JP2010156582A - Test tool, testing device and test method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve flexibility of an installation position of a test tool. <P>SOLUTION: A piston 16 is energized to the airtight chamber 20 side by a differential pressure between a sealed airtight chamber 20 and a pressure chamber 22, and the energizing force is transferred, to thereby apply a load to a test piece 24. Since the cylinder 14 inside is not opened to the atmosphere, a through-hole is not required in a pressure vessel 12, and the test tool 13 takes an independent form of the pressure vessel 12, to thereby improve flexibility of the quantity, the installation position or the size of the test tool 13 to be stored in the pressure vessel 12. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a test tool, a test apparatus, and a test method used for evaluating stress corrosion cracking (SCC) of a material.

  As a test apparatus used for evaluating stress corrosion cracking (SCC) of a material, a test apparatus disclosed in Patent Document 1 is known.

In the test apparatus of Patent Document 1, high-temperature and high-pressure water is passed outside the test piece 1 and the pressure boundary tube 7 with the cylinder 2 being horizontal. Since the piston 4 is sealed by the sealing O-ring 8, the high-temperature high-pressure water does not enter the pressure boundary introduction pipe 7. A load is applied to the test piece 1 by the pressure difference between the pressure of the test portion in the cylinder 2 and the atmospheric pressure in the pressure boundary pipe 7. The load stress of the test piece is determined by changing the cross-sectional area of the test piece. When the test piece 1 is broken, the piston rod 4a attached to the piston 4 pushes the ball 6, and the ball 6 falls in the pressure boundary tube 7. You can know when the piece broke.
JP 05-297181 A (FIG. 4)

  However, in the configuration of Patent Document 1, since the cylinder 2 is opened to the atmosphere, it is necessary to secure a passage for communicating the cylinder 2 and the atmosphere. For this reason, the cylinder 2 cannot be installed in a place where there is an obstacle to the atmosphere.

  Further, when the cylinder 2 is accommodated in the pressure vessel, it is necessary to form a through hole in the pressure vessel in order to secure a passage for communicating the cylinder 2 and the atmosphere. For this reason, the quantity, position and dimensions of the cylinders installed in the pressure vessel are limited by the quantity, position and dimensions in which the through holes are formed.

  In view of the above facts, an object of the present invention is to improve the degree of freedom of the installation position of the test device.

  The test device according to claim 1 of the present invention is provided with a cylinder in which a hermetically sealed airtight chamber is formed, and a reciprocating motion inside the cylinder, partitioning the airtight chamber from the outside, A piston capable of being biased toward the hermetic chamber by a pressure difference from the hermetic chamber and transmitting the biasing force to the sample to apply a load to the sample.

  According to this configuration, the piston can be urged toward the airtight chamber by the differential pressure between the outside and the airtight chamber, and a load can be applied to the sample.

  Here, in the configuration of claim 1 of the present invention, since the hermetic chamber is hermetically sealed, it is not necessary to secure a passage for communicating between the inside of the cylinder and the atmosphere. For this reason, the freedom degree of the installation position of a test tool can be improved compared with the structure by which the cylinder was open | released by air | atmosphere.

  According to a second aspect of the present invention, there is provided a test device according to the first aspect, further comprising opening / closing means provided on the cylinder or the piston and capable of opening the hermetic chamber.

  According to this configuration, since the hermetic chamber can be opened, the piston can be easily moved, and the sample can be easily connected to the piston.

  According to a third aspect of the present invention, there is provided the test apparatus according to the third aspect of the present invention, wherein the pressurized fluid is housed in a chamber, the pressure chamber in which the sample is disposed, and the internal pressure lower than the internal pressure of the pressure chamber. A cylinder in which an airtight chamber is formed is partitioned from the pressure chamber and the airtight chamber as the outside, and is biased toward the airtight chamber by the differential pressure between the pressure chamber and the airtight chamber. The test tool according to claim 1 or 2, comprising a piston for applying a load.

  According to this configuration, the piston is biased toward the hermetic chamber side by the differential pressure between the pressure chamber and the hermetic chamber, thereby applying a load to the sample.

  Here, in the configuration of claim 3 of the present invention, since the hermetic chamber is hermetically sealed, it is not necessary to secure a passage for communicating the inside of the cylinder and the atmosphere. For this reason, the freedom degree of the installation position of a test tool can be improved compared with the structure by which the cylinder was open | released by air | atmosphere.

  According to a fourth aspect of the present invention, in the configuration of the third aspect, the test apparatus is connected to the piston, maintains the hermetic state of the hermetic chamber, passes through the hermetic chamber, and is drawn out of the pressure chamber. And an actuator that is provided on the rod and applies a load to the sample through the rod and the piston.

  According to this configuration, in addition to the load on the sample due to the differential pressure between the pressure chamber and the airtight chamber, the load can be applied to the sample through the rod by the actuator. For this reason, the load given to a sample can be expanded.

  A test method according to claim 5 of the present invention is a test method using the test apparatus according to claim 3, wherein the pressurized fluid in the pressure chamber is raised to a target temperature, and after the rise, Increase internal pressure to target pressure.

  According to this configuration, first, the pressurized fluid in the pressure chamber is raised to the target temperature. As the temperature of the pressurized fluid in the pressure chamber rises, the temperature in the hermetic chamber also rises, so the internal pressure in the hermetic chamber rises. This reduces the load applied to the sample.

  Next, the internal pressure in the pressure chamber is raised to the target pressure. This increases the load applied to the sample.

  Here, in the configuration in which the pressurized fluid in the pressure chamber is raised to the target temperature after raising the internal pressure in the pressure chamber to the target pressure, the load applied to the sample when the internal pressure in the pressure chamber is raised to the target pressure is increased. The maximum load is reached, and the final load applied to the sample is less than the maximum load.

  On the other hand, in the configuration of claim 5 of the present invention, the internal pressure in the pressure chamber is raised to the target pressure after raising the pressurized fluid in the pressure chamber to the target temperature. There is no difference from the final load applied to the sample, or the configuration is smaller than the configuration in which the pressurized fluid in the pressure chamber is raised to the target temperature after the internal pressure in the pressure chamber is raised to the target pressure.

  Since this invention was set as the said structure, the freedom degree of the installation position of a test device can be improved.

Below, an example of an embodiment concerning the present invention is described based on a drawing.
(Configuration of test apparatus according to this embodiment)
First, the configuration of the test apparatus according to the present embodiment will be described. FIG. 1 is a schematic diagram illustrating the overall configuration of a test apparatus according to the present embodiment. FIG. 2 is a schematic diagram illustrating the configuration of the pressure vessel and the test device according to the present embodiment.

  As shown in FIGS. 1 and 2, the test apparatus 10 according to the present embodiment includes a pressure vessel (autoclave) 12 in which pressurized pressurized fluid is accommodated. As shown in FIG. 2, the pressure vessel 12 includes a pressure vessel main body 12A having an open portion 12C that opens the inside, and a lid member 12B that can open and close the open portion 12C.

  In the present embodiment, high-pressure and high-pressure (for example, 300 ° C., 7 to 10 MPa) pure water is accommodated in the pressure vessel 12 as the pressurized fluid. The pressurized fluid stored in the pressure vessel 12 is not limited to pure water, and may be other liquids or gas (gas).

  As shown in FIG. 1, the test apparatus 10 includes a circulation path 38 for circulating the pure water in the pressure vessel 12 to keep the water quality constant. In the circulation path 38, a cooler 40, an ion exchange resin 36, a water quality adjustment tank 42, a low pressure pump 44, a high pressure pump 46, and a heater 48 are provided in order from the upstream side to the downstream side.

  The pure water discharged from the pressure vessel 12 is cooled by the cooling water in the cooler 40, the ion concentration is adjusted by the ion exchange resin 36, and the concentration of dissolved gas such as oxygen is adjusted by the water quality adjustment tank 42. Further, the pure water whose gas concentration is adjusted is pressurized stepwise by the low pressure pump 44 and the high pressure pump 46, heated by the heater 48, and returned to the pressure vessel 12 again.

  In addition, the test apparatus 10 may be comprised with the autoclave which is not provided with the above circulation mechanisms.

  As shown in FIG. 2, a test device 13 including a cylinder 14 formed in a cylindrical shape and a piston 16 provided in the cylinder 14 so as to be able to reciprocate is provided inside the pressure vessel 12. . In addition, the shape of the cylinder 14 is not limited to a cylindrical shape, and may be a rectangular tube shape in which a circular hole having a circular cross section is formed at the center of the square column so as not to roll. The test device 13 is placed in the pressure vessel main body 12 </ b> A, and the lid member 12 </ b> B is closed on the pressure vessel main body 12 </ b> A and is accommodated in the pressure vessel 12.

  For example, the test tool 13 is placed on a shelf (not shown) provided in the pressure vessel main body 12A so that the axial direction (longitudinal direction) is along the horizontal direction (horizontal direction). The direction in which the test device 13 is placed on the shelf can be any direction. Moreover, the test tool 13 accommodated in the pressure vessel 12 may be single or plural. Further, the test device 13 may be configured to be attached to an attachment portion provided in the pressure vessel main body 12A, or may be fixed in the pressure vessel main body 12A by a fixing portion provided in the pressure vessel main body 12A. good.

  The inside of the cylinder 14 of the test device 13 is divided into two chambers by a piston 16. The two chambers are a communication chamber 18 that communicates with the outside of the cylinder 14 (inside the pressure vessel 12) and an airtight chamber 20 that is blocked without communicating with the outside of the cylinder 14 (inside the pressure vessel 12). ing.

  The communication chamber 18 communicates with the inside of the pressure vessel 12 through an opening 23 formed in the cylinder 14, and the pressurized fluid accommodated in the pressure vessel 12 flows into the communication chamber 18, and also inside the communication chamber 18. Pressurized pressurized fluid is contained. As a result, a pressure chamber 22 in which a pressurized fluid is accommodated is formed in the pressure vessel 12 around the communication chamber 18 and the test device 13.

  In the communication chamber 18 of the cylinder 14, a rod-shaped test piece 24 as an example of a sample is disposed. As the test piece 24, for example, a highly corrosion-resistant metal material such as stainless steel or Ni-based alloy is used. In addition, as the test piece 24, you may use metal materials with low corrosion resistance, and nonmetallic materials, such as ceramics and a plastic.

  One end portion (upper end portion in FIG. 2) of the test piece 24 is fixed to a fixing portion 26 provided at one end portion (upper end portion in FIG. 2) of the cylinder 14. Specifically, the screw portion 25 formed at one end portion of the test piece 24 is screwed into the screw hole 27 formed in the fixing portion 26, so that the one end portion of the test piece 24 is fixed to the fixing portion 26. ing.

  The other end (the lower end in FIG. 2) of the test piece 24 is fixed to the piston 16. Specifically, the other end portion of the test piece 24 is fixed to the piston 16 by screwing the screw portion 35 formed at the other end portion of the test piece 24 into the screw hole 37 formed in the piston 16. ing.

  For the method of fixing the test piece, an appropriate method can be selected depending on the shape of the test piece. For example, in the case of a test piece having an extension at the end, the extension is fixed by a U-shaped fixing part. be able to.

  In this way, the test piece 24 is directly connected (engaged) with the piston 16, and the moving force (biasing force) of the piston 16 is transmitted from the piston 16 to the test piece 24.

  The piston 16 is provided with an O-ring 28 for sealing the airtight chamber 20.

  The other end portion (lower end portion in FIG. 2) of the cylinder 14 is formed with a mouth portion 30 communicating with the inside and outside of the cylinder 14. A screw portion 32 is formed on the outer periphery of the mouth portion 30.

  Further, a cap 34 as an example of an opening / closing means capable of opening the hermetic chamber 20 is provided at the mouth portion 30 of the cylinder 14. The cap 34 is fixed to the screw portion 32 by screwing. As a result, the cylinder 14 is sealed, and a hermetically sealed airtight chamber 20 is formed. On the other hand, when the cap 34 is removed from the mouth portion 30, the hermetic chamber 20 is opened.

  Here, the hermetic chamber 20 has an internal pressure (for example, 0.1 MPa) lower than the internal pressure (for example, 7 to 10 MPa) of the pressure vessel 12. The airtight chamber 20 is a sealed space by closing the cap 34 at the mouth portion 30 of the cylinder 14 under an atmospheric pressure environment. Accordingly, air that is atmospheric pressure is sealed in the hermetic chamber 20. The hermetic chamber 20 may be configured to be sealed after the pressure is reduced to a pressure lower than the atmospheric pressure.

  The piston 16 is urged toward the airtight chamber 20 by the pressure difference between the pressure vessel 12 and the airtight chamber 20, and the urging force is transmitted to the test piece 24 to apply a load to the test piece 24. In the present embodiment, the test piece 24 is subjected to tensile stress.

  The load F applied to the test piece 24 is (Pa−Ps) * Sp when the internal pressure Pa of the pressure chamber 22, the internal pressure Ps of the airtight chamber 20, and the cross-sectional area Sp of the piston 16 are set.

  The test piece 24 in a state where a load is applied can be immersed in the pressure chamber 22 to examine the presence or absence of cracks. The immersion period may be a long period (for example, 500 to 7000 hours) or a short period. You may immerse continuously, you may repeat immersing intermittently, immersing, and observing.

  As shown in FIG. 3, a bolt 29 may be used as an example of opening / closing means that can open the hermetic chamber 20. Further, a bolt for opening the hermetic chamber such as 29 may be installed on the piston side. In this configuration, a screw hole 31 is formed at the other end (the lower end in FIG. 3) of the cylinder 14, and a bolt 29 is screwed and fixed to the screw hole 31.

  Moreover, in said embodiment, although the rod-shaped test piece 24 is used, various test pieces can be used. For example, as shown in FIGS. 4 and 5, a CT (Compact Tension) test piece 54 in which a cut is formed may be used.

  In this configuration, the test piece 54 is not directly attached to the piston 16 and the fixed portion 26 but is indirectly connected (engaged). That is, the fixing part 26 is provided with a fixing member 56 for fixing the test piece 54. The piston 16 is provided with a fixing member 58 for fixing the test piece 54 so that the moving force (biasing force) of the piston 16 is transmitted from the piston 16 to the test piece 54 via the fixing member 58. It has become.

  Each of the fixing member 56 and the fixing member 58 has a pair of side plates 56A and a pair of side plates 58A, and has a U-shape when viewed from the side. The test piece 54 is inserted between the pair of side plates 56A and the pair of side plates 58A, and one end and the other end thereof are fixed by a fixing pin 60 and a fixing pin 62 that pass through the pair of side plates 56A and the pair of side plates 58A. ing.

  In the above embodiment, tensile stress is applied to the test piece 24. However, the stress applied by the piston 16 to the test piece 24 is not limited to this, and may be bending, compression, twisting, or the like. . As an example of this, the configuration of a test tool for performing a bending test will be described later.

  In the above embodiment, a load is applied to the test piece 24 due to the differential pressure between the pressure vessel 12 and the hermetic chamber 20, but in addition to this, an actuator for applying a load to the test piece 24 is provided. May be. A configuration including an actuator that applies a load to the test piece 24 will be described later.

(Test method by the test apparatus 10 according to the present embodiment and the operational effects of the present embodiment)
Next, the test method by the test apparatus 10 according to the present embodiment and the effects of the present embodiment will be described.

  In the test method using the test apparatus 10, first, a test piece 24 is attached to the test tool 13. Next, the test tool 13 to which the test piece 24 is attached is placed in the pressure vessel main body 12 </ b> A, the lid member 12 </ b> B is closed, and the test tool 13 is accommodated in the pressure vessel 12.

  Next, the pressurized fluid is accommodated in the pressure vessel 12. Thereby, the internal pressure of the pressure chamber 22 becomes higher than the internal pressure of the airtight chamber 20, and the piston 16 is biased toward the airtight chamber 20 by the pressure difference between the pressure chamber 22 and the airtight chamber 20, and this biasing force is reduced. The load is applied to the test piece 24 by being transmitted.

  Here, as in Patent Document 1, if the airtight chamber 20 is not formed inside the cylinder 14 and the inside of the cylinder 14 is opened to the atmosphere, a through hole is formed in the pressure vessel 12, and the through hole is tested. It is necessary to attach the tool 13. For this reason, the quantity, position and dimensions of the test tool 13 accommodated in the pressure vessel 12 are limited by the quantity, position and dimensions in which the through holes are formed.

  On the other hand, according to the test apparatus 10 and the test method thereof according to the present embodiment, the inside of the cylinder 14 is not opened to the atmosphere, so that a through hole is not required in the pressure vessel 12, and the test tool 13 is independent from the pressure vessel 12. Since it becomes a form, the quantity of the test tool 13 accommodated in the pressure vessel 12, the installation position, and the freedom degree of a dimension improve.

  Further, according to the test apparatus 10 and the test method thereof according to the present embodiment, even if the pressurized fluid in the pressure chamber 22 leaks from between the piston 16 and the cylinder 14, the hermetic chamber formed as a sealed space. 20 will flow into. For this reason, the pressurized fluid stored in the pressure chamber 22 is less likely to leak out of the apparatus as compared with the configuration in which the cylinder 14 is opened to the atmosphere.

  Further, in the configuration in which the cylinder 14 is opened to the atmosphere, the internal pressure of the cylinder 14 is constant. However, in the present embodiment, the cylinder 14 is a sealed space by the airtight chamber 20, so the cylinder 14 (airtight chamber 20). It is conceivable that the internal pressure increases. When the internal pressure of the hermetic chamber 20 increases, the load applied to the test piece 24 decreases.

  As a cause of the increase in the internal pressure of the hermetic chamber 20, for example, it is conceivable that the temperature inside the hermetic chamber 20 also increases in the process of increasing the temperature of the pressurized fluid. In the present embodiment, for example, the temperature is raised from a room temperature of 27 ° C. (300 K) to a test temperature of 327 ° C. (600 K). As a result, the internal pressure of the hermetic chamber 20 increases twice, for example, from 0.1 MPa to 0.2 MPa. However, compared to the internal pressure of 7 to 10 MPa in the pressure chamber 22, since 0.2 MPa is small, the decrease in the load applied to the test piece 24 is low. In this way, it is possible to suppress a decrease in the load applied to the test piece 24 according to the set test conditions (test temperature, internal pressure of the pressure chamber 22 and internal pressure of the airtight chamber 20).

  Further, the cause of the increase in the internal pressure of the hermetic chamber 20 may be, for example, a decrease in the volume of the hermetic chamber 20 accompanying the movement of the piston 16.

  However, since the deformation (strain) of the test piece 24 under load is within the elastic range or about 1-2%, the displacement of the piston 16 is small. The increase in the internal pressure of the hermetic chamber 20 due to the displacement of the piston 16 is considered to be smaller than the increase in the internal pressure of the hermetic chamber 20 due to a temperature increase, although it depends on the test conditions.

  Further, by setting the axial length of the airtight chamber of the piston 16 to be large, the rate of decrease in the volume of the airtight chamber 20 accompanying the movement of the piston 16, that is, the influence of the pressure increase in the airtight chamber can be reduced. For this reason, it becomes possible to suppress the fall of the load load to the test piece 24 small.

  As described above, it is possible to suppress the influence of the decrease in the load applied to the test piece 24 due to the increase in the internal pressure of the airtight chamber 20 due to the displacement of the piston 16 and the increase in the internal pressure of the airtight chamber 20 due to the temperature increase.

  Further, since a decrease in the load applied to the test piece 24 due to an increase in the internal pressure of the hermetic chamber 20 can be suppressed, the acting stress acting on the test piece 24 is almost constant, and the acting stress can be clearly calculated.

  When performing the test, a method may be used in which the pressurized fluid in the pressure chamber 22 is raised to the target temperature, and the internal pressure in the pressure chamber 22 is raised to the target pressure after the increase.

  According to this method, as the temperature of the pressurized fluid in the pressure chamber 22 rises, the temperature in the hermetic chamber 20 also rises, so that the internal pressure of the hermetic chamber 20 rises. As a result, the load applied to the test piece 24 is reduced.

  Next, the load applied to the test piece 24 increases by increasing the internal pressure in the pressure chamber 22 to the target pressure.

  Here, in the configuration in which the pressurized fluid in the pressure chamber 22 is raised to the target temperature after the internal pressure in the pressure chamber 22 is raised to the target pressure, the test is performed when the internal pressure in the pressure chamber 22 is raised to the target pressure. The load applied to the piece 24 becomes the maximum load, and the final load applied to the test piece 24 is smaller than the maximum load. This is because the load applied to the test piece 24 decreases due to the increase in the internal pressure of the hermetic chamber 20 accompanying the increase in the temperature of the pressurized fluid in the pressure chamber 22.

  On the other hand, when the internal pressure in the pressure chamber 22 is raised to the target pressure after the pressurized fluid in the pressure chamber 22 is raised to the target temperature, the maximum load applied to the test piece 24 and the test piece 24 are increased. Is less than the method of raising the internal pressure in the pressure chamber 22 to the target pressure and then raising the pressurized fluid in the pressure chamber 22 to the target temperature. .

(Configuration of test equipment for bending test)
Next, the configuration of a test tool for performing a bending test will be described.

  FIG. 6 is a front view of a test device for performing a bending test. FIG. 7 is a side view of a test device for performing a bending test. In addition, about the part same as the test device 13, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 6 and 7, the test tool 113 for performing the bending test has one end (the upper end in FIGS. 6 and 7) opened and the other end (the lower end in FIGS. 6 and 7). Is provided with a closed cylindrical cylinder 114.

  The cylinder 114 is formed with a pair of support portions 128 that support a support member 126 that supports the bending test piece 124. The pair of support portions 128 protrude from the open end portion of the cylinder 114 along the axial direction of the cylinder 114 (upward in FIGS. 6 and 7), and support the support member 126 at two points.

  The support member 126 is formed in a block shape. The support member 126 is provided with two pins 130 arranged along the radial direction of the cylinder 114 at an interval. Both ends of the bending test piece 124 are in contact with the two pins 130.

  The bending test piece 124 is formed in a bar shape having a rectangular parallelepiped shape. The longitudinal direction of the bending test piece 124 is arranged along the radial direction of the cylinder 114. A cut 124 </ b> A is formed on the opposed surface on the cylinder 114 side facing the support member 126 in the middle portion in the longitudinal direction of the bending test piece 124.

  On the other hand, the piston 16 is provided with a rod 136 extending from the piston 16 toward the bending test piece 124. The rod 136 extends from the open end of the cylinder 114 along the axial direction of the cylinder 114 (upward in FIGS. 6 and 7), like the support portion 128.

  A pressing member 138 for pressing the bending test piece 124 is provided at the distal end portion of the rod 136. The pressing member 138 is surrounded by four plates and is formed in a frame shape in a side view. In the side plate 138A facing the pressing member 138, a pin 132 penetrates on the back side of the bending test piece 124, and the pin 132 is fixed to the side plate 138A.

  Thereby, the pin 132 presses the longitudinal center part of the back side of the bending test piece 124 to the cylinder 114 side. At this time, the bending test piece 124 is supported by the pins 130 at both ends in the longitudinal direction facing the support member 126, so that bending stress is applied to the bending test piece 124.

  As described above, the test piece 124 is indirectly engaged with the piston 16, and the moving force (biasing force) of the piston 16 is transmitted from the piston 16 through the rod 136, the pressing member 138, and the pin 132. To communicate.

(Configuration of test equipment with an actuator that applies a load to the test piece)
Next, the configuration of a test apparatus including an actuator that applies a load to the test piece will be described. FIG. 8 is a schematic diagram showing an overall configuration of a test apparatus including an actuator that applies a load to a test piece. FIG. 9 is a schematic diagram illustrating the configuration of a test tool and a pressure vessel in a test apparatus including an actuator that applies a load to a test piece. In addition, about the part same as the test apparatus 10, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIGS. 8 and 9, the test apparatus 100 including an actuator that applies a load to the test piece 54 includes a pressure vessel (autoclave) 212 in which a pressurized fluid is contained. As shown in FIG. 9, the pressure vessel 212 includes a pressure vessel main body 212A having an open portion 212C that opens the inside, and a lid member 212B that can open and close the open portion 212C.

  In the present embodiment, high-pressure and high-pressure (for example, 300 ° C., 7 to 10 MPa) pure water is accommodated in the pressure vessel 212 as the pressurized fluid. The pressurized fluid stored in the pressure vessel 212 is not limited to pure water, and may be other liquids or gas (gas).

  As shown in FIG. 8, the test apparatus 100 includes a circulation path 38 for circulating pure water in the pressure vessel 212 to keep the water quality constant. In the circulation path 38, a cooler 40, an ion exchange resin 36, a water quality adjustment tank 42, a low pressure pump 44, a high pressure pump 46, and a heater 48 are provided in order from the upstream side to the downstream side.

  The pure water discharged from the pressure vessel 212 is cooled by the cooling water in the cooler 40, the ion concentration is adjusted by the ion exchange resin 36, and the gas concentration such as oxygen dissolved from the water quality adjustment tank 42 is adjusted. Further, the pure water whose gas concentration is adjusted is pressurized stepwise by the low pressure pump 44 and the high pressure pump 46, heated by the heater 48, and returned to the pressure vessel 212 again. In FIG. 8, a cylinder 214 described later is omitted.

  In addition, the test apparatus 100 may be comprised with the autoclave which is not provided with the above circulation mechanisms.

As shown in FIG. 9, a test tool 213 including a cylinder 214 formed in a cylindrical shape and a piston 216 provided in the cylinder 214 so as to be capable of reciprocating movement is provided inside the pressure vessel 212. . The test device 213 is placed in the pressure vessel main body 212 </ b> A, the lid member 212 </ b> B is closed on the pressure vessel main body 212 </ b> A, and is accommodated in the pressure vessel 212.
The test tool 213 accommodated in the pressure vessel 212 may be single or plural.

  The piston 216 of the test device 213 partitions an airtight chamber 220 formed inside the cylinder 214 and a pressure chamber 222 formed outside the cylinder 214. The hermetic chamber 220 is a sealed space that is shut off without communicating with the outside of the cylinder 214 (the inside of the pressure vessel 212).

  The pressure chamber 222 in which the pressurized fluid is accommodated is formed outside (around) the cylinder 214.

  In the pressure chamber 222 in the pressure vessel 212, as an example of a sample, a CT (Compact Tension) test piece 54 in which a cut is formed is disposed. As the test piece 54, for example, a highly corrosion-resistant metal material such as stainless steel or Ni-based alloy is used. As the test piece 54, a metal material having low corrosion resistance, or a non-metal material such as ceramics or plastic may be used.

  One end of the test piece 54 is supported by a support member 226 provided in the pressure vessel 212 (lid member 212B). The support member 226 includes a pair of support portions 228 extending from the lid member 212 </ b> B along the axial direction of the cylinder 214 (upward in FIG. 8), and a support body 230 that is stretched over the distal ends of the pair of support portions 228. And a fixing member 256 attached to the support 230.

  The piston 216 is provided with a fixing member 258 for fixing the test piece 54 via the rod 254, and the moving force (biasing force) of the piston 216 is transferred from the piston 216 to the test piece via the fixing member 258. 54 is transmitted.

  Each of the fixing member 256 and the fixing member 258 has a pair of side plates 256A and a pair of side plates 258A, and has a U-shape in a side view (see FIG. 5 and FIG. 9). Shows one side plate 256A, 258A). The test piece 54 is inserted between the pair of side plates 256A and the pair of side plates 258A, and one end and the other end thereof are fixed by a fixing pin 260 and a fixing pin 262 that pass through the pair of side plates 256A and the pair of side plates 258A. ing.

  The piston 216 is connected to a rod 270 that passes through the airtight chamber 220 while maintaining the airtight state of the airtight chamber 220 and is drawn out of the pressure chamber 222.

  The cylinder 214 is provided with an O-ring 272 for sealing between the rod 270 and the cylinder 214. The lid member 212B is provided with an O-ring 274 for sealing between the rod 270 and the pressure vessel 212 (lid member 212B). The piston 216 is provided with an O-ring 232 for sealing the piston 216 and the cylinder 214.

  As shown in FIG. 8, an actuator 280 that applies a load to the test piece 54 through the rod 270 and the piston 216 is provided at the tip of the rod 270. The actuator 280 applies a tensile load to the rod 270 using hydraulic pressure or electric force.

  Generally, the maximum load load on the sample depends on the capacity of the actuator, but in the test apparatus 100, the maximum load load on the sample is applied to the piston only by additionally installing the piston and the cylinder without modifying the actuator or the like. It can be increased by the differential pressure.

  The present invention is not limited to the above-described embodiment, and various modifications, changes, and improvements can be made.

FIG. 1 is a schematic diagram illustrating the overall configuration of a test apparatus according to the present embodiment. FIG. 2 is a schematic diagram illustrating the configuration of the pressure vessel and the test device according to the present embodiment. FIG. 3 is a schematic view showing another configuration of the pressure vessel and the test device according to the present embodiment. FIG. 4 is a front view showing a configuration of a test device when a CT test piece is used. FIG. 5 is a side view showing the configuration of the test device when a CT test piece is used. FIG. 6 is a front view of a test device for performing a bending test. FIG. 7 is a side view of a test device for performing a bending test. FIG. 8 is a schematic diagram showing an overall configuration of a test apparatus including an actuator that applies a load to a test piece. FIG. 9 is a schematic diagram illustrating the configuration of a test tool and a pressure vessel in a test apparatus including an actuator that applies a load to a test piece.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Test apparatus 13 Test tool 14 Cylinder 16 Piston 20 Airtight chamber 22 Pressure chamber 24 Test piece 29 Bolt 34 Cap 54 Test piece 100 Test device 113 Test tool 114 Cylinder 124 Test piece 213 Test tool 214 Cylinder 216 Piston 220 Airtight chamber 222 Pressure chamber 270 Rod 280 Actuator

Claims (5)

A cylinder in which a sealed airtight chamber is formed;
It is provided inside the cylinder so as to be able to reciprocate, partitions the hermetic chamber from the outside, and is biased toward the hermetic chamber by the pressure difference between the outer and the hermetic chamber, and the biasing force is transmitted to the sample to A piston capable of applying a load to the sample;
Test equipment with   The test device according to claim 1, further comprising opening / closing means provided on the cylinder or the piston and capable of opening the hermetic chamber. A pressure chamber in which a pressurized fluid is contained in a chamber, and a sample is disposed in the chamber;
A cylinder in which the airtight chamber having an internal pressure lower than the internal pressure of the pressure chamber is formed, and the pressure chamber and the airtight chamber as the outside are partitioned, and a differential pressure between the pressure chamber and the airtight chamber The test tool according to claim 1 or 2, further comprising: a piston that is biased toward the airtight chamber by the pressure applied to the sample.
Test equipment with A rod connected to the piston, penetrating the airtight chamber while maintaining an airtight state of the airtight chamber, and drawn out to the outside of the pressure chamber;
An actuator provided on the rod for applying a load to the sample through the rod and the piston;
The test apparatus according to claim 3, comprising: A test method using the test apparatus according to claim 3,
A test method in which the pressurized fluid in the pressure chamber is raised to a target temperature, and then the internal pressure in the pressure chamber is raised to the target pressure.

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