CN217901403U - Clamp for tensile strength test and tensile strength test equipment - Google Patents

Clamp for tensile strength test and tensile strength test equipment Download PDF

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Publication number
CN217901403U
CN217901403U CN202221776989.1U CN202221776989U CN217901403U CN 217901403 U CN217901403 U CN 217901403U CN 202221776989 U CN202221776989 U CN 202221776989U CN 217901403 U CN217901403 U CN 217901403U
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China
Prior art keywords
tensile strength
shaft hole
stretching rod
groove
strength test
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CN202221776989.1U
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Chinese (zh)
Inventor
钱雨
田志宏
杨竞
刘响
姜宇恒
付杰
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Inspection and Certification Co Ltd
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Central Research Institute of Building and Construction Co Ltd MCC Group
MCC Inspection and Certification Co Ltd
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Priority to CN202221776989.1U priority Critical patent/CN217901403U/en
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Abstract

The utility model relates to a tensile experiment utensil technical field discloses a fixture and tensile strength test equipment for tensile strength test, and this fixture includes: one end of the stretching rod is provided with a connector which can be connected with a testing machine, and the other end of the stretching rod is provided with a first shaft hole which is vertical to the length direction in the middle; the middle part of the bonding block is provided with a groove capable of containing the other end of the stretching rod, a second shaft hole opposite to the first shaft hole is arranged on the wall of the groove, one end, far away from the stretching rod, of the bonding block is provided with a bonding surface capable of being abutted against the end surface of a sample to be tested, and the vertical projection of the second shaft hole on the bonding surface is positioned in the center of the bonding surface; and the connecting shaft is arranged in the first shaft hole and the second shaft hole in a penetrating manner. When the tensile strength testing equipment with the fixture is used for carrying out tensile testing on inorganic non-metallic materials, the force transmission path is short, the eccentricity is avoided in the process, and the stress concentration phenomenon cannot occur.

Description

Clamp for tensile strength test and tensile strength test equipment
Technical Field
The utility model relates to a tensile experiment utensil technical field, it is concrete, relate to a fixture and tensile strength test equipment are used in tensile strength test of non-centre gripping formula.
Background
With the large-scale and abnormal-shaped construction of modern buildings, the space structure develops towards larger span. The top structure of the building is usually connected by using steel bar-concrete and anchor bolt-concrete components under normal temperature service environment, and the hanging high temperature resistant brick is adopted as an anchoring connection mode under high temperature service environment. Therefore, in order to ensure the engineering quality and safety, the tensile strength of the member and the anchoring material must be considered when designing the structure. In the field of pyrometallurgical technology, particularly heating furnaces are taken as examples, and since the anchoring bricks are the main brick types used for building the furnace tops of the heating furnaces, the tension bearing capacity of the anchoring bricks is an important investigation index for quality safety.
Tensile strength tests are required for each batch of anchor bricks. In laboratory testing, a conventional fixture fixes both ends of a sample, stretches the sample at a constant rate, and takes the ratio of the maximum breaking force to the cross-sectional breaking area as a final tensile strength value. However, various problems exist in the tensile test of inorganic non-metallic materials at present in China, such as: the internal structure of the clamp is complex and the cost is high; the force application direction of the testing machine deviates from the stress direction of the sample, and the force application direction and the stress direction are not on the same straight line, so that the test is not accurate enough; the clamping apparatus is in clamping contact with the sample, so that stress concentration is caused, and the sample is easy to break at the opening of the clamping apparatus.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve above-mentioned technical problem and make, its purpose provides a fixture and tensile strength test equipment for tensile strength test of non-centre gripping formula, when carrying out the tensile test to inorganic non-metallic material, its biography power route is accurate, stress concentration phenomenon can not appear.
In order to realize the above-mentioned purpose, on the one hand, the utility model provides a fixture for tensile strength test, include: one end of the stretching rod is provided with a connector which can be connected with a testing machine, and the other end of the stretching rod is provided with a first shaft hole which is vertical to the length direction in the middle; the middle part of the bonding block is provided with a groove capable of containing the other end of the stretching rod, the wall of the groove is provided with a second shaft hole opposite to the first shaft hole, one end of the bonding block, which is far away from the stretching rod, is provided with a bonding surface capable of being abutted against the end surface of a sample to be tested, and the vertical projection of the second shaft hole on the bonding surface is positioned in the center of the bonding surface; and the connecting shaft is arranged in the first shaft hole and the second shaft hole in a penetrating manner.
Preferably, the groove is a U-shaped groove; the other end of the stretching rod is flat, and the side surface of the stretching rod can be abutted against the groove wall of the groove.
Preferably, an arc-shaped chamfer is arranged at the side edge of the other end of the stretching rod.
Preferably, a limiting convex ring extending to the axis is arranged at the central position of the first shaft hole, and the inner diameter of the limiting convex ring is d 1 (ii) a The center position of connecting axle is equipped with the spacing groove along circumference, the shaft diameter of connecting axle is d 2 (ii) a Wherein d is more than or equal to-2 mm 2 -d 1 Less than or equal to 2mm, and the depth of the limiting groove is not less than 4mm.
Preferably, the cross-sectional shapes of the limiting convex ring and the limiting groove are arc-shaped.
Preferably, the bonding surface is a plane or an arc surface.
In order to achieve the above object, on the other hand, the utility model provides a tensile strength test equipment, include: a testing machine having two heads which can be moved toward/away from each other; the two fixtures for the tensile strength test are fixedly connected to the machine head through the interfaces.
According to the above description and practice, fixture for tensile strength test come to be connected with the sample that awaits measuring through coating the adhesive on the face of pasting at bonding piece tip, need not the centre gripping sample that awaits measuring when carrying out tensile test, consequently can not produce stress concentration, avoid the sample at the fracture with the fixture junction. In addition, the bonding block is connected with the stretching rod through the connecting shaft, the bonding block, the stretching rod and the stretching rod are positioned on the same axis, the pulling force exerted on the sample to be tested and the axis of the sample to be tested can be in the same direction, the torsion force on the sample to be tested is avoided, the sample is prevented from being broken at the bonding root, and the testing accuracy is improved. In addition, the fixture for the tensile strength test is simple in structure, the operability of the tensile test is enhanced, and the test cost is reduced.
Drawings
Fig. 1 is an exploded view of a fixture for tensile strength testing according to an embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of the fixture for tensile strength testing according to an embodiment of the present invention.
The reference numbers in the figures are:
1. a stretch rod; 11. a first shaft hole; 12. a limit convex ring; 2. bonding blocks; 21. a second shaft hole; 22. a groove; 3. a connecting shaft; 31. a limiting groove.
Detailed Description
Exemplary embodiments will now be described more fully with reference to the accompanying drawings. The exemplary embodiments, however, may be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted. In the present disclosure, the terms "include", "arrange", "disposed" and "disposed" are used to mean open-ended inclusion, and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting as to the number or order of their objects; the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present invention.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In this embodiment, there is provided a tensile strength test jig which is mounted on a head of a test machine for performing a tensile test, and which transmits a tensile force of the test machine to a sample to be tested. Fig. 1 is an exploded view of the tensile strength test jig, in which the respective members are exploded in a longitudinal direction; fig. 2 shows a cross-sectional structure of the jig for tensile strength test.
Referring to fig. 1 and 2, the tensile strength test jig in this embodiment includes a stretching rod 1, an adhesive block 2, and a connecting shaft 3. The upper end of the stretching rod 1 is used for being connected with a testing machine, and the end part of the stretching rod is provided with a circular interface which can be connected with a machine head of the testing machine through a pin shaft when in use; the lower end of the stretching rod 1 is provided with a first shaft hole 11 which can be penetrated by the connecting shaft 3. The bonding block 2 is provided with a second shaft hole 21 which can be penetrated by the connecting shaft 3, so that the bonding block 2 can be rotatably connected to the lower end of the stretching rod 1 through the connecting shaft 3.
Specifically, the first shaft hole 11 is centrally disposed and perpendicular to the length direction of the stretching rod 1, the middle portion of the bonding block 2 is provided with a groove 22 capable of accommodating the lower end of the stretching rod 1, the second shaft hole 21 is disposed on the groove wall of the groove 22, and the lower end of the bonding block 2 is a bonding surface connected with a sample to be tested. When the bonding block 2 is used, an adhesive, such as a bar-planting adhesive, is coated on the bonding surface, and the tensile strength of the adhesive is higher than that of a similar sample to be tested, so that the joint of the sample to be tested and the bonding block 2 cannot be separated when the sample to be tested is subjected to a tensile test. For example, after the material of the sample to be tested is determined, the range of the tensile strength of the sample to be tested can be determined by looking up relevant documents, detection data and the like, and when the adhesive is selected, it is sufficient to ensure that the tensile strength of the adhesive is greater than the maximum value of the tensile strength of the sample to be tested, and certainly, when the tensile strength of the adhesive is greater than the maximum value, the detection effect is better.
In the fixture for testing the tensile strength, the lower end of a stretching rod 1 is positioned in a bonding block 2, a first shaft hole 11, a second shaft hole 21 and a connecting shaft 3 are all positioned in the center of the stretching rod 1, and a sample to be tested can be connected to the position, opposite to the axis of the stretching rod 1, of the lower end face of the bonding block 2 during tensile testing. The tensile force of the testing machine can be transmitted to the sample to be tested through the tensile rod 1, the connecting shaft 3 and the bonding block 2, and the transmission part is in point and line contact, so that the tensile force borne by the sample to be tested and the axis of the sample to be tested are in the same direction, torsion cannot be generated on the sample to be tested, further, the sample is prevented from being broken at the bonding root, and the testing accuracy is improved. In addition, the piece to be tested passes through the direct linking to each other of adhesive with bonding piece 2, can not produce the condition of stress concentration in the periphery of the sample that awaits measuring, and then avoids appearing traditional anchor clamps and press from both sides more tightly when the test, causes the condition that the sample that awaits measuring is in anchor clamps mouth department destruction. Meanwhile, the bonding block 2 is bonded with the sample to be tested, so that the fixture is ensured not to cause prestress damage to the sample to be tested.
In this embodiment, the lower end of the stretching rod 1 is flat, the groove 22 is a U-shaped groove, and the side surface thereof can abut against the side wall of the groove 22, so that the shaking amplitude of the adhesive block 2 in the left-right direction in fig. 2 can be reduced during use. Meanwhile, the bonding block 2 can rotate around the connecting shaft 3, so that the fixture can also be applied to a sample to be tested with the end face being an inclined face. In addition, the side edge of the lower end of the stretching rod 1 is provided with an arc chamfer, so that the fixture is convenient to assemble, and the bonding block 2 can be ensured to rotate around the connecting shaft 3 smoothly.
In addition, in this embodiment, a limit convex ring 12 extending toward the shaft center is provided at the center position of the first shaft hole 11, a limit groove 31 is provided at the center position of the connecting shaft 3 along the circumferential direction, and the depth of the limit groove 31 is not less than 4mm. Wherein, the inner diameter of the limit convex ring 12 is d 1 The diameter of the connecting shaft 3 is d 2 In this embodiment, d 2 =d 1 Namely, the connecting shaft 3 can just penetrate through the limiting convex ring 12 in the middle of the first shaft hole 11, and when the clamping device is used, the limiting convex ring 12 can be clamped in the limiting groove 31, so that the connecting shaft 3 is prevented from sliding along the self axial direction, and the clamping device is more stable. In other embodiments, d 2 -d 1 Can also take value within the range of (-2mm, 2mm), when d 2 Greater than d 1 In the process, the connecting shaft 3 is in interference fit with the limiting convex ring 12, so that the stability of the fixture can be further improved; when d is 2 Is less than d 1 When the bonding block 2 is mounted, the connecting shaft 3 is limited by the matching of the limiting groove 31 and the limiting convex ring 12, the bonding block 2 is convenient to mount and dismount, and a user can mount the bonding block 2 matched with the end face of the sample to be tested according to the shape of the sample to be tested. In addition, the cross-sectional shapes of the limiting convex ring 12 and the limiting groove 31 are both arc-shaped, so that the contact area of the limiting convex ring and the limiting groove can be increased, and the force transmission of the clamp is more stable when the clamp is used.
It should be noted that the shape of the lower end surface (i.e., the bonding surface) of the bonding block 2 should match the shape of the sample to be tested. For example, when the end face of the sample to be measured is a plane, the bonding face is also a plane; when the end face of the sample to be tested is a cambered surface, the bonding surface is also a cambered surface. Thereby ensuring that the bonding block 2 can be tightly and firmly connected with the end surface of the sample to be measured.
In this embodiment, the perpendicular projection of second shaft hole 21 on the face of bonding is located the center of the face of bonding, consequently when will await measuring the sample and install on the face of bonding, only need with the sample that awaits measuring set up between two parties on the face of bonding, can guarantee that the pulling force direction that the test machine was applyed is in the central line of the sample that awaits measuring, can avoid producing torsion on the sample that awaits measuring, and then has avoided the sample to fracture at the bonding root, has improved the precision of test.
In addition, in the embodiment, the tensile strength testing equipment is further disclosed, and the equipment adopts the fixture for the tensile strength testing. Specifically, the tensile strength testing equipment comprises a testing machine capable of providing tensile force, two machine heads which can be close to or far away from each other are arranged on the testing machine, each machine head is provided with the clamp for the tensile strength testing, and namely, an interface at the end part of the stretching rod 1 is fixedly connected with the machine head. In addition, the device also comprises a controller and a processor for controlling the operation of the machine head, recording the tension value and calculating the tensile strength value, the part can be realized by a computer and a corresponding control program, and the specific process is not repeated.
When the tensile strength test equipment is used for testing the tensile strength of a sample to be tested, the tensile strength test equipment comprises the following steps:
firstly, coating adhesives on the end face and the bonding surface of a sample to be tested, and respectively bonding the end face of the sample to be tested on the two bonding blocks 2 on the machine head until the connection strength of the end face and the bonding surface reaches a preset value. For example, when the bar planting glue is used as the adhesive, the two are adhered together and then need to stand for more than three minutes to ensure that the two are firmly connected. And the tensile strength of the adhesive is higher than that of the similar samples to be tested.
And then starting the testing machine, enabling the two machine heads on the testing machine to be away from each other at a preset speed until the sample to be tested is pulled apart, and recording the pulling force value applied to the sample to be tested by the testing machine at the moment of pulling apart. The user can set the speed by the computer, and the pulling force value can be recorded by the computer for subsequent calculation.
And finally, calculating the tensile strength value of the sample to be tested according to the tensile force value and the cross section area of the sample to be tested. The calculation process can also be automatically executed by the computer according to a preset program.
When the tensile strength testing equipment is used for testing the tensile strength of a sample made of an inorganic non-metallic material, the tensile rod 1 can drive the bonding block 2 to enable the sample to be tested to move up and down through the connection of the connecting shaft 3, and in addition, the transmission part is in point and line contact, so that the tensile force applied to the sample to be tested and the axis of the sample to be tested can be in the same direction, and the torque force cannot appear on the sample to be tested. For the sample to be tested with low strength, the bonding block 2 is connected with the sample to be tested in a bonding manner, so that the clamp is ensured not to cause prestress damage to the sample to be tested. For the high-strength sample to be tested, the clamp and the sample to be tested are connected in a bonding mode, so that the situation that the sample to be tested is damaged at the position of the clamp opening due to stress concentration and tighter clamping in the experiment loading process is avoided.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims (7)

1. A fixture for tensile strength tests is characterized by comprising:
one end of the stretching rod is provided with a connector which can be connected with a testing machine, and the other end of the stretching rod is provided with a first shaft hole which is vertical to the length direction in the middle;
the middle part of the bonding block is provided with a groove capable of containing the other end of the stretching rod, a second shaft hole opposite to the first shaft hole is arranged on the wall of the groove, one end, far away from the stretching rod, of the bonding block is provided with a bonding surface capable of being abutted against the end surface of a sample to be tested, and the vertical projection of the second shaft hole on the bonding surface is positioned in the center of the bonding surface;
and the connecting shaft is arranged in the first shaft hole and the second shaft hole in a penetrating manner.
2. The tensile strength test jig of claim 1,
the groove is a U-shaped groove;
the other end of the stretching rod is flat, and the side surface of the stretching rod can be abutted against the groove wall of the groove.
3. The tensile strength test jig according to claim 2,
and an arc-shaped chamfer is arranged at the side edge of the other end of the stretching rod.
4. The tensile strength test jig of claim 1,
the central point in first shaft hole puts and is equipped with the spacing bulge loop that extends to axle center department, the internal diameter of spacing bulge loop is d 1
The center position of connecting axle is equipped with the spacing groove along circumference, the shaft diameter of connecting axle is d 2
Wherein d is more than or equal to-2 mm 2 -d 1 Less than or equal to 2mm, and the depth of the limiting groove is not less than 4mm.
5. The tensile strength test jig according to claim 4,
the cross-sectional shapes of the limiting convex ring and the limiting groove are arc-shaped.
6. The fixture for tensile strength test according to any one of claims 1 to 5,
the bonding surface is a plane or a cambered surface.
7. A tensile strength testing apparatus, comprising:
a testing machine having two heads which can be moved toward/away from each other;
the two fixtures used for the tensile strength test according to any one of claims 1 to 6, wherein the interface is fixedly connected to the machine head.
CN202221776989.1U 2022-07-11 2022-07-11 Clamp for tensile strength test and tensile strength test equipment Active CN217901403U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202221776989.1U CN217901403U (en) 2022-07-11 2022-07-11 Clamp for tensile strength test and tensile strength test equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202221776989.1U CN217901403U (en) 2022-07-11 2022-07-11 Clamp for tensile strength test and tensile strength test equipment

Publications (1)

Publication Number Publication Date
CN217901403U true CN217901403U (en) 2022-11-25

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ID=84134130

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202221776989.1U Active CN217901403U (en) 2022-07-11 2022-07-11 Clamp for tensile strength test and tensile strength test equipment

Country Status (1)

Country Link
CN (1) CN217901403U (en)

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