13 results about "Strain limit" patented technology

The invention belongs to the field of mechanical property testing of metal materials, and relates to a method and a system for detecting tensile strain mark limit, the system applies tensile load to a metal plate sample through a test module, an illumination projection module projects a structured light pattern to the surface of the sample, and an image acquisition module continuously acquires surface images of the sample; and the data processing module is used for carrying out wrapped phase calculation, differential phase calculation, distortion parameter extraction and tensile strain mark initiation judgment on the image sequence, so that accurate positioning at the moment of tensile strain mark initiation and objective and quantitative measurement of the critical strain limit are realized. The method can effectively improve the detection sensitivity and accuracy of the material surface instability characteristics, realizes high-precision judgment at the moment of tensile strain mark initiation, and provides a reliable basis for material performance evaluation and quality control.

This invention discloses a method for joint evaluation and optimization of buckling and bending of arbitrary quadrilateral laminates based on physical information neural networks, relating to the field of composite material structure design technology. The method, for arbitrary quadrilateral laminates, first constructs a method based on classical laminate theory... USA The stiffness matrix explicitly reflects the influence of ply parameters, and a physical domain is transformed to a reference domain through a bitriangular affine mapping to establish a physical information neural network mechanical model. The model is trained with the goal of minimizing the total potential energy or Rayleigh quotient, solving for the buckling factor and layer-by-layer strain limits, and adapting to four typical boundary conditions through a boundary embedding function. Subsequently, using ply angle and thickness as variables, optimization is performed using a genetic algorithm, with the goal of minimizing mass, and the buckling factor and strain limits as constraints. The final output is the optimal ply scheme that satisfies specific boundary conditions. This invention can optimize ply angle and thickness while satisfying buckling stability and strain strength constraints.

To improve the strain limit of a strain gauge.SOLUTION: The strain gauge has a base, a resistor formed on the base, and wiring formed on the base and connected to a terminal end portion of the resistor, wherein the wiring includes a first portion juxtaposed with the resistor with a gap in the grid width direction in a plan view, and, the wiring includes a first metal layer and a second metal layer laminated on the first metal layer, and the second metal layer in the first portion of the wiring protrudes toward a side where the resistive element is disposed in a grid direction as compared with an end portion of the gap.SELECTED DRAWING: Figure 1

The present invention discloses a pneumatic variable stiffness soft gripper, comprising a gripper and a flexible wrist. The gripper has a plurality of variable stiffness fingers, each variable stiffness finger comprising a strain limiting plate, a driving airbag fixed on the outside of the strain limiting plate, and a variable stiffness airbag fixed on the inside. The variable stiffness airbag has a honeycomb-shaped support grid inside, which divides the inner cavity of the variable stiffness airbag into a plurality of cells, and the plurality of cells are connected to a second airway. Each cell is filled with spherical blocking particles. During the grasping process of the soft gripper, the driving airbag is first pressurized by the first airway, the variable stiffness finger is bent, and then negative pressure is applied to the variable stiffness airbag through the second airway, so that the blocking particles are arranged closely, the friction between the particles is increased, and adaptive variable stiffness is achieved. The flexible wrist comprises a bellows, and three third airways are evenly distributed along the circumference of the bellows, so that the flexible wrist can produce good deflection and elongation properties.

A method of treating a metal or metal alloy gas cylinder 10 comprises receiving the gas cylinder 10, the gas cylinder 10 comprising a body 12 defining an internal chamber 14 for storing gas 16 and a neck 18 connected to the body 5 12 and providing access to the internal chamber 14, applying a strain to the internal chamber 14 of the body 12 of the gas cylinder 10, the applied strain being less than an elastic strain limit of a material from which the body 12 of the gas cylinder 10 is formed but greater than 0.2%, forming a surface layer 20 on the internal chamber 14, and releasing the applied strain from the internal 10 chamber 14 of the body 12 of the gas cylinder 10.

This invention discloses a method for designing the three-dimensional strain forming limit path of high-pressure bulging in pipes, comprising the following steps: gridding is applied to the surface of all pipe test pieces; the pipe test pieces are placed in a mold; rubber is placed inside the pipe test pieces, and high-pressure bulging is used to induce a concentrated instability state in the pipe test pieces, causing the portion of the pipe test pieces near the insert mold to burst under high pressure; after bulging, the degree of deformation in the thickness direction is obtained by measuring the change of the grid at the fracture point of the pipe test pieces; the first principal strain and the second principal strain are obtained by measuring pipe test pieces with different structures; multiple forming limit curves are plotted according to the different structures of the pipe test pieces, and the curves are connected to form a surface to obtain a three-dimensional forming limit diagram. This invention fills the gap in the three-dimensional strain forming limit diagram of high-pressure forming of rubber, maintains the integrity of the three-dimensional strain limit of high-pressure bulging of rubber in pipes, and is safe, convenient, efficient, requires fewer molds, and has low cost.

The invention discloses an ultrathin breathable soft strain sensor and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a soft substance substrate with micron-sized thickness and similar soft tissue Young modulus; and S2, based on a particle phagocytosis effect, controllably embedding conductive micro-nano particles on the substrate to form a conductive seepage network, and packaging to obtain the soft strain sensor, and S3, constructing a ventilation channel on the sensor by using a laser etching technology. The method is characterized in that the limitation of chemical non-orthogonality and complex fluid dynamics in a traditional method is effectively avoided by utilizing the particle phagocytic effect, and the strain response controllable conductive network construction is successfully realized on the ultrathin low-modulus soft substrate; according to the method, core performance parameters such as sensitivity, strain limit and hysteresis of the sensor can be accurately regulated and controlled, and the differentiated detection requirements of different parts of a human body on the sensitivity and the strain range are met; meanwhile, the air permeability of the device is remarkably improved through the air-permeable through holes constructed through laser etching, and the overall sensing performance of the device is further optimized.

The application provides an elephant trunk type pneumatic soft body driving device, which comprises multiple soft body driving sections. Each soft body driving section is in the shape of a circular truncated cone and is provided with a strain limiting layer on the surface. The soft body driving sections are sequentially connected to form a circular truncated cone. The soft body driving section with the smallest diameter is a transport end driving section. The transport end driving section is internally provided with multiple grabbing air cavities which are arranged at intervals around the axis. The other soft body driving sections are steering driving sections. Each steering driving section is provided with a support air cavity on the axis and multiple steering air cavities around the support air cavity. The support air cavities of adjacent two steering driving sections are sequentially connected, and the steering air cavities of adjacent two steering driving sections are one-to-one connected. The application has the beneficial effect that different air cavities in the soft body driving sections are inflated to make the transport end driving section grab the target object or transport the target object to a specified position in a three-dimensional space, and various complex grabbing actions can be completed.

The strain gauge of the present invention comprises: a base material; the resistor body is formed on the base material; and a wiring formed on the base material and connected to a terminal portion of the resistor, the wiring including a first portion, the first portion of the wiring being disposed side by side with the resistor in a grid width direction with a gap therebetween in a plan view, and the first portion of the wiring being disposed side by side with the resistor in a grid width direction. The wiring includes a first metal layer and a second metal layer laminated on the first metal layer, and the second metal layer at the first portion of the wiring protrudes further toward the side where the resistor is disposed in the grid direction than an end portion of the void. According to the invention, the strain limit of the strain gauge can be improved.

The invention provides a multi-gait pneumatic snakelike robot based on a fiber interference variable stiffness principle, and relates to the technical field of pneumatic robots, the multi-gait pneumatic snakelike robot comprises a plurality of motion modules which are rotatably connected in sequence; each moving module comprises two pneumatic drivers and three moving frames, each pneumatic driver comprises three pneumatic driving units, in each pneumatic driver, the two pneumatic driving units are horizontally arranged side by side to form a lower driving unit, and strain limiting layers of the lower driving units are located on the relatively close sides; the other pneumatic driving unit is arranged above the two lower driving units and is an upper driving unit, and the strain limiting layer of the upper driving unit is arranged on the upper side face of the upper driving unit. The three moving frames are sequentially arranged at intervals, and the two ends of the three pneumatic driving units of each pneumatic driver are connected with the two adjacent moving frames respectively. The robot has the advantages that each movement unit moves flexibly, different gaits can be completed, multiple movement modes can be achieved, and the robot is suitable for different terrains and task requirements.

This invention relates to a method for winding and forming superconducting magnet coils based on tension zone compensation. The invention divides radial tension compensation zones according to differences in radial layer positions and cryogenic residual strain transmission, transforming the tension control target from a fixed number of layers to a cryogenic strain-sensitive region. The upper and lower limits of residual strain are determined by the strain limits of the superconducting wire, the compression limits of the insulation layer, and the correlation amount of thermal shrinkage of the bobbin, ensuring that the winding tension is synergistically constrained by the wire, insulation, and bobbin. Based on this, non-equivalent tension compensation curves are derived for tension segments within the zones and transition segments between zones, reducing abrupt tension changes between adjacent zones. Therefore, this invention can reduce cryogenic residual strain concentration, lower the risk of superconducting performance degradation, insulation crushing, and interlayer microslippage, and improve coil forming quality and cryogenic operational stability.

The invention provides a pneumatic soft body curling and winding actuator and a manufacturing device thereof.The pneumatic soft body curling and winding actuator comprises a pneumatic soft body curling and winding actuator body, the pneumatic soft body curling and winding actuator body comprises a main body, and the main body is of a three-layer composite structure and comprises a silicone rubber layer, a strain limiting layer and a fiber line layer; the fiber wire layer is wrapped in the inner layer of the multiple silicone rubber layers, and the strain limiting layer is arranged on the outer layer of the silicone rubber layers and is wrapped by at least one silicone rubber layer. The method has the beneficial effects that by adopting a preparation mode of combining liquid dropping casting and fiber reinforcement, a formed main body has a three-layer composite structure, and a three-dimensional curling effect can be realized under the driving of high-pressure gas; corresponding devices are provided for two preparation modes of liquid dropping casting and fiber reinforcement respectively, and errors caused by manual machining in the prior art are avoided.

The utility model provides a compression amount controllable type composite material sealing structure which comprises a metal elastic structure, a deformation limiting structure and a silicon rubber sealing layer, and the metal elastic structure is formed by connecting a plurality of metal plates in a zigzag shape; the deformation limiting structure comprises a connecting limiting rod and a plurality of elastic strain limiting rods, and the elastic strain limiting rods are connected to the two ends of the connecting limiting rod in a staggered mode at intervals in the length direction of the connecting limiting rod; in the assembled state, the connecting limiting rod penetrates through the metal plates, and the open ends of the elastic strain limiting rods deviate from the metal plates in a one-to-one correspondence mode. According to the embodiment, the metal elastic structure is wrapped by the silicone rubber sealing layer, and the compressed metal elastic structure is opened under the action of self-resilience force in the resilience process, so that the resilience performance of the sealing structure is improved. The deformation limiting structure can improve the strength of the sealing structure in the width direction and control the compression amount of the sealing structure.