Design method of incision tip shape for soft metamaterials

Abstract

The invention discloses a method for designing the shape of the incision tip of a soft metamaterial, which includes establishing a simulation model, establishing a simulation model, and performing cubic spline curve simulation; generating an initial population, based on the simulation model, randomly generating N binary values, and expressing them through the binary values The individuals constitute the initial population; calculate the individual fitness, calculate the maximum stress value of the soft metamaterial cell corresponding to each individual, and measure the individual fitness according to the principle of the minimum maximum stress value; update the population, and perform selection, crossover and mutation in sequence Genetic operation, generate the next generation population, make the population evolve forward, and update the population; output the result, set the stop condition, and output the result when the stop condition is met; the invention is based on finite element calculation software and genetic algorithm, and proposes a soft metamaterial incision Optimization methods and ideas, and reduce the stress at the tip of the incision through optimization algorithms to improve the tensile properties of soft metamaterials.

Description

technical field [0001] The invention relates to the field of soft metamaterial design, in particular to a method for designing the shape of a soft metamaterial incision tip. Background technique [0002] Soft metamaterials with periodically arranged slits distributed in elastomers such as rubber materials have extraordinary mechanical properties, such as negative Poisson's ratio effect, large tensile properties, and programmable force-deformation relationships. Due to the designability of the slit, ease of production, and huge design space, this slicing soft metamaterial has recently attracted widespread attention and has broad application prospects in electronic devices, phononic crystals, medical devices, and other fields. [0003] At present, in order to improve the mechanical properties of soft metamaterials, the shape and arrangement of the incisions in soft metamaterials are generally designed. However, the geometry of the incision tip has a significant impact on the m...

AI Technical Summary

Problems solved by technology

Under tension, the incision tip of the soft metamaterial will bear very large stress due to the stress concentration and produce huge deformation, which limits the further stretching of the material and may lead to fracture at the incision tip

The performance of soft metamaterials can be improved through structural optimization, but due to the strong nonlinearity of the material and large deformation, there is still little research on the optimization method of the incision tip.

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