Definition
The interlayer peel strength meter is a specialized testing equipment used to determine the resistance to separation between adjacent layers in composite or laminated structures. The measurement results are usually expressed as peel force per unit width, which is one of the key indicators for evaluating the bonding properties of material interfaces.
How it works:
The instrument is based on the principle of mechanical equilibrium, which fixes the adjacent layers of the specimen separately by means of a fixture, and applies a tensile force perpendicular to the interlayer direction at a constant rate. The sensor records the change of force value during the peeling process in real time, and the average peeling force is calculated by integral calculation combined with the displacement data. The stripping process typically follows the following mechanics:
F = (1/b) ∫ F(x) dx
where F represents the average peel force, b is the width of the specimen, F(x) is the instantaneous peel force, and x is the peel displacement.
Measurement method
The standard measurement process includes four stages: sample preparation, equipment calibration, test execution and data processing. The specimen should be cut to standard size, and the peeling end should be pre-separated. During the test, the fixture is separated at a specified rate, and the system automatically collects the force-displacement curve. During data processing, the initial peak and end outliers should be removed, and the average force value of the stable peeling stage should be taken for calculation. Different standard systems have specific regulations on specimen size, peeling rate and pretreatment conditions.
Influencing factors
The measurement results are influenced by multiple factors: the interfacial properties of the material itself are intrinsically determinants; The quality of sample preparation directly affects the reliability of the data, including the consistency of cutting accuracy and pre-separation. Environmental conditions such as temperature and humidity will affect the state of the adhesive and the deformation of the material. The parameter setting of the instrument, especially the peel rate, will affect the dynamic response characteristics. The clamp design should ensure that the force is aligned and there is no additional torque.
Applications:
The instrument is used in the packaging materials industry to evaluate the bonding properties of composite films. In the field of electronic materials, the peel strength of flexible circuit substrates is measured; In the building materials industry, the bonding durability of the decorative layer and the substrate is tested; Evaluate the interlayer bond quality of interior materials in the automotive industry; Test the interfacial properties of composite fabrics in the textile sector. In addition, it is widely used in quality inspection institutions, scientific research institutes and production enterprises.
Equipment selection
When selecting a model, the measurement range and accuracy requirements should be confirmed first to ensure that the range and resolution of the force sensor meet the standard regulations. The stripping rate range must cover the relevant standard requirements. The fixture system should be adapted to common specimen types and have an anti-deflection design. The frequency of data acquisition affects the ability to present curve details. Software functions need to support multi-standard test programs and automatic calculations. Rigidity, alignment accuracy and long-term stability of equipment are the basic conditions to ensure data repeatability. Additionally, compatibility with extended features such as the environment chamber interface should be considered.