Method for predicting full stress-strain curve of microcapsule self-repairing material

Abstract

The application provides a microcapsule self-repairing material full stress-strain curve prediction method and device, and solves the problem that the mesoscopic mechanics model cannot reflect and predict the softening stage after the peak value of a cement-based material under three-dimensional conditions in the prior art. The method comprises the following steps: if the self-repairing concrete material is a conventional concrete material, calculating the full stress-strain curve of the conventional concrete material under three-dimensional conditions and under tensile load; if the self-repairing concrete material is a microcapsule self-repairing concrete material containing a strong healing agent, calculating the full stress-strain curve of the microcapsule self-repairing concrete material containing the strong healing agent under three-dimensional conditions and under tensile load; and if the self-repairing concrete material is a microcapsule self-repairing concrete material containing a weak healing agent, calculating the full stress-strain curve of the microcapsule self-repairing concrete material containing the weak healing agent under three-dimensional conditions and under tensile load. The microcapsule self-repairing material full stress-strain curve prediction device is applied to the microcapsule self-repairing material full stress-strain curve prediction method.

Description

Technical Field

[0001] This invention relates to the field of tunnel and underground engineering materials technology, and in particular to a method and apparatus for predicting the full stress-strain curve of a microcapsule self-healing material. Background Technology

[0002] With the development of modern society towards intelligence, passive post-construction and periodic maintenance can no longer meet the requirements of modern multifunctional intelligent buildings for concrete materials. Inspired by the self-healing phenomenon in the biological field, materials scientists are attempting to produce artificial self-healing materials that can automatically repair damage. Among these artificial self-healing materials, cemented composite materials with self-healing functions have become one of the hot topics in the field of building materials, with broad application prospects and research value.

[0003] Biomimetic self-healing concrete is based on the concept of the self-healing mechanism of biological tissues, which refers to the ability of a wound to repair itself after the automatic secretion of certain substances at the site of injury. Based on this concept, capsules or glass tubes containing a repair agent are incorporated into the conventional components of concrete, forming an intelligent self-healing network system within the concrete. When the concrete material cracks, the expanding microcracks force the glass tube or capsule carrier to rupture, causing the repair agent to flow out of the carrier and penetrate into the cracks under capillary action or gravity. Then, under the action of a curing agent and catalyst, the expanding microcracks undergo a chemical reaction to adhere to the surface of the microcracks, preventing microcrack growth while restoring or even improving the material's stiffness, fracture toughness, and strength. There are two main packaging technologies for encapsulating the repair agent: microencapsulation and glass fiber tubes. Compared to self-healing concrete containing fiberglass tubes, self-healing concrete containing microcapsules has several advantages: material processing is relatively easy, and in many cases, microcapsules can be directly mixed with the concrete mixture, resulting in a more uniform distribution of microcapsules within the concrete, making them more likely to repair more microcracks; simultaneously, when the capsules rupture, the spherical microcapsules allow for better release of the repair agent and reduce stress concentration caused by the empty shells left after capsule rupture; furthermore, the residual stress on the pore walls is relatively low after the release of the repair agent; and the shell material of the microcapsules is mostly soft, making it easier to absorb cracks, thus exhibiting better self-healing effects. The self-healing ability of self-healing concrete containing microcapsules can be verified and quantified through experimental methods. However, these experiments can only qualitatively demonstrate the self-healing ability of microcapsule-containing self-healing concrete and cannot reveal the multi-scale damage-repair mechanics mechanism of microcapsule-containing self-healing concrete under load.

[0004] Currently, there are relatively few micromechanical models that can describe the multi-scale damage-repair mechanics mechanism of microcapsule self-healing concrete under load. Han Kaihang proposed two three-dimensional micromechanical models for microcapsule self-healing concrete under tensile and compressive loads. The stress-strain relationship of some brittle materials such as rock and concrete often includes stages such as linear elasticity, nonlinear strengthening, and strain softening. Regarding the research on constitutive curve prediction methods for microcapsule self-healing concrete, existing three-dimensional micromechanical models mainly focus on the nonlinear elastic stage before the external load reaches the bearing limit, failing to reflect and predict the softening stage after the peak load of the self-healing concrete material. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a method and apparatus for predicting the full stress-strain curve of microcapsule self-healing materials. This solves the problem that existing micro-damage-repair mechanics models under three-dimensional conditions, which mainly focus on the nonlinear elastic stage before the external load reaches the bearing limit, fail to reflect and predict the softening stage of cement-based materials after the peak value.

[0006] This invention provides a method for predicting the full stress-strain curve of a microcapsule self-healing material, the method comprising:

[0007] Determine whether self-healing concrete materials contain microcapsules;

[0008] If not, then the self-healing concrete material is a conventional concrete material, and the full stress-strain curve of the conventional concrete material under tensile load under three-dimensional conditions is calculated.

[0009] If so, determine the fracture toughness load of the repaired microcrack surface after the curing agent contained in the microcapsules in the self-healing concrete material has been cured. If the fracture toughness load of the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with strong healing agent. Calculate the full stress-strain curve of the self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions. If the fracture toughness load of the repaired microcrack surface is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with weak healing agent. Calculate the full stress-strain curve of the self-healing concrete material containing microcapsules with weak healing agent under tensile load in three dimensions.

[0010] Preferably, the formula for calculating the full stress-strain curve of conventional concrete under tensile load in three dimensions is as follows:

[0011] Linear elastic stage:

[0012] Nonlinear strengthening stage:

[0013]

[0014] Stress drop stage:

[0015] Strain softening stage:

[0016]

[0017] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0018] Preferably, if the fracture toughness load of the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with a strong healing agent; if the fracture toughness load of the repaired microcrack surface is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with a weak healing agent, including:

[0019] like The repaired microcrack surface fracture toughness load is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, wherein the self-healing concrete material is a self-healing concrete material containing microcapsules with a strong healing agent.

[0020] in,

[0021] σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. hThis indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing.

[0022] like The repaired microcrack fracture load is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules, wherein the self-healing concrete material is a self-healing concrete material containing microcapsules with a weak healing agent.

[0023] in,

[0024] σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing.

[0025] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions is as follows:

[0026] Linear elastic stage:

[0027] Nonlinear stage:

[0028] Stress drop stage:

[0029] Strain softening stage:

[0030]

[0031] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0032] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules of weak healing agent under tensile load in three dimensions is as follows:

[0033] Linear elastic stage:

[0034] Nonlinear stage:

[0035] Stress drop stage:

[0036] Strain softening stage:

[0037]

[0038] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0039] Compared with the prior art, the method for predicting the full stress-strain curve of a microcapsule self-healing material provided by the embodiments of the present invention has the following beneficial effects: The present invention first determines whether the self-healing concrete material contains microcapsules; if not, the self-healing concrete material is a conventional concrete material, and the full stress-strain curve of the conventional concrete material under tensile load is calculated; if yes, the fracture toughness load of the repaired microcrack surface after the curing agent contained in the microcapsules in the self-healing concrete material is determined; if the fracture toughness load of the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the concrete without microcapsules, the self-healing concrete material is a self-healing concrete material containing microcapsules with strong healing agent, and the full stress-strain curve of the self-healing concrete material containing microcapsules with strong healing agent under tensile load under three-dimensional conditions is calculated; if the fracture toughness load of the repaired microcrack surface is less than the original fracture load of the microcrack in the concrete without microcapsules, the self-healing concrete material is a self-healing concrete material containing microcapsules with weak healing agent, and the full stress-strain curve of the self-healing concrete material containing microcapsules with weak healing agent under tensile load under three-dimensional conditions is calculated. This invention can calculate the full stress-strain curves of conventional concrete materials without microcapsules, self-healing concrete materials with microcapsules containing strong healing agents, and self-healing concrete materials with microcapsules containing weak healing agents under three-dimensional strain conditions under tensile load. In other words, it can establish stress-strain curves of concrete materials with or without microcapsules under tensile load. Under three-dimensional conditions, it can directly reflect and predict the micromechanical model of the softening stage after the peak value of concrete materials.

[0040] The present invention also provides a device for predicting the full stress-strain curve of microcapsule self-healing materials, the device comprising:

[0041] The judgment module is used to determine whether the self-healing concrete material contains microcapsules;

[0042] The module for full stress-strain curves of conventional materials is used to calculate the full stress-strain curves of conventional concrete materials under tensile loads in three dimensions when the self-healing concrete material is a conventional concrete material.

[0043] The full stress-strain curve module for self-healing materials containing microcapsules with strong healing agents is used to determine the fracture toughness load of the repaired microcrack surface after the healing agent contained in the microcapsules in the self-healing concrete material has cured. If the fracture toughness load of the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with strong healing agents. The full stress-strain curve of the self-healing concrete material containing microcapsules with strong healing agents under tensile load under three-dimensional conditions is calculated.

[0044] The full stress-strain curve module for self-healing materials containing microcapsules with weak healing agents is used to determine the fracture toughness load of the repaired microcrack surface after the healing agent contained in the microcapsules in the self-healing concrete material has cured. If the fracture toughness load of the repaired microcrack surface is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with weak healing agents. The full stress-strain curve of the self-healing concrete material containing microcapsules with weak healing agents under tensile load under three-dimensional conditions is calculated.

[0045] Preferably, the formula for calculating the full stress-strain curve of conventional concrete under tensile load in three dimensions is as follows:

[0046] Linear elastic stage:

[0047] Nonlinear strengthening stage:

[0048]

[0049] Stress drop stage:

[0050] Strain softening stage:

[0051]

[0052] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n cThe value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0053] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions is as follows:

[0054] Linear elastic stage:

[0055] Nonlinear stage:

[0056] Stress drop stage:

[0057] Strain softening stage:

[0058]

[0059] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0060] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules of weak healing agent under tensile load in three dimensions is as follows:

[0061] Linear elastic stage:

[0062] Nonlinear stage:

[0063] Stress drop stage:

[0064] Strain softening stage:

[0065]

[0066] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0067] Compared with the prior art, the beneficial effects of the device for predicting the full stress-strain curve of microcapsule self-healing material provided by the present invention are the same as the beneficial effects of the method for predicting the full stress-strain curve of microcapsule self-healing material described in the above technical solution, and will not be repeated here.

[0068] The present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor. The transceiver, the memory, and the processor are connected via the bus. When the computer program is executed by the processor, it implements the steps in the method for predicting the full stress-strain curve of a microcapsule self-healing material as described in any of the preceding claims.

[0069] Compared with the prior art, the beneficial effects of the electronic device provided by the present invention are the same as those of the method for predicting the full stress-strain curve of a microcapsule self-healing material described in the above technical solution, and will not be repeated here.

[0070] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0071] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0072] Figure 1 A flowchart of a method for predicting the full stress-strain curve of a microcapsule self-healing material provided in an embodiment of the present invention is shown;

[0073] Figure 2 A schematic diagram illustrating the classification of cement-based composite materials provided in embodiments of the present invention is shown;

[0074] Figure 3 The following is a diagram showing the full stress-strain curves of concrete with or without microcapsules under tensile load in three dimensions, as provided in the embodiments of the present invention.

[0075] Figure 4 A schematic diagram of the structure of a device for predicting the full stress-strain curve of a microcapsule self-healing material provided in an embodiment of the present invention is shown. Detailed Implementation

[0076] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0077] In this embodiment, "multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Words such as "exemplary" or "for example" are used to indicate examples, illustrations, or explanations, intended to present related concepts in a specific manner, and should not be construed as superior or more advantageous than other embodiments or designs.

[0078] This invention provides a method for predicting the full stress-strain curve of a microcapsule self-healing material. Figure 1 A flowchart illustrating a method for predicting the full stress-strain curve of a microcapsule self-healing material according to an embodiment of the present invention is shown. Figure 1 As shown, the method includes:

[0079] Step S1: Determine whether the self-healing concrete material contains microcapsules.

[0080] It should be understood that self-healing concrete materials can be cement-based composite materials. The first step is to determine whether the self-healing concrete material contains microcapsules. Figure 2 A schematic diagram illustrating the classification of cement-based composite materials provided in an embodiment of the present invention is shown.

[0081] Step S2: As Figure 2 As shown, if the self-healing concrete material does not contain microcapsules, then the self-healing concrete material is a conventional concrete material. The full stress-strain curve of conventional concrete material under tensile load under three-dimensional strain conditions is calculated according to the following formula:

[0082] Linear elastic stage:

[0083] Nonlinear strengthening stage:

[0084]

[0085] Stress drop stage:

[0086] Strain softening stage:

[0087]

[0088] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0089] Step 3: If the self-healing concrete material contains microcapsules, determine the fracture toughness load of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured.

[0090] Step 4: If in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing.

[0091] If the fracture toughness load on the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with a strong healing agent. The full stress-strain curve of the self-healing concrete material containing microcapsules with a strong healing agent under tensile load under three-dimensional strain conditions is calculated according to the following formula:

[0092] Linear elastic stage:

[0093] Nonlinear stage:

[0094] Stress drop stage:

[0095] Strain softening stage:

[0096]

[0097] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0098] Step 5: If in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing.

[0099] The fracture toughness load on the repaired microcrack surface is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules. The self-healing concrete material is a self-healing concrete material containing microcapsules with a weak healing agent. The full stress-strain curve of the self-healing concrete material with microcapsules containing a weak healing agent under tensile load under three-dimensional strain conditions is calculated according to the following formula:

[0100] Linear elastic stage:

[0101] Nonlinear stage:

[0102] Stress drop stage:

[0103] Strain softening stage:

[0104]

[0105] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a uK represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0106] The method for predicting the full stress-strain curve of microcapsule self-healing materials provided in this invention can be used to study the three-dimensional microscopic damage-repair mechanical evolution behavior of microcapsule self-healing concrete under tensile load in three-dimensional conditions.

[0107] In the specific implementation case, the Young's modulus E and Poisson's ratio ν of the original material are 34450 MPa and 0.2, respectively. The fracture toughness characteristics of the weak plane and the matrix are assumed to be K. IC = 0.165 MPa × m1 / 2, K IIC =0.33MPa×m1 / 2 and K IIC =0.577MPa×m1 / 2. The initial and activated self-similar microcrack radii on the weak plane are a0 = 0.34 cm, a u = 0.49 cm. Other parameters are also assumed as follows. The fracture toughness of the interface between the polymeric repair agent and the matrix is... The initial number density of microcracks should be n c =N / V = 1.8 × 10⁶ m -3 The control sample was subjected to a tensile load of 4 MPa to induce initial damage. The healing efficiency h was equal to 0.5.

[0108] Based on the above parameters, and using the prediction method for the full stress-strain curve of the microcapsule self-healing material provided in this embodiment of the invention, the following can be obtained: Figure 3 The diagram shows the full stress-strain curves of concrete with and without microcapsules under tensile load.

[0109] This invention can calculate the constitutive curves of conventional concrete without microcapsules, self-healing concrete with microcapsules containing strong healing agents, and self-healing concrete with microcapsules containing weak healing agents under three-dimensional strain conditions under tensile loads. In other words, it can establish the stress-strain curves of concrete materials with and without microcapsules under tensile loads, and analyze the three-dimensional strain microscopic damage-repair mechanical evolution behavior of microcapsule self-healing concrete under tensile loads. Figure 3 The full stress-strain curve shown can directly reflect and predict the micromechanical model of the post-peak softening stage of concrete materials.

[0110] Figure 4 A schematic diagram of the structure of the device for predicting the full stress-strain curve of microcapsule self-healing materials provided in an embodiment of the present invention is shown, as follows. Figure 4 As shown, the device includes:

[0111] Module 1 is used to determine whether the self-healing concrete material contains microcapsules;

[0112] The conventional material full stress-strain curve module 2 is used to calculate the full stress-strain curve of conventional concrete material under tensile load in three dimensions when the self-healing concrete material is conventional concrete material.

[0113] The full stress-strain curve module 3 for self-healing materials containing microcapsules with strong healing agents is used to determine the fracture toughness load of the repaired microcrack surface after the healing agent contained in the microcapsules in the self-healing concrete material has been cured. If the fracture toughness load of the repaired microcrack surface is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with strong healing agents. The full stress-strain curve of the self-healing concrete material containing microcapsules with strong healing agents under tensile load under three-dimensional conditions is calculated.

[0114] The full stress-strain curve module 4 for self-healing materials containing microcapsules with weak healing agents is used to determine the fracture toughness load of the repaired microcrack surface after the healing agent contained in the microcapsules in the self-healing concrete material has cured. If the fracture toughness load of the repaired microcrack surface is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules, then the self-healing concrete material is a self-healing concrete material containing microcapsules with weak healing agents. The full stress-strain curve of the self-healing concrete material containing microcapsules with weak healing agents under tensile load under three-dimensional conditions is calculated.

[0115] Preferably, the formula for calculating the full stress-strain curve of conventional concrete under tensile load in three dimensions is as follows:

[0116] Linear elastic stage:

[0117] Nonlinear strengthening stage:

[0118]

[0119] Stress drop stage:

[0120] Strain softening stage:

[0121]

[0122] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0123] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions is as follows:

[0124] Linear elastic stage: Nonlinear stage: Stress drop stage: Strain softening stage:

[0125]

[0126] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0127] Preferably, the formula for calculating the full stress-strain curve of self-healing concrete material containing microcapsules of weak healing agent under tensile load in three dimensions is as follows:

[0128] Linear elastic stage:

[0129] Nonlinear stage:

[0130] Stress drop stage:

[0131] Strain softening stage:

[0132]

[0133] Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

[0134] Compared with the prior art, the beneficial effects of the device for predicting the full stress-strain curve of a microcapsule self-healing material provided in this embodiment of the invention are the same as the beneficial effects of the method for predicting the full stress-strain curve of a microcapsule self-healing material described in the above technical solution, and will not be repeated here.

[0135] The present invention also provides an electronic device, including a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor. The transceiver, the memory, and the processor are connected via the bus. When the computer program is executed by the processor, it implements the steps in the method for predicting the full stress-strain curve of a microcapsule self-healing material as described above.

[0136] Compared with the prior art, the beneficial effects of the electronic device provided in the embodiments of the present invention are the same as the beneficial effects of the method for predicting the full stress-strain curve of a microcapsule self-healing material described in the above technical solution, and will not be repeated here.

[0137] The present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps in the method for predicting the full stress-strain curve of a microcapsule self-healing material as described above.

[0138] Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the embodiments of the present invention are the same as the beneficial effects of the method for predicting the full stress-strain curve of a microcapsule self-healing material described in the above technical solution, and will not be repeated here.

[0139] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method for predicting the full stress-strain curve of a microcapsule self-healing material, characterized in that, include: Determine whether self-healing concrete materials contain microcapsules; If not, then the self-healing concrete material is a conventional concrete material, and the full stress-strain curve of the conventional concrete material under tensile load under three-dimensional conditions is calculated. If so, then determine the fracture toughness load of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. The repaired microcrack surface fracture toughness load is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, wherein the self-healing concrete material is a self-healing concrete material containing microcapsules with a strong healing agent. in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing. Calculate the full stress-strain curve of self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions; like The repaired microcrack surface fracture toughness load is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules. The self-healing concrete material is a self-healing concrete material containing microcapsules with a weak healing agent. in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing. Calculate the full stress-strain curve of self-healing concrete material containing microcapsules with weak healing agent under tensile load in three dimensions.

2. The method for predicting the full stress-strain curve of the microcapsule self-healing material according to claim 1, characterized in that, The formula for calculating the full stress-strain curve of conventional concrete under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear strengthening stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

3. The method for predicting the full stress-strain curve of the microcapsule self-healing material according to claim 1, characterized in that, The formula for calculating the full stress-strain curve of self-healing concrete containing microcapsules with a strong healing agent under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

4. The method for predicting the full stress-strain curve of the microcapsule self-healing material according to claim 1, characterized in that, The formula for calculating the full stress-strain curve of self-healing concrete containing microcapsules with a weak healing agent under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

5. A device for predicting the full stress-strain curve of a microcapsule self-healing material, characterized in that, include: The judgment module is used to determine whether the self-healing concrete material contains microcapsules; The module for full stress-strain curves of conventional materials is used to calculate the full stress-strain curves of conventional concrete materials under tensile loads in three dimensions when the self-healing concrete material is a conventional concrete material. The full stress-strain curve module for self-healing materials containing microcapsules with strong healing agents is used to determine the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. The repaired microcrack surface fracture toughness load is greater than or equal to the original fracture load of the microcrack in the self-healing concrete material without microcapsules, wherein the self-healing concrete material is a self-healing concrete material containing microcapsules with a strong healing agent. in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing. Calculate the full stress-strain curve of self-healing concrete material containing microcapsules with strong healing agent under tensile load in three dimensions; The full stress-strain curve module for self-healing materials containing microcapsules with weak healing agents is used to determine the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. The repaired microcrack surface fracture toughness load is less than the original fracture load of the microcrack in the self-healing concrete material without microcapsules. The self-healing concrete material is a self-healing concrete material containing microcapsules with a weak healing agent. in, σ cc K represents the original fracture load of microcracks in self-healing concrete materials without microcapsules. ICC θ represents the fracture toughness of unrepaired microcracks. h1 α represents the spatial dip angle at the boundary between unrepaired and repaired microcracks. u σ represents the radius of the microcrack after its first propagation. h c K represents the fracture toughness load on the surface of microcracks repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h IC α represents the fracture toughness of the microcrack surface repaired after the healing agent contained in the microcapsules in the self-healing concrete material has cured. h This indicates the radius of the microcracks repaired by the healing agent contained in the microcapsules of the self-healing concrete material after curing. Calculate the full stress-strain curve of self-healing concrete material containing microcapsules with weak healing agent under tensile load in three dimensions.

6. The device for predicting the full stress-strain curve of microcapsule self-healing materials according to claim 5, characterized in that, The formula for calculating the full stress-strain curve of conventional concrete under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear strengthening stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

7. The device for predicting the full stress-strain curve of microcapsule self-healing materials according to claim 5, characterized in that, The formula for calculating the full stress-strain curve of self-healing concrete containing microcapsules with a strong healing agent under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

8. The device for predicting the full stress-strain curve of microcapsule self-healing materials according to claim 5, characterized in that, The formula for calculating the full stress-strain curve of self-healing concrete containing microcapsules with a weak healing agent under tensile load in three dimensions is as follows: Linear elastic stage: Nonlinear stage: Stress drop stage: Strain softening stage: Where ε represents the strain of the concrete specimen, σ represents the stress of the concrete specimen, ν represents the Poisson's ratio of the concrete specimen, and n c The value represents the spatial distribution density of microcracks, E represents the initial elastic modulus of concrete, a0 represents the initial radius of the microcracks, and a u K represents the radius after the microcrack propagates. ICC It indicates the fracture toughness of the concrete substrate.

9. An electronic device comprising a bus, a transceiver, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the transceiver, the memory, and the processor are connected via the bus, characterized in that, When the computer program is executed by the processor, it implements the steps in the method for predicting the full stress-strain curve of a microcapsule self-healing material as described in any one of claims 1-4.

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