JPH0749405Y2 - Load test equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load-applying tester for applying a load to a test piece in a corrosive environment and performing tests such as crack propagation velocity measurement.

[0002]

2. Description of the Related Art A creep test device is known as a normal load applying test device. In the conventional load applying test device of this type, a load is applied to a metal test piece and the time change of elongation of the test piece due to the application of the load is measured. Since the elongation of the test piece varies depending on the temperature, a heating furnace is attached to the test piece to maintain the test piece at a constant temperature.

However, in such a conventional load-applied test apparatus, the use environment other than temperature cannot be changed, and the load-applied test assuming a severe use environment can be performed safely and without corrosion of the apparatus. There is a problem that it is not easy to carry out while suppressing. Here, the harsh use environment is, for example, a hydrogen sulfide aqueous solution environment, a seawater environment, or the like.

[0004]

The present invention has been made in view of the above-mentioned conventional technical problems, and the structure thereof is as follows.
It is as follows. According to the configuration of the invention of claim 1, the upper base 2 and the lower base 1 arranged at a predetermined interval, and the middle part as a fulcrum
A lever member 9 which is supported by A and is swingably disposed on the upper base 2 side, and a weight 15 is attached to one end thereof, and a lever member.
9 , an upper gripping jig 23 provided at the other end of 9 , a lower gripping jig 7 provided on the lower substrate 1 side, a test piece 30 mounted between the upper and lower gripping jigs 23 , 7 , and a test piece. a load detecting means 27 for detecting a load acting on 30, the elongation detecting device 31 attached to the test piece 30, a container 32, 92 for covering the liquid-tight at least load application testing portion of the test piece 30, the container
32 , 92 connected to the container 32, 92 for corrosive fluids.
A load-applying test device including a fluid supply device 34 that circulates and supplies the load detection means 27.
-28 and connected to the cover 28 to cover the inert gas
And an inert gas supply device 35 for supplying the inside of the device 28.
And a load application test device . Consideration of claim 2
The structure of the plan is that the upper base 2 and the lower base are arranged at a predetermined interval.
Support the base 1 and the middle part at the fulcrum A and swing to the side of the upper base 2.
It is movably arranged and has a weight 15 attached to one end.
The lever member 9 and an upper gripping member provided on the other end of the lever member 9
The tool 23, the lower holding jig 7 provided on the lower base 1 side,
A test piece 30 mounted between the lower grip jigs 23 and 7.
And a load detecting means for detecting a load acting on the test piece 30.
27, and elongation detection means 31 attached to the test piece 30,
Liquid-tightly cover at least the load-applied test portion of the test piece 30.
A container 92 and a container for connecting a corrosive fluid to the container 92.
And a fluid supply device 34 that circulates and supplies the fluid to the inside 92.
A load applying test device, wherein the test piece 30 is
The notch 30a of the piece 30 is filled with the elastic material 90, and the inner portion
A corrosive fluid flow path 91 is formed in the container and
92 are arranged on both sides of the test piece 30,
The inner space of the container 92 is connected by the flow passage 91.
And a load application test device.

[0005]

According to such a load applying test device, first,
Attach the test piece between the upper grip jig and the lower grip jig,
Liquid-tightly cover at least the load-applied test portion that causes stress concentration of the test piece in the container. Then, a corrosive fluid is circulated and supplied so as to prevent retention in the container. Since the corrosive fluid only circulates in the container, it is limited to local corrosion of the load-applying test device, and the overall corrosion is well suppressed.

At the start of the load application test, the support of the weight is released. As a result, the lever member swings around the fulcrum A as a fulcrum, so that the lower end portion is connected to the lower base via the lower holding jig and the tensile load is applied to the test piece connected to the lever member via the upper holding jig. Works. With the load acting on the test piece, the load detection value by the load detection means and the elongation detection value by the elongation detection means can be obtained. Then,
It is possible to quantitatively or qualitatively grasp the progress state such as elongation that occurs in a metal test piece that gradually corrodes with the passage of time when a constant load is applied to the test piece, and judge the suitability of the material. it can. For example, from the relationship between load and time,
It is possible to know the limit load value at which crack propagation does not occur. It is also possible to break the test piece and perform a fracture toughness test by applying a load.

According to the invention of claim 1, the load detection is performed.
The output means 27 is covered with a cover 28, and the cover 2
Supply the inert gas from the inert gas supply device 35 to the inside 8.
So that it can be circulated in the containers 32 and 92
The load detecting means 27 is affected by the corrosive fluid supplied.
To prevent corrosion. Further, the consideration of claim 2
According to the plan, the fluid is not circulated from the fluid supply device 34 into the container 92.
The corrosive fluid supplied to the test piece 30 is applied to both sides of the test piece 30.
It is supplied in the container 92 arranged respectively,
The cutout 30a of the test piece 30 is pierced so as to communicate with the space.
The flow path 91 in the inner part formed by filling the elastic material 90
Be done. This causes stress concentration due to the action of the load.
Effectively corrosive environment near the notch 30a of the test piece 30
It is possible to carry out a load-adding test fold while placing it.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show an embodiment of the present invention. In FIGS. 1 and 2, reference numeral 1 is a lower base, and the lower base 1 and the upper base 2 are opposed to each other with a predetermined gap, and the four corners are connected by four columns 3 that hold the gap. Has been done. A lower holding jig 7 including a lower holding member 5a and a lower jig 6 is provided at the center of the lower base 1 on the other end side. As shown in FIG. 2, the lower grip member 5a has a forked portion 5b at the upper end and a threaded portion 5c at the lower end, and the threaded portion 5c is arranged so as to engage with the adjusting device 5d on the lower base 1. By rotating the handle 5e of the adjusting device 5d in the forward and reverse directions, the lower grip member 5a can be screwed in or unscrewed via a screw and a gear device (not shown).
The lower jig 6 is coupled to the forked portion 5b by a pin 8.

On the other hand, on the upper base 2, the intermediate portion of the lever member 9 is swingably supported by a fulcrum A at the center portion on the other end side. The lever member 9 includes a first lever member 10 swingably supported on the upper base 2 by a fulcrum A, and a first lever member 1
The second lever member 12 has an intermediate portion connected to the lower side of one end portion of 0 by a connecting tool 11. A first stopper 13 regulates the upper limit position of one end of the first lever member 10. 14 is a second stopper which is screwed to the upper base 2,
The lower limit of the one end of the first lever member 10 can be regulated at an arbitrary position by rotating the handle 14a in the forward and reverse directions.

A weight 15 is attached to one end of the second lever member 12.
Is attached, and the counterweight 16 is attached to the other end of the first lever member 10. The weight 15 is actually attached to the second lever member 12 via a link 17, and a weight support device 18 is provided on the lower base 1 side so as to face the weight 15. The weight support device 18 is configured by a double-acting cylinder device 19, and the weight 15 can be supported from below by a support member 19b fixed to the tip of the piston rod 19a. The solenoid 71a of the electromagnetic valve 71 incorporated in the cylinder device 19 and connected to the hydraulic pressure source 70 as shown in FIG. 3 is connected to the computer 68 via the timer 20 and the relay 21.

The double-acting cylinder device 19 is shown in FIG.
Two cylinder units are provided as shown in FIG.
The check valve and the flow rate adjusting valve 7 are provided in (A) and 19 (B) respectively.
2a, 72b, 72c, and 72d, one of the solenoid valves 71 (A) and 71 (B) has the a position and the other has the b position. The pressure oil from the hydraulic pressure source 70 is supplied to the chamber to drive the piston rod 19a and the support member 19b upward, and the pressure oil from the hydraulic pressure source 70 is supplied to the upper chamber of the other cylinder device 19 to supply the piston rod 19a and the support member. The member 19b can be driven downward. In addition, the rising position of the support member 19b is set to one of the limit switches SW at different positions.
The solenoid valves 71 (A) and 71 (B) are switched and regulated by the detection signal. Then, based on the command from the computer 68, the relay 21 operates and the timer 20
Therefore, the entire load of the weight 15 can be applied to the lever member 9 for a predetermined time set by the above.

Further, at the other end of the first lever member 10, an upper gripping jig 23 which is swingable about a fulcrum B is vertically provided. The upper gripping jig 23 is connected to the upper mounting member 29 which is swingable by the fulcrum B, the upper member 24 which is connected to the upper mounting member 29 by a pin 58, and the upper member 24 which is connected by a pin 26. Upper jig 25. A load detecting means 27 such as a load cell is attached to the upper member 24, and the load detecting means 27 is covered with a cover 28 formed of a transparent material (for example, acrylic resin) so as to prevent corrosion.

A metal test piece 30 is attached to the pins 80 and 82 between the upper grip jig 23 and the lower grip jig 7, specifically between the upper jig 25 and the lower jig 6. It can be installed easily. This test piece 30 is for a fracture toughness test, and has a U-shaped recess 30b having a notch 30a in the middle thereof. As shown in FIG. 4, knife edges 30c and 30d are attached to the upper and lower walls of the recess 30b, and the elongation detecting means 3 composed of a clip gauge (other strain gauge) is provided between the knife edges 30c and 30d.
1 is attached. 30e and 30f are pins 80 and 82
Is a through hole for inserting.

A container 32 is provided for liquid-tightly covering at least a notch 30a portion of the test piece 30, which is a load-applied test portion on which stress is concentrated. The container 32 is formed of a transparent material such as an acrylic resin, and has a container body 32a and a container body 32a.
And a detachable lid member 32b. The container body 32a is fixed in a liquid-tight manner by inserting the lower jig 6 through a seal ring (not shown) and tightening it with an annular fastener 33, and the lid member 32b fixes the upper jig 25 to the outside of the figure. It is mounted so that it can be moved up and down through a seal ring.

A hydrogen sulfide solution supply device 34 and an inert gas supply device 35, which are fluid supply devices, are connected to the container body 32a. Hydrogen sulfide aqueous solution supply device 3
No. 4 is a first cylinder 36 that stores hydrogen sulfide gas, and an aqueous solution that easily absorbs hydrogen sulfide gas (for example, 0.5% CH ₃
COOH aqueous solution) tank 37 and pump 38
And a tank 40 that includes a valve 39 that guides the hydrogen sulfide gas from the first cylinder 36 to the tank 37.
A pipe 41 for connecting the pump 7 and the pump 38 and a pipe 42 for connecting the pump 38 and the upper part of the container 32 are provided. The lower portion of the container 32 and the tank 37 are connected by a pipe 44 having a filter 43. A heater 46 and a thermometer 47 are attached to the tank 37 in order to provide a function of changing the temperature of the stored aqueous solution.

Further, the inert gas supply device 35 is provided with a second cylinder 50 for storing Ar gas which is an inert gas,
The Ar gas of the second cylinder 50 can be supplied to the tank 37 via the pipe 55 provided with the three-way switching valve 51. By supplying the Ar gas of the second cylinder 50 to the tank 37, And the hydrogen sulfide aqueous solution in the container 32 via the three-way switching valve 45 to the pipe 44a.
After being discharged from the outside to the outside, the inside of the container 32 can be replaced with Ar gas. Each of the pipes 40, 41, 42, 44, 44a through which the hydrogen sulfide aqueous solution flows is made of a corrosion resistant material [for example, Teflon (registered trademark)].

On the other hand, the pipe 52 connected to the three-way switching valve 51 is connected to the cover 28 which covers the load detecting means 27. Reference numeral 53 is a pipe connected to the cover 28 via a valve 54. When supplying Ar gas from the second cylinder 50 into the cover 28, the valve 54 is opened to prompt the supply of Ar gas.

Further, the lead wires 60 and 62, one ends of which are connected to the load detecting means 27 and the elongation detecting means 31, are connected to a computer 68 via an amplifier 64 and an A / D converter 66, respectively, and as time passes. The accompanying changes in load and changes in elongation can be recorded or displayed externally.

Next, the operation will be described. First, the test piece 30 is attached between the upper jig 25 and the lower jig 6, the container body 32a is closed by the lid member 32b, and the container 32 covers the entire test piece 30. In addition, the tank 37 has a first cylinder 3
The hydrogen sulfide gas in 6 is appropriately supplied and the heater 46
A hydrogen sulfide aqueous solution having a predetermined concentration and temperature is stored by adjusting the temperature at. The pump 38 is driven to supply the hydrogen sulfide aqueous solution in the container 32 so as to prevent it from staying, and the three-way switching valve 51 is switched to switch the second cylinder 50.
The Ar gas from the above is supplied into the cover 28 to prevent the corrosion of the load detecting means 27 at the upper position of the load applying test device by the gas having poor reactivity as much as possible. When supplying the hydrogen sulfide aqueous solution to the container 32, the three-way switching valve 45 is switched to discharge the Ar gas remaining in the container 32 from the pipe 44a to the outside.

When the container 32 is filled with the hydrogen sulfide aqueous solution, the three-way switching valve 45 is switched, and then the hydrogen sulfide aqueous solution is caused to flow from the container 32 to the pipe 44. The hydrogen sulfide aqueous solution flowing out is passed through the filter 43 to the tank 3
Reflux to 7. In this way, the load application test is performed on the test piece 30 in the container 32 in which the severe atmospheric environment is set.

At the start of the load application test, the piston rod 19a and the support member 19b of the cylinder device 19 are driven downward, and the second stopper 14 is released to release the weight 1
Release 5's support. As a result, the lever member 9 is fulcrum A
Since it swings about the fulcrum, a tensile load acts on the test piece 30 whose lower end is connected to the lower base plate 1 via the lower gripping jig 7 and which is connected to the lever member 9 via the upper gripping jig 23. . The notch 30a of the test piece 30 which receives stress concentration due to the action of load gradually grows and expands, and the detected value of the load by the load detection means 27 and the detected value of extension by the elongation detection means 31 are input to the computer 68. With this input,
To determine the suitability of the material by quantitatively or qualitatively grasping the progress state of cracks occurring in the metal test piece 30 that gradually corrodes with the passage of time in the state where a constant load is applied to the test piece 30. You can For example, from the relationship between the load and the time, it is possible to know the limit load value at which the crack does not propagate. It is also possible to break the test piece 30 and perform a fracture toughness test by applying a load.

At the time of such a test, the weight supporting device 18
Is supported to support the weight 15 from the lower side, and the load acting on the test piece 30 is unloaded every predetermined time, it is possible to obtain a gradient of the elongation amount when the load is unloaded. Therefore, the crack growth rate can also be measured. The unloading compliance method for obtaining the ratio of this strain and stress is about 2
This is performed by periodically repeating the operation of unloading up to 0% and adding again. That is, the computer 68
The solenoid 71a of the one solenoid valve 71 is energized via the timer 20 and the relay 21 in response to a command from the motor 20 so that the piston rod 19a and the support member 19b of the double-acting cylinder device 19 are supplied with the pressure oil from the hydraulic source 70. The weight 15 is driven upward for a predetermined time to support the weight 15 from below. In addition, container 3
Since 2 is formed of a transparent material, the crack propagation state of the test piece 30 can be visually confirmed.

When the load application test for one test piece 30 is completed, the pump 38 is stopped to stop the supply of the hydrogen sulfide aqueous solution to the tank 37, and the three-way switching valves 45 and 51 are switched, so that the tank 37 is stopped. Second cylinder 50
Of the Ar 3 gas, and while driving the pump 38, the container 3
2 and the hydrogen sulfide aqueous solution in the tank 37 are discharged to the outside through the pipe 44a, and the inside of the container 32 is replaced with Ar gas. A
After stopping the supply of r gas, the test piece 30 is removed from the upper and lower holding jigs 23, 7. In addition, the pump 3 of the pipe 42
If a three-way switching valve is provided downstream of 8, the hydrogen sulfide aqueous solution in the tank 37 can be discharged to the outside from the pipe 42 without passing through the container 32. It is possible to mount a new test piece 30 in the container 37 and repeat the load application test according to the above procedure.

5 to 7 show a container having another structure.
The notch 30a of the test piece 30 has an outer portion filled with an elastic material 90 made of an elastomer or rubber to be liquid-tightly filled, and a corrosive fluid passage 91 is formed in an inner portion. Containers 92 are arranged on both sides of the test piece 30 in which the flow passages 91 are formed, and the inner spaces of the both containers 92 are formed into the flow passages 91
To communicate with each other. The container 92 is formed of a transparent material such as acrylic resin so as to form a cylindrical body having a bottom, and a sealing material 92a is fixed to the periphery of the opening as shown in FIG. The pair of containers 92 are pressed against the side surface of the test piece 30 by the pressing plates 93, 93, and tightened by the bolts and nuts 94 to be mounted in a liquid-tight manner. Then, the pipe 42 is connected to the upper portion of each container 92, and the pipe 44 is connected to the lower portion. Then,
By driving the pump 38, the hydrogen sulfide aqueous solution supply device 3
The hydrogen sulfide aqueous solution from No. 4 is supplied to the inside of each container 92, and the hydrogen sulfide aqueous solution filling both containers 92 is cut out 30
It flows into the flow path 91 formed in the inner part of a.

According to the test piece 30 to which the pair of containers 92 are attached, the load-applied test portion subjected to stress concentration is liquid-tightly covered by the container 92, and the flow passage 91 formed in the inner portion of the notch 30a is covered. Since the hydrogen sulfide aqueous solution flows in, it is possible to perform a load application test such as measuring a crack propagation rate in a corrosive environment. Notch that expands as the crack progresses 3
At the outer portion of 0a, the elastic member 90 is elastically deformed to maintain liquid tightness. It should be noted that the breakage of the test piece 30 is detected by the elongation detecting means 31 as an excessive amount of elongation is generated, or is detected as an excessive swing of the lever member 9 by a limit switch (not shown), and the cylinder device is used. If the piston rod 19a of 19 and the supporting member 19b are driven to rise to support the weight 15 from below, the driving of the pump 38 is stopped, and the supply of the aqueous hydrogen sulfide solution to the container 92 is stopped, It is also possible to perform a rupture test with almost no leakage of the hydrogen sulfide aqueous solution.

By the way, the hydrogen sulfide aqueous solution supply device 34
May supply a corrosive fluid and give a specific corrosion test environment to the container 32. For example, a high-temperature seawater supply device may be used to perform a load application test in a seawater atmosphere. Moreover, a load application test such as a creep test can be performed by using this load application test device.

[0027]

[Effect of the Invention] As can be understood from the above description,
According to the present invention, a load-applying test device capable of easily carrying out a load-applying test in which a specific corrosive environment condition is set is obtained by a simple structure, and corrosion of the load-applying test device is ensured while ensuring safety. It is possible to obtain the practical effect that the above can be suppressed to the minimum. That is, the invention of claim 1
According to the above, the above-mentioned load application test was performed to confirm that the load detection means has good corrosion.
It can be done with good prevention. In addition, in claim 2
According to the invention, the above load application test is performed by the action of load.
Effectively corrodes near the notch of a test piece that is subjected to stress concentration
Since it is placed in the environment, load is applied while ensuring safety.
Good effect of minimizing corrosion of the test equipment
Can be obtained.

[Brief description of drawings]

FIG. 1 is a front view showing a load applying test device according to an embodiment of the present invention.

FIG. 2 is a side view showing an enlarged main part of the same.

FIG. 3 is a side view showing the weight supporting device in section.

FIG. 4 is a side view showing the same test piece.

FIG. 5 is a side view showing a further enlarged test piece including a container having another structure.

FIG. 6 is a side view showing a test piece also having a push plate.

FIG. 7 is a sectional view showing a test piece to which a push plate is also attached.

[Explanation of symbols]

1: Lower base, 2: Upper base, 3: Support, 7: Lower grip jig, 9: Lever member, 15: Weight, 18: Weight support device,
23: Upper gripping jig, 27: Load detection means, 28: Cover, 30: Test piece, 30a: Notch, 31: Elongation detection means, 32, 92: Container, 34: Hydrogen sulfide aqueous solution supply device (fluid supply device ), 35: inert gas supply device, 37:
Tank, 38: pump, 46: heater, 47: thermometer,
80, 82: pins, A, B: fulcrum.

Claims (2)

[Scope of utility model registration request] 1. An upper substrate (2) arranged at a predetermined interval.
Also, the lower base (1) and the middle part are supported by the fulcrum (A) and are swingably arranged on the upper base (2) side, and the weight is attached to one end.
A lever member (9) to which (15) is attached, and a lever member
Between the upper grip jig (23) provided on the other end of (9) , the lower grip jig (7) provided on the lower base plate (1) side, and the upper and lower grip jigs (23, 7) Attached to the test piece (3
0), a load detecting means for detecting a load acting on the test piece (30) (27), elongation detecting means attached to the test piece (30) and (31), at least load application test of a test sample (30) A container (32, 92) for liquid- tightly covering the part, and a container
(32, 92) and connects the corrosive fluid to the container (3
2, 92) and a fluid supply device (3
4) shall apply in load application test device comprising a cover (28) covering the load detecting means (27), the cover
Is connected to (28) and the inert gas is introduced into the cover (28).
An inert gas supply device (35) for supplying the load-applied test device. 2. An upper substrate (2) arranged at a predetermined interval.
And support the lower base (1) and the middle part at the fulcrum (A)
It is arranged swingably on the upper base (2) side and has a weight on one end.
A lever member (9) to which (15) is attached, and a lever member
An upper grip jig (23) provided at the other end of (9) and a lower base.
The lower grip jig (7) provided on the board (1) side and the upper and lower grips
A test piece (3 attached between the jigs (23, 7)
0) and the load that detects the load acting on the test piece (30)
Detecting means (27) and elongation attached to the test piece (30)
At least the load of the detection means (31) and the test piece (30)
A container (92) for liquid-tightly covering the additional test portion, and a container (9)
2) is connected to circulate a corrosive fluid in the container (92)
Loaded with fluid supply device (34)
In the additional test apparatus , the test piece (30) is a cutout (30) of the test piece (30).
a) is filled with elastic material (90) and the inner part is corrosive flow
The body channel (91) is formed and the container (92) is formed.
Are placed on both sides of the test piece (30),
The internal space of the container (92) is communicated by the flow path (91).
And load application test and wherein the are.