Definition
The interlayer peel strength tester is a special equipment used to determine the resistance and separation ability of the bond interface between layers in composite materials or laminated structures. It simulates the interlayer peeling process to quantitatively evaluate the adhesion properties of materials under specific conditions, providing key data for product quality control and process optimization.
How it works:
The device is based on the principle of mechanical equilibrium and usually uses a 180 or 90 degree peel test method. The specimen is fixed on the fixture at a specific angle, and the upper gripper performs the peeling movement at a constant rate, while the sensor records the change in force value during the peeling process in real time. The peel force is collected by the force value sensor, the displacement data is measured by the encoder, and the system software calculates the average peel force and peel strength according to the standard algorithm. The formula for calculating peel strength can be expressed as:
σ = F / b
where σ represents the peel strength, F is the average peel force, and b is the width of the specimen.
Measurement method
The standard measurement process follows relevant industry specifications, such as ASTM D903, GB/T 2792, etc. Standard-sized specimens are first prepared, typically 25 mm wide. The unbonded end of the specimen is separated and loaded into the upper and lower fixtures to ensure that the peeling angle meets the standard requirements. Set the test parameters including peeling speed, sampling frequency, etc., and the equipment will automatically complete the peeling process after starting the test. When processing the data, the outliers of the initial and end segments are usually removed, and the average force values of the stable peeling stage are taken to calculate, and the final report includes the maximum force, minimum force, average force and peel strength curve.
Influencing factors
Test results are influenced by a variety of factors. The material side includes the quality of the surface treatment of the substrate, the uniformity of the type of adhesive and coating, and the curing process conditions. In terms of test conditions, the change of peeling speed may affect the response of molecular chain segments, and the ambient temperature and humidity will affect the mechanical state of the material. Operational factors such as sample preparation accuracy, fixture neutralization, peeling angle deviation, etc. will also introduce measurement variations. Equipment factors involve sensor accuracy level, control system stability, data acquisition frequency, etc.
Applications:
This device has a wide range of applications in several industrial fields. The packaging industry is used to evaluate the composite strength of flexible packaging materials to ensure seal reliability. The electronics industry tests the interlayer bonding of flexible circuit boards to ensure product durability. The automotive industry tests the adhesive properties of interior materials to meet safety standards. The textile industry measures the adhesion of coatings on functional fabrics and controls product quality. In the field of building materials, the composite performance of waterproof membranes and insulation materials is evaluated to ensure the safety of the project.
Key points of selection
Equipment selection should comprehensively consider technical parameters and usage needs. The force range should cover the expected test range with appropriate margins, usually choosing a maximum test force between 500 Newtons and 5000 Newtons. The displacement transition must meet the maximum specimen length requirements. The control system should support a variety of standard test methods, and the software should have real-time curve display and standard data analysis functions. In terms of accuracy, the force value accuracy is usually required to reach ±0.5% of the indicated value, and the displacement accuracy reaches ±0.1 mm. Scalability considerations include fixture compatibility, environmental chamber interfaces, data export formats, and more. The use environment requires clarifying the power supply conditions, space size, and temperature and humidity range of the laboratory.