Multi-face inner-sunken pyramid-shaped negative poisson ratio space dot matrix structure and pressure bearing plate thereof

Abstract

The invention belongs to the field of pressure resistance or pressure bearing or supporting structures and particularly relates to a multi-face inner-sunken pyramid-shaped negative poisson ratio spacedot matrix structure and a pressure bearing plate thereof. Based on the multi-face inner-sunken pyramid-shaped negative poisson ratio space dot matrix structure, the pressure-resistant or pressure-bearing structure made of an elastic material and used for supporting can be used, the overall pressure-resistant and pressure-bearing capacity is improved, and the structural damage is avoided; and based on the multi-face inner-sunken pyramid-shaped negative poisson ratio space dot matrix structure, the pressure-bearing structure (bridges, flat plates and the like) made of an elastic material or aplastic material and provided with the two ends being constrained can be used, in the middle pressure bearing process, auxiliary supporting lines located on the upper and lower supporting faces can resist thinning of the section of the pressure-bearing structure, breaking of the pressure-bearing structure is prevented, and the pressure-bearing capacity is improved; and based on the multi-face inner-sunken pyramid-shaped negative poisson ratio space dot matrix structure, a protection reinforcing and buffering structure made of a plastic material can be used, the characteristics of small weightand high strength are achieved, and the problems of instantaneous impact damage, reduction of follow-up bearing capacity of a buffering structure and the like are effectively avoided.

Description

technical field [0001] The invention belongs to the field of pressure-bearing or supporting structures, and in particular relates to a multifaceted concave pyramid-shaped negative Poisson's ratio space lattice structure and a pressure-bearing plate frame. Background technique [0002] Among our common materials, the range of Poisson's ratio (Poisson's ratio) is mostly between 0 and 0.5, while the Poisson's ratio of most materials is between 0.2 and 0.4. Nevertheless, there are still a few materials with negative Poisson’s ratio, for example, the Poisson’s ratio of single crystal pyrite is -0.14. At the same time, from a theoretical point of view, the special nature of negative Poisson's ratio was proved by B.M.L in 1968 using the elastic strain energy theory, and the Poisson's ratio range of isotropic materials is -1<v<0.5. The Poisson's ratio range of anisotropic materials must comply with: v ij ≤(E i / E j ) / 2 and v ij E. j =v ji E. i conditions of. When a co...

AI Technical Summary

Problems solved by technology

For example, a negative Poisson's ratio structural component with application number 201310566039.5 provides a negative Poisson's ratio structure for bushings, suspensions, and buffer blocks, etc., which has better load stiffness and dynamic characteristics, but its structure is simple , the overall load capacity is limited, and it is only suitable for load handling in a single direction, and cannot be well applied in complex stress environments

[0003] The pressure-bearing plate frame is a structure that is often involved in daily life. It is used in various aspects such as buffering and protection. For the purpose of reducing structural quality and improving structural performance, people have designed a variety of products and structures. The needs of people and the continuous improvement of people's requirements for product performance, the existing structure or product performance or use experience is increasingly unable to meet the user's requirements, especially the traditional pressure plate designed or manufactured by the principle of overall elastic deformation The frame has large deformation and low ultimate load after being stressed. Once its deformation or bearing capacity is exceeded, structural or material damage will occur. At the same time, the load cannot be effectively distributed when the structure is partially stressed. Therefore, commonly used pressure-bearing structures and Products often have problems such as local or internal structural material extrusion deformation and damage. In order to solve the above problems, people have proposed many structures with negative Poisson’s ratio properties inspired by the negative Poisson’s ratio. The negative Poisson's ratio structure used in other applications such as vehicles has the characteristics of light weight, low cost, and good nonlinear dynamic response, but it is mainly used to improve the pressure-bearing deformation capacity in a single direction, and has good performance along the direction of the load force. However, it cannot cope with multi-directional stress, and the strength of the mechanism is low, and the deformation is too large when the force is applied, which has a certain adverse effect on the stability of the bearing surface; the application number is 201610928511.9, which is used in chemical, medical, military and other fields. Three-dimensional negative Poisson's ratio periodic porous material, which has multi-phase negative Poisson's ratio characteristics and energy dissipation and sound absorption effects, but due to its structural characteristics, in the process of stress, the cross of the upper and lower layers of the first type of monomer structure The structures will approach each other, and the surrounding arc structures will bend inward, while the upper and lower cross structures of the second type of single structure will move away from each other, and the arc structures will bend outward, resulting in the direction of structural changes between layers and The amount of deformation is different. The first type of cross structures close to each other has insufficient space for deformation due to their close spacing, and the first type of single structure is prone to internal collision, while the second type of single structure is still relatively large. Inhomogeneity of the deformation space, in practical application, the interaction force of multi-layer structural parts is complex, and the load distribution is uneven. And the difference in utilization rate between the layers is too large, the structure is deformed and the force is uneven, and all resources cannot be effectively used. Therefore, the expected technical effect cannot be better achieved under the condition of large load and complex load conditions.

Images