Composite energy-absorbing structure based on square unit twinned micro-truss structure and its 3D printing method
An energy-absorbing structure, 3D printing technology, applied in the direction of manufacturing, additive processing, etc., can solve the problems of mechanical properties and reduced energy absorption, and achieve the effect of improving mechanical properties and excellent energy absorption performance
Active Publication Date: 2021-05-11
TONGJI UNIV
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Problems solved by technology
[0007] The purpose of the present invention is to provide a composite energy-absorbing structure based on a square unit twinned micro-truss structure and its 3D printing method, so as to solve the problems of existing single crystal materials such as reduced mechanical properties and absorbed energy.
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Embodiment 1
[0046] This embodiment provides a composite energy-absorbing structure based on a square-unit twinned micro-truss structure, using PLA material as a 3D printing material. For its structure, see Figure 3-Figure 4 As shown, it consists of several layers of twin-crystal micro-truss structures that are 3D printed layer by layer along the Z-axis direction. The lattice-type micro-truss structure composed of single-oriented two-dimensional lattice structural units is defined as a single-crystal micro-truss structure. , the twinned micro-truss structure consists of two parts of the twinned micro-truss region 2 with the middle line as the line of symmetry, and the two parts of the twinned micro-truss region 2 are composed of two left and right parts with the middle line as the line of symmetry The crystalline micro-truss structure is formed by rotating in opposite directions and at the same angle around the Z axis, and the two-dimensional dot array structure unit is a square unit 1 . ...
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Abstract
The invention relates to a composite energy-absorbing structure based on a square unit twinned micro-truss structure and a 3D printing method thereof. The composite energy-absorbing structure is composed of several layers of twinned micro-truss structures that are 3D-printed layer by layer along the Z-axis direction. The twin-crystal micro-truss structure consists of two parts of the twin-crystal micro-truss region with the middle line as the symmetry line, and the two-part twin-crystal micro-truss region consists of two left and right single-crystal micro-truss structures with the middle line as the symmetry line They are respectively formed by rotating around the Z axis in opposite directions and at the same angle, and the two-dimensional dot array structural unit is a square unit. Compared with the existing technology, on the basis of ensuring almost the same first peak value of compressive strength, the present invention ensures that the platform stress in the platform area is always maintained at a relatively high stress level by setting twin grain boundaries, so as to achieve light weight and high strength Structural goals, and ensure a very good energy absorption performance.
Description
technical field [0001] The invention belongs to the technical field of composite energy-absorbing structures, and relates to a composite energy-absorbing structure based on a square unit twinned micro-truss structure. Background technique [0002] Porous structures are ubiquitous in nature, such as animal bones, honeycomb structures, and plant stems. This special structure has many excellent mechanical properties, low density, light weight, good specific strength and specific stiffness. Due to its potential to be an ideal lightweight structural material, it has attracted widespread research in recent years. Porous structures include honeycomb materials, metal foam materials, and lattice materials, among others. Typically, the weight per unit volume of porous structures is only one-tenth that of other materials. [0003] Lattice-type micro-truss structure is a new type of ordered porous material composed of periodically arranged nodes and connecting rods. This new structur...
Claims
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IPC IPC(8): B29C64/10B29C67/20B33Y10/00B33Y80/00
CPCB29C67/20B33Y10/00B33Y80/00B29C64/10
Inventor 陆哲豪严鹏飞严彪
Owner TONGJI UNIV