18 results about "Inhomogeneous material" patented technology

The embodiment of the invention provides a dicing saw cutting pressure control method and device based on dynamic pressure prediction and a dicing saw. The method comprises the steps that S1, real-time material characteristic parameters on a cutting path are obtained through a multi-source sensor; s2, based on the material characteristic parameters, a dynamic mapping model of material characteristics and cutting pressure is established, and output parameters are predicted pressure compensation values; s3, before a cutting tool reaches a pressure sudden change area, cutting pressure is adjusted in advance according to a predicted pressure compensation value output by the dynamic mapping model, meanwhile, an actual pressure value is detected in real time through a force sensor, and pressure deviation is corrected in combination with a control algorithm; and S4, carrying out staged pressure loading on the non-uniform doping region in the heterogeneous material. According to the method, the pressure sudden change point is predicted through the dynamic mapping model, the pressure is adjusted in advance in combination with a control algorithm, and the characteristics of the adaptive heterogeneous material are loaded in stages, so that the shear mark uniformity is remarkably improved, and the material damage risk is reduced.

The invention relates to a material sound velocity measurement method based on an envelope cross-correlation algorithm, relates to the technical field of automatic detection, and solves the technical problem of serious waveform distortion interference in sound velocity measurement of an internal non-uniform material in the prior art. The method comprises the following steps: initialization setting and reference acquisition; performing point-by-point scanning on the current scanning surface of the tested sample to obtain sample echoes; drawing a sound velocity distribution diagram of the current scanning surface of the tested sample; rotating the sample to be measured and continuously measuring until the detection of the three orthogonal surfaces is completed; the average sound velocity of the tested sample is obtained. By applying the material sound velocity measurement method, scattering attenuation and frequency dispersion effect interference caused by material anisotropy can be eliminated, a period jump error caused by carrier phase ambiguity is reduced, the signal-to-noise ratio of a detection signal is effectively improved, automation and high repeatability of sound velocity measurement are achieved, and the measurement accuracy is improved. And the recognition accuracy of the small sound velocity difference is improved.

This invention involves a device for on-site evaluation of tensile strength and fracture properties of homogeneous and non-homogeneous materials. The lack of a device that can be used for field evaluation of fracture properties is one of the problems of the industry in the production of asphalt, concrete, stone, etc. The proposed design is a small, simple and portable device to overcome this deficiency by inducing ruptures in the sample. With the help of this device, it is possible to test the ring-shaped and cored parts quickly, uniaxially and biaxially. The device can create different mounting fixtures to activate traction, shear and combined modes. The invention performs the tests only with the help of a pneumatic pump, thus eliminating the need to transport the part to the laboratory. The device can also be used to determine the weakest point to ensure the accuracy of the estimates.

The present invention provides a method for shear instability criterion of heterogeneous materials, which specifically includes the following steps: (1) Conduct mechanical property tests on jet materials under various dynamic conditions to obtain the JC dynamic constitutive relationship of heterogeneous materials; (2) Conduct perturbation analysis on the materials based on the JC dynamic constitutive relationship to obtain the shear instability criterion of the materials; (3) Substitute the JC dynamic constitutive parameters into the shear instability criterion to obtain the critical strain of material shear instability. The present invention has a reasonable concept, fully considers the influence of multi-phase inclusions and strain gradient effects of materials on shear instability, can be widely applied to various new heterogeneous materials, and can obtain the shear instability criterion at low cost, efficiently and accurately.

The invention discloses a partition temperature control and surface variable radiance integral structure, and relates to the field of integral structure stability treatment. Comprising an integral structure, partition heat insulation plates, a partition radiation heat source and a surface coating, the partition heat insulation plates are arranged outside the integral structure and arranged at corresponding positions according to the temperature partition requirements of the integral structure to form a plurality of temperature control areas, and the temperature control areas at least comprise a high heat treatment temperature control area and a low heat treatment temperature control area; the partitioned radiation heat sources are arranged in different temperature control regions; the outer surface of the integral structure is coated with surface coatings with different radiance; the overall structure is a heterogeneous material structure. The method is used for solving the problem of synchronous heat treatment of integral structure partitions of heterogeneous materials.

The invention discloses a concrete discreteness simulation method, which mainly solves the technical problem that the concrete discreteness is difficult to accurately and truly describe or represent by the existing concrete discreteness test and simulation method. The concrete discreteness is simulated by adopting a random discrete element method, the heterogeneity of the concrete is simulated through random aggregate distribution in consideration of the fact that the concrete is an anisotropic heterogeneous material and the tensile softening effect of the concrete in the fracturing process, and a linear softening model is given to contact between particles; the spatial distribution change of the bonding strength between the matrix and the aggregate is introduced into a random field, so that the sensitivity analysis of random parameters COV and SOF is carried out, and the influence of the aggregate content on the strength discreteness is also carried out. The concrete aggregate distribution and the strength randomness of the interface transition area are considered at the same time, so that the uncertainty and the failure mechanism of the uniaxial compressive strength of the concrete can be excellently reproduced, and the discreteness of the concrete can be truly and reliably simulated.

The invention relates to the technical field of industrial control, in particular to a shear parameter self-adaptive control method and system for a multi-hardness material, and the method comprises the steps: carrying out the pre-pressing of a to-be-processed material, applying a micro-amplitude disturbance signal, and extracting the complex impedance spectrum characteristics of a dynamic mechanical response to construct a frequency domain fingerprint of an internal heterogeneous structure; based on the fingerprint, predicting load abrupt change, and generating a virtual control track taking the displacement of the shearing tool rest as a benchmark; calculating a feed-forward torque compensation amount by using a prediction trajectory planner, and superposing the feed-forward torque compensation amount with a position feedback adjustment amount to generate an optimal blade gap and shearing speed cooperative motion instruction adaptively matched with the current hardness; according to the method, nondestructive detection of the internal hardness mutation of the material is achieved through the frequency domain fingerprint technology, the driving torque and the mechanical gap are synchronously adjusted before shear mutation occurs by means of a feedforward compensation mechanism based on inverse dynamics, and the problems of response lag and easy tipping in heterogeneous material processing are solved.

The invention discloses a three-dimensional heterogeneous material simulation method, system and equipment based on near-field dynamics, and the method comprises the following steps: carrying out model discretization: according to a set particle size distribution requirement, gradually generating aggregate particles with different particle sizes according to the particle sizes from large to small; distance verification is carried out on each newly generated aggregate particle in the generation process, three-dimensional random deformation is carried out on the shape of the aggregate particle, and generation of the current particle size is ended when the aggregate particle meets a termination condition; marking an aggregate area and a cementing material area; configuring material attributes; carrying out heterogeneous near-field dynamics simulation; according to the method, random distribution of particles can be simulated, interaction and heterogeneous characteristics between materials can be truly represented, the authenticity and precision of simulation are effectively improved, reliable support is provided for research and optimization of a complex material system in engineering application, and particularly deep analysis of heterogeneity and material behaviors in the complex material system is achieved.

The present application relates to the field of industrial control technology, in particular to a shear parameter adaptive control method and system for multi-hardness materials, which comprises pre-pressing and applying a micro-disturbance signal to the material to be processed, extracting the complex impedance spectrum characteristics of the dynamic mechanical response to construct the frequency domain fingerprint of the internal heterogeneous structure; predicting the load mutation based on the fingerprint to generate a virtual control trajectory based on the shear knife holder displacement; using a predictive trajectory planner to calculate the feedforward torque compensation, superimposing it with the position feedback adjustment amount to generate the optimal blade gap and shear speed cooperative motion instruction adaptive to the current hardness; the present application realizes non-destructive detection of internal hardness mutation of the material through frequency domain fingerprint technology, and uses the feedforward compensation mechanism based on inverse dynamics to adjust the driving torque and mechanical gap synchronously before the shear mutation occurs, solving the problems of response lag and easy blade collapse in the processing of heterogeneous materials.

The invention provides a shear instability criterion method for a heterogeneous material, which specifically comprises the following steps: (1) carrying out mechanical property test on a jet material under various dynamic conditions to obtain a JC dynamic constitutive relationship of the heterogeneous material; (2) performing disturbance analysis on the material on the basis of the JC dynamic constitutive relation to obtain a shear instability criterion of the material; and (3) substituting the JC dynamic constitutive parameters into a shear instability criterion to obtain the critical strain of the shear instability of the material. The method is reasonable in conception, fully considers the influence of the material multiphase inclusion and the strain gradient effect on the shear instability, can be widely applied to various novel heterogeneous materials, and can efficiently and accurately obtain the shear instability criterion at low cost.

A capacitive sensor is provided for measuring the thickness of powder layers created by powder spreading machines across a variety of applications and for measuring the thickness of inhomogeneous materials. The sensor consists of two or more measuring electrode pairs that are at different distances from the powder layer or material of interest. The measuring electrode pairs are used in combination to measure the distance to the surface of the powder layer or material of interest independent of the density and material composition of the powder layer or material of interest.

Method for performing a strain measurement on a component (10), wherein a strain gauge (12) is attached to the surface of the component (10) and the strain measurement on the component (10) is carried out using the strain gauge (12). The component (10) consists, at least in the area of ​​the component (10) where the strain gauge (12) is attached to the surface of the component (10), of an anisotropic and / or inhomogeneous material, wherein the anisotropy and / or inhomogeneity of the material is caused, at least substantially, by the fact that the material has components (14) which are arranged in the material in such a way that they form a regular pattern of periodically repeating structures.Before attaching the strain gauge (12) to the component (10), the pattern is detected with a detection device in an area where the strain gauge (12) is to be attached to the surface of the component (10), and the exact position and / or orientation in which the strain gauge (12) is attached to the surface is selected depending on the detected pattern.

The invention belongs to the technical field of computational material science and engineering simulation, and relates to a method and related equipment for generating a spatial continuous material attribute field from a heterogeneous material, and the method comprises the following steps: carrying out overlapping sampling in the whole domain of a voxel domain model, obtaining a plurality of overlapping representative volume unit samples, carrying out homogenization calculation, and obtaining a homogeneous material attribute field; obtaining each equivalent engineering constant set and a material principal axis direction vector, performing interpolation processing by adopting a multi-quadratic radial basis function, respectively generating a continuous engineering constant scalar field and a material principal axis vector field of each grid point in a global domain, establishing a global stiffness matrix under a global coordinate system, and performing inverse conversion to obtain a global stiffness matrix of the global coordinate system. The spatial continuous material attribute field of the heterogeneous material is obtained, the problems of continuity and physical rationality of spatial characterization of the attributes of the heterogeneous material are effectively solved, errors and inconsistency caused by manual intervention are greatly reduced, the repeatability and efficiency of data processing are improved, and the method is suitable for large-scale popularization and application. And automation and standardization of the whole process from microstructure data to macroscopic simulation input are realized.

A crushing tooth arrangement on the circumference of the two rollers or rotors of a roller or rotor crusher with crushing teeth arranged in rows of teeth, wherein a row of teeth is described by a shortest and geometrically simplest connecting line of all teeth in an axial direction and a radial direction running along the circumference of the roller or rotor, wherein the connecting lines of the rows of teeth (1) of the rollers or rotors are arc-shaped, continuously differentiable lines and have opposite offset angle profiles (8) in the axial direction, which correspond to the profile of an axial mass flow (8) required to homogenize an inhomogeneous material distribution (6) along the length of the rollers or rotors, characterized in that the rows of teeth (1) have parabolic profiles (10) in the axial direction.

The invention discloses a structural performance and failure simulation connection method for a laser welding position of a plastic part, which comprises the following steps of: establishing a heterogeneous material gradient model, and establishing the heterogeneous material gradient model of a welding area based on experimental data to reflect the gradient distribution of elastic modulus and yield strength; an interface failure simulation unit is embedded, a zero-thickness cohesive unit is inserted into a welding interface, and interface failure behaviors are defined through the bilinear traction separation law. According to the method, through the synergistic effect of heterogeneous material gradient model establishment and interface failure simulation unit embedding, the final simulation error is reduced by 30% or above, the crack initiation position and the expansion path can be accurately predicted, and the quality and reliability of a welding structure can be evaluated more accurately; the risk and cost of product development are also reduced, and the method has wide application prospects and important economic value.

The invention discloses a material size automatic measurement method and device, and the method comprises the steps: predicting a sound wave emission parameter with an excellent sound wave reflection signal receiving effect of a product material, and obtaining a sound wave reflection signal and corresponding timestamp information; identifying a sound wave reflection source type of the sound wave reflection signal, and determining that the sound wave reflection source is a frequency spectrum characteristic of the sound wave reflection signal of the product material; identifying the reason of deviation of the sound wave reflection signal of the product material; the heterogeneity coefficient of the heterogeneous material is calculated, the propagation speed of the sound wave signal in the current heterogeneous material is corrected, and the thickness size of the single-layer product material and the thickness size of the multi-layer combined material are determined; and evaluating whether the technological parameters and the production parameters meet the production stability requirements after adjustment. The invention discloses a method and a device for automatically measuring the size of a material, which are used for enhancing the intelligence and automation level of product material detection and meeting the requirements of high-precision and nondestructive detection and high-efficiency production.

The invention belongs to heterogeneous material performance testing, and particularly relates to a method for predicting torsional stress of a heterogeneous forge piece. The method for predicting the torsional stress of the heterogeneous forge piece comprises the following steps: substituting the radius of the heterogeneous forge piece, the radius of a core performance uniform area of the heterogeneous forge piece and the gradient change slope of the torsional stress into a formula A to obtain the torsional stress of the heterogeneous forge piece. According to the method, the torsion stress gradient coefficient is introduced, integration and averaging are carried out on the non-uniform region of the heterogeneous forging, and the problems that the torsion performance of the large forging is inconvenient to measure and inaccurate in prediction are solved.

This invention relates to a method for measuring the sound velocity of materials based on an envelope cross-correlation algorithm, belonging to the field of automated detection technology. It addresses the problem of severe waveform distortion interference in existing sound velocity measurements of internally inhomogeneous materials. The method includes the following steps: initialization settings and benchmark acquisition; point-by-point scanning of the current scanning surface of the sample to obtain sample echoes; plotting the sound velocity distribution map of the current scanning surface of the sample; rotating the sample to continue measurement until the detection of three orthogonal surfaces is completed; and obtaining the average sound velocity of the sample. Applying this material sound velocity measurement method can eliminate interference from scattering attenuation and dispersion effects caused by material anisotropy, reduce "period jump" errors caused by carrier phase ambiguity, effectively improve the signal-to-noise ratio of the detection signal, achieve automation and high repeatability of sound velocity measurement, and improve the accuracy of identifying minute sound velocity differences.