A method for testing mechanical properties of flexible film materials based on wetting behavior

By observing the wetting behavior of droplets on the surface of a flexible film and combining it with a four-force equilibrium model, the shear modulus of the flexible film is calculated. This solves the problems of insufficient resolution and operational difficulties in existing testing methods, and achieves efficient and accurate mechanical property evaluation.

CN116465794BActive Publication Date: 2026-05-29SOUTHWEAT UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SOUTHWEAT UNIV OF SCI & TECH
Filing Date
2023-04-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing methods for testing the mechanical properties of flexible thin film materials suffer from insufficient equipment resolution, operational difficulties, and inaccurate testing, making it difficult to effectively assess their minute stresses and strains.

Method used

By observing the dynamic wetting behavior of droplets on the surface of a flexible polymer film, and utilizing the changes in the shape and height of the wetting ridges, combined with a four-force equilibrium model at the contact line, the shear modulus of the material was calculated.

Benefits of technology

A simple and accurate testing method is provided, which can calculate the material modulus by measuring the wetting parameters, avoiding excessive deformation of the sample, reducing the testing cost, and simplifying the experimental steps.

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Abstract

The application is a method for testing mechanical properties of flexible film material based on wetting behavior, which can be used for measuring modulus of flexible polymer film material. The method is to obtain contact angle and wet ridge height value of liquid drop on soft substrate surface at different time through high-definition optical camera contact angle test platform and white light interference three-dimensional profile scanner. Theoretical relationship between wetting parameters and material mechanical properties when wet ridge grows to maximum height in wetting process is analyzed by means of four force balance model at three-phase contact line. Modulus of flexible wetting substrate can be estimated by measuring three-phase interface contact angle θ lv , θ sv , θ ls and maximum height value h max of wet ridge. The experimental method shown in the application can obtain mechanical properties of flexible film material by measuring only surface wetting parameters of the flexible film material, so that the testing process with difficult operation and large error is saved. The experimental method is simple, convenient to operate and accurate in result.
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