed after the pressure in the chamber is increased.Therefore, when the water is passed, the pressure balance in the chamber may be lost. It may take time to move to this step. However, since various data such as pressure, water pressure, load data and strain data in the chamber are continuously sampled in the pretreatment process and this process, this data is examined and the next material test is performed in the previous process. It can be performed more smoothly.

The material test is not limited to a test using a chamber, but can be another material test. The data sampled in the second sampling and the data stored in the second storage unit include at least load data, strain data, and other data such as pressure data in the chamber if the sampling time is included. It is also possible to include. The second sampling and the second storage section only need to target data in at least both the pre-processing step and the present step, and the data in the post-processing step can be set as a target or not. Is also possible.

Although the sampling time interval is set in advance, it is not necessarily required to be constant over the entire period of the pre-processing step and the main step, and the time interval can be changed in the middle. Load data and strain data applied to the sampled material specimen can be detected by attaching a sensor directly to the material specimen, or indirectly by attaching the sensor to a compression actuator or the like. It is possible. Further, the storage unit for storing data can be provided outside the main body of the material testing apparatus.

The items stored in the first storage section and the second
The items stored in the storage unit are the same in the embodiment, but can be different. Similarly, the items sampled by the first sampling and the items sampled by the second sampling are the same in the embodiment, but may be different. However, at least the load data, the strain data, and the sampling time need to be sampled and stored.

Further, when the data stored in the storage unit for all processes 56 is output to the outside, a phenomenon in the test process can be considered even when the material test is stopped. Further, in the embodiment, the time interval ta of the second sampling is longer than the time interval tb of the first sampling, but may be the same time interval ta. However, due to the storage capacity, it is preferable that the time interval of the second sampling be longer than the time interval tb of the first sampling.

[0036]

According to the present invention, in this step performed by the automatic control, the first sampling is performed and stored in the first storage unit. In this step, the second sampling is performed and stored in the second storage unit. Therefore, by observing the data of the second sampling after the end of the material test or the like, the phenomenon from the pretreatment step to the present step can be continuously considered. As a result, the transition from the pretreatment step of the next material test to this step can be smoothly performed, and data of additional experiments performed in the pretreatment step can be easily considered.

Further, when the second sampling is performed up to the post-processing step after the pre-processing step and the main step, the phenomena of all the steps of the material test can be easily and continuously considered.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a material testing apparatus according to the present invention.

FIG. 2 is a schematic diagram illustrating stress and shear force applied to a material test piece.

FIG. 3 is a flowchart of a material test.

FIG. 4 is a continuation of the material test flowchart of FIG. 3;

5A and 5B are time charts of a material test, wherein FIG. 5A is a time chart of ambient pressure, FIG. 5B is a time chart of displacement of an actuator for ambient pressure, and FIG. 5C is a time chart of output of a displacement sensor for compression. It is.

FIGS. 6A and 6B are time charts of a material test, wherein FIG. 6A is a time chart of a detection value of a load sensor, and FIG. 6B is a time chart of a stress σn perpendicular to a shear plane.

FIG. 7 is a time chart showing sampling timing of a material test.

8A and 8B are diagrams of a table of a storage unit, where FIG. 8A is a table of a storage unit for all processes, and FIG. 8B is a table of a storage unit for automatic control.

[Explanation of symbols]

 Reference Signs List 1 material test piece 2 chamber 56 storage unit for all processes (second storage unit) 57 storage unit for automatic control (first storage unit)

Claims (7)

[Claims] 1. A material test apparatus for performing a material test including a main step of automatically applying a target load to a material test piece, a pre-processing step before the main step, and a post-processing step after the main step. A data sampling method, wherein at least the load data and the strain data applied to the material test specimen are sampled in the present step, and the load data, the strain data and the sampling time are stored; Separately from the sampling, in the pre-processing step and the present step, at least load data and strain data applied to the material test piece are sampled, and the load data, strain data and the sampling time are stored.
A data sampling method in a material testing apparatus, wherein sampling is performed. 2. The data sampling method according to claim 1, wherein the second sampling is also performed in a post-processing step following the pre-processing step and the main step. 3. The data sampling method in a material testing apparatus according to claim 1, wherein the pre-processing step and the post-processing step are performed manually. 4. A pretreatment step of setting a material test piece in a chamber and increasing a pressure in the chamber;
A data sampling method for a material testing apparatus for performing a material test, comprising: a main step of automatically applying a target load to a material test piece set in a pre-processing step; and a post-processing step of removing the material test piece after completion of the main processing step. In this step, at least load data and strain data applied to the material test piece are sampled, and the load data, strain data and sampling time are stored, and a first sampling is separately performed. In the pre-processing step and the present step, at least the load data and the strain data applied to the material test piece are sampled, and the load data, the strain data and the sampling time are stored.
A data sampling method in a material testing apparatus, wherein sampling is performed. 5. A material testing apparatus for performing a material test including a main step of automatically applying a target load to a material test piece, a pre-processing step before the main step, and a post-processing step after the main step. In the first storage unit that stores at least load data, strain data, and sampling time applied to the material test piece sampled in the main process, and separately from the first storage unit, A material testing apparatus comprising: a second storage unit that stores at least load data, strain data, and sampling time applied to a sampled material test piece. 6. The method according to claim 6, wherein the second storage unit stores at least load data, strain data, and sampling time applied to the material test specimen sampled in the pre-processing step and the post-processing step following this step. The material testing apparatus according to claim 5, wherein 7. A pretreatment step of setting a material test piece in a chamber and increasing a pressure in the chamber;
In a material testing apparatus for performing a material test, which includes a main step of automatically applying a target load to the material test piece set in the preprocessing step and a post-processing step of removing the material test piece after completion of the main step, A first storage unit that stores at least load data, strain data, and a sampling time applied to the material test piece sampled in the process, and separately from the first storage unit, the material sampled in the pretreatment process and the main process. A material testing apparatus, comprising: a second storage unit that stores at least load data, strain data, and sampling time applied to a test piece.