Multi-level micro-nano mechanical structure for enhancing damage resistance of functional surface

Abstract

The invention discloses a multi-level micro-nano mechanical structure for enhancing damage resistance of a functional surface. The multi-level micro-nano mechanical structure comprises a micro-nano composite structure functional layer, an interconnection network structure functional layer and a mechanical artificial structure functional layer which are connected; the micro-nano composite structure functional layer is of a micro-column array structure which plays a surface function, the interconnection network structure functional layer is of a hard phase and soft interconnection structure, the hard phases are connected through soft phase materials to form an unstable parallelogram, and under the action of plane stress at the tail ends of micro-columns, spontaneous rotation or reconstruction is achieved, and apparent numerical values of stress and strain at the tail ends of the micro-columns are reduced; the mechanical artificial structure functional layer is of an array structure composed of reconfigurable artificial lattices with mechanical properties, and through time-space domain reconstruction of the artificial lattices, a stress transfer path and strain energy density are optimized, and stress concentration of a functional surface is reduced. According to the invention, a dynamic structure is introduced, the damage tolerance of the surface functional layer is improved, the service cycle of the functional surface is prolonged, and the performance of the functional surface is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of functional surfaces with micro-nano structures, and in particular relates to a multi-level micro-nano mechanical structure for enhancing the damage resistance of functional surfaces. Background technique [0002] Constructing micro-nano-scale structures on the surface of materials helps to improve the surface function of materials, regulate the interface state of materials, and form functional surfaces that meet different needs. Automobiles, microelectronics, new energy and other fields have broad application prospects. [0003] However, during the service process, under the action of external loads, such as particle wear, drop impact, fluid shear, etc., limited by the mechanical properties and structural characteristics of the structure, the functional surface will show a local excessive stress or strain state , resulting in excessive local pressure and stress concentration, leading to mechanical failur...

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Problems solved by technology

[0003] However, during the service process, under the action of external loads, such as particle wear, drop impact, fluid shear, etc., limited by the mechanical properties and structural characteristics of the structure, the functional surface will show a local excessive stress or strain state , resulting in excessive local pressure and stress concentration, leading to mechanical failures such as collapse and fracture of the structure

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