JP2005338026A - Compact apparatus and method for testing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact apparatus for testing a material, which can apply a sufficient load to a minute object to be tested being sampled from an actual equipment structure and carry out a test at the site where the object to be tested is sampled. <P>SOLUTION: One end of the object to be tested is supported by a stationary chuck, and the other end is supported by a movable chuck, and a load is applied to the object to be tested in its tensile / compressive direction by a super-magnetostrictive actuator used for tensile / compressive operations, and a torsional load is applied to the object to be tested by a super-magnetostrictive actuator used for torsional operations. A controller unit controls the super-magnetostrictive actuators respectively used for tensile / compressive and torsional operations, based on a tensile / compressive load and a torsional torque on the object to be tested, which are detected by a load / torque sensor, or based on a tensile / compressive displacement and a rotational displacement of the movable chuck, which are detected by a noncontact displacement gauge. Therefore, the apparatus can be made compact and apply a big load to the object to be tested. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a small material testing apparatus and a material testing method suitable for conducting a material property test of a minute specimen of a metallic material or a nonmetallic material on site.

  Various fatigue tests such as a tensile test and a fatigue test are performed in order to evaluate the material characteristics of a metal material or a non-metal material. In general, the material property test is performed using a specimen simulating a damaged structure, and the above-described various material property evaluation tests are performed by applying a load to the specimen using a hydraulic actuator or the like.

  It is very important to evaluate the material characteristics of the actual machine structure that is actually damaged. Cut the specimen directly from the actual machine structure and move the specimen to the place where the material test equipment is installed. Evaluation tests are often performed.

  When conducting a material property evaluation test that is performed by cutting out the specimen directly from the actual structure using a conventional material testing device, the specimen size increases to over a dozen centimeters. As a result, the functional and economic losses to the structure are very large, and the cut specimen must be moved to the place where the material testing equipment is installed. Often not.

  For this reason, a small specimen can be collected from the actual machine structure, and the collected specimen can be tested with the same or higher accuracy than before. Development of a small-sized material testing apparatus that can perform the above has been desired.

As a small-sized material testing apparatus capable of performing material property tests on a minute specimen, for example, there is one using a piezoelectric actuator made of a piezoelectric element as a load generation source. By using such a piezoelectric element, a small size can be obtained. The material test apparatus itself is downsized (see, for example, Patent Document 1).
JP 2000-298087 A

  However, in a small material testing apparatus using a piezoelectric actuator composed of a piezoelectric element, the piezoelectric element is used to reduce the size, but it is difficult to apply a large load.

  On the other hand, in a material testing apparatus using a hydraulic actuator as a load generation source, there is a limit to the size of a specimen that can be accurately tested, and is not suitable for a small specimen. Furthermore, since the hydraulic actuator has the principle of amplifying the load using oil as a medium, there is a limit to downsizing that can be performed on-site.

  The object of the present invention is to solve the above-mentioned problems of the prior art, and can apply a sufficient load to a smaller specimen sampled in an actual machine structure, and at the site where the specimen was sampled. To provide a small-sized material testing apparatus and a material testing method capable of testing.

  The small material testing apparatus according to the invention of claim 1 is a fixed chuck for fixing and supporting one end side of a specimen, a movable chuck for supporting the other end side of the specimen and applying a load to the specimen, A tension-compression super magnetostrictive actuator that moves the movable chuck so that the direction in which the load is applied to the specimen and the direction in which the load is applied coincide with each other, and the operating shaft of the super-compression magnetostrictive actuator for rotation is rotated. A torsional giant magnetostrictive actuator, a load torque sensor for detecting a tensile compression load and a torsion torque loaded on the specimen, a non-contact displacement meter for detecting a tensile compression displacement and a rotational displacement of the movable chuck, Tensile compression load and torsion torque of the specimen detected by a load torque sensor, or tensile compression of the movable chuck detected by the non-contact displacement meter Position and is characterized in that a control device for controlling the ultrasonic magnetostrictive actuator super magnetostrictive actuator and the twisting on the basis of the rotational displacement.

  In the small material testing apparatus according to the first aspect of the present invention, one end of the specimen is supported by a fixed chuck and the other end is supported by a movable chuck, and the specimen is stretched in the direction of tension and compression by a giant magnetostrictive actuator for tension and compression. A load is applied, and a torsional load is applied to the specimen by a torsional magnetostrictive actuator. Based on the tensile and compressive load and torsion torque of the specimen detected by the load torque sensor, or the tensile and compressive displacement and rotational displacement of the movable chuck detected by the non-contact displacement meter, the control device can detect the giant magnetostrictive actuator and the torsional Control the magnetostrictive actuator. As a result, the size can be reduced and a large load can be applied to the specimen.

  According to a second aspect of the present invention, there is provided the small material testing apparatus according to the first aspect of the invention, wherein the distance between the fixed chuck and the movable chuck on which the specimen is arranged is adjusted and the fixed chuck is fixed after the distance is adjusted. A chuck position adjusting jig for holding is provided.

  In the small material testing apparatus according to the second aspect of the invention, when the specimen is disposed between the fixed chuck and the movable chuck, the chuck position adjusting jig is moved so that the distance between the fixed chuck and the movable chuck is large. Adjust. Then, after the interval is adjusted, the fixed chuck is fixedly held. Thereby, when arrange | positioning a test body between a fixed chuck | zipper and a movable chuck | zipper, it can attach without generating an extra load.

  A small material test apparatus according to a third aspect of the present invention is the transmission material jig according to the first aspect, wherein a plurality of torsional giant magnetostrictive actuators are installed and the operating shaft of the tensile and compressive giant magnetostrictive actuator is rotated. A force is applied from a plurality of torsional magnetostrictive actuators.

In the small material testing apparatus according to the invention of claim 3, a force is applied from a plurality of twisting giant magnetostrictive actuators to a transmission jig for rotating the operating shaft of the tensile and compressing giant magnetostrictive actuator. Thereby, the torsional load can be applied smoothly. The small material testing apparatus according to the invention of claim 4 is the invention of claim 1, wherein the working shaft is provided at both ends of the working shaft of the tensile and compressing giant magnetostrictive actuator. A guide tube is provided.

  In the small material testing apparatus according to the fourth aspect of the present invention, the operating shaft of the tensile and compressive giant magnetostrictive actuator moves while being guided by the guide tube. Therefore, it is possible to prevent a bending load from being applied to the specimen to which a tensile and compressive load is applied by the operating shaft of the giant magnetostrictive actuator for tension and compression.

  According to a fifth aspect of the present invention, there is provided the small material testing apparatus according to the first aspect of the present invention, wherein a load torque sensor for detecting a tensile compression load and a torsion torque loaded on the specimen is provided on the fixed chuck. The tensile compressive load and the torsion torque applied to the specimen are detected by the applied tensile compressive load and the torsion torque.

  In the small material testing apparatus according to the fifth aspect of the present invention, the load torque sensor detects the tensile compression load and the torsion torque applied to the fixed chuck as the tensile compression load and the torsion torque applied to the specimen.

  According to a sixth aspect of the present invention, there is provided the small material test apparatus according to the first aspect of the present invention, wherein a non-contact displacement meter for detecting a tensile compression displacement and a rotational displacement of the movable chuck is provided in the vicinity of the movable chuck. The movement of the movable chuck detects a tensile compression displacement and a rotational displacement of the movable chuck.

  In the small material testing apparatus according to the sixth aspect of the present invention, the non-contact displacement meter detects the tension / compression displacement and the rotational displacement of the movable chuck by the movement of the movable chuck.

  According to a seventh aspect of the present invention, there is provided the small material testing apparatus according to the first aspect of the present invention, wherein the control device is configured so that the tensile compression load detected by the load torque sensor becomes a set tensile compression load. A tension compression control system for controlling the magnetostrictive actuator, and a twist control system for controlling the super magnetostrictive actuator for twisting so that the twist torque detected by the load torque sensor becomes a set twist torque. .

  In the small material testing apparatus according to the invention of claim 7, the tension / compression control system of the control device controls the giant magnetostrictive actuator for tension / compression so that the tension / compression load detected by the load torque sensor becomes the set tension / compression load. The twist control system controls the giant magnetostrictive actuator for twisting so that the twisting torque detected by the load torque sensor becomes the set twisting torque.

  According to an eighth aspect of the present invention, there is provided the small material testing apparatus according to the seventh aspect of the present invention, wherein the tension / compression control system of the control device is configured to pull the load torque sensor based on a tensile / compressive load detected by the load torque sensor. The compression displacement is obtained, the tensile compression displacement of the specimen is obtained from the difference from the tensile compression displacement of the movable chuck detected by the non-contact displacement meter, and the obtained tensile compression displacement of the specimen becomes the set tensile compression displacement. The tension-compression giant magnetostrictive actuator is controlled as described above.

  In the small material testing apparatus according to the eighth aspect of the invention, the tension / compression control system of the control device obtains the tension / compression displacement of the load torque sensor based on the tension / compression load detected by the load torque sensor. Then, the tensile and compressive displacement of the specimen is obtained from the difference between the tensile and compressive displacement of the movable chuck detected by the noncontact displacement meter and the tensile and compressive displacement of the load torque sensor. The tension and compression giant magnetostrictive actuator is controlled so that

  According to a ninth aspect of the present invention, there is provided the small material testing apparatus according to the seventh aspect of the present invention, wherein the torsion control system of the control device determines the rotational displacement of the load torque sensor based on the torsion torque detected by the load torque sensor. The rotational displacement of the specimen is obtained from the difference from the rotational displacement of the movable chuck detected by the non-contact displacement meter, and the torsional superposition is performed so that the obtained rotational displacement of the specimen becomes the set rotational displacement. The magnetostrictive actuator is controlled.

In the small material testing apparatus according to the invention of claim 9,
The twist control system of the control device obtains the rotational displacement of the load torque sensor based on the twist torque detected by the load torque sensor. Then, the rotational displacement of the specimen is obtained from the difference between the rotational displacement of the movable chuck detected by the non-contact displacement meter and the rotational displacement of the load torque sensor, and twisted so that the obtained rotational displacement of the specimen becomes the set rotational displacement. Control the giant magnetostrictive actuator.

  According to a tenth aspect of the present invention, there is provided a small material testing apparatus according to the first aspect of the present invention, wherein the rotation detecting the rotational displacement applied to the end of the operating shaft of the tensile and compressive giant magnetostrictive actuator by the twisted giant magnetostrictive actuator. A displacement sensor is provided, and the control device obtains the rotational displacement of the load torque sensor based on the torsional torque detected by the load torque sensor, and operates the tensile and compression giant magnetostrictive actuator detected by the rotational displacement sensor. The rotational displacement of the specimen is obtained from the difference from the rotational displacement of the shaft, and the torsional giant magnetostrictive actuator is controlled so that the obtained rotational displacement of the specimen becomes the set rotational displacement.

  In the small material testing apparatus according to the invention of claim 10, the control device obtains the rotational displacement of the load torque sensor based on the torsion torque detected by the load torque sensor. Then, the rotational displacement of the specimen is obtained from the difference between the rotational displacement of the operating shaft of the tensile and compression giant magnetostrictive actuator detected by the rotational displacement sensor and the rotational displacement of the load torque sensor, and the rotational displacement of the specimen to be obtained is set rotation. The torsional giant magnetostrictive actuator is controlled so as to be displaced.

  A small material test apparatus according to an invention of claim 11 surrounds a space portion extending between the fixed chuck and the movable chuck for holding the specimen in any of the inventions of claims 1 to 10. A thermostatic bath is provided.

  In the small material testing method according to the eleventh aspect of the invention, the thermostatic chamber surrounds a space extending between the fixed chuck and the movable chuck for gripping the specimen. Thereby, the test which changed the temperature and surrounding atmosphere of the specimen can be performed.

  The material testing method according to the invention of claim 12 is a method of fixing and supporting one end side of the specimen, applying a load to the specimen while supporting the other end side of the specimen, and applying a load to the specimen. Tension compression is applied so that the tensile compression direction when a load is applied and rotational torsion is applied, and tensile compression load and twist torque applied to the specimen are detected, and tensile compression displacement and rotational displacement are detected. The direction of applying a load to the specimen and the tension compression and the rotational torsion when the load is applied are controlled based on the tensile compression load and torsional torque or tensile compression displacement and rotational displacement of the specimen.

  According to the present invention, not only tensile compression but also torsional torque can be applied to a smaller specimen collected from an actual machine structure, so that it can be tested with higher accuracy than before. In addition, because of the miniaturization, the test can be performed at the site where the specimen was collected.

  Embodiments of the present invention will be described below. FIG. 1 is an external configuration diagram of a small material testing apparatus according to a first embodiment of the present invention. In FIG. 1, a tension / compression super magnetostrictive actuator 2 is mounted on a horizontal base 6 of a small material testing apparatus 1, and one end of the tension / compression super magnetostrictive actuator 2 is held by a vertical base 7. The operating axis of the tension and compression giant magnetostrictive actuator 2 passes through the vertical base 7, and a twisting giant magnetostrictive actuator 13 is provided on the back surface of the vertical base 7. The torsional giant magnetostrictive actuator 13 twists and rotates the operating shaft of the tensile and compressive giant magnetostrictive actuator 2, and is coupled with a structure such as a pinion and a rack, for example, and a torsion torque load is applied to the tensile and compressive giant magnetostrictive actuator. 2 to the operating axis.

  A movable chuck 5 is located at the other end of the giant magnetostrictive actuator 2, and a fixed chuck 4 is disposed facing the movable chuck 5. The specimen 3 is held between the fixed chuck 4 and the movable chuck 5, and the movable chuck 5 is moved by the tension and compression operation of the tension and compression giant magnetostrictive actuator 2 to apply a tensile and compressive load to the specimen 3 and twist. A torsional torque load is applied to the specimen 3 by the torsional rotation of the super magnetostrictive actuator 13.

  The fixed chuck 4 is held by a chuck position adjusting jig 8 via a load torque sensor 11. The chuck position adjusting jig 8 is attached to the base 6 via a support column 9. The chuck position adjusting jig 8 is movable in the direction of tensile and compressive load along the support column 9 in order to facilitate the arrangement of the specimen 3, and after the specimen 3 is arranged, it is firmly fixed by the stopper 10. It can be fixed to.

  Thus, since the chuck position adjusting jig 8 is movable in the load direction, it is attached without generating an extra load when the specimen 3 is disposed between the fixed chuck 4 and the movable chuck 5. be able to. Then, after the specimen 3 is arranged, the test can be started by firmly fixing the chuck position adjusting jig 8.

  The tension / compression super magnetostrictive actuator 2 utilizes the super strain effect, and is configured by winding an excitation coil around a super magnetostrictive material. Power is supplied to the excitation coil, the super magnetostrictive material is expanded and contracted by the magnetic field generated by the excitation coil, and the movable chuck 5 is moved by the expansion and contraction of the super magnetostrictive material. Similarly, the torsional magnetostrictive actuator 13 also uses the superstrain effect. The supermagnetostrictive material is expanded and contracted by the magnetic field generated by the excitation coil, and the rotational force is applied to the operating shaft of the tension and compression supermagnetostrictive actuator 2. give. The tensile and compressive giant magnetostrictive actuator 2 and the torsional giant magnetostrictive actuator 2 are controlled by a control device which will be described later, which is not shown in FIG.

  The tensile and compressive giant magnetostrictive actuator 2 and the torsional giant magnetostrictive actuator 13 utilize the superdistortion effect, and therefore can control a minute displacement with high accuracy, a higher output than the piezoelectric element, and a higher frequency than the piezoelectric element. It has the features that it operates with a small power supply and other incidental facilities. As described above, the tensile and compressive giant magnetostrictive actuator 2 and the twisted giant magnetostrictive actuator 13 have characteristics that the strain amount and the generated stress are very large and the response time is very fast compared to the piezoelectric element or the like. .

  Therefore, by using the giant magnetostrictive actuator as a load driving source of a small material testing apparatus, it is possible to generate a small displacement with high accuracy with respect to the small specimen 3, and it is small enough to carry the entire material testing apparatus. Can be a thing.

  The load torque sensor 11 attached to the fixed chuck 4 detects a tensile compression load and a torsion torque applied to the specimen 3, and the specimen 3 is detected by the tensile and compressive load and the torsion torque applied to the fixed chuck 4. The tension / compression load and torsion torque applied to the are detected. This load torque sensor 11 also uses the super strain effect. That is, since the change in expansion and contraction of the giant magnetostrictive material appears as a change in the magnetic field, the tensile and compressive load and the torsion torque are detected thereby.

  Further, in the vicinity of the movable chuck 5, a non-contact displacement meter 12 that detects a tensile compression displacement and a rotational displacement of the movable chuck 5 is provided. The non-contact displacement meter 12 is a non-contact displacement meter such as a laser displacement meter or an eddy current displacement meter, for example, and detects the tension / compression displacement and the rotational displacement of the movable chuck 5 by the movement of the movable chuck 5. That is, the movement of the movable chuck 5 and the rotational displacement are detected by detecting the movement of the protruding portion of the movable chuck 5 protruding in the direction perpendicular to the tensile and compressive load direction and measuring the change in position.

  The tensile compression load and torsion torque detected by the load torque sensor 11 and the movement amount and rotational displacement of the movable chuck 5 detected by the non-contact displacement meter 12 are input to a control device (not shown), and the tension compression actuator 2 and Used to control the torsion actuator 13.

  FIG. 2 is a block configuration diagram of the tension / compression control system of the control device 14. The tension / compression control system of the control device 14 is configured so that the tension / compression load detected by the load torque sensor 11 becomes a predetermined set tension / compression load, and the tension / compression displacement of the specimen 3 is set to a predetermined tension / compression displacement. Thus, the tension and compression giant magnetostrictive actuator 2 is controlled.

  The tensile and compressive load applied to the specimen 3 during the test is detected by the load torque sensor 11 provided in the main body of the small material test apparatus 1 and is input to the load detection unit 15 of the control device 14.

  When controlling the tensile and compressive load, the control calculation unit 16 inputs the tensile and compressive load applied to the specimen 3 from the load detection unit 15, and the tensile and compressive load applied to the input specimen 3 is input. Is controlled so as to be a preset tensile compression load. That is, the applied voltage of the tension / compression super magnetostrictive actuator 2 is controlled via the power supply device 17, and the control command is output to the tension / compression super magnetostrictive actuator 2 via the transmitter 18. As a result, the tensile and compression giant magnetostrictive actuator 2 applies a set tensile and compressive load to the specimen 3 and performs a load test.

  On the other hand, the tensile compression displacement amount in the tensile compression direction generated in the specimen 3 during the test is obtained from the difference between the displacement of the movable chuck 5 and the displacement generated in the load torque sensor 11 itself. This is because it is necessary to subtract the displacement of the load torque sensor 11 itself because the load torque sensor 11 itself uses the magnetostrictive effect to determine the amount of tensile and compressive displacement.

  The displacement of the movable chuck 5 under test is detected by the displacement detector 19 of the controller 14 as the output of the non-contact displacement meter 12 provided in the main body of the small material testing apparatus 1 and output to the difference calculator 20. .

  Further, the displacement generated in the load torque sensor 11 itself is input by the load detection unit 15 as the tensile / compressive load detected by the load torque sensor 11 provided in the main body of the small material test apparatus 1, and the load displacement conversion unit 21. It is obtained by converting the tensile and compressive load into a displacement amount. As shown in FIG. 3, the load displacement conversion unit 21 stores a correlation between the tensile compression load and the displacement amount of the load torque sensor 11 in advance, and the load displacement conversion unit 21 receives the input tensile compression load. Is output to the difference calculation unit 20 as a displacement amount.

  The difference calculation unit 20 calculates the difference between the displacement of the movable chuck 5 and the displacement generated in the load torque sensor 11 itself, and outputs the difference to the control calculation unit 16 as the amount of displacement generated in the specimen 3. When the control calculation unit 16 controls the tensile compression displacement in the tensile compression direction of the specimen 3, the amount of displacement generated in the specimen 3 calculated by the difference calculation unit 20 becomes a preset tensile compression displacement. Thus, the tension and compression giant magnetostrictive actuator 2 is controlled. That is, the applied voltage of the tension / compression super magnetostrictive actuator 2 is controlled via the power supply device 17, and the control command is output to the tension / compression super magnetostrictive actuator 2 via the transmitter 18. Thereby, a displacement test in which only the displacement of the specimen 3 is controlled can be performed.

  FIG. 4 is a configuration diagram of a twist control system of the control device 14. The torsion control system of the control device 14 is twisted so that the torsion torque detected by the load torque sensor 11 becomes a preset set torsion torque, and the rotational displacement of the specimen 3 becomes a preset set rotational displacement. The super magnetostrictive actuator 13 is controlled.

  The torque loaded on the specimen 3 during the test is detected by the load torque sensor 11 provided in the main body of the small material testing apparatus 1 and input to the torque detection unit 22 of the control device 14.

  When controlling the torsion torque, the control calculation unit 16 inputs the torsion torque applied to the specimen 3 from the torque detection unit 22, and the torsion torque applied to the input specimen 3 is determined in advance. The torsional giant magnetostrictive actuator 13 is controlled so that the set torsion torque is set. That is, the voltage applied to the torsional giant magnetostrictive actuator 13 is controlled via the power supply device 17, and the control command is output to the torsional giant magnetostrictive actuator 13 via the transmitter 18. As a result, the torsional giant magnetostrictive actuator 13 performs a torque test by generating a torsion torque on the specimen 3.

  On the other hand, the amount of rotational displacement in the torsional torque direction generated in the specimen 3 during the test is obtained from the difference between the displacement of the movable chuck 5 and the displacement generated in the load torque sensor 11 itself. This is because it is necessary to subtract the displacement of the load torque sensor 11 itself because the load torque sensor 11 itself uses the magnetostrictive effect to obtain the rotational displacement amount.

  The rotational displacement of the movable chuck 5 under test is detected by the rotational displacement detector 23 of the control device 14 as the output of the non-contact displacement meter 12 provided in the main body of the small material testing apparatus 1 and output to the difference calculator 20. Is done.

  In addition, the rotational displacement generated in the load torque sensor 11 itself is obtained by inputting the torsion torque detected by the load torque sensor 11 provided in the main body of the small material testing apparatus 1 by the load detection unit 15, and the torque rotation displacement conversion unit 24. Is obtained by converting the twisting torque into a rotational displacement amount. As shown in FIG. 5, the torque rotational displacement conversion unit 24 stores a correlation between the torque and the rotational displacement amount of the load torque sensor 11 in advance, and the torque rotational displacement conversion unit 24 receives the input twist torque. Is output to the difference calculation unit 20 as a rotational displacement amount.

  The difference calculation unit 20 calculates the difference between the rotational displacement of the movable chuck 5 and the rotational displacement generated in the load torque sensor 11 itself, and outputs the difference to the control calculation unit 16 as the rotational displacement amount generated in the specimen 3. When controlling the rotational displacement of the specimen 3 in the torsional torque direction, the control computation section 16 causes the rotational displacement generated in the specimen 3 calculated by the difference calculation section 20 to be a preset rotational displacement. The torsional giant magnetostrictive actuator 13 is controlled. That is, the voltage applied to the torsional giant magnetostrictive actuator 13 is controlled via the power supply device 17, and the control command is output to the torsional giant magnetostrictive actuator 13 via the transmitter 18. Thereby, a rotational displacement test in which only the rotational displacement of the specimen 3 is controlled can be performed.

  In the above description, the rotational displacement of the movable check 15 is detected by the non-contact displacement meter 12. However, a rotational displacement sensor is provided at the end of the tensile and compression giant magnetostrictive actuator 13, and the rotation detected by the rotational sensor. The displacement may be used as the rotational displacement of the movable check 15. An arrow 13s indicates a rotational displacement signal.

  A plurality of twisting giant magnetostrictive actuators 13 may be provided. FIG. 6 is an explanatory diagram of the transmission of torsional torque to the operating shaft of the tension and compression giant magnetostrictive actuator 2 when a plurality of twisted giant magnetostrictive actuators 13 are arranged. A force is applied from the plurality of twisting giant magnetostrictive actuators 13 to the transmission jig 25 for rotating the operating shaft 2a of the tensile and compressing giant magnetostrictive actuator. Thereby, rotation of the working shaft 2a can be made smooth. In FIG. 6, the twisting giant magnetostrictive actuator 13 is provided in opposition, but this is to eliminate play.

  Further, as shown in FIG. 7, guide tubes 26 for guiding the movement of the operating shaft 2a may be provided at both ends of the operating shaft 2a of the tensile and compressive giant magnetostrictive actuator 2. The guide tube 26 guides the working shaft 2a when the working shaft 2a of the tension / compression giant magnetostrictive actuator 2 moves, and prevents the working shaft 2a from being bent. The guide tube 26 is a material having lubricity, and minimizes the deflection of the operating shaft 2a.

  Next, a second embodiment of the present invention will be described. FIG. 8 is an external configuration diagram of a small material testing apparatus according to the second embodiment of the present invention. In the second embodiment, a space that extends between the fixed chuck 4 that holds the specimen 3 and the movable chuck 5 is surrounded by a thermostatic chamber 27 as compared with the first embodiment shown in FIG. It is what I did.

  The thermostat 27 incorporates a temperature control unit or a corrosive environment tank unit, and changes the atmosphere surrounded by the thermostat 27. As a result, tests can be performed under various temperature environments and corrosive environments.

The external appearance block diagram of the small material testing apparatus which concerns on the 1st Embodiment of this invention. The block block diagram of the tension compression control system of the control apparatus in the 1st Embodiment of this invention. The characteristic view of the correlation of the tension compression load of the load torque sensor in the 1st Embodiment of this invention, and the amount of tension compression displacement. The block block diagram of the twist control system of the control apparatus in the 1st Embodiment of this invention. The characteristic view of the correlation with the twist torque of the load torque sensor in the 1st Embodiment of this invention, and rotational displacement amount. Explanatory drawing of the torsion torque transmission to the operating shaft of the supercompression magnetostrictive actuator for tension compression at the time of arranging a plurality of supersonic magnetostriction actuators for twist in the 1st embodiment of the present invention. Explanatory drawing of the guide tube which guides the operating shaft of the giant magnetostrictive actuator for tension compression in the 1st Embodiment of this invention. The external appearance block diagram of the small material test apparatus which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Small material testing apparatus, 2 ... Giant magnetostrictive actuator for tension and compression, 3 ... Specimen, 4 ... Fixed chuck, 5 ... Movable chuck, 6 ... Horizontal base, 7 ... Vertical base, 8 ... Chuck position adjustment jig , 9 ... Support pillar, 10 ... Stopper, 11 ... Load torque sensor, 12 ... Non-contact displacement meter, 13 ... Giant magnetostrictive actuator,
DESCRIPTION OF SYMBOLS 14 ... Control apparatus, 15 ... Load detection part, 16 ... Control calculating part, 17 ... Power supply device, 18 ... Transmitter, 19 ... Displacement detection part, 20 ... Difference calculation part, 21 ... Load displacement conversion part, 22 ... Torque detection , 23 ... Rotational displacement detector, 24 ... Torque rotational displacement converter, 25 ... Transmission jig, 26 ... Guide tube, 27 ... Constant temperature bath

Claims (12)

A fixed chuck that fixes and supports one end of the specimen, a movable chuck that supports the other end of the specimen and applies a load to the specimen, and a direction and a load that apply the load to the specimen A tension-compressing giant magnetostrictive actuator that moves the movable chuck so that the tension and compression direction of the tension-compressing force coincides with each other, a twisting giant-magnetostrictive actuator for rotating an operating shaft of the tensile-compressing giant magnetostrictive actuator, and the specimen A load torque sensor that detects a tensile compression load and a torsion torque to be applied; a non-contact displacement meter that detects a tensile compression displacement and a rotational displacement of the movable chuck; and a tensile compression of the specimen detected by the load torque sensor. Based on the load and torsional torque or the tensile and compressive displacement and rotational displacement of the movable chuck detected by the non-contact displacement meter Small material testing apparatus characterized by comprising Chueta and a control device for controlling the twisting super magnetostrictive actuator. The chuck position adjusting jig for adjusting and fixing the interval between the fixed chuck and the movable chuck on which the specimen is arranged and fixing and holding the fixed chuck after adjusting the interval is provided. Small material testing equipment. A plurality of torsional giant magnetostrictive actuators are installed, and a force is applied from a plurality of torsional giant magnetostrictive actuators to a transmission jig for rotating an operating shaft of the tensile and compressive giant magnetostrictive actuator. The small material test apparatus according to 1. 2. The small material testing apparatus according to claim 1, wherein a guide tube for the working shaft is provided at both ends of the working shaft of the tensile and compression giant magnetostrictive actuator. A load torque sensor for detecting a tensile compressive load and a torsion torque applied to the specimen is provided with a tensile compressive load applied to the specimen by the tensile compressive load and the torsion torque applied to the fixed chuck. 2. The small material testing apparatus according to claim 1, wherein a torsion torque is detected. A non-contact displacement meter for detecting the tensile compression displacement and rotational displacement of the movable chuck is provided in the vicinity of the movable chuck, and detects the tensile compression displacement and rotational displacement of the movable chuck by the movement of the movable chuck. The small material testing apparatus according to claim 1. The control device includes a tension compression control system that controls the giant magnetostrictive actuator for tension compression so that a tensile compression load detected by the load torque sensor becomes a set tensile compression load, and a twist detected by the load torque sensor. 2. The small material testing apparatus according to claim 1, further comprising a torsion control system that controls the torsional giant magnetostrictive actuator so that the torque becomes a set torsion torque. The tension / compression control system of the control device obtains the tension / compression displacement of the load torque sensor based on the tension / compression load detected by the load torque sensor, and the tension / compression of the movable chuck detected by the non-contact displacement meter. The tensile and compressive displacement of the specimen is obtained from the difference from the displacement, and the tensile and compressive giant magnetostrictive actuator is controlled so that the obtained tensile and compressive displacement of the specimen becomes a set tensile and compressive displacement. 7. The small material testing apparatus according to 7. The twist control system of the control device obtains the rotational displacement of the load torque sensor based on the twist torque detected by the load torque sensor, and the difference from the rotational displacement of the movable chuck detected by the non-contact displacement meter. 8. The small material testing apparatus according to claim 7, wherein the rotational displacement of the specimen is obtained from the control and the giant magnetostrictive actuator for twisting is controlled so that the obtained rotational displacement of the specimen becomes a set rotational displacement. A rotational displacement sensor that detects a rotational displacement loaded by the torsional giant magnetostrictive actuator is provided at an end of the operating shaft of the tensile and compressive giant magnetostrictive actuator, and the control device detects the torsional torque detected by the load torque sensor. The rotational displacement of the load torque sensor is obtained based on the rotational displacement of the specimen, the rotational displacement of the specimen is obtained from the difference from the rotational displacement of the operating shaft of the tensile and compression giant magnetostrictive actuator detected by the rotational displacement sensor. 2. The small material testing apparatus according to claim 1, wherein the torsional giant magnetostrictive actuator is controlled so that the rotational displacement of the specimen becomes the set rotational displacement. 11. The small material according to claim 1, further comprising: a thermostatic chamber that surrounds a space that extends between the fixed chuck and the movable chuck that hold the specimen. Test equipment. One end side of the specimen is fixedly supported, while the other end side of the specimen is supported, a load is applied to the specimen, and the direction in which the load is applied to the specimen coincides with the direction of tension and compression when the load is applied. And compressing and applying a rotational torsion, detecting a tensile compression load and a torsion torque applied to the specimen, detecting a tensile compression displacement and a rotational displacement, and detecting a tensile compression load and a torsion torque of the specimen. A material testing method comprising controlling a direction of applying a load to the specimen and tensile compression and rotational torsion when the load is applied based on a tensile compression displacement and a rotational displacement.

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