An interpenetrating phase composite structure based on shape memory programming skeleton and its manufacturing method

Abstract

The present invention discloses an interpenetrating phase composite structure based on a shape memory programming skeleton and a manufacturing method thereof. The manufacturing method comprises the following steps: 3D printing a matrix material with shape memory to form a porous structure; performing pre-deformation programming on the porous structure to obtain a pre-programmed porous structure; using the pre-programmed porous structure as a skeleton, filling the skeleton with a filling phase, and forming an interpenetrating phase composite structure with a shape memory programming skeleton after the filling phase reacts and solidifies; changing the reaction and curing conditions of the filling phase in the interpenetrating phase composite structure and the stimulation of the skeleton shape memory to achieve regulation of the deformation behavior of the interpenetrating phase composite structure during the shape memory process; the present invention significantly improves the controllability of the thermal expansion of the composite material and its adaptability to the thermal environment, can solve the problems of excessive thermal expansion of conventional materials and mismatched thermal deformation between different materials, enhances the adaptability of the material in different thermal environments, and provides guarantee for the reliability and safety of the equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of marine civil engineering seismic test research, and in particular to an interpenetrating phase composite structure based on a shape memory programming skeleton and a manufacturing method thereof. Background Art

[0002] Marine civil engineering construction addresses the significant demands of safeguarding maritime rights and interests, ensuring maritime safety, developing the marine economy, exploiting marine resources, and promoting marine industries. The core of marine civil engineering construction is how to construct civil engineering structures that meet various requirements in complex marine environments and maintain their normal operation and use. Undersea earthquakes are a typical example of marine loads that are highly hazardous to marine civil engineering structures. Seismic waves propagating through rock, soil, and water can cause vibration and deformation of the seabed, potentially triggering submarine landslides and debris flows, or leading to instability and damage to the foundations of marine structures. They can also trigger tsunamis that directly impact marine structures, damaging or destroying them.

[0003] Currently, most existing deep-sea seismic simulation devices are aboveground. Specifically, a deep-sea environmental simulation tank is constructed, with the specimen placed in the upper chamber. The vibration simulation device's actuator is installed in the tank's floor, using waterproof cloth, flexible sealing sleeves, and other technical measures to achieve dry and wet separation. This type of device is relatively large and requires supporting civil engineering structures, as exemplified by Chinese patent applications CN201711147021.6 and CN201910349899.0. The vibration simulation table, actuator shaft, and other components of this device are transferred through a sealing layer composed of waterproof cloth and flexible sealing sleeves, creating a sealed, waterproof chamber at the bottom. However, this approach poses significant safety risks. The medium (water) in the deep-sea environmental simulation tank can exert long-term stress on the sealing layer. Furthermore, the reciprocating motion of the actuator, the fluctuating water pressure of the excited water, and the air pressure within the sealed chamber can affect the reliability and lifespan of the sealing layer, potentially jeopardizing the authenticity of the test data.

[0004] Another type of deep-sea earthquake simulator is based on hypergravity simulation, which offers the advantages of portability and integration. By generating an n-fold hypergravity field, a gravity field equivalent to that of the prototype is produced on a 1 / n-scale physical model, while also shortening the prototype time by a factor of n, thereby achieving "space-time compression." This device can realistically simulate the transmission patterns of earthquake motion within large-scale spaces and the catastrophic effects of rock and soil masses, making it particularly suitable for seismic research on large-scale civil engineering projects such as offshore structures. For example, Chinese patent application number CN201310165160.7 only mentions its applicability to deep-sea earthquake simulation and does not provide a specific principle solution. Furthermore, the hypergravity effect of the vertical water medium can further affect the reliability of the sealing layer.

[0005] Therefore, it is necessary to develop an interpenetrating phase composite structure based on a shape memory programming skeleton and a manufacturing method thereof to solve the above problems. Summary of the Invention

[0006] The purpose of the present invention is to design an interpenetrating phase composite structure based on a shape memory programming skeleton and a manufacturing method thereof in order to solve the above problems.

[0007] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0008] An interpenetrating phase composite structure based on a shape memory programming skeleton, comprising:

[0009] Skeleton; the skeleton is a structure that pre-deforms the porous structure through the shape memory behavior of the matrix material;

[0010] Filling phase; the filling phase is filled in the skeleton; the filling phase is initially a fluid liquid, and after filling, it is solidified through conditional stimulation and cooperates with the skeleton to form an interpenetrating phase composite material in which both phases are solid.

[0011] The pre-deformation of the skeleton structure is programmed to be any one of tensile deformation, compression deformation, bending deformation and torsional deformation.

[0012] The skeleton is any one of a negative Poisson's ratio structure, a zero Poisson's ratio structure, and a positive Poisson's ratio structure.

[0013] The shape memory of the skeleton is stimulated by any one of thermal, magnetic, optical, and electrical stimulation.

[0014] The skeleton is made of shape memory polymer or shape memory alloy.

[0015] The filling phase material is a two-component post-curing solution.

[0016] Post-curing is any one of heat curing, light curing, magnetic curing, and long-term slow reaction curing.

[0017] The material of the filling phase is any one of epoxy resin and polydimethylsiloxane.

[0018] A method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton comprises the following steps:

[0019] S1, 3D printing of a matrix material with shape memory to form a porous structure;

[0020] S2, pre-deformation programming of the porous structure through the shape memory behavior of the matrix material to obtain a pre-programmed porous structure;

[0021] S3, using the pre-programmed porous structure as a skeleton, the skeleton is filled with a filling phase, and the filling phase reacts and solidifies to form an interpenetrating phase composite structure with a shape memory programmed skeleton;

[0022] S4, by designing the reaction and solidification conditions of the filling phase in the interpenetrating phase composite structure and the excitation conditions during the shape memory process of the porous structure skeleton, the deformation behavior of the interpenetrating phase composite structure during the shape memory process is regulated.

[0023] The beneficial effects of the present invention are:

[0024] The present application can realize the controllable design of thermal expansion of composite materials through shape memory programming skeleton; the programming characteristics, volume fraction, recovery driving force and other characteristics of the skeleton can regulate the interaction and competition relationship between the skeleton phase and the filling phase in the composite material, and thus regulate the thermal expansion characteristics of the composite material; the production method can fully realize the controllability of the thermal expansion of the composite material, improve the range of the thermal expansion of the material, realize the adaptability of the composite material to the thermal environment, and solve the adverse effects caused by temperature in major equipment serving in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the fabrication method of an interpenetrating phase composite structure based on a shape memory programming skeleton;

[0026] Figure 2 Schematic diagram of a three-dimensional orthotropic negative Poisson's ratio structure cell;

[0027] Figure 3 Schematic diagram of thermal deformation of conventional continuum materials; A is the initial shape; B is the shape after shape memory pre-stretching deformation programming; C is the deformation diagram after heating;

[0028] Figure 4 Schematic diagram of thermal deformation of the shape memory pre-stretch deformation programming skeleton; A is the initial shape; B is the deformation diagram after heating;

[0029] Figure 5 Schematic diagram of the preparation process of an interpenetrating phase composite structure based on a shape memory programming framework; A is the initial form of the framework; B is the form of the framework after shape memory pre-stretching deformation programming; C is the form of the composite material formed after the framework shape is solidified and filled with the second box;

[0030] Figure 6 Schematic diagram of thermal deformation of the interpenetrating phase composite structure based on the shape memory pre-stretching deformation programming skeleton; A is the initial shape; B is the deformation diagram after heating.

[0031] In the figure: 1. Skeleton; 2. Filling phase; 3. Interpenetrating phase composite structure. DETAILED DESCRIPTION

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are intended to fall within the scope of protection of the present invention.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0035] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0038] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, implementation case 1:

[0040] In this case study, the design and preparation of composite materials with low / negative thermal expansion coefficients were conducted to address the problem that conventional polymer materials have large thermal expansion, which can easily cause large thermal deformation and thus affect the stability and safety of equipment. For this composite material, a 4D-printed shape memory polymer negative Poisson's ratio structural skeleton was used, filled with polydimethylsiloxane (PDMS) as the filling phase to form an interpenetrating composite structure3. Shape memory programming was used to achieve the thermal contraction and expansion behavior of the skeleton phase. This was combined with the thermal expansion and contraction of PDMS, and by regulating the interaction and competition between the two phases, the low / negative thermal expansion of the composite material was ultimately achieved. The specific implementation of the case study is as follows:

[0041] Step 1: 3D printing the porous structure of thermosensitive shape memory material

[0042] According to the requirements of the case, a three-dimensional orthotropic negative Poisson's ratio structure is designed, such as Figure 2 The cellular structure is arranged in an orderly manner to form a multicellular negative Poisson's ratio structural material, and then a practical model of the negative Poisson's ratio structure is prepared by light-curing 3D printing technology. The printing material is a light-curing two-way shape memory resin material.

[0043] Step 2: Pre-deformation programming of porous structures based on shape memory behavior

[0044] Since the crystallization / melting temperature of the shape memory material is higher than room temperature, bidirectional shape memory programming can be achieved above room temperature. The negative Poisson structure material prepared by the bidirectional shape memory polymer is subjected to shape memory programming, such as Figure 3 Above the melting temperature θ 1. Carry out stretching pre-deformation programming, fix the deformation and keep it below the crystallization temperature. θ 3 to fix the shape and obtain temporary shape S1; then, the temperature is raised to a temperature higher than the crystallization temperature and lower than the melting temperature. θ 2. At this time, the shape is partially restored and a temporary shape S2 is obtained; at temperature θ 3 and θ By increasing and decreasing the temperature between 2, the shapes S1 and S2 can be transformed into each other, which is a two-way shape memory. Figure 4 The thermal contraction and thermal expansion characteristics of the continuum material shown are exactly opposite.

[0045] Step 3: Fill the programmed skeleton with a two-component solution to prepare an interpenetrating composite material

[0046] In this embodiment, a two-component PDMS solution is filled into the negative Poisson's ratio skeleton structure of the shape memory programming in step 2, and is kept in a vacuum environment for 48 hours to form an interpenetrating phase composite material after curing. The preparation process is shown in the schematic diagram. Figure 5 shown.

[0047] Step 4: Thermal deformation test of shape memory programming skeleton-based interpenetrating phase composite materials

[0048] In this embodiment, the shape memory programmed negative Poisson's ratio structure skeleton-based interpenetrating phase composite material prepared in step 3 is subjected to a thermal deformation test, and a thermal cycle test of heating and cooling cycles is performed. The thermal deformation diagram is shown in FIG. Figure 6 As shown in the figure, during the heating process, the filling phase undergoes thermal expansion, and the skeleton phase undergoes thermal contraction due to shape memory programming. Under the interaction and competition between the two phases, the composite material exhibits low or even negative thermal expansion.

[0049] Step 5: Controllable design of thermal expansion of interpenetrating composite materials

[0050] In this embodiment, for the shape memory programmed skeleton-based interpenetrating phase composite material prepared in step three, the main factors affecting its thermal deformation are discussed, including programmed pre-deformation, programming temperature, filling phase structure form and volume fraction, skeleton structure parameters, etc. By adjusting these influencing factors, the recovery driving force of the skeleton structure's two-way shape memory can be regulated, thereby achieving the adjustment of the interaction force between the skeleton phase and the filling phase, and finally realizing the thermal expansion control design of the composite material.

[0051] The intelligent assembly in this application relies on a skeleton programmed with a shape memory effect to achieve thermal expansion control of the composite material. Since the shape memory material has programmable properties, its programmed skeleton structure can achieve unusual thermal contraction and cold expansion properties, which are then combined with the thermal expansion and cold contraction of the composite material filling phase. By adjusting the interaction between the skeleton phase and the filling phase, the controllable design of the thermal expansion of the composite material can be achieved.

[0052] In the present application, the skeleton 1 can be a negative Poisson's ratio structure to achieve three-dimensional isotropic thermal expansion; the structure can also be a zero Poisson's ratio structure to achieve anisotropic thermal expansion characteristics; the structure can also be a positive Poisson's ratio structure to achieve isotropically enhanced thermal expansion characteristics.

[0053] In the present application, the pre-deformation programming of the skeleton structure can be deformation such as stretching, compression, bending, torsion, etc. Different pre-deformation programming can achieve different thermal response characteristics.

[0054] In the present application, the filling phase 2 that fills the programming skeleton is initially a liquid with good fluidity. After filling, it is cured to achieve an interpenetrating composite material in which both phases are solid. The material is not limited to a two-component post-curing solution, such as epoxy resin, polydimethylsiloxane and other two-component materials, but can also be a solution that is cured under different conditions. The post-curing of the material is not limited to thermal curing, but can also be light curing, magnetic curing, long-term slow reaction curing and other curing methods.

[0055] In the present application, the skeleton material is a programmable smart material, which has programmable properties and can realize the transformation of structural configuration, such as shape memory polymers, shape memory alloys and other smart materials.

[0056] In the present application, the thermal expansion characteristics of the composite material can be achieved by regulating the interaction and competition relationship between the two phases. The relationship between the two phases is determined by the volume fractions of the skeleton phase and the filling phase, the structural form, the material properties, etc. The controllability of the thermal expansion of the composite material can also be achieved by regulating these factors.

[0057] In the present application, the excitation of the shape memory effect of the skeleton matrix material is not limited to thermal excitation, magnetic excitation, optical excitation, and electrical excitation.

[0058] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton, characterized in that: The following steps are involved: S1, 3D printing of a matrix material with shape memory to form a porous structure; S2, pre-deformation programming of the porous structure through the shape memory behavior of the matrix material to obtain a pre-programmed porous structure; S3, using the pre-programmed porous structure as a skeleton, the skeleton is filled with a filling phase, the filling phase material is a two-component post-curing solution, and a fluid liquid, and the filling phase reacts and solidifies to form an interpenetrating phase composite structure with a shape memory programming skeleton; S4, by designing the reaction and solidification conditions of the filling phase in the interpenetrating phase composite structure and the excitation conditions during the shape memory process of the porous structure skeleton, the deformation behavior of the interpenetrating phase composite structure during the shape memory process is regulated.

2. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 1, characterized in that: Interpenetrating composite structures include: Skeleton; the skeleton is a structure that pre-deforms the porous structure through the shape memory behavior of the matrix material; Filling phase; the filling phase is filled in the skeleton; the filling phase is initially a fluid liquid, and after filling, it is solidified through conditional stimulation and cooperates with the skeleton to form an interpenetrating phase composite material in which both phases are solid.

3. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 2, characterized in that: The pre-deformation of the skeleton structure is programmed to be any one of tensile deformation, compression deformation, bending deformation and torsional deformation.

4. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 2, characterized in that: The skeleton is any one of a negative Poisson's ratio structure, a zero Poisson's ratio structure, and a positive Poisson's ratio structure.

5. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 2, characterized in that: The shape memory of the skeleton is stimulated by any one of thermal, magnetic, optical, and electrical stimulation.

6. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 2, characterized in that: The skeleton is made of shape memory polymer or shape memory alloy.

7. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 1, characterized in that: Post-curing is any one of heat curing, light curing, magnetic curing, and long-term slow reaction curing.

8. The method for manufacturing an interpenetrating phase composite structure based on a shape memory programming skeleton according to claim 1, characterized in that: The material of the filling phase is any one of epoxy resin and polydimethylsiloxane.

Images