7 results about "Micro tensile" patented technology

The invention discloses an equivalence evaluation method for testing the fracture behavior of an irradiation metal material based on a small sample, belongs to the field of mechanical property testing, and deeply researches the size effect problems of non-uniform deformation and crack initiation of the metal material under the irradiation condition through three research means of experiments, theories and simulation. And a powerful basis is provided for performance evaluation of the metal material under the irradiation condition. In the aspect of experiments, micro-stretching and micro-cantilever beam experiments of samples with different sizes under irradiation conditions are carried out, and a correlation mechanism between irradiation material crack initiation and sample sizes is analyzed. On the theoretical aspect, a dislocation channel-grain boundary interaction model is established, and prediction of fracture toughness of irradiation samples of different sizes is achieved. In the aspect of simulation, a finite element simulation system for non-uniform deformation, crack initiation and size effect of the metal material under the irradiation condition is established, and the influence of irradiation and sample size on microstructure evolution and macroscopic fracture behavior of the material is explored.

The invention provides an embedded miniature stretching platform for an atomic force microscope in-situ test, and relates to the technical field of material stretching, the embedded miniature stretching platform comprises a base, a transmission case, a transmission unit, a first displacement block, a second displacement block, a third fixed block, a fine tuning block, a fine tuning rod, a force sensor, a temperature control base, a scanning head and the like, and all the parts cooperate to support sample stretching and testing. The motor drives the lead screw to rotate in the same direction through the transmission unit, and the two displacement blocks are driven to move reversely by means of the opposite internal threads of the two lead screw nuts to achieve sample stretching; the first fine-tuning knob drives the fine-tuning rod, the fine-tuning block and the fourth fixing block to move in a small range to adjust the stretching amount, the second fine-tuning knob fixes the fine-tuning effect, and the high-precision in-situ test requirement is met in cooperation with temperature regulation and control and the scanning head.

The invention discloses a corrosion-resistant high-pressure and high-temperature micro tensile loading device and a control method, the corrosion-resistant high-pressure and high-temperature micro tensile loading device comprises a base, a center shaft, an upper clamp and a lower clamp, the cross section of the upper clamp and the cross section of the lower clamp are each of an E-shaped structure, and the upper clamp comprises an upper clamp axial vertical plate and an upper clamp lateral vertical plate; the upper clamp axial vertical plate and the upper clamp lateral vertical plate are fixedly connected into a whole. The lower clamp comprises a lower clamp axial vertical plate and a lower clamp lateral vertical plate, and the lower clamp axial vertical plate and the lower clamp lateral vertical plate are fixedly connected into a whole. The center shaft and the lower clamp are both fixedly connected with the base, the center shaft sequentially penetrates through the upper clamp and the lower clamp and provides accurate coaxial positioning and guiding for the upper clamp and the lower clamp, and the upper clamp freely slides in the axial direction of the center shaft. A first sample and a second sample are simultaneously clamped between the clamp axial vertical plate and the upper clamp lateral vertical plate and between the lower clamp axial vertical plate and the lower clamp lateral vertical plate in parallel, so that a comparison test in a single experiment period is realized.

The application relates to the technical field of heat dissipation materials, and discloses a precision die cutting and detection method for a heat dissipation material, which comprises the following steps: S1, digital modeling of material microstructure and mechanical properties: sampling the incoming material batch, observing the multilayer stacking structure of the material batch by using a scanning electron microscope, measuring the approximate value of the interlayer binding energy, and obtaining the elastic modulus, yield strength and brittle-ductile transition critical thickness in different directions by using a nanoindenter and a micro tensile testing machine; the four core strategies of material digitization, process self-adaptation, process active control and detection intelligentization are used in the application scheme, so that the precision die cutting of graphite sheets is changed from needing the processing experience of workers to a predictable and optimized precision manufacturing engineering driven by a system, and the application scheme is particularly suitable for the fields of 5G equipment, ultra-thin consumer electronics, high-reliability power devices and the like which have extremely high requirements for heat dissipation components.

The invention discloses a nanometer and micrometer cross-scale inlaying composite web forming method which comprises the following steps: S1, preparing raw materials and equipment: adopting PET (Polyethylene Terephthalate) short fibers as micrometer fiber raw materials and adopting DMF (Dimethyl Formamide) (the purity is greater than or equal to 99.5%) and PAN (Polyacrylonitrile) powder with the molecular weight of 80000 + / -5000 as nanometer fiber raw materials, the equipment comprises a carding machine, a photocuring 3D printer with the precision of 0.05 mm, an ultrafast laser, a high-frequency piezoelectric controller and a micro-tensile testing machine; s2, carding the micron fibers into a framework; s3, on-line preparation of nanofibers; s4, cross-scale fiber online inlaying is carried out; s5, low-temperature hot-pressing shaping is conducted, specifically, the primary product of the composite fiber web is fed into a hot-pressing roller, low-temperature hot-pressing is conducted for 15 s at the temperature of 60 DEG C and the pressure of 0.15 MPa, the nanometer and micrometer inlaid structures are cured, and fiber falling in subsequent processing is avoided; and finally, winding by a winding device to obtain a composite fiber web finished product with the breadth of 1500mm. According to the invention, the industrial common problems that the breadth of the existing cross-scale fiber web is smaller than 1m, nano / micron fibers are not uniformly mixed and large-scale production cannot be realized can be solved.

The invention provides a test fixture for a miniature tensile sample, the test fixture comprises an upper chuck assembly, a lower chuck assembly, a rear clamping block assembly, a front clamping block assembly, a centering block and a cross beam connecting assembly, the upper chuck assembly comprises an upper chuck body, a rear wedge-shaped groove, a centering mounting groove and a front wedge-shaped groove. Compared with the prior art, the device has the following beneficial effects that the upper chuck assembly, the lower chuck assembly, the rear clamping block assembly, the front clamping block assembly and the centering block are arranged, the centering block is preliminarily placed in the centering mounting groove, the rear clamping block assembly and the front clamping block assembly are arranged in the rear wedge-shaped groove and the front wedge-shaped groove correspondingly, and the upper end and the lower end of a miniature sample are clamped; centering in the front-back direction is achieved through the wedge-shaped structure, then centering in the left-right direction is achieved through the centering block, lifting adjustment of the upper clamping head assembly and the lower clamping head assembly is completed through the testing machine cross beam, and therefore rapid clamping use of a miniature sample can be achieved.

This invention discloses a method for preparing and applying an anti-adhesion composite film, comprising: firstly, rolling a primer onto a heat-sealing substrate and drying and curing it, and then applying a topcoat onto the primer layer; the key is that, before the primer and / or topcoat are fully cured, the composite structure is micro-stretched by 0.5%–3%, thereby forming fine textures with a width of 20–200 nm and a depth of 5–50 nm in situ on the coating surface. This improves the anti-adhesion performance of the composite film and effectively solves the problem of residue of highly viscous contents inside packaging.