13 results about "Slip band" patented technology

The invention relates to a fatigue life prediction method based on a physical failure mechanism in a liquid lead bismuth environment, and the method comprises the following steps: building a representative volume element model, and defining elements belonging to a slip band; defining a crystal plasticity constitutive equation; determining parameters in the crystal plasticity constitutive equation; calculating the average shear strain range of the slip band; carrying out a fracture toughness test to obtain specific fracture energy; establishing a fatigue life prediction model based on a physical failure mechanism; carrying out a symmetrically cyclic low-cycle fatigue test on the metal material in a predicted-temperature high-oxygen liquid lead bismuth environment to determine the thickness of an oxide film; and establishing a fatigue life prediction model in the high-oxygen-concentration liquid lead bismuth environment, and predicting the fatigue life of the metal material in the high-oxygen-concentration liquid lead bismuth environment. According to the method, the fatigue life in the liquid lead-bismuth environment can be predicted by carrying out a low-cycle fatigue test for calibrating crystal plasticity constitutive equation parameters in the air at the predicted temperature and a fracture toughness test in the air and liquid lead-bismuth environment.

The invention relates to multi-layered underpants with a functionally differentiated inner layer and an elastic band element in the thigh area. They comprise an outer layer and two different inner layer materials arranged in distinct zones in the front and crotch areas. This targeted material distribution enables improved adaptation to different stresses such as friction, moisture, durability, and temperature. Additionally, an elastic band element is integrated, which reduces or prevents the underpants from riding up during wear. The combination of the three functionally selected materials optimizes comfort, hygiene, air circulation, and fit, especially in tight-fitting underwear.

The utility model discloses a landslide physical model test device capable of adjusting the softening of a slip band, which comprises a water seepage system and a water supply system, and the water supply system supplies water to the water seepage system; the water seepage system comprises a transparent model box, an experiment simulation slope body is arranged in the model box, the experiment simulation slope body comprises a sliding bed foundation built by bricks and concrete and a front edge sliding surface platform, a drainage hole is formed in the front edge sliding surface platform and penetrates through the bottom of the model box, and a plurality of water seepage modules are arranged on the sliding bed foundation side by side along the slope surface; each water seepage module comprises a water seepage groove support parallel to the slope surface, a plurality of mounting openings are formed in the top of each water seepage groove support at equal intervals along the slope surface, a corresponding transparent water seepage groove is embedded in each mounting opening, and each water seepage groove is filled with a plurality of permeable stones. The change of underground water in a natural environment can be simulated.

The invention provides an accumulation body side slope seismic stability analysis method based on system energy balance, and relates to the technical field of accumulation body side slope seismic stability analysis, and the method comprises the steps: defining a core energy item of a slip mass-slip zone system, comprise total energy of a seismic oscillation input system, damping energy consumption in a sliding body, kinetic energy of the sliding body, friction energy consumption, energy consumption of a sliding belt and gravitational potential energy drop of the sliding body; based on an energy conservation principle, establishing an energy balance equation of a slip mass-slip band system; respectively calculating the specific numerical value of each energy item in the step Q100; verifying whether each energy item meets an energy balance equation or not, and analyzing the seismic stability of the accumulation body slope in combination with the proportional relation between the energy items; according to the method, whether the slope is unstable or not can be judged, key factors of instability can be recognized, and a more scientific and practical technical basis is provided for anti-seismic reinforcement design and risk grading management and control of the accumulation body slope.

The present application relates to a kind of micro-nano indentation contact area deformation test method and device, belong to material microscopic mechanical property testing technical field, its surface to be tested sample is coated with speckle, and directly contact with speckle is used to transparent indenter, the nanometer speckle between indenter and sample is observed by optical microscope, the three-dimensional deformation behavior information of contact area in the process of micro-nano indentation test is obtained, the phenomenon such as crack, extrusion, slip band generation in the existing micro-nano indentation test can be in-situ characterization, and the three-dimensional process model of the deformation behavior of material under indenter is constructed, the method is strong in operability, solve the problem that existing in-situ observation means cannot directly characterize the deformation of contact area in the process of block sample indentation test, improve the understanding of the micro-nano contact mechanical behavior of various materials.

The invention belongs to the technical field of magnesium-lithium alloys, and particularly relates to a magnesium-lithium alloy material and a preparation method thereof. The magnesium-lithium alloy material comprises the following components in percentage by mass: Li, Al, Zn and the balance of Mg, the composite material is prepared at room temperature by adopting a multidirectional compression plastic deformation process. Under the condition that rare metals are not added, aluminum and zinc elements have a synergistic effect with magnesium and lithium, and through subsequent room-temperature multidirectional compression plastic deformation process treatment, the strength of the alloy is improved, and meanwhile, the toughness is well maintained. The improvement of the mechanical property of the magnesium-lithium alloy is based on dislocation movement blocking, and dislocation blocking in multi-directional compression mainly comes from a sliding band formed in a grain boundary and a compression process. The larger the accumulative strain is, the more the dislocations needing to be started for deformation are, and the larger the blocking force is; the staggered moving directions of the multi-direction loading positions are more than those of single-direction loading starting, and the staggered moving directions are more easily hindered by the formed sliding belt. The larger the hindering force is, the more obvious the resistance to the external load is, namely the more obvious the increase of the strength and the hardness is.

The application relates to a fatigue life prediction method based on a physical failure mechanism under a liquid lead-bismuth environment, which comprises the following steps: establishing a representative volume element model and defining elements belonging to a slip band; defining a crystal plasticity constitutive equation; determining parameters in the crystal plasticity constitutive equation; calculating an average shear strain range of the slip band; carrying out a fracture toughness test to obtain a specific fracture energy; establishing a fatigue life prediction model based on the physical failure mechanism; carrying out a low-cycle fatigue test of a metal material under a high-temperature and high-oxygen liquid lead-bismuth environment to determine an oxide film thickness; and establishing a fatigue life prediction model under a high-oxygen-concentration liquid lead-bismuth environment to predict the fatigue life of the metal material under the high-oxygen-concentration liquid lead-bismuth environment. The low-cycle fatigue test for calibrating parameters of the crystal plasticity constitutive equation in the prediction temperature air and the fracture toughness test in the air and the liquid lead-bismuth environment can be carried out, so that the fatigue life under the liquid lead-bismuth environment can be predicted.

A wig apparatus comprising: artificial hair; a mesh cap configured to cover the scalp of a user comprising an inner surface, an outer surface, and a folded portion; an elastic band configured to extend around the user's head comprising an outer elastic band surface, an inner elastic band surface, a bottom band edge and a top band edge; and a silicone strip configured to extend around a circumference of the mesh cap on the inner surface of the mesh cap comprising a top strip edge and a bottom strip edge, the silicone strip coupled to at least a portion of the elastic band.

This invention discloses a preparation process for copper-nickel-silicon alloys for server connectors. This scheme optimizes the proportions of components such as nickel, silicon, and magnesium, and specifically designs the preparation process. Continuous extrusion causes dynamic recrystallization of the ingot, followed by solution treatment to form a supersaturated solid solution. High-density slip bands are generated during cold rolling. During the first-stage aging treatment, the reduction of shear bands promotes the growth of discontinuous Ni2Si phases. Fine cold rolling helps to combine precipitation strengthening and work hardening to achieve a dual-mechanism superposition, further improving the strength and other properties of the copper-nickel-silicon alloy. Second-stage aging helps eliminate internal stress from cold rolling and promotes the precipitation of trace amounts of solute, thereby improving stress relaxation resistance and electrical conductivity. This invention optimizes the component proportions of the copper-nickel-silicon alloy and specifically designs the preparation process, eliminating the need for hot rolling equipment and reducing costs. The prepared copper-nickel-silicon alloy exhibits excellent strength and electrical conductivity.

The utility model relates to a threaded anti-slip thoracic duct with a needle, which relates to the technical field of medical instruments and comprises a thoracic duct, a guide needle, an anti-slip device and a connecting device. The connecting device is fixedly arranged on the side face of the thoracic duct in a sleeving mode, the section of the connecting device is in an isosceles trapezoid shape, external threads are arranged on the side face of the connecting device, and the guide needle is inserted into the thoracic duct; the anti-slipping device comprises a fixing plate and a connecting part, the connecting part is connected to the middle of the fixing plate, a conical hole matched with the connecting device is formed in the connecting part, an inner thread matched with the outer thread is arranged on the inner wall of the conical hole, and the outer thread is connected with the connecting device. Sewing thread locking openings are formed in the positions, located on the two sides of the connecting part, of the fixing plate; the two ends of the fixing plate are each provided with a bandage connecting opening. The threaded anti-slip thoracic duct with the needle has the advantages that the thoracic duct is not easy to shake and fall off, and the safety is improved.

A wig apparatus comprising: artificial hair; a mesh cap configured to cover the scalp of a user comprising an inner surface, an outer surface, and a folded portion; an elastic band configured to extend around the user's head comprising an outer elastic band surface, an inner elastic band surface, a bottom band edge and a top band edge; and a silicone strip configured to extend around a circumference of the mesh cap on the inner surface of the mesh cap comprising a top strip edge and a bottom strip edge, the silicone strip coupled to at least a portion of the elastic band.

This utility model discloses an anti-slip bra, relating to the field of women's underwear. The bra body includes a cup portion and an anti-slip band. Each end of the anti-slip band is connected to a cup portion, covering the inner edge of the cup portion and forming a connection. The two cup portions are detachably connected. The cup portion includes a cup support, a side edge, and a lower edge. The anti-slip band includes two underbands that extend upwards to cover and connect to one of the cup portions. The underbands and cup portions form a connecting surface on the inner sides of the lower edge and side edge. An anti-slip silicone strip is provided on the upper inner side of the cup support. An adjustable interlocking hook-and-eye closure is provided at one adjacent end of the two cup portions. This utility model, by setting an anti-slip band and an anti-slip silicone strip inside the cup support, forms a closed, annular anti-slip path, improving the problem of shifting caused by human movement in existing bras. The adjustable interlocking hook-and-eye closure at the adjacent ends of the two cups prevents compression of the sternum or gaps, and is compatible with different breast shapes such as outward expansion or gathering.

The present invention relates to the technical field of structural strength and fatigue failure analysis, and in particular to a method for predicting the initiation life taking into account the dispersion of grain orientation, comprising: establishing a first number of test piece test sections with different grain orientations, and determining the slip bands of the test piece test sections; setting boundary conditions and fatigue loading conditions for each of the test piece test sections, performing fatigue loading finite element simulation, and obtaining the cumulative shear strain increment; determining the initiation life of each test piece test section based on the slip band corresponding to the maximum value of the cumulative shear strain increment; determining a converged initiation life-cumulative distribution function of the test piece test section from the initiation life, and determining it as an initiation life prediction result taking into account the dispersion of grain orientation; the present invention can accurately predict the initiation life of fatigue cracks in a material.