Sheet impact performance detection method
By cutting a thin metal sheet into multiple impact samples and fixing them into a mold, the problems of twisting deformation and inaccurate center height of the thin sheet in the impact test are solved, and high-precision impact absorption energy detection is achieved.
Patent Information
- Application Number
- CN202511993241.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-26
- Publication Date
- 2026-04-07
AI Technical Summary
Thin metal sheets are prone to twisting and deformation during impact tests, and the height of the impact center is difficult to guarantee, resulting in large deviations in the impact energy absorption test results.
The thin metal sheet was cut into multiple impact samples and fixed with metallographic section clips. The samples were then embedded in a cold mounting mold, cured with cold mounting resin, and notches were machined into the samples. An overall impact test was conducted, the total absorbed energy was recorded, and the absorbed energy of each individual sample was calculated.
This ensures that the specimen does not twist or deform during the impact test and that the impact center is accurately positioned, thus improving the precision and accuracy of the test.
Smart Images
Figure CN121805045A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a method for testing the impact performance of thin plates, belonging to the field of metallurgical testing technology in the metallurgical industry. Background Technology
[0002] Based on market applications and customer processing requirements, it is necessary to test the impact absorption energy of thin metal sheets, especially cold-rolled thin sheets. Thin metal sheets are typically less than 2mm thick. During impact testing, due to insufficient rigidity, they may twist and deform, and the impact center height of the specimen is difficult to guarantee. Consequently, the impact absorption energy of thin sheets is low, falling below the lower limit of the accuracy of the impact testing machine. These factors lead to large deviations in the impact absorption energy test results for thin metal sheets. Summary of the Invention
[0003] The purpose of this invention is to provide a method for testing the impact performance of thin plates, which can ensure that the sample does not twist or deform during the impact test, that the impact center of the sample is in a suitable position, that the impact energy absorbed is within the accuracy of the testing machine, and that the detection deviation is small, thus solving the problems existing in the background art.
[0004] The technical solution of this invention is: A method for testing the impact performance of thin plates includes the following steps: Step 1: Cut the thin metal sheet into multiple identical impact samples; Step 2: Align multiple impact samples and fix the two ends of the multiple impact samples together with metallographic section clamps to form a single sample; Step 3: Place one end of the sample, along with the metallographic section clip, vertically into the square cold mounting mold. Pour the prepared cold mounting resin into the mold, and remove it after curing. Step 4: Insert the other end of the sample as in Step 3; Step 5: Machine a V-shaped or U-shaped notch in the middle of the sample; Step 6: Perform an overall impact test on the mounted specimen using an impact testing machine, and record the total impact absorbed energy. The impact absorbed energy of a single impact specimen is equal to the total impact absorbed energy divided by the number of impact specimens.
[0005] In step one, the number of impact samples is determined by their thickness, and the thickness of the sample formed by stacking multiple impact samples together is less than 10 mm.
[0006] In step one, the length of the impact sample is 55mm ± 0.6mm and the width is 10mm ± 0.075mm.
[0007] The metallographic section clamp has two circular rings at both ends.
[0008] The metallographic slice clamp is made of PET-acrylic, with a width of 8mm±1mm and a diameter of 2mm±0.5mm for the two end rings.
[0009] In step three, the cold-mounting mold is a soft film made of silicone, with internal dimensions of 15mm±0.5mm in length, 10mm±0.11mm in width, 15mm±2mm in height, and 2mm±0.5mm in thickness.
[0010] In step three, the cold mounting resin is CMR1 cold mounting king, and the curing time is 15min ± 5min.
[0011] In step five, the V-shaped or U-shaped notch processed in the middle of the sample is located on the side closest to the edge of the cold-mounted resin.
[0012] The beneficial effects of this invention are: this invention is simple to operate and highly operable. By stacking and embedding multiple samples, the rigidity of the samples is increased, the impact center position of the samples is appropriate, and it can realize the impact test of ultra-thin samples without torsion deformation. Moreover, the accuracy of the impact value is improved after stacking, making the results of a single sample more accurate. Attached Figure Description
[0013] Figure 1 Image showing the metallographic section clamp holding the sample in place; Figure 2 Drawing of a square cold-fitting mold; Figure 3 To create a mosaic of superimposed impact samples; Figure 4 Top view of the cold inlay molding process; Figure 5 A notch diagram for the inlaid, superimposed pattern; In the diagram: 1. Square cold mounting mold; 2. Upper metallographic section clamp; 3. Lower metallographic section clamp; 4. Cold mounting resin; 5. Impact sample. Detailed Implementation
[0014] The invention will be further described below with reference to the accompanying drawings and examples.
[0015] See attached document Figure 1-5 A method for testing the impact performance of thin plates, comprising the following steps: Step 1: Cut the thin metal sheet into multiple identical impact samples 5; Step 2: Align the multiple impact samples 5, and fix the two ends of the multiple impact samples 5 together with metallographic section clamps to form a sample; Step 3: Place one end of the sample along with the metallographic slice clamp vertically into the square cold mounting mold 1, pour the prepared cold mounting resin 4 into the mold 1, and remove it after curing. Step 4: Insert the other end of the sample as in Step 3; Step 5: Machine a V-shaped or U-shaped notch in the middle of the sample; Step 6: Use an impact testing machine to conduct an overall impact test on the embedded specimens and record the total impact absorbed energy. The impact absorbed energy of a single impact specimen 5 is equal to the total impact absorbed energy divided by the number of impact specimens 5.
[0016] In this embodiment, refer to the appendix Figure 1-5 The length of impact sample 5 is 55mm ± 0.6mm and the width is 10mm ± 0.075mm. The number of impact samples 5 is determined by their thickness. The thickness of the sample formed by stacking multiple impact samples 5 together is less than 10mm.
[0017] The metallographic section clamp is made of PET-acrylic, with a width of 8mm±1mm and two circular ends with a diameter of 2mm±0.5mm.
[0018] The cold-mounting mold 1 is a soft film made of silicone, with internal dimensions of 15mm±0.5mm in length, 10mm±0.11mm in width, 15mm±2mm in height, and 2mm±0.5mm in thickness.
[0019] The cold mounting resin 4 is CMR1 cold mounting king, with a curing time of 15min ± 5min.
[0020] The V-shaped or U-shaped notch processed in the middle of the sample is on the side closest to the edge of the cold-mounted resin 4. Example 1
[0021] In this embodiment 1, the steel grade is T170P1, the plate thickness is 1.0 mm, the V-notch depth is 2 mm, the test temperature is 20℃, the Charpy V-notch impact tester is used, the blade radius is 2 mm, and the range of the impact tester is 100 J.
[0022] The testing steps for the impact performance of thin plates are as follows: (1) Select a flat part of the T170P1 thin plate and process it into 6 impact samples along the longitudinal direction using wire cutting. The wire cutting process ensures that the surface of the sample remains flat after processing. The sample is a non-standard sample with a length of 55mm and a width of 10mm. (2) Align multiple impact samples 5 and fix both ends with a circular PET-acrylic upper metallographic section clamp 2 and lower metallographic section clamp 3, with a diameter of 2mm and a height of 8mm; (3) Place one end of the metallographic slide clamp 2 vertically into the square cold mounting mold 1, and make the side without the metallographic slide clamp 2 stick to the mold, with the thickness direction centered. Pour the prepared cold mounting resin 4 CMR1 cold mounting king into the silicone soft film mold 1 with a length of 15mm, a width of 10mm, a height of 15mm and a thickness of 2mm. After curing for 14 minutes, take it out. (4) When placing the sample, the sides with the upper metallographic slice clamp 2 and the lower metallographic slice clamp 3 should be on the same side. (5) Use a notching machine to cut a V-shaped notch in the middle of the sample. The depth of the V-shaped notch is 2mm, and the notch side is the side close to the edge of the cold-mounted resin 4. (6) The entire impact test was performed on the embedded specimen using an impact testing machine. The total impact absorption energy was 32.2 J. The impact absorption energy of a single specimen was equal to the total impact absorption energy of 32.2 J divided by the number of specimens 6, which equals 5.37 J.
[0023] The T170P1 thin plate has an impact absorption energy of 5.37 J at room temperature (20°C).
[0024] Example 2 In this embodiment 2, the steel grade is T170P1, the plate thickness is 1.5mm, the V-notch depth is 2mm, the test temperature is -20℃, and the testing machine used is a Charpy V-notch impact tester with a blade radius of 2mm and a range of 100J.
[0025] The steps for testing the impact performance of thin plates are as follows: (1) Select a flat part of the T170P1 thin plate and process it into 5 impact samples along the longitudinal direction using wire cutting. The wire cutting process ensures that the surface of the sample remains flat after processing. The sample is a non-standard sample with a length of 55.24 mm and a width of 10.022 mm. (2) Align multiple impact samples 5 and fix both ends with a circular PET-acrylic upper metallographic section clip 2 and lower metallographic section clip 3, with a diameter of 2.5 mm and a height of 9 mm; (3) Place one end of the metallographic slide clamp 2 vertically into the square cold mounting mold 1, with the side without the metallographic slide clamp 2 pressed against the mold and the thickness direction centered. Pour the prepared cold mounting resin 4 CMR1 cold mounting king into the silicone soft film mold 1 with a length of 15.30mm, a width of 10.08mm, a height of 17mm, and a thickness of 2.20mm. Remove it after curing for 17 minutes. (4) When placing the sample, the upper metallographic section clip 2 and the lower metallographic section clip 3 should be placed on the same side. (5) Use a notching machine to make a V-shaped notch in the middle of the sample. The depth of the V-shaped notch is 2mm, and the notch side is the side close to the edge of the cold-mounted resin 4. (6) After the inlaid sample is placed in the low temperature bath and kept at -20℃ for 8 minutes, it is taken out and subjected to an overall impact test using an impact testing machine. The total impact absorption energy is 23.3J. The impact absorption energy of a single sample is equal to the total impact absorption energy of 23.3J divided by the number of samples 5, which equals 4.66J.
[0026] The T170P1 thin plate absorbs 4.66 J of impact energy at a low temperature of -20℃.
Claims
1. A method for testing the impact performance of thin plates, characterized in that: Includes the following steps: Step 1: Cut the metal sheet into multiple identical impact samples (5); Step 2: Align multiple impact samples (5) and fix the two ends of multiple impact samples (5) together with metallographic section clamps to form a sample; Step 3: Place one end of the sample along with the metallographic slice clamp vertically into the square cold mounting mold (1), pour the prepared cold mounting resin (4) into the mold (1), and remove it after curing; Step 4: Insert the other end of the sample as in Step 3; Step 5: Machine a V-shaped or U-shaped notch in the middle of the sample; Step 6: Use an impact testing machine to perform an overall impact test on the embedded specimens and record the total impact absorbed energy. The impact absorbed energy of a single impact specimen (5) is equal to the total impact absorbed energy divided by the number of impact specimens (5).
2. The method for testing the impact performance of thin plates according to claim 1, characterized in that: In step one, the number of impact samples (5) is determined by their thickness, and the thickness of the sample formed by stacking multiple impact samples (5) together is less than 10 mm.
3. The method for testing the impact performance of thin plates according to claim 2, characterized in that: In step one, the impact sample (5) has a length of 55mm ± 0.6mm and a width of 10mm ± 0.075mm.
4. The method for testing the impact performance of thin plates according to claim 1, characterized in that: In step two, the two ends of the metallographic slice clamp are circular.
5. The method for testing the impact performance of thin plates according to claim 4, characterized in that: The metallographic slice clamp is made of PET-acrylic, with a width of 8mm±1mm and a diameter of 2mm±0.5mm for the two end rings.
6. The method for testing the impact performance of a thin plate according to claim 1, characterized in that: In step three, the cold inlay mold (1) is a soft film made of silicone, with an internal dimension of 15mm ± 0.5mm in length, 10mm ± 0.11mm in width, 15mm ± 2mm in height, and 2mm ± 0.5mm in thickness.
7. The method for testing the impact performance of thin plates according to claim 1, characterized in that: In step three, the cold mounting resin (4) is CMR1 cold mounting king, and the curing time is 15min±5min.
8. The method for testing the impact performance of thin plates according to claim 1, characterized in that: In step five, the V-shaped or U-shaped notch processed in the middle of the sample is on the side close to the edge of the cold-mounted resin (4).