Method and test device for mechanically controlling object surface/interface adhesion strength

Abstract

The invention discloses a method and test device for mechanically controlling the object surface / interface adhesion strength. According to the method in the invention, on the premise of being independent of an object surface micro-structure, two object surfaces having the adhesion effect are contacted together, so that a contact pair is formed; two objects of the contact pair are stimulated to perform relative mechanical vibration; therefore, the contact area of the contact pair changes over time; and the object surface / interface adhesion strength is controlled by changing the excitation frequency or the amplitude. The method is simple to implement and high in controllability; the method is independent of the surface / interface micro-structure, and has universality; the adhesion strength control effect is obvious; and the fact that the contact interface adhesion strength is greatly increased or decreased can be realized.

Description

technical field [0001] The invention relates to a method and a test device for mechanically regulating the surface / interface adhesion strength of an object. Background technique [0002] Adhesion is one of the most common phenomena in nature, and its performance has been continuously optimized in the long-term biological evolution. For example, the hierarchical structure on the feet of geckos, beetles, and tree frogs not only shows strong adhesion-detachment properties, but also has strong environmental adaptability, stability, and durability. In human life, adhesion is also widely used in various fields, such as band-aids, tapes, and the contact between various materials, and even small molecules in human blood adhere to the blood vessel wall to heal wounds. The excellent functional properties in these biological systems have inspired a lot of biomimetic biosurface / interface design adhesion system research. The artificial formation and regulation of high-performance surfa...

AI Technical Summary

Problems solved by technology

[0003] Although significant progress has been made in improving adhesive strength, adhesive switching, reversibility, and durability, it is noted that most biomimetic artificial tables / interfaces are characterized by high complexity, poor versatility, and low cost-effectiveness. / interface does not benefit humanity very well

For example, reports have shown that the adhesion strength of artificial layered adhesion systems is as high as 200kPa, which is higher than that of nature (the adhesion strength of gecko feet is 100kPa), but it usually requires the prefabrication of complex surface / interface microstructures and the application of high pre-treatment. pressure

In addition, the surface / interface microstructure is susceptible to environmental and surface / interface inherent forces, thereby affecting its durability

Adhesion-desorption switching is achieved by changing the load path and failure mode of the interface, forming a "smart / phase change" interface or controlling the desorption speed, but most current technologies can only achieve "strong" or "weak" Switching between two sticky states with inherently limited switching speed

[0004] To sum up, as a key technology to improve human survivability and technological level, adhesion is still a great challenge to its application. The main difficulty lies in how to implement and control the interface stability, durability, universality and economy based on modern industrial technology. adhere to

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