62 results about "Strain limit" patented technology

The invention discloses a gear which comprises a gear surface part and a non-gear surface part, wherein at least the gear surface part is made of amorphous alloy, also the vikers hardness value of the amorphous alloy is greater than 4.5GPa, and the elastic strain limit is greater than 0.5%. Therefore, the gear is divided into different parts by the inventor of the invention, at least the gear surface part (namely the part bearing friction and strain load mainly) is prepared by utilizing the specific amorphous alloy, the service life of the gear is prolonged, and the manufacturing cost of the gear is lowered.

Sheet metal parts having significantly strained portions, such as aluminum alloy body panels, can be formed by a sequence of steps comprising preform shape stamping, preform annealing and final shape stamping. The shape of the desired part is analyzed to identify portions of the geometry that cannot be formed in a single stamping step without exceeding the straining limit of the metal. A preform shape is determined in which a substantial amount of strain is stamped without tearing and the preform is annealed to re-soften the strained areas and a final stamping step completes development of the final part shape.

A conductive hinge is made of a superelastic shape memory alloy such as nitinol (NiTi) having a large elastic strain limit for enabling the hinge to bend to a small radius during stowage and flexible return to a trained rigid hinge position by training the shape memory alloy to assume a predetermined deployed configuration when released from a stowage configuration. The hinge is trained by forging at a temperature above a training temperature. The hinge is stowed and released in the superelastic state to deploy solar cell panels as the hinges unfold to the trained deployed configuration.

The invention discloses a soft human-simulated finger and a preparing method thereof. One end of the soft human-simulated finger is a finger tail end (5A), and the other end of the soft human-simulated finger is a finger root (5B); an airflow guide pipe (2) is mounted on the finger root (5B), and after a strain limiting layer (30) is spliced on a bottom face board of a hollow base body (3), clockwise and anticlockwise winding lines are wound around the hollow base body to form a fiber enveloping layer (4); and an outer skin layer (1) is formed in an injection molding manner. An air bag (3A) is arranged in the middle portion of the hollow base body (3), and is filled with gas or liquid with a certain pressure, and therefore the soft human-simulated finger deforms. The material young's model of the designed soft human-simulated finger is 250 kPa, the hardness of the soft human-simulated finger approximates to the hardness of human body skin, maximum bending displacement of the single soft human-simulated finger can reach 100 mm, and the output force can reach 4 N.

The invention discloses a graphene pressure sensor array system and a preparation method thereof. The sensor array comprises an array circuit board and an array circuit which is arranged on the array circuit board. The array circuit board is provided with a plurality of graphene pressure sensing units which are connected with the array circuit. The graphene pressure sensing unit converts an acquired signal to a pressure value by means of a signal acquiring and processing system. Each graphene pressure sensing unit comprises a graphene layer, a force-sensitive film which is obtained through combining elastic polymer layers, and electrodes at two ends of the force-sensitive film. Through adding one layer of elastic polymer, the strain limit of the graphene layer is increased, thereby extending a measuring range which can be detected by the sensor.

The invention provides a snakelike wound software actuator, which is aimed at solving the problem that a software robot is still in a research stage and needs to be further expanded. The snakelike wound software actuator comprises an elastic corrugated pipe, a strain limiting layer, an elastically stretchable layer, a fixed connecting piece, and an air passage pipe for connection with an air source. The novel snakelike wound actuator provided by the invention covers a wound actuator with the strain limiting layer and a wound actuator without the strain limiting layer. The winding performance of the snakelike wound actuator with the strain limiting layer is determined by depending on the strain limiting layer and the elastically stretchable layer; the snakelike wound actuator with the strain limiting layer can wind a long and thin rod rapidly and efficiently; and with the increase of inflation pressure, the snakelike wound actuator winds an object more tightly and can lift a 1.3kg object. The wound actuator without the strain limiting layer is relatively light and soft; the winding manner of the actuator is determined only by depending on the fixed orientation of the elastically stretchable layer; and the wound actuator without the strain limiting layer can also wind and lift the object.

A hub assembly for coupling different grasper assemblies including a soft actuator in various configurations to a mechanical robotic components are described. Further described are soft actuators having various reinforcement. Further described are and soft actuators having electroadhesive pads for improved grip, and / or embedded electromagnets for interacting with complementary surfaces on the object being gripped. Still further described are soft actuators having reinforcement mechanisms for reducing or eliminating bowing in a strain limiting layer, or for reinforcing accordion troughs in the soft actuator body.

A technique of monitoring strain on a printed circuit board assembly involves the use of a strain detector mounted on a printed circuit board. The strain detector is formed of a non-ductile material. The strain detector has a narrowed portion forming a weak link that has a characteristic of breaking when a critical strain limit is exceeded. The method of monitoring can include visual or electrical inspection. The electrical inspection can include having a strain monitoring device. The strain monitoring device has a timer connected to at least one strain detector and a memory for storing results connected to the timer. The capacitance of at least one of the strain detectors is sampled and any change in capacitance is recorded to the memory. In one embodiment, a time stamp occurs in the memory based on when an electrical property changes across at least one of the strain detectors.

Metallic dental prostheses made of bulk-solidifying amorphous alloys wherein the dental prosthesis has an elastic strain limit of around 1.2% or more and methods of making such metallic dental prostheses are provided.

The present invention employs a shape memory alloy that exhibits a two-way shape memory effect and that has a stress-strain property that, in a stress-strain diagram, the stress-strain curve comprises a gentler gradient portion extending with relatively small gradients and a steeper gradient portion extending with relatively great gradients. The shape memory alloy is operated in the region surrounded by the gentler gradient portion, the steeper gradient portion, a practical stress limit line, a straight line connecting the intersection of the practical stress limit line and a strain limit line near shape recovery completion on which the strain of the shape memory alloy reaches a specified value in a state close to the shape recovery completion and the point where the strain is zero at a low temperature in the stress-strain diagram.

Sheet metal parts having significantly strained portions, such as aluminum alloy body panels, can be formed by a sequence of steps comprising preform shape stamping, preform annealing and final shape stamping. The shape of the desired part is analyzed to identify portions of the geometry that cannot be formed in a single stamping step without exceeding the straining limit of the metal. A preform shape is determined in which a substantial amount of strain is stamped without tearing and the preform is annealed to re-soften the strained areas and a final stamping step completes development of the final part shape.

It is a primary object of the present invention to provide a suspension substrate having reduced strain. The present invention solves the problem by providing a suspension substrate comprising: a fundamental structure in which a metal substrate, a first insulation layer, and a wiring are laminated in this order; a wide wiring laminate structure provided with a wide wiring first insulation part of the first insulation layer, a first wide wiring formed on the wide wiring first insulation part, a second insulation part formed on the first wide wiring, and a second wide wiring formed on the second insulation part; and a narrow wiring-containing structure provided with a narrow wiring first insulation part of the first insulation layer and a first narrow wiring formed on the narrow wiring first insulation part, wherein the narrow wiring-containing structure is provided with a strain-limiting part formed to limit strain generated in relation to the wide wiring laminate structure.

The invention discloses a thermal barrier coating preparation method with the columnar crystals coating to solve the problem of non-crystal coating and low anti-thermal in normal plasma spraying for the LaTi2Al9O19 ceramic material. It changes the distance and the technique data of the tack coat and ceramic powder channel in the normal plasma spraying process, so the thermal barrier coating of the LaTi2Al9O19 with the stable energetic and the columnar crystal structure. The thermal isolation temperature is 130deg.C-300deg.C and improves the strain limit and anti-thermal character, the hot circle life can reach above 1500 times and improves by 4 times.

A soft robotic device with a variety of sensors and / or imaging areas is described. The sensor and / or imaging area may be embedded in the soft body or the strain limiting layer of the soft robotic device, attached to the soft body or the strain limiting layer of the soft robotic device, or otherwise linked to the soft body or the strain limiting layer of the soft robotic device.

The invention discloses a classified strain limiting-based dynamic cloth simulation method. A strain limiting method is applied to dynamic cloth simulation, so that a distortion phenomenon in the simulation can be prevented. The method comprises the main following steps of: calculating a cloth simulation animation by using the knowledge of dynamics, and identifying an oscillation and excessive deformation area; processing the identified area by using an improved strain limiting method; and performing collision detection and response. Due to the adoption of the improved strain limiting method,the problems of oscillation and excessive deformation in the dynamic cloth simulation are solved, the problem of cloth visual effect distortion caused by the oscillation and the excessive deformationin the dynamic cloth simulation is solved, and the phenomenon that cloth is deformed to produce a viscous feeling and is levitated on the skin of a human body without additional damping force is avoided.

A method is provided for forming a panel from a metal alloy sheet having known stress-strain forming properties including a forming strain limit that is exceeded when a single forming operation is used to form the panel. The method comprises determining a stress relieving treatment and an incremental forming treatment for forming the panel. The total incremental forming strain comprises a first strain increment. The stress relieving treatment results in the total incremental forming strain remaining within the forming strain limit. A first preform shape is determined in which the geometry of the shape does not exceed the first strain increment. The sheet is formed into the first preform shape. The first preform shape is then stress relieved. The first preform shape is then formed into a panel shape having a geometry that is within the total incremental forming strain.

The present invention employs a shape memory alloy that exhibits a two-way shape memory effect and that has a stress-strain property that, in a stress-strain diagram, the stress-strain curve comprises a gentler gradient portion extending with relatively small gradients and a steeper gradient portion extending with relatively great gradients. The shape memory alloy is operated in the region surrounded by the gentler gradient portion, the steeper gradient portion, a practical stress limit line, a straight line connecting the intersection of the practical stress limit line and a strain limit line near shape recovery completion on which the strain of the shape memory alloy reaches a specified value in a state close to the shape recovery completion and the point where the strain is zero at a low temperature in the stress-strain diagram.

The invention discloses a method for evaluating elasticity of oil well cement stone. The method comprises the following steps: (1) preparing and prefabricating cement paste for contrast, and pressing and curing to obtain cement stone; (2) drawing an axial stress-axial strain-radial strain-volume strain curve of the cement stone; (3) calculating Young modulus of the cement stone, thereby acquiring flexibility; (4) confirming an elastic strain limit of the axial strain through a knee point of the volumetric strain curve of the cement stone, drawing a vertical line to a horizontal axis from the elastic strain limit point, thereby forming a triangle by the vertical line, the axial strain curve and the horizontal axis, and calculating the area of the triangle, thereby acquiring elastic strain energy; (5) taking the flexibility as a horizontal coordinate and the elastic strain energy as a vertical coordinate, drawing a rectangular coordinate system, wherein a first quadrant is taken as a cement stone elasticity chart; and (6) dividing an elasticity comparison region on the elasticity chart at an elasticity coordinate point of certain cement stone and comparing elasticity magnitudes. According to the method provided by the invention, the elastic effects of common oil well cement and elasticity and toughness modified cement are directly and clearly evaluated; the test is simple; the cost is low; the popularization is easy.

The invention belongs to the field of related technologies of wrist rehabilitation soft robots, and discloses a sectional type multi-degree-of-freedom soft actuator for human wrist rehabilitation training, which comprises a left single cavity and a right single cavity which are connected to each other, and the left single cavity and the right single cavity are in mirror symmetry; the left single cavity comprises an air inlet fixed end, a bent section, a swing section, a bent section strain limiting layer and a swing section strain limiting layer; the fixed end is connected to the bent section,and the fixed end and the bent section are arranged on the bent section strain limiting layer; the bending section is basically rectangular, a plurality of first grids arranged at intervals are formed on the side, away from the bending section strain limiting layer, of the bending section, and the multiple first grids are arranged at intervals in the length direction of the bending section; the swing section is arranged on the swing section strain limiting layer, a plurality of second grids are formed on the side, away from the swing section strain limiting layer, of the swing section, and the second grids are arranged at intervals in the length direction of the swing section. According to the invention, multi-degree-of-freedom motion can be realized, the cost is low, and the applicability is high.

The invention relates to a friction nano generator and a self-driving strain sensor and application thereof. The friction nano generator comprises a conductive friction structure comprising a conductive friction layer; and a friction structure disposed at intervals with the conductive friction structure, wherein the friction structure comprises a dielectric friction layer disposed opposite to theconductive friction layer, the conductive friction layer contacts with-separates from the dielectric friction layer under the action of a first external force to generate electrical output and the conductive friction layer generates strain under the action of a second external force so that the resistance of the conductive friction layer changes, and at least one of the contact area, the contact separation frequency and the amplitude parameters of the conductive friction layer and the dielectric friction layer changes, thereby generating the electrical output capable of characterizing the strain. The vibration energy or the wind energy is effectively utilized to realize self-driving sensing so as to have potential application value in the characterization of the strain and the force generating strain and the strain limit alarm.

The invention discloses a non-Newtonian fluid pneumatic soft touch hand and a forming method thereof. The non-Newtonian fluid pneumatic soft touch hand is composed of a touch hand and a chassis assembly, wherein the upper part of the touch hand is equipped with a strain-layer actuating cavity of a concave-convex structure, the middle part of the touch hand is equipped with a strain limiting layer,the lower part of the touch hand is equipped with a cuboid damping cavity with a separating plate, a gas cavity is arranged between the upper part and the middle part, and non-Newtonian fluid is arranged between the middle part and the lower part; when gas pressure is inflated into the actuating cavity, strain of the middle strain limiting layer part is smaller than that of an upper part actuating cavity unit, and therefore, the touch hand is laterally bent towards the strain limiting layer; and meanwhile, a lower part damping cavity unit is driven to bent, so that non-Newtonian fluid sealedin the damping cavity unit bears shearing stress. Viscosity of the non-Newtonian fluid generates changes along with a shearing rate, so that damping is generated, and therefore, an unstable phenomenongenerated in a bending process of the touch hand bearingexternal disturbance is eliminated. Moreover, stable control can be performed in a complex environment, so that target action is effectively accomplished.

A multi-layer bell is formed from the outer shell of a multi-layer pipe in a secondary process, thereby allowing the extrusion process to be conducted at normal speeds. The bell may include a strain limiting membrane fused or mechanically secured between the outer shell extrusion layer and the inner liner extrusion layer, increased hoop or circumferential stiffness. This invention allows the extrusion process to be in its simplest form, with no adjustments to the corrugator or extruder speeds.

The invention discloses an imitation snake soft-bodied rod-climbing robot and application thereof, and belongs to the field of soft-bodied robots. The imitation snake soft-bodied rod-climbing robot has the advantages of having simple structure, stable and reliable, low cost, and light weight, and can be used in high pressure inspection, nuclear power plants and other special environments. The imitation snake soft-bodied rod-climbing robot comprises a spiral winding unit and an expansion unit, the spiral winding unit comprises a first elastic bellows, a strain limiting layer, an elastic expansion layer, a fixing connector, and a first air circuit tube for connecting with an air source, the first elastic bellows is a closed tube body, the first elastic bellows is connected with the first aircircuit tube, the air source can inflate and deflate into the first elastic bellows through the first air circuit tube, and the elastic expansion layer is connected with the first elastic bellows through the fixing connector and can provide restoring force for the first elastic bellows. According to the imitation snake soft-bodied rod-climbing robot and application thereof, working is stable andreliable, the cost is low, the structure is simple, manufacturing is easy, the application value is high, the application prospect is good, and the imitation snake soft-bodied rod-climbing robot and application thereof are worthy popularizing and applying on a large scale.

The invention provides a pneumatic soft actuator which is of a spiral structure. A base body is made of a super-elastic material, an inflation air cavity is formed in the base body, input air pressure servers as driving force, and unfolding movement is achieved; the higher the air pressure is, the smaller the curvature is, and after the curvature is decreased to zero, negative curvature unfolding movement can be achieved; a strain limiting layer adheres to the outer side of the base body and is used for limiting axial stretching movement and enhancing unfolding movement; and a sealing blocking head at the tail end of the base body is used for blocking the air cavity, and air leakage is prevented. According to the pneumatic soft actuator, the spiral structure is adopted, thus, two directions of positive curvature and negative curvature for unfolding movement can be achieved along with increasing of the input air pressure, and in addition, large-scale unfolding movement can be achieved under low input air pressure. The spiral pneumatic soft actuator has the good unfolding movement performance and multiple potential application fields, such as the medical field used for developing novel recovery gloves and the like.

The invention discloses a Cu50Zr40Ti10 block amorphous alloy composite and a preparation process thereof. The Cu50Zr40Ti10 block amorphous alloy composite is formed by thermoforming spherical Cu50Zr40Ti10 amorphous alloy powder and a multi-walled carbon nanotube, wherein the weight ratio of the spherical Cu50Zr40Ti10 amorphous alloy powder to the multi-walled carbon nanotube is (5.91-5.997):(0.003-0.09). The carbon-nanotube-reinforced Cu50Zr40Ti10 block amorphous alloy composite has the density of 6.30-6.83 g / cm<3>, the heat conductivity of 2.15-3.32 Wm<-1>K<-1>, the compression strength of 236.8-1057.0 MPa and the strain limit of 2.1-10.0%.

A multi-layer bell is formed from the outer shell of a multi-layer pipe in a secondary process, thereby allowing the extrusion process to be conducted at normal speeds. The bell may include a strain limiting membrane fused or mechanically secured between the outer shell extrusion layer and the inner liner extrusion layer, increased hoop or circumferential stiffness. This invention allows the extrusion process to be in its simplest form, with no adjustments to the corrugator or extruder speeds.

The invention discloses a processing method of a steel structure fiber model, characterized in that the processing method comprises the following steps of: calculating the ratio of the length of the component to the length of the shaping corner segment n and carrying out loading solution on the formed fiber model, the failure of components in the dynamic response process of numerical simulation can meet the deformation limit and material strain limit of FEMA components, and the damage degree of remaining structural components can be evaluated according to the performance evaluation index of FEMA standards. Compared with the prior art, the present invention has the advantages of simple analysis process and high working efficiency, and in particular provides favorable basis and reference fordamage and destruction of important components.

A technique of monitoring strain on a printed circuit board assembly involves the use of a strain detector mounted on a printed circuit board. The strain detector is formed of a non-ductile material. The strain detector has a narrowed portion forming a weak link that has a characteristic of breaking when a critical strain limit is exceeded. The method of monitoring can include visual or electrical inspection. The electrical inspection can include having a strain monitoring device. The strain monitoring device has a timer connected to at least one strain detector and a memory for storing results connected to the timer. The capacitance of at least one of the strain detectors is sampled and any change in capacitance is recorded to the memory. In one embodiment, a time stamp occurs in the memory based on when an electrical property changes across at least one of the strain detectors.

Disclosed herein is a method comprising: spraying a coating onto a surface of a component, wherein the coating is at least partially amorphous, wherein the coating is configured to protect the component for underground use. Disclosed herein is a component so coated. The coating may have an elastic strain limit greater than a yield strain of the component. The coating may have a modulus of elasticity lower than a modulus of elasticity of the component. The coating may have a hardness higher than a hardness of the surface. A coefficient of friction between the coating and steel may be lower than a coefficient of friction between steel and steel.