Research on Tensile Testing of Composite Laminates

Abstract Summary: This article introduces the use of the Kunpeng BOYI 2025 electronic universal testing machine and pneumatic foil-specific fixtures, referring to standards "GB/T 1040.1-2018 Plastics - Determination of tensile properties", "GB/T 1040.3-2006 Plastics - Determination of tensile properties Part 3: Test conditions for films and sheets", "GB/T 5230-2020 Electrolytic copper foil for printed circuit boards" as well as " YB/T 4334-2013 Metal foil - Room temperature tensile test method " ， for composite current collectors samples to conduct tensile tests research example. Evaluating composite current collectors the tensile strength, elongation at break and other mechanical properties 。

Keywords ： BOYI 2025 precision universal testing machine   copper composite current collector ( MC )  aluminum composite current collector ( MA )   tensile test

     Composite current collectors are a new type of current collector material combining polymer materials and metals. The structure is similar to a "sandwich" structure, with a base film (PP, PET, PI and other polymer materials) in the middle, and copper-plated or aluminum metal films on both outer layers. 。 Among them, copper composite current collector ( MC ) mainly used for battery cost reduction and weight reduction, even applicable to solid-state batteries. MC cost reduction ， At the same time, reduces battery weight thereby increasing energy density. Aluminum composite current collectors ( MA ) focus on safety and thinning, suitable for batteries with high safety requirements. Composite current collectors can effectively suppress lithium dendrite growth, cut off current during puncture, and prevent thermal runaway. The widespread use of composite current collectors has greatly promoted technological breakthroughs and market development in the new energy industry.

The Kunpeng testing machine is equipped with pneumatic double push-pull tensile fixtures, which can continuously provide constant clamping force during the test process. During tensile deformation and thinning of the sample, the the pneumatic fixture can always stably clamp the sample without slipping or detachment. No abnormal situations such as slipping occur; with a foot switch, it can achieve quick positioning and clamping before the test and return and replacement after the test, improving operational convenience and testing efficiency, greatly saving test time; meanwhile, because the current collector is very thin and lightweight, the Kunpeng fixture is equipped with a throttle valve to adjust the clamping speed, avoiding rapid clamping of the clamping surface causing airflow leading to sample relaxation, ensuring clamping perpendicularity and gauge length accuracy, avoiding clamping skewness affecting ， results. At the same time, the software has gauge length recognition and correction functions, which can correct the gauge length 。 after clamping relaxation to ensure elongation accuracy. Besides the fixture, the high precision of the testing machine mainframe and a sampling frequency exceeding 1000Hz can fully record all characteristic data during the tensile process, providing users with accurate and reliable test data. Coupled with intelligent testing software, it can simultaneously provide various test curves such as single sample, multiple samples, and dual coordinates, allowing different users to have a good interactive experience, safeguarding enterprise R&D, quality, and product control. Test section 1.1 Instruments and fixtures

1. BOYI 2025-001 electronic universal testing machine

N pneumatic double push-pull tensile fixture

Smartest software

1k 1.2 Analysis conditions

Test temperature: room temperature

about ℃

Load sensor: 23 1000N (0.5 grade)

Loading test rate: Fixture spacing

(original gauge length) 50mm/min

mm 1.3 Samples and treatment ：50 In this test, two pre-cut

composite current collector samples were selected, and their thickness was measured with a micrometer, approximately 0.007mm; and

本次试验，选取已裁切好的2款复合集流体试样，使用千分表测量其厚度，分别为 copper composite current collector ( MC )，厚度约为：0.007mm；和 aluminum composite current collector ( MA ), thickness approximately: 0.008mm , quantities each 5 pieces.

2. Test Introduction

Using BO YI 2025-001 electronic universal testing machine for the test, the cut samples are stably and vertically clamped in the upper and lower fixtures, select the appropriate air pressure, then use the software's preload function, at a rate of 10 mm/min ， to reach a preload of 0.1N, after which the testing machine automatically conducts the test, at a rate of perform tensile test at a rate of 50mm/min until the specimen breaks, during the measurement process, load and displacement data are recorded, and a tensile curve is generated. 。

3. Results and Conclusions

3.1 Test Results

  The specific test results are shown in Table 1.

From the above (Table 1) data and test curves, it can be seen that the specimen after using the preload function, the starting position shows no relaxation with a straight curve, load rises linearly with increasing displacement, , until the sample is stretched to fracture, the software can record the complete test curve throughout the process, and can obtain load , displacement deformation and other data for analysis. ， Automatically obtains the starting point and corrects the gauge length, making the elongation data more consistent with actual results. 。 The reproducibility and repeatability of the curve are good, from this test result it reflects the high precision and high stability of the Kunpeng BOYI 2025-001 electronic universal testing machine.

4. Conclusion

  The above test results indicate that the Kunpeng BOYI 2025-001 electronic universal testing machine, combined with pneumatic double push-pull tensile fixtures (polymer clamping surface) can fully meet the tensile testing requirements of composite collectors, with excellent data reproducibility and accuracy, capable of efficiently and effectively completing related tests. Through a high-precision, high-sampling-rate testing system, various mechanical data of composite current collectors can be obtained reliably and stably, which is very important for the technological development of composite current collectors and can provide data support and technical assurance for enterprise product development, quality management, as well as standardization and regulation in the industry.