Sample preparation device suitable for linear material fatigue performance test

Abstract

The utility model belongs to the field of fatigue test sample preparation of metal materials, and particularly relates to a sample preparation device suitable for a fatigue performance test of linear materials, which comprises a bottom plate, a wire limiting block, a butterfly bolt, a pouring mold, a metal buckle and a plug, one end of a wire is fixed on the wire limiting block, and the other end of the wire is fixed on the butterfly bolt; the pouring mold, the multiple metal buckles and the plug are sequentially arranged on the wire rod in a penetrating mode, then the plug, the multiple metal buckles and the pouring mold are sequentially arranged on the wire rod in a penetrating mode, and finally the wire rod is tensioned and fixed to the other wire rod limiting block; the metal buckle is fixed on the wire rod, and the plug is connected with the pouring mold; and an inlay material required by pouring is prepared and poured. According to the utility model, the wire rod is tensioned in advance, and the friction force of the plurality of metal buckles and the bonding force of the inlay material are combined, so that the smooth stress transition at each part of the wire rod can be ensured, and the load borne by the middle part of the sample in the fatigue test process is maximum, thereby accurately testing the fatigue performance of the wire rod.

Description

Technical Field

[0001] The utility model belongs to the field of fatigue test sample preparation of metal materials, in particular to a sample preparation device suitable for fatigue performance testing of linear materials. Background Art

[0002] Linear materials, such as metal wires and fibers, play an important role in many industrial fields. The fatigue performance of linear materials directly affects the service life and safety of products. Therefore, accurate evaluation of the fatigue performance of linear materials is crucial to ensure product quality and reliability. However, existing linear material fatigue performance test methods are often limited by sample preparation technology, making it difficult to obtain accurate and reliable test results.

[0003] At present, the preparation of specimens for fatigue performance testing of linear materials usually adopts a simple cutting method, followed by a winding fixation or clamping fixation method for fatigue testing. Although these methods are simple and easy to implement, they have many shortcomings. First, the winding fixation method will cause the linear material to bend and deform, introducing additional bending stress. For high-strength linear materials, their deformation capacity is poor, and the additional bending stress will cause the linear material to fail prematurely at the bending deformation during the fatigue test. Secondly, the winding fixation method essentially uses friction for fixation. During the fatigue test, wear will occur at the contact position between the linear material and the winding fixture, causing the linear material to fail prematurely. For the clamping fixation method, the modulus of the fixture and the linear material are generally different, which will cause additional stress concentration at the contact position between the linear material and the fixture. The clamping force of the fixture will also cause plastic deformation of the linear material, which generally causes the linear material to fail prematurely. The root cause of the above problems is that there is currently no scientific method for preparing fatigue samples of linear materials.

[0004] In summary, the existing method for preparing linear material fatigue performance test specimens has many shortcomings and is difficult to meet the needs of accurately evaluating the fatigue performance of linear materials. Utility Model Content

[0005] In order to solve the above-mentioned problems existing in the preparation of existing linear material fatigue performance test specimens, improve the accuracy and reliability of linear material fatigue performance testing, and provide more accurate and effective technical support for linear material fatigue performance testing, the purpose of the utility model is to provide a specimen preparation device suitable for linear material fatigue performance testing.

[0006] The purpose of this utility model is achieved through the following technical solutions:

[0007] The utility model comprises a bottom plate, a wire limiting block, a casting mold, a metal buckle and a plug, wherein two opposite wire limiting blocks are arranged on the bottom plate, a plurality of linear materials are stretched between the two wire limiting blocks, each of the linear materials has the same structure and is penetrated by two casting molds, the casting molds are hollow structures, one end of which is connected with a plug, a plurality of metal buckles are arranged on the linear materials in each casting mold, and the plugs connected on the two casting molds are arranged oppositely; a casting port is opened on each casting mold, and the inlay material is cast into the casting mold through the casting port.

[0008] Wherein: a linear material of a set length is respectively left between each casting mold and the adjacent wire limiting block and between two casting molds.

[0009] The height of the wire limiting block is half of the thickness of the casting mold.

[0010] The casting mold is divided into two sections, thick and thin, with a transitional reduced diameter section between the thick section and the thin section.

[0011] Each of the wire limit blocks is provided with a plurality of threaded holes, the number of threaded holes on the two wire limit blocks is the same and corresponds one to one, each of the threaded holes is threadedly connected with a butterfly bolt, and both ends of each of the linear materials are fixed to the wire limit blocks by the butterfly bolts in the corresponding threaded holes.

[0012] The metal buckle is a ring-shaped structure. After the linear material passes through the metal buckle, the metal buckle is clamped on the linear material by clamping.

[0013] Before pouring the inlay material, a cardboard is placed on the bottom plate, and the cardboard is located below each pouring mold, and the inlay material overflowed from the pouring flows onto the cardboard.

[0014] The advantages and positive effects of the utility model are:

[0015] 1. The utility model can ensure smooth transition of stress at various locations of the linear material by pre-tensioning the linear material, combining the friction of multiple metal buckles and the bonding force of the inlay material, and the load borne by the middle part of the sample during the fatigue test is the largest, thereby accurately testing the fatigue performance of the linear material itself, solving the problem of difficulty in obtaining accurate and reliable test results in the prior art.

[0016] 2. The parts and consumables used in this utility model are all mature industrial standard products that are easy to purchase, and the operation process is simple, the success rate of sample preparation is high, the experimental cost is reduced, and resources are saved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the overall structural front view of the utility model;

[0018] Figure 2 for Figure 1 Left view of

[0019] Figure 3 for Figure 1 The structural front view of the center wire limit block;

[0020] Figure 4 for Figure 3 Left side view with butterfly bolts installed;

[0021] Figure 5 for Figure 1 Schematic diagram of the structure of the casting mold;

[0022] Among them: 1 is a bottom plate, 2 is a wire limit block, 3 is a butterfly bolt, 4 is a casting mold, 5 is a metal buckle, 6 is a plug, 7 is a casting port, 8 is a threaded hole, and 9 is a linear material. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1 , Figure 2 As shown, the utility model includes a base plate 1, a wire limit block 2, a casting mold 4, a metal buckle 5 and a plug 6, wherein two opposite wire limit blocks 2 are provided on the base plate 1, and a plurality of linear materials 9 are tensioned between the two wire limit blocks 2. Each linear material 9 has the same structure and is penetrated by two casting molds 4. The casting mold 4 is a hollow structure and a plug 6 is connected at one end. A plurality of metal buckles 5 are provided on the linear material in each casting mold 4, and the plugs 6 connected on the two casting molds 4 are arranged oppositely; a pouring port 7 is opened on each casting mold 4, and the inlay material is poured into the casting mold 4 through the pouring port 7.

[0025] The bottom plate 1 of this embodiment is a rectangular plate, and a wire limiting block 2 is fixed at each end of the bottom plate 1 in the length direction. Figures 1 to 4 As shown, the wire limit block 2 of this embodiment is a rectangular block, and the two wire limit blocks 2 are arranged in parallel. The length direction of the wire limit block 2 is the width direction of the base plate 1; each wire limit block 2 is provided with a plurality of threaded holes 8 along the length direction, so as to facilitate the simultaneous preparation of multiple specimens for fatigue testing of linear materials; the threaded holes 8 on the two wire limit blocks 2 are the same in number (five in this embodiment) and correspond one to one, and each threaded hole 8 is threadedly connected with a butterfly bolt 3, so as to facilitate the operator's barehand operation, and the two ends of each linear material 9 are respectively fixed to the wire limit block 2 by the butterfly bolts 3 in the corresponding threaded holes 8.

[0026] like Figure 1 , Figure 2 and Figure 5As shown, the casting mold 4 of this embodiment is a hollow structure, one end of which is provided with a hole for the linear material 9 to penetrate, and the other end is an open structure for the metal buckle 5 to enter the casting mold 4 and connect with the plug 6. The casting mold 4 is divided into two sections, thick and thin, with a transitional reduced diameter section between the thick section and the thin section, which is convenient for using a shoulder-type clamp to quickly fix the casting mold part of the sample during the later fatigue test. The height of the wire limit block 2 of this embodiment is half the thickness of the casting mold 4, which is convenient for keeping the wire tension state unaffected when fixing the casting mold 4. A set length of linear material 9 is left between each casting mold 4 and the adjacent wire limit block 2 and between two casting molds 4, which is convenient for fixing the linear material 9 during the later fatigue test. The casting mold 4 and the plug 6 of this embodiment are made of plastic, which achieves the purpose of protecting the linear material 9 from additional scratches, and the casting mold 4 and the plug 6 can be tested with the sample without demoulding.

[0027] The metal buckle 5 is an annular structure. The end face of the metal buckle 5 of this embodiment is a square ring with arc-shaped ends. After the linear material 9 passes through the metal buckle 5, the metal buckle 5 is clamped on the linear material 9 by clamping. The metal buckle 5 is used inside the casting mold 4. When the inlay material solidifies, the additional friction provided by the metal buckle 5 is transferred to the inlay material. In the later fatigue test, only the casting mold part of the sample needs to be fixed, and the bonding force of the inlay material and the friction force of the metal buckle 5 are used at the same time.

[0028] In this embodiment, before pouring the inlay material, a cardboard is placed on the bottom plate 1, and the cardboard is located below each pouring mold 4, and the inlay material overflowed from the pouring flows onto the cardboard.

[0029] The sample preparation method of the utility model comprises the following steps: fixing one end of a linear material 9 on a linear material limiting block 2, sequentially threading a casting mold 4, a plurality of metal buckles 5, and a plug 6 on the linear material 9, and then sequentially threading the plug 6, a plurality of metal buckles 5, and another casting mold 4 on the linear material 9, fixing the other end of the linear material 9 on another linear material limiting block 2, and the linear material 9 is in a tensioned state; fixing each metal buckle 5 on the linear material 9, moving the casting mold 4, allowing the metal buckle 5 to enter the casting mold 4, and connecting two plugs 6 to the two casting molds 4 respectively; finally, pouring an inlay into the casting mold 4 through a pouring port 7, and completing the sample preparation after the inlay solidifies.

[0030] Before pouring the inlay material into the pouring mold 4, the pouring mold 4 and the base plate 1 are kept fixed, and the pouring mold 4 can be glued to the base plate 1 with a double-sided tape; after the sample preparation is completed, the pouring mold 4 is removed from the base plate 1.

[0031] Experimental example

[0032] Taking ultra-high-strength steel cord monofilament as an example, the ultra-high-strength steel cord refers to ST225, with a strength of 3000-3500MPa; in this experimental example, five threaded holes 8 are processed on each wire limit block 2, and the base plate 1 is made of wood. Tape and cardboard are pasted on the base plate 1 to quickly clean up when the inlay material overflows; a cut disposable dropper is used as a casting mold 4, and an epoxy resin curing agent is used as the inlay material. The epoxy resin curing agent in this experimental example is the TRUER ultra-fast high-hardness cold inlay kit produced by Shanghai Chuanhe Industrial Development Co., Ltd., and an aluminum buckle is used as the metal buckle 5 in this experimental example.

[0033] The preparation steps include: fixing one end of the linear material 9 on a wire limit block 2 with a butterfly bolt 3, threading a casting mold 4, multiple metal buckles 5 and a plug 6 on the linear material 9 in sequence, then threading the plug 6, multiple metal buckles 5 and the casting mold 4 on the linear material 9 in sequence, and finally tightening the linear material 9, and fixing the other end of the linear material 9 on another wire limit block 2 with a butterfly bolt 3; the linear material 9 passes through the casting mold 4, and a set length (20 cm in this experimental example) of the linear material 9 is left at both ends of the casting mold 4; pouring the inlay material into the casting mold 4 through the pouring port 7, and the sample preparation is completed after the inlay material solidifies (the curing time is 4 hours). In this experimental example, three fatigue performance test specimens were prepared at one time.

[0034] After the samples prepared by the utility model were subjected to fatigue tests, the samples all failed in the linear material 9 itself, verifying the feasibility and advancement of the utility model.

[0035] The above description is only an implementation method of the utility model and is not intended to limit the protection scope of the utility model. Any modification, equivalent replacement, improvement, expansion, etc. made within the spirit and principle of the utility model are included in the protection scope of the utility model.

Claims

1. A sample preparation device suitable for fatigue performance testing of linear materials, characterized by: The invention comprises a bottom plate (1), a wire limiting block (2), a casting mold (4), a metal buckle (5) and a plug (6), wherein two wire limiting blocks (2) are arranged opposite to each other on the bottom plate (1), a plurality of linear materials (9) are stretched between the two wire limiting blocks (2), each of the linear materials (9) has the same structure and is penetrated by two casting molds (4), the casting mold (4) is a hollow structure and is connected to a plug (6) at one end, a plurality of metal buckles (5) are arranged on the linear materials in each casting mold (4), and the plugs (6) connected to the two casting molds (4) are arranged opposite to each other; each casting mold (4) is provided with a casting port (7), and the inlay material is cast into the casting mold (4) through the casting port (7).

2. The sample preparation device suitable for fatigue performance testing of linear materials according to claim 1, characterized in that: A linear material (9) of a set length is respectively left between each of the casting moulds (4) and the adjacent wire material limiting block (2), and between two casting moulds (4).

3. The sample preparation device for fatigue performance testing of linear materials according to claim 1, characterized in that: The height of the wire limiting block (2) is half the thickness of the casting mold (4).

4. The sample preparation device for fatigue performance testing of linear materials according to claim 1, characterized in that: The casting mold (4) is divided into two sections, thick and thin, with a transitional reduced diameter section between the thick section and the thin section.

5. The sample preparation device for fatigue performance testing of linear materials according to claim 1, characterized in that: Each of the wire limiting blocks (2) is provided with a plurality of threaded holes (8), the threaded holes (8) on the two wire limiting blocks (2) are of the same number and correspond to each other, each of the threaded holes (8) is threadedly connected with a butterfly bolt (3), and both ends of each of the linear materials (9) are fixed to the wire limiting blocks (2) via the butterfly bolts (3) in the corresponding threaded holes (8).

6. The sample preparation device for fatigue performance testing of linear materials according to claim 1, characterized in that: The metal buckle (5) is a ring-shaped structure. After the linear material (9) passes through the metal buckle (5), the metal buckle (5) is clamped on the linear material (9) in a clamping manner.

7. The sample preparation device for fatigue performance testing of linear materials according to claim 1, characterized in that: Before pouring the inlay material, a cardboard is placed on the bottom plate (1), and the cardboard is located below each pouring mold (4), and the inlay material overflowed from the pouring flows onto the cardboard.

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