30 results about "Plastic yielding" patented technology

The invention discloses a support method of a sharp inclined seam roadway. The support method includes the steps that firstly, anchor bolt support is performed, when the roadway is excavated, tunnel face dangerous rocks are removed, an anchor rod installation position is arranged in the direction perpendicular to the inclination of a seam, drilling is performed in the radial direction of the roadway with a drilling machine, and an anchor rod is installed; secondly, spraying net support is performed, a reinforcing mesh is hung on the periphery of a roadway hole and is firmly welded to the anchor rod and an anchor cable; thirdly, roadway bottom arch anchor spraying mesh support is performed, after a bottom arch is excavated according to a designed section, the reinforcing mesh is hung again, and whitewashing support is performed; fourthly, U-shaped steel closing and looping support is performed, U-shaped steel is closed to form a loop, the bottom-body-top mounting sequence is adopted, four pieces of U-shaped steel are symmetrically installed and connected into the loop, and the bottom U-shaped steel and the body U-shaped steel are in lap joint and controlled at the arch waist part; fifthly, base plate backfilling is performed, after backfilling, the base plate is flat, the front gradient and the rear gradient are consistent, and a rail is firmly padded and cannot be suspended. The support method of the sharp inclined seam roadway is simple and convenient to conduct, operation is simple, the effect is obvious, and cost is low. A support structure is safe and reliable, generated surrounding rock plastic yielding area is reduced by more than 70 percent or more compared with a conventional support, and long-term safety and stability of the roadway support structure are ensured.

The invention discloses a metal material plastic yield strength detection device, comprising a main body of a testing machine, a lower beam is installed on the lower end of the bracket of the main body of the testing machine, a lifting upper beam is arranged on the upper end of the bracket, and the upper surface of the lower beam is The middle position and the middle position of the lower surface of the lifting upper beam are fixedly installed with a collet mechanism, and the collet mechanism includes an outer casing, the upper end of the outer casing is provided with installation openings on both side walls, and the inner wall of the outer casing is provided with installation openings. A plurality of sliding rails are evenly arranged on the upper end in a circumference, and sliding sector-shaped clamping blocks are slidably installed on the sliding rails. A vertically arranged hydraulic telescopic rod is fixedly installed at the position, and a lift plate is fixedly installed at the top of the hydraulic telescopic rod. The chuck mechanism of the invention is convenient for clamping the plate-shaped metal material, and can also clamp and fix the column-shaped metal material at multiple points, so that the clamping is firm and easy to use.

The invention provides a medium temperature deformation nanometer austenite enhanced plasticized steel and a preparation method thereof, belonging to the technical field of high-strength high-plasticity automobile steel sheet materials, section bars and rods and wires. The steel comprises the following chemical components by mass: 0.03 to 0.39 wt% of C, 2.0 to 9.0 wt% of Mn, 0 to 2.0 wt% of Al, 0 to 2.0 wt% of Si, 0 to 2.0 wt% of Cr, no more than 0.020 wt% of P and no more than 0.02 wt% of S, with the balance being Fe and unavoidable impurities. The steel may further comprise one or more elements selected from the group consisting of 0.1 to 3.0 wt% of Ni, 0.1 to 0.8 wt% of Mo, 0.5 to 2.0 wt% of Cu, 0.0005 to 0.005 wt% of B, 0.02 to 0.10 wt% of Nb, 0.002 to 0.25 wt% of N, 0.05 to 0.25 wt% of Ti, 0.02 to 0.25 wt% of V, 0.002 to 0.005 wt% of RE and 0.005 to 0.03 wt% of Ca. The invention has the following advantages: sizes of austenite and ferrite of the steel are in a range of 50 to 250 nm; low cost, easy production, high strength and high plasticity are realized; the steel has yield strength of 0.6 to 1.3 GPa, tensile strength of 1.0 to 1.5 GPa and plasticity of 20 to 50% and has good low-temperature toughness.

The present invention relates to the field of material detection, and discloses a metal material plastic yield strength detection device, which includes a universal material testing machine. The universal material testing machine is provided with a sliding track, and a fixture is slidably connected to the sliding track through a sliding assembly. The sliding assembly includes a sliding block slidably connected on the sliding track, an adsorption block arranged on the fixture, the adsorption block and the sliding block attract each other, and a fixed block is arranged on the universal material testing machine. Blocks and snap blocks attract each other. The invention has the effect of facilitating the detection of metal materials.

The invention discloses a damper and the application method, in particular to a braced shear wall coupling beam energy dissipating damper and the application method. The damper comprises a mutual connection plastic yield energy dissipating work area and a keeping approximate rigidity partial fixing area, two or more than two column strip-shaped holes are arranged in work area; non-sharp corner processing is adopted at the upper ends of the strip-shaped hole. The application method of the damper for shear wall coupling beam energy dissipating comprises: the reinforced concrete coupling beam isreplaced by one or more than one damper; or one or more damper is adhered to the reinforced concrete coupling beam and is positioned at the coupling beam of the shear wall. Each damper work area is provided with anti out-plane instability bolt to prevent the out-plane of each damper from instability; each damper partial fixing area is pre-stretched by high strength bolt, or each damper is welded into a whole body by cap cover plate.

The invention provides a three-dimensional lattice material based on electron beam selective melting technology, which includes a three-dimensional structure formed by superimposing a plurality of basic units. The basic unit is composed of a plurality of isosceles triangles. The tops of the isosceles triangles overlap each other, the waists of the isosceles triangles are solid rods, the rest of the isosceles triangles are phantoms, and there is a waist overlapping between two adjacent isosceles triangles; the three-dimensional three-dimensional The material of the structure is pure titanium or titanium alloy. The invention also provides a method for preparing the lattice material. The three-dimensional lattice material provided by the present invention is mainly composed of a plurality of basic units superimposed. After being processed by electron beam selective melting, vacuum annealing, and chemical corrosion, it has stable compression performance, and its compression curve shows obvious plasticity. The yield platform shape provides a stable and reliable calculation basis for structural designers.