Wood cross grain pressure-bearing constitutive relation model construction method and device based on wood weak phase structure, and storage medium

Abstract

The invention provides a wood cross grain pressure-bearing constitutive relation model construction method and device based on a wood weak phase structure, and a storage medium. The method comprises the steps that: the stress-strain relation of wood in the elastic stage is constructed according to the Hooke law of a transverse isotropic material; according to stress characteristics of wood cross grain pressure bearing, equivalent stress causing wood volume deformation in a wood cross grain plane and deviating stress causing wood shear deformation are separated, and a yield surface equation of an elastic-plastic stage in the wood cross grain plane based on the equivalent stress and the deviating stress is constructed; according to a non-correlation flow rule, a plastic flow equation in a wood cross grain plane is constructed; according to the evolutionary relationship of the yield stress along with strain during unidirectional compression of the wood and the relationship between the yield stress during unidirectional compression of the wood and the yield stress during bidirectional compression of the wood, a hardening equation in a wood cross grain plane is constructed; and a stress-strain relationship in a wood rift-grain plane is constructed. The invention can better simulate the compression deformation of the volume when the cross grain of the wood is pressed.

Description

technical field [0001] The disclosure belongs to the technical field of wood science and engineering structure simulation, and in particular relates to a construction method, device and storage medium of a wood transverse grain pressure-bearing constitutive relation model based on wood weak phase structure. Background technique [0002] Wood is a kind of biomass material. Its complex mechanical properties are reflected in brittle failure under tension or shear force, plastic deformation under pressure, and different tensile and compressive strengths. At the same time, wood also has creep, mechanical adsorption, and fracture. , load duration effect and other characteristics. [0003] The constitutive relationship model of wood is a mathematical expression describing the relationship between wood stress, strain, time, etc., generally including the stress-strain relationship in the elastic stage, strength criteria, hardening, softening, and plastic development rules. In terms ...

AI Technical Summary

Problems solved by technology

[0006] For this reason, the first aspect of the present disclosure can consider the phenomenon of large deformation and secondary hardening of wood during compression, and can better simulate the compression deformation of the volume of wood when the transverse grain is

Images