Method for constructing skin nonlinear constitutive model under action of compression load

Abstract

The invention discloses a method for constructing a skin nonlinear constitutive model under the action of a compression load. The method comprises the following steps: establishing an improved Odgen model as a skin hyperelastic part model; establishing a Maxwell model as a relaxation unit to describe a relaxation phenomenon caused by skin viscoelasticity; establishing a standard three-parameter solid model as a creep unit to describe a creep phenomenon caused by skin viscoelasticity; by introducing a strain rate function, a specific model capable of describing skin mechanical behaviors under the strain rate of 10 <-4 > / s-10 < 3 > / s is established; by utilizing the pigskin nonlinear constitutive model provided by the invention, the strain rate sensitivity of the pigskin and relaxation and creep phenomena caused by viscoelasticity of the pigskin can be captured, and a foundation is laid for subsequent modeling and simulation of skin materials.

Description

technical field [0001] The invention relates to the technical fields of computational mechanics and experimental mechanics, in particular to a component method of a nonlinear constitutive model of skin under compressive load. Background technique [0002] Skin is a biomaterial composed of the epidermis, papillary dermis, and reticular dermis, exhibiting highly nonlinear, strain-rate-sensitive, hyperelastic and viscoelastically induced relaxation properties, creep properties. Under compressive load, the mechanical properties of the internal structure of this material will continue to change. The study of the constitutive relationship of the skin has always been one of the focuses of skin mechanics research, and it is an important basis for establishing a real human body finite element model during the penetration process. It is an urgent need in engineering and scientific research to obtain a constitutive model that can accurately describe the mechanical properties of skin ma...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of construction method of the skin nonlinear constitutive model under the action of compressive load, to solve the existing skin constitutive model can't well fit the skin compression experiment curve under different strain rates at the same time (i.e. Fitting accuracy is low), the problem of low reliability of the model

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