10 results about "Bauschinger effect" patented technology

The application relates to a metal sheet material performance test technology and discloses a method for predicting Bauschinger effect of a metal sheet by using a BP neural network, which comprises the following steps: 1) constructing a finite element simulation model of a pre-tension three-point bending continuous deformation process of the metal sheet, and designing a pre-tension three-point bending test to verify the reliability of the finite element model; 2) obtaining a sample set containing a load displacement curve of an imaginary sheet material and a Bauschinger effect mapping relationship through finite element model simulation and theoretical calculation; 3) constructing a Bauschinger effect prediction model based on the BP neural network, and training the Bauschinger effect prediction model by using the sample set; and 4) obtaining a load displacement curve of a to-be-tested metal sheet by using a pre-tension three-point bending test, inputting the load displacement curve into the trained BP network Bauschinger effect prediction model, and predicting the Bauschinger effect of the to-be-tested metal sheet. Compared with other determination methods of the Bauschinger effect of the metal sheet, the application has the advantages of lower cost, simpler operation, fewer influencing factors and higher parameter accuracy.

The present application relates to the technical field of marine steel plate resistant to Bauschinger effect, in particular to a kind of marine steel plate resistant to Bauschinger effect FH47 and manufacturing method thereof.Ni~Cu~Sn~Nb~V multi-component microalloying composition system is used, combined with casting machine heavy pressing, multi-directional forging, multi-stage gradient heating and two-stage controlled rolling and controlled cooling process, high-performance marine steel plate with excellent resistance to Bauschinger effect is developed.The yield strength attenuation rate of the steel plate is less than or equal to 15% under the condition of 2% residual strain, the resistance to Bauschinger effect is excellent, the uniform elongation is greater than or equal to 10%, and the comprehensive mechanical properties are significantly improved.The yield strength of the steel plate after controlled cooling treatment is greater than or equal to 460MPa, the tensile strength is 540~720MPa, the elongation is greater than or equal to 26%, and the core transverse charpy impact energy at-60 DEG C is greater than or equal to 150J.

Disclosed are a 1000 MPa steel plate used for marine engineering and having excellent Bauschinger effect resistance and a preparation method therefor, relating to the technical field of steel material preparation. The 1000 MPa steel plate used for marine engineering and having excellent Bauschinger effect resistance according to the present invention comprises the following components: 0.06-0.14% of C, 0.15-0.4% of Si, 0.9-1.3% of Mn, less than or equal to 0.02% of P, less than or equal to 0.01% of S, 0.02-0.06% of Als, 7.0-12.0% of Ni, 0.3-0.45% of Cr, 0.3-0.65% of Mo, 0.3-1.2% of Cu, 0.03-0.08% of Nb, 0.08-0.18% of V, 0.01-0.025% of Ti, and the balance being Fe and unavoidable impurities. By means of processes such as high-cleanliness and alloying smelting, two-stage rolling, and multi-stage quenching and tempering, the prepared steel plate for marine engineering has a yield strength greater than or equal to 1000 MPa, a tensile strength of 1030-1250 MPa, an elongation rate greater than or equal to 16%, a Charpy impact energy greater than or equal to 120J at -60ºC, and a Bauschinger effect ratio greater than or equal to 0.9 at 2% residual strain, and can completely meet the service requirements of marine engineering equipment.

The invention discloses a punch forming die optimization regulation and control method based on metal plate springback value monitoring, and relates to the technical field of metal plate punch forming. The method comprises the following steps: collecting springback amount data and technological process variable data, and constructing a representative feature set through preprocessing; constructing a springback prediction physical model by combining the material elastic-plastic constitutive relationship and the Bauschinger effect, and constructing a hybrid prediction model by taking the prediction output of the springback prediction physical model as the input of a random forest algorithm; through a Bayesian optimization algorithm, generating initial parameters and optimizing a regulation and control strategy; and issuing a regulation and control instruction to the production line based on an MPC algorithm, performing parameter compensation in real time, continuously collecting production data, updating the hybrid prediction model through adaptive learning, and realizing closed-loop optimization control. According to the method, the advantages of a physical model and a data model are effectively fused, the springback amount of metal plate stamping is greatly reduced through dynamic optimization, precision and the percent of pass are improved, and the method is suitable for production scenes of complex stamping parts such as automobile door reinforcing ribs and automobile anti-collision structural members.

In the crystal plasticity finite element method, it was necessary to represent the crystal orientation in the data in order to determine the anisotropy caused by differences in crystal orientation. Furthermore, many finite element methods using yield functions exhibit isotropic hardening. [Solution] The crystal orientation was changed to represent the Taylor factor M. In other words, for a face-centered cubic lattice, the data for the 12-slip system could be rewritten in terms of the Taylor factor M. Furthermore, by including the deviated back stress, the Bauschinger effect could be expressed. This is not possible for rigid-plastic properties.

The present application relates to the field of steel material preparation, in particular to a 355MPa grade super-thick marine steel plate with anti-Bauschinger effect and a manufacturing method thereof.The steel plate is composed of the following chemical components by weight percentage: C: 0.05%~0.085%, Si: 0.12%~0.25%, Mn: 1.05%~1.45%, P≤0.02%, S≤0.01%, Als: 0.03%~0.05%, Ni: 0.2%~0.7%, Cr: 0.2%~0.4%, Mo: 0.05%~0.3%, Co: 0.1%~0.4%, Nb: 0.01%~0.05%, V: 0.01%~0.05%, Ti: 0.005%~0.01%, N: 0.004%~0.008%, Zr: 0.05%~0.3%, Sb: 0.05%~0.15%, and the rest is Fe and inevitable impurities.The thickness of the finished steel plate can reach 120mm, and the mechanical properties and high service safety performance can meet the service conditions of polar marine engineering equipment, and the steel plate has excellent anti-Bauschinger effect.

The present application relates to the technical field of corrosion-resistant and Bauschinger effect-resistant high-strength marine steel, in particular to a corrosion-resistant and Bauschinger effect-resistant 890MPa-grade marine steel and a manufacturing method thereof. The steel comprises the following chemical components by weight percentage: C: 0.08%-0.14%, Mn: 1.3%-1.8%, Ni: 1.0%-2.5%, Cr: 0.3%-0.8%, Mo: 0.3%-0.8%, and Cu: 0.2%-0.5%. The component design of C, Mn, Ni, Cr, Mo and Cu in combination with micro-alloy elements and special production processes such as electroslag remelting and forging are combined to maintain the mechanical properties of the EH890-grade high-strength steel, reduce the seawater corrosion resistance and marine atmospheric corrosion resistance, and significantly improve the Bauschinger effect resistance.

The invention relates to a repeated stretching-compression experimental device for a Bauschinger effect test of an ultrahigh-strength metal plate, and relates to the technical field of roll bending forming of high-strength steel plates. The device comprises a connecting die shank, an upper die shank locking standby nut, an upper die clamping mechanism, a pressure sensor control system, a continuous tension and compression sample, a lower die clamping mechanism, a lower die connecting bottom plate and the like. By optimizing the design of the clamping mechanism and the pressure sensor system, the device can accurately measure and analyze the influence of the Bauschinger effect on the mechanical property of the material, and the accuracy and reliability of experimental data are improved. In addition, the device is simple in structure, convenient to operate, low in cost, suitable for common universal tensile testing machines and convenient to popularize and apply in common laboratories. According to the method, the precision of finite element numerical simulation is improved, and powerful support is provided for forming process optimization and product quality improvement of the ultrahigh-strength metal plate.

The utility model discloses a sample clamping device for a metal plate circulating tension-shear experiment, belongs to the technical field of metal material mechanical property detection equipment, and is used for clamping a sample in the experiment. According to the technical scheme, an upper pull frame and a lower pull frame are identical L-shaped frames, the L-shaped frames of the upper pull frame and the lower pull frame are oppositely arranged up and down in the same plane, two pull rods are perpendicularly fixed to the middle positions of the top faces of horizontal frames of the upper pull frame and the lower pull frame respectively, and the two pull rods are connected with the stretching upper end and the stretching lower end of a universal tension and compression testing machine respectively. The outer ends of the horizontal frames and the upper ends of the vertical frames of the pull-up frame and the pull-down frame are in sliding connection through guide rods respectively, the two sample fixing bottom plates are connected to the inner side included angles of the L-shaped frames of the pull-up frame and the pull-down frame respectively, and the two sample pressing blocks are located in front of the two sample fixing bottom plates respectively; and the sample pressing block is fixedly connected with the sample fixing bottom plate through the fastening bolt. The device provided by the utility model is simple and reliable, and provides an effective experimental device for researching the problems of material shear strain and Bauschinger effect.

The application relates to the field of steel material preparation, in particular to an ultrahigh-strength marine steel with excellent Bauschinger effect resistance and a manufacturing method thereof. The ultrahigh-strength marine steel is composed of the following chemical components with the weight percentage: C: 0.2%-0.3%, Si: 0.2%-0.4%, Mn: 0.4%-0.75%, P<=0.02%, S<=0.01%, Ni: 1.0%-3.0%, Cr: 0.1%-0.3%, Mo: 0.1%-0.3%, Co: 0.2%-0.45%, V: 0.02%-0.05%, Ti: 0.01%-0.015%, N: 0.004%-0.008%, and the rest is Fe and inevitable impurities. In combination with the special production process of high cleanliness and alloying smelting+continuous casting heavy pressing+forging+high-efficiency rolling+high-temperature normalizing, the thickness of the steel plate finished product can reach 80 mm at most, meanwhile, the strength, toughness and Bauschinger effect resistance of the thick-gauge steel plate are considered, and the uniformity of the core structure of the thick plate is effectively controlled.