A kind of polymer waterproofing membrane tensile test sample preparation auxiliary device

Abstract

A kind of polymer waterproofing membrane tensile test sample preparation auxiliary device, including locating plate, horizontal line slot is spaced apart in locating plate, every horizontal line slot is smoothly transitionally connected with arc line slot at both ends, and the arc line slot of left and right mirror image symmetry is arranged;Clamp alignment line slot is arranged between the end of upper and lower arc line slot;Middle line slot is opened between two clamp alignment line slots in middle, and middle line slot is spaced apart and arranged with elongation line slot.The polymer waterproofing membrane tensile test sample preparation auxiliary device provided in the utility model can accurately and quickly cut polymer waterproofing membrane tensile test sample.

Description

Technical Field

[0001] This utility model relates to the field of experimental sample preparation auxiliary devices, and in particular to an auxiliary device for tensile testing of polymer waterproof membrane. Background Technology

[0002] Waterproof membranes are one of the most important materials in engineering construction, used to prevent water penetration and protect buildings from water damage. They provide effective waterproofing for areas such as roofs, basements, and bathrooms. The tensile strength and elongation obtained from tensile tests are important indicators reflecting their quality performance.

[0003] Tensile testing requires cutting at least five specimens each in the longitudinal and transverse directions from representative samples that are free of folds, creases, or wrinkles. Method A is applicable to all materials. If the material does not fracture when using Method A, then Method B should be used to determine the tensile properties of the material. Method B uses rectangular specimens, each with dimensions of 115 mm in length, 25 mm in end width, and 6 mm in width of the narrow parallel portion. The specimens are held between the clamp jaws at a spacing of 80 mm, and the elongation marking lines are spaced 25 mm apart.

[0004] When clamping the specimen, align the centerline of the specimen along its length with the centerline of the testing machine fixture. To prevent any relaxation of the specimen, it is recommended to apply a pre-tension force not exceeding 5N. After the specimen is clamped and the extensometer is installed, start the tensile testing machine. The constant speed of the fixture movement is (100±10) mm / min. Apply the load until the specimen breaks.

[0005] Currently, the preparation and cutting of rectangular specimens for tensile testing method B generally relies on manual measurement and positioning, which is not only time-consuming and inefficient, but also results in inaccurate cutting dimensions, affecting the accuracy of the test results. Summary of the Invention

[0006] The technical problem to be solved by this utility model is to provide an auxiliary device for preparing samples for tensile testing of polymer waterproof membranes, which can accurately and quickly cut samples for tensile testing of polymer waterproof membranes, greatly improving the testing speed and ensuring the accuracy of sample dimensions.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: A sample preparation auxiliary device for tensile testing of polymer waterproof membrane includes a positioning plate with horizontal grooves spaced apart at the top and bottom. Each horizontal groove is smoothly connected to an arc-shaped groove at both ends. The two arc-shaped grooves on the left and right are arranged in a mirror image symmetrically. A clamp alignment groove is provided between the ends of the upper and lower arc-shaped grooves. A center groove is provided between the two clamp alignment grooves in the middle. The center groove is spaced apart on the left and right and has elongation grooves arranged thereon.

[0008] The horizontal groove does not intersect with the center groove and the extended groove; the clamp alignment groove does not intersect with the arc groove.

[0009] The horizontal groove, the arc groove, and the clamp alignment groove together form a dumbbell shape.

[0010] The width of the arc-shaped groove, the fixture alignment groove, the center groove, the fixture alignment groove, the elongation groove, and the horizontal groove is 1 mm.

[0011] The positioning plate is made of transparent acrylic glass or plastic.

[0012] The center groove and the elongated groove are both perpendicular to the long side of the rectangular plate.

[0013] The two clamps are 80mm apart in the alignment grooves and are symmetrically arranged on both sides of the center groove; the two elongated grooves are 25mm apart and are symmetrically arranged on both sides of the center groove.

[0014] A handle is fixed to the positioning plate.

[0015] This utility model provides an auxiliary device for preparing samples for tensile testing of polymer waterproof membranes, which has the following technical effects: the device is processed according to the requirements of rectangular specimen samples in tensile test method B, so that it can be directly used after marking and cutting along the groove; and it is equipped with clamps for aligning the groove and elongating the groove, which can ensure the accurate installation position of the specimen sample. This ensures that the specimen sample and installation operation are consistent, which not only greatly improves the test speed, but also ensures the accuracy of the sample size and guarantees the authenticity and reliability of the test results. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the structure of the present invention (first perspective).

[0017] Figure 2 This is a schematic diagram of the structure of the present invention (second perspective).

[0018] Figure 3 This is the front view of the present invention.

[0019] Figure 4 This is a schematic diagram of the scribing or cutting lines in this utility model.

[0020] In the diagram: 1. Positioning plate; 2. Arc-shaped groove; 3. Centerline groove; 4. Fixture alignment groove; 5. Extension groove; 6. Handle; 7. Horizontal groove. Detailed Implementation

[0021] like Figure 1-2As shown, an auxiliary device for preparing samples for tensile testing of polymer waterproof membrane includes a positioning plate 1, which is a rectangular plate. The length L1 of the positioning plate 1 is 115mm, the width L2 is 25mm, and the thickness of the rectangular plate 1 is 2mm.

[0022] Two horizontal grooves 7 are arranged vertically at intervals near the center of the positioning plate 1. Each horizontal groove 7 has a mirror-symmetrical arc groove 2 on both sides. A clamping alignment groove 4 is arranged between the upper and lower arc grooves 2, with the upper ends of the clamping alignment groove 4 maintaining a distance from the arc groove 2. The two clamping alignment grooves 4, the four arc grooves 2, and the two horizontal grooves 7 together form a dumbbell shape.

[0023] A center groove 3 is vertically positioned between the two horizontal grooves 7, and elongated grooves 5 are vertically arranged at intervals on both sides of the center groove 3. The upper and lower ends of the center groove 3 and the elongated grooves 5 are spaced apart from the horizontal grooves 7.

[0024] A handle 6 is fixed horizontally between the two horizontal grooves 7.

[0025] The length L3 of the horizontal groove 7 is 33mm, and the width L4 between the two horizontal grooves 7 is 6mm. The arc-shaped groove 2 is composed of two arc segments, one with a radius R1 of 14mm and the other with a radius R2 of 25mm.

[0026] The center groove 3 is located at 1 / 2 of the length of the positioning plate 1 and is perpendicular to the long side of the positioning plate 1. The distance between the two clamping alignment grooves 4 is 80mm. The distance between the two elongation grooves 5 is 25mm.

[0027] Neither the arc-shaped groove 2 nor the clamp alignment groove 4 intersects with the length edge of the positioning plate 1.

[0028] Neither the centerline groove 3 nor the elongated groove 5 intersects with the horizontal groove 7.

[0029] The positioning plate 1 is made of plexiglass or plastic.

[0030] Working principle and process: 1) When cutting the sample, place the representative waterproof membrane sample flat on the workbench. The sample should be flat and free of obvious defects such as creases, holes, and stains. Place the device flat on the sample, hold the handle 6 with one hand, and use a marker to draw lines along the outer edge of the positioning plate 1, then draw lines along the arc groove 2 and the horizontal groove 7, and then draw alignment lines along the two clamp alignment grooves 4 (the lines are drawn as follows). Figure 4 As shown in Figure a), two elongation grooves 5 are marked with elongation lines (marked as shown in Figure a). Figure 4 (As shown in b), finally draw the midline line along the midline groove 3 (the line is drawn as shown in b). Figure 4 (As shown in c).

[0031] 2) Remove the device and use scissors or a utility knife to cut the sample along the edges of the arc-shaped groove 2 and the horizontal groove 7, making the sample dumbbell-shaped (cutting lines are as follows). Figure 4 (as shown in d).

[0032] 3) Mount the cut sample onto the tensile testing machine. Use two clamps to align the jaws along the alignment line drawn on the clamping groove 4 (as shown in the diagram). Figure 4 Clamp the specimen (as shown in a) with the two alignment lines aligned with the edges of the upper and lower clamps as much as possible. Then install the extensometer on the two elongation lines (as shown in a) Figure 4 (as shown in b)

Claims

1. An auxiliary device for preparing samples for tensile testing of polymer waterproof membranes, characterized in that: The system includes a positioning plate (1), which has horizontal grooves (7) spaced apart vertically. Each horizontal groove (7) is smoothly connected to an arc groove (2) at both ends. The two arc grooves (2) on the left and right are arranged in a mirror symmetrical manner. A clamp alignment groove (4) is provided between the ends of the upper and lower arc grooves (2). A center groove (3) is provided between the two clamp alignment grooves (4). An elongated groove (5) is arranged on the left and right sides of the center groove (3).

2. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 1, characterized in that: The horizontal groove (7) does not intersect with the center groove (3) and the elongated groove (5); the clamp alignment groove (4) does not intersect with the arc groove (2).

3. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 2, characterized in that: The horizontal groove (7), the arc groove (2), and the clamp alignment groove (4) together form a dumbbell shape.

4. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 3, characterized in that: The width of the arc-shaped groove (2), the fixture alignment groove (4), the center groove (3), the fixture alignment groove (4), the elongation groove (5), and the horizontal groove (7) is 1 mm.

5. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 4, characterized in that: The positioning plate (1) is made of transparent organic glass or plastic.

6. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 5, characterized in that: The center groove (3) and the elongation groove (5) are both perpendicular to the long side of the rectangular plate.

7. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 6, characterized in that: The two clamps are 80mm apart and are symmetrically arranged on both sides of the center groove (3); the two elongated grooves (5) are 25mm apart and are symmetrically arranged on both sides of the center groove (3).

8. The auxiliary device for preparing samples for tensile testing of polymer waterproof membrane according to claim 7, characterized in that: A handle (6) is fixed on the positioning plate (1).

Images