Round pipe with axial stress pipe wall changing and design method thereof

Abstract

The invention discloses a round pipe with the axial stress pipe wall changing and a design method thereof. The method comprises two-dimensional model design with the negative poisson ratio and round pipe size design; the round pipe longitudinal section is the two-dimensional model with the negative poisson ratio effect; the two-dimensional module is located on the XOZ plane of the space right-angle coordinate system and has the negative poisson ratio effect in the X and Z directions; the axis that is the rotating axis L of the round pipe is in the XOZ plane and is parallel to the Z axis; the distance, that is the round pipe inner diameter D, between the rotating axis L and the two-dimensional model meets the formula that D is larger than zero; and the two-dimensional model rotates around the rotating axis L by 360 degrees. The round pipe is verified to have the pressing (pulling) thinning (thicknening) characteristics, the brand-new road is developed for research and application of thenegative poisson ratio material, and the profound influence is achieved.

Description

technical field [0001] The invention relates to designing a circular tube with a changing wall under axial force by designing a tubular structure with a negative Poisson's ratio effect, and proposes a design method for a circular tube with changing wall under axial force. It belongs to the field of new materials and new structures. Background technique [0002] Negative Poisson's ratio materials and structures have unusual mechanical properties. Unlike traditional materials that expand and contract, negative Poisson's ratio materials undergo lateral contraction (expansion) under uniaxial pressure (tension). Negative Poisson's ratio materials have many ideal properties, such as: large shear modulus, good fracture toughness, good fatigue durability, high energy absorption efficiency, and less prone to dents, etc., which have more advantages than traditional materials. These excellent properties make negative Poisson's ratio materials have increasingly broad application prospe...

AI Technical Summary

Problems solved by technology

However, most of the existing literature is on the study of two-dimensional negative Poisson's ratio materials

Three-dimensional negative Poisson's ratio materials are mostly porous structures with complex internal structures

The backward manufacturing technology in the past made the practical application of three-dimensional negative Poisson's ratio materials rare

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