A clamp for an indentation creep testing machine suitable for plate-shaped specimens

Abstract

The present invention provides a clamp for an in-press creep testing machine suitable for plate-like specimens, which is used to connect the creep testing machine and cooperate with an extensometer to test the precise deformation of the plate-like specimen. The clamp comprises: a connecting mechanism, which is used to connect the creep testing machine and comprises a first connecting member and a second connecting member; and a main body mechanism, which is connected to the connecting mechanism and comprises a first main body connected to the first connecting member and a second main body connected to the second connecting member. The first main body and the second main body are both rectangular with a through-notch in the middle. The first main body and the second main body are respectively nested with each other through the through-notch. The through-notch is used to place the plate-like specimen. When the plate-like specimen is placed in the through-notch, the first main body and the second main body respectively apply pressure toward the plate-like specimen from both sides.

Description

Technical Field

[0001] This invention relates to the field of mechanical property testing technology, and more specifically to a clamping fixture for an indentation creep testing machine suitable for plate-shaped specimens. Background Technology

[0002] Duration and creep specimens include two types: cylindrical specimens and plate specimens. Cylindrical specimens are mainly used for durability and creep tests when there is sufficient material and no requirements are made on the specimen size. The specimen and the fixture are usually connected by thread or suspension.

[0003] Plate-shaped specimens are primarily used for durability and creep testing of materials with limited dimensions or thin plates. For example, regarding safety issues during busbar operation, the contact points between the busbar conductors and the junction box are prone to aging. This can lead to abnormal temperature rise at the aging sites, or increased resistance due to poor contact at the joints, causing overheating, and in severe cases, the joints may even turn red-hot. Creep generated by the busbars during long-term operation is one of the main causes of abnormal temperature rise at the joints. To obtain data on the durability and creep performance of the busbars, the material needs to be processed into durability and creep specimens, and then tested using a durability and creep testing machine. During durability and creep testing, appropriate fixtures are required to fix the specimens on the creep testing machine.

[0004] However, existing indentation creep testing devices are mainly suitable for cylindrical specimens, and the fixtures are usually cumbersome to install and costly. In addition, the traditional pin connection for plate specimens is prone to problems such as specimen clamping end breakage, pin breakage, and pin deformation. Summary of the Invention

[0005] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a clamp for an indentation creep testing machine suitable for plate-shaped specimens.

[0006] This invention provides a creep testing machine fixture suitable for plate-shaped specimens, used to connect a creep testing machine and cooperate with an extensometer to test the precise deformation of the plate-shaped specimen. It features a connecting mechanism for connecting the creep testing machine, including a first connector and a second connector; and a main body mechanism connected to the connecting mechanism, including a first main body connected to the first connector and a second main body connected to the second connector. Both the first and second main bodies are rectangles with a through slot in the middle. The first and second main bodies are nested together through the through slot, which is used to place the plate-shaped specimen. When the plate-shaped specimen is placed into the through slot, the first and second main bodies apply pressure from both sides towards the plate-shaped specimen.

[0007] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following feature: the middle sections of the first connector and the second connector are provided with outwardly protruding bosses, which are used to clamp extensometers.

[0008] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following feature: one end of the first connector and the second connector are provided with an external thread structure that mates with the internal thread structure of the creep testing machine, so that the first connector and the second connector are respectively threadedly connected to the two creep testing machines.

[0009] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the first main body and the second main body each include two support members and two baffles, the baffles of the first main body are disposed on both sides of the support members along the first direction, and the baffles of the second main body are disposed on both sides of the support members along the second direction, the first direction being perpendicular to the second direction.

[0010] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following feature: both the support member and the baffle are provided with matching bolt holes, and the support member and the baffle are connected by passing the bolts through the bolt holes.

[0011] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the first main body includes a first support member and a second support member, the second support member is provided with a first groove 26 that mates with the plate-shaped specimen, the second main body includes a third support member and a fourth support member, the third support member is located between the first support member and the second support member, the second support member is located between the third support member and the fourth support member, and the plate-shaped specimen is disposed between the third support member and the second support member.

[0012] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the first connecting member is connected to the first support member, and the second connecting member is connected to the fourth support member.

[0013] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: the first main body includes a first baffle and a second baffle, the second main body includes a third baffle and a fourth baffle, the first baffle and the second baffle are respectively disposed on both sides of the first support member and the second support member along a first direction, the third baffle and the fourth baffle are respectively disposed on both sides of the third support member and the fourth support member along a second direction, and the plate-shaped specimen is disposed between the first baffle, the second baffle, the third baffle and the fourth baffle.

[0014] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following features: wherein the lengths of the first baffle and the second baffle in the second direction are the same as the lengths of the first support member and the second support member in the second direction; the lengths of the first baffle and the second baffle in the third direction are the same as the distance between the first support member and the second support member; the lengths of the third baffle and the fourth baffle in the first direction are the same as the lengths of the third support member and the fourth support member in the first direction; the lengths of the third baffle and the fourth baffle in the third direction are the same as the distance between the third support member and the fourth support member; the third direction is perpendicular to the first direction and the second direction, respectively; and the area of ​​the first baffle and the second baffle is greater than the area of ​​the third baffle and the fourth baffle.

[0015] The indentation creep testing machine fixture for plate-shaped specimens provided by the present invention may also have the following feature: wherein the materials of the connecting mechanism and the main body mechanism are equiaxed high-temperature alloys, directionally solidified high-temperature alloys, or single-crystal high-temperature alloys.

[0016] The role and effect of invention

[0017] According to the present invention, a clamping fixture for an indentation creep testing machine for plate-shaped specimens includes a connecting mechanism and a main body mechanism. It is well-suited for plate-shaped specimens and, by refining them into different parts, facilitates installation and reduces costs. The connection between the specimen and the clamping fixture of the present invention adopts a clamping end suspension method, and the clamping parts reduce stress concentration at the edge of the specimen. This overcomes the drawbacks of traditional pin connections for plate-shaped specimens, such as specimen clamping end breakage, pin breakage, and pin deformation, which are prone to occur. This reduces the probability of test failure and avoids problems such as inaccurate data and waste of resources. Attached Figure Description

[0018] Figure 1 This is an exploded view of the fixture in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the fixture assembly in an embodiment of the present invention;

[0020] Figure 3 This is a left view of the clamp in an embodiment of the present invention; and

[0021] Figure 4 This is a front view of the fixture in an embodiment of the present invention. Detailed Implementation

[0022] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0023] To make the technical means, creative features, objectives and effects of the present invention easy to understand, the following embodiments, in conjunction with the accompanying drawings, specifically illustrate the clamping fixture of the present invention applicable to the indentation creep testing machine for plate-shaped specimens.

[0024] Figure 1 This is an exploded view of the fixture in an embodiment of the present invention. Figure 2 This is a schematic diagram of the fixture assembly in an embodiment of the present invention. Figure 3 This is a left view of the clamp in an embodiment of the present invention. Figure 4 This is a front view of the fixture in an embodiment of the present invention.

[0025] Where x represents the first direction, y represents the second direction, and z represents the third direction.

[0026] like Figure 1-4 As shown, the indentation creep testing machine fixture 100 for plate-shaped specimens in this embodiment is used to connect the creep testing machine and cooperate with the extensometer to test the precise deformation of the plate-shaped specimen 40. It includes a connecting mechanism 10 and a main body mechanism. In applications with low operating temperatures, such as busbar trunking operating at 110℃~130℃, 45 steel is generally sufficient to meet strength requirements. In applications with higher temperature requirements, the connecting mechanism 10 and the main body mechanism can be made of equiaxed crystal high-temperature alloys, directionally solidified high-temperature alloys, and single-crystal high-temperature alloys, etc., capable of withstanding temperatures above 1000℃. Of course, other materials with higher temperature resistance and higher strength can also be selected.

[0027] The connecting mechanism 10 is used to connect the creep testing machine and includes a first connecting member 11 and a second connecting member 12. The middle sections of the first connecting member 11 and the second connecting member 12 are provided with outwardly protruding bosses 13, which are used to clamp extensometers.

[0028] The first connector 11 is connected to the first support 21, and the second connector 12 is connected to the fourth support 32. Specifically, the first connector 11 and the second connector 12 are respectively provided with a first external thread structure 14 at one end and a second external thread structure 15 at the other end. The boss 13 is disposed between the first external thread structure 14 and the second external thread structure 15.

[0029] The first external thread structure 14 mates with the internal thread structure of the creep testing machine, thereby enabling the first connector 11 and the second connector 12 to be threadedly connected to the two creep testing machines respectively.

[0030] The creep testing machine can apply tensile force to the fixture through the connecting mechanism 10. The extensometer can measure the displacement of the fixture after the creep testing machine applies the force. The displacement is used to calculate the deformation of the plate specimen 40, thereby conducting mechanical property tests on the plate specimen 40.

[0031] The main body is connected to the connecting mechanism 10, including a first main body part 20 connected to the first connecting member 11 and a second main body part 30 connected to the second connecting member 12.

[0032] The first main body 20 and the second main body 30 are both rectangles with a through slot in the middle, namely the first through slot 25 and the second through slot 36. The first main body 20 and the second main body 30 are nested together through the first through slot 25 and the second through slot 36 respectively. The through slot is used to place the plate-shaped sample 40. When the plate-shaped sample 40 is placed in the through slot, the first main body 20 and the second main body 30 are pulled outward from both sides toward the plate-shaped sample 40, thereby causing the plate-shaped sample 40 to deform.

[0033] The first main body 20 and the second main body 30 both include two support members and two baffles. The baffles of the first main body 20 are disposed on both sides of the support members along the first direction, and the baffles of the second main body 30 are disposed on both sides of the support members along the second direction. The first direction is perpendicular to the second direction.

[0034] The thickness of the support is greater than 50% of the thickness of the plate-shaped sample 40.

[0035] Both the support and the baffle are provided with matching bolt holes. The support and the baffle are connected by passing the bolts through the bolt holes.

[0036] The first main body 20 includes a first support member 21 and a second support member 22. The second support member 22 has a first groove 26 above it that mates with the plate-shaped sample 40 for engaging the plate-shaped sample 40. The second main body 30 includes a third support member and a fourth support member 32. The third support member 31 has a second groove 37 below it. The second groove 37 has a protrusion 35 inside it. The width of the protrusion 35 is greater than the width of the plate-shaped sample 40 and fits tightly against the plate-shaped sample 40. The third support member 31 is located between the first support member 21 and the second support member 22. The second support member 22 is located between the third support member 31 and the fourth support member 32. The plate-shaped sample 40 is disposed between the third support member 31 and the second support member 22.

[0037] The first support member 21 is provided with threaded holes 51 with internal thread structure above and the fourth support member 32 is provided with threaded holes 51 below. The second external thread structure 15 of the first connector 11 and the second connector 12 passes through the threaded holes 51 and is threadedly connected to the first support member 21 and the fourth support member 32, thereby realizing the connection between the connecting mechanism and the main body mechanism.

[0038] The first main body 20 includes a first baffle 23 and a second baffle 24, and the second main body 30 includes a third baffle 33 and a fourth baffle 34. The first baffle 23 and the second baffle 24 are respectively disposed on both sides of the first support member 21 and the second support member 22 along the first direction, and the third baffle 33 and the fourth baffle 34 are respectively disposed on both sides of the third support member 31 and the fourth support member 32 along the second direction. The plate-shaped sample 40 is disposed between the first baffle 23, the second baffle 24, the third baffle 33 and the fourth baffle 34.

[0039] The lengths of the first baffle 23 and the second baffle 24 in the second direction are the same as the lengths of the first support member 21 and the second support member 22 in the second direction. The lengths of the first baffle 23 and the second baffle 24 in the third direction are the same as the distance between the first support member 21 and the second support member 22. The lengths of the third baffle 33 and the fourth baffle 34 in the first direction are the same as the lengths of the third support member 31 and the fourth support member 32 in the first direction. The lengths of the third baffle 33 and the fourth baffle 34 in the third direction are the same as the distance between the third support member 31 and the fourth support member 32. The third direction is perpendicular to the first direction and the second direction, respectively. The area of ​​the first baffle 23 and the second baffle 24 is larger than the area of ​​the third baffle 33 and the fourth baffle 34.

[0040] Therefore, holes 50 are respectively opened on both sides of the first baffle 23 and the second baffle 24 in the third direction, and holes 50 are also respectively opened at both ends of the first support member 21 and the second support member 22 in the first direction. The holes 50 at the upper ends of the first baffle 23 and the second baffle 24 are respectively connected to the first support member 21 by bolts, and the holes 50 at the lower ends of the first baffle 23 and the second baffle 24 are respectively connected to the second support member 22 by bolts.

[0041] Holes 50 are also provided at the four corners of the third baffle 33 and the fourth baffle 34, and through holes 50 are also provided at both ends of the third support member 31 and the fourth support member 32. The third baffle 33, the fourth baffle 34, the third support member 31, and the fourth support member 32 are connected by bolts.

[0042] The specific usage method of the clamp 100 for the indentation creep testing machine suitable for plate-shaped specimens is as follows:

[0043] S1. The first support member 21 and the second support member 22 are connected by the first baffle 23 and the second baffle 24 to form the first main body part, and the sample is placed on the second support member 22.

[0044] S2. Place the three supports between the first support 21 and the sample, place the fourth support 32 below the second support 22, and connect the third support 31 and the fourth support 32 through the third baffle 33 and the fourth baffle 34 to form the second main body part. At this time, the sample is located between the third support 31 and the second support 22.

[0045] S3. Connect the two creep testing machines to the first connector 11 and the second connector 12 by thread, and apply tension to the fixture as a whole through the first connector 11 and the second connector 12.

[0046] S4. Connect the extensometer to the boss 13 to measure the displacement of the fixture and the deformation of the specimen, thereby conducting a mechanical property test.

[0047] The role and effect of the embodiments

[0048] According to the present invention, a clamping fixture for an indentation creep testing machine for plate-shaped specimens includes a connecting mechanism and a main body mechanism. It is well-suited for plate-shaped specimens and, by refining them into different parts, facilitates installation and reduces costs. The connection between the specimen and the clamping fixture of the present invention adopts a clamping end suspension method, and the clamping parts reduce stress concentration at the edge of the specimen. This overcomes the drawbacks of traditional pin connections for plate-shaped specimens, such as specimen clamping end breakage, pin breakage, and pin deformation, which are prone to occur. This reduces the probability of test failure and avoids problems such as inaccurate data and waste of resources.

[0049] This invention can be assembled using fixture parts of different specifications to meet different size requirements. The bolt connection ensures that the creep test load requirements can be met in most cases. By using bolts to fix the pad assembly and the plate specimen, the tightness of the nut can be adjusted to make the entire connection system achieve optimal coaxiality. This avoids the adverse effects on the test results caused by the inaccurate coaxiality of the plate specimen when using pin connection, and makes it easier for the entire connection system to achieve optimal coaxiality.

[0050] The structure of this invention is not only applicable to high-temperature creep and calorific value tests of plate specimens, but also to mechanical property tests of plate specimens at room temperature, high-temperature indentation creep, tensile fatigue, and compression fatigue.

[0051] In this invention, the areas of the third and fourth baffles are significantly larger than those of the first and second baffles, which can provide a more uniform force during the pressing process.

[0052] The present invention uses equiaxed crystal high-temperature alloys, directionally solidified high-temperature alloys or single crystal high-temperature alloys as the main materials, which can withstand high temperatures above 1000°C.

[0053] The present invention provides a first groove 26 above the second support member to facilitate the placement of the plate-shaped sample and prevent the plate-shaped sample from falling off during the experiment.

[0054] The present invention provides a second groove 37 below the third support member, and a protrusion 35 is provided in the second groove 37. The protrusion 35 can fit well with the plate-shaped sample, so that the plate-shaped sample and the third support member have a tighter contact.

[0055] Those skilled in the art should understand that this invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to this invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A clamping fixture for an indentation creep testing machine suitable for plate-shaped specimens, used to connect a creep testing machine and cooperate with an extensometer to test the precise deformation of the plate-shaped specimens, characterized in that, include: A connecting mechanism for connecting the creep testing machine includes a first connector and a second connector; as well as The main body, connected to the connecting mechanism, includes a first main body connected to a first connecting member and a second main body connected to a second connecting member. Both the first and second main bodies are rectangles with a through slot in the middle. The first and second main bodies are nested together, passing through the through slot. The through slot is used to place the plate-shaped sample. When the plate-shaped sample is placed in the through slot, the first and second main bodies apply pressure from both sides towards the plate-shaped sample. The first main body and the second main body each include two supporting members and two baffles. The baffles of the first main body are disposed on both sides of the supporting members along a first direction, and the baffles of the second main body are disposed on both sides of the supporting members along a second direction. The first direction is perpendicular to the second direction. The first main body includes a first support member and a second support member. The second support member has a groove on its upper part that mates with the plate-shaped sample. The second main body includes a third support member and a fourth support member. The third support member is located between the first support member and the second support member, and the second support member is located between the third support member and the fourth support member. The plate-shaped sample is disposed between the third support member and the second support member.

2. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, Both the first connector and the second connector have outwardly protruding bosses in their middle sections, which are used to clamp the extensometer.

3. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, One end of the first connector and the second connector is provided with an external thread structure that mates with the internal thread structure of the creep testing machine, so that the first connector and the second connector are respectively threadedly connected to the two creep testing machines.

4. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, Both the support member and the baffle are provided with matching bolt holes. The support member and the baffle are connected by passing the bolts through the bolt holes.

5. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, The first connector is connected to the first support member, and the second connector is connected to the fourth support member.

6. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, The first main body includes a first baffle and a second baffle, and the second main body includes a third baffle and a fourth baffle. The first baffle and the second baffle are respectively disposed on both sides of the first support member and the second support member along a first direction. The third baffle and the fourth baffle are respectively disposed on both sides of the third support member and the fourth support member along a second direction. The plate-shaped sample is disposed between the first baffle, the second baffle, the third baffle and the fourth baffle.

7. The indentation creep testing machine fixture for plate-shaped specimens according to claim 6, characterized in that: in, The lengths of the first and second baffles in the second direction are the same as the lengths of the first and second supports in the second direction. The lengths of the first and second baffles in the third direction are the same as the distance between the first and second supports. The lengths of the third and fourth baffles in the first direction are the same as the lengths of the third and fourth supports in the first direction. The lengths of the third and fourth baffles in the third direction are the same as the distance between the third and fourth supports. The third direction is perpendicular to the first and second directions, respectively. The area of ​​the first and second baffles is larger than the area of ​​the third and fourth baffles.

8. The indentation creep testing machine fixture for plate-shaped specimens according to claim 1, characterized in that: in, The connecting mechanism and the main body are made of equiaxed high-temperature alloys, directionally solidified high-temperature alloys, or single-crystal high-temperature alloys.

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