80 results about "Pre straining" patented technology

The present invention relates to electroactive polymers that are pre-strained to improve conversion from electrical to mechanical energy. When a voltage is applied to electrodes contacting a pre-strained polymer, the polymer deflects. This deflection may be used to do mechanical work. The pre-strain improves the mechanical response of an electroactive polymer. The present invention also relates to actuators including an electroactive polymer and mechanical coupling to convert deflection of the polymer into mechanical work. The present invention further relates to compliant electrodes that conform to the shape of a polymer. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.

A disposable absorbent pant having a front belt portion and a rear belt portion is disclosed. The front and rear belt portions are joined at side seams and the rear belt portion has a greater length than the front belt portion. A lower edge of the rear belt portion forms at least in part edges of left and right leg openings to the rear of the side seams. The rear belt portion includes first and second layers of nonwoven web material sandwiching a plurality of laterally extending and laterally pre-strained elastic strands, disposed below the side seams. A first of the plurality of elastic strands differs from a second of the plurality of elastic strands by one or more of amount of pre-strain, tensile modulus, decitex, and combinations thereof.

A composite structure (3) includes a piezoelectric element (1) sandwiched between fiber composite panels (2). The composite structure can be used as an actuator element. In a method for producing the composite structure, the fiber composite panels are pre-stressed and pre-strained by applying respective pre-stressing forces (F1, F2) in opposite directions along two substantially perpendicular axes in the plane of the panel. The pre-stressed and pre-strained condition of the fiber composite panels (2) is maintained, while the panels are adhesively bonded (5) surfacially onto the piezoelectric element (1). After the bonding is completed, the pre-stressing forces are removed from the fiber composite panels. As a result, in the finished composite structure (3), the fiber composite panels (2) are under internal tension, while the piezoelectric element (1) is under internal compression. The pre-stressing forces (F1, F2) are particularly selected in magnitude and direction to achieve the required resultant balance of tension and compression within the composite structure (3). The pre-compression of the piezoelectric element (1) should be sufficient so that operating loads on the composite structure do not result in tension loading of the piezoceramic element, while substantially maintaining the useful active strain range of the overall composite structure.

The invention belongs to the technical field of flexible device manufacturing, and relates to a method for manufacturing a flexible stretchable device based on an ordered arrangement torsion structure. The method includes the steps that firstly, a flexible macromolecule substrate is pre-stretched to be fixed to a glass sheet, and electrodes are manufactured at the four edges of the pre-stretched flexible macromolecule substrate; secondly, the flexible macromolecule substrate is placed on an annular metal collector connected with the negative electrode of a power source to serve as a collecting substrate, and a machined hollow stainless steel needle serves as a spinning spraying head; a spinning solution is injected into a spinning solution container for electrospinning; the flexible macromolecule substrate is horizontally rotated by 90 degrees for continuous electrospinning and then taken down from the glass sheet, and the flexible stretchable device based on an ordered arrangement torsion structure is obtained. The method is simple in manufacturing process and convenient to operate; the manufactured flexible stretchable device can be stressed and tensioned in one or two of the two-dimensional directions respectively, pre-strain control over materials in the two directions can be accurately achieved, and the application range is wide.

The invention relates to a compound type memory alloy friction damper, which is mainly composed of a main board, a sub board, a friction plate, a hyperelastic shaped memory alloy wire, a resetting pulling rod, a U-shaped pre-strained adjusting plate and a high strength bolt. The invention is characterized in that the friction plate is inserted between the main board and the sub board, a bolt movable hole and a pulling rod movable hole are reserved on the main board, and a bolt hole and the pulling rod movable hole are reserved on the sub board and the friction plate; the high strength bolt penetrates through the bolt hole on the sub board and the friction plate and the bolt movable hole on the main board; the resetting pulling rod penetrates through the pulling rod movable hole on the main board, the sub board and the friction plate; the hyperelastic shaped memory alloy wire penetrates through the resetting pulling rod and the U shaped pre-strained adjusting plate, and the both ends are respectively pulled tightly and fixed with a clamping device, the interval between the U shaped pre-strained adjusting plate and the resetting pulling rod is adjusted through an adjusting bolt, to ensure the hyperelastic shaped memory alloy wire to reach the required initial strain. The invention has the advantages that the capacity of the energy dissipation is strong, the resetting is automatic, the structure type is simple, and the invention is convenient for the application of the engineering.

A stretch laminate is disclosed. The stretch laminate may include a layer of nonwoven material that includes an accumulation of filaments and has an inner surface and an outer surface, the outer surface having an ordered arrangement of zones, each zone having an attenuated region adjacent to a build-up region wherein the attenuated region has a first basis weight and the build-up region has a second basis weight greater than the first basis weight, the difference in basis weights corresponding to disposition of the filaments according to the ordered arrangement. The stretch laminate may include a plurality of elastic strands space apart from each other in a crotch-stretch direction. In some examples the elastic strands may have an Average Strand Spacing no greater than 3 mm and / or an Average Decitex no greater than 300, and / or an Average Pre-Strain no greater than 250 percent.

A method of hydraulically prestraining the tubes of a once-through steam generator by welding the tubes to their respective tubesheets prior to the application of hydraulic expansion to produce tensile stresses which shorten the tubes an equal and predetermined amount to increase the margin to buckling and increase the natural frequency of the tubes reducing flow induced vibration.

Automatic-resetting super elasticity shape memory alloy damper is a damping control device used in the areas of civil construction and mechanical engineering technique .It is characteristiced by its framework that consisted of a working piston , a fixing piston , a cylinder ,a cover and a joint rod .The machine uses its alloy wire to restrict the left and right pistons to the partition-wall of the cylinderand the spacing nut. when the pull bar works, piston in one side works follow it ,the piston in the other side is resisted by the partition-wall of the cylinder and keep the resetting alloy wire on running and produce a great anamorphosis restoration ability.The pre-strain resetting super elasticity shape memory alloy wires are divided into tow groups, one of which is used to connect the right fixing piston to the left coverand, the other is used to bind the left fixing piston to the right cover.the two groups doing a interchange push and pull in the pull bars in order to create a bigger energy consumption. The invention simultaneously has the functions of good energy consumption and resetting.It can reduce the vibration of fabrics, components or the remained deformation and has simple structure.

Devices, kits and methods described herein may include a dressing that is pre-strained and stored for a period of time after which the dressing is applied to the skin of a subject.

The invention discloses a titanium alloy thin-wall part hot-stretch creep deformation composite molding method. The titanium alloy thin-wall part hot-stretch creep deformation composite molding method comprises eight steps that 1, equipment and raw materials are prepared; 2, electrode splints are electrified and a blank material needing to be molded is heated; 3, real-time measure of a temperature of the blank material needing to be molded is carried out and output voltage of a power supply is adjusted in real time to realize a blank material heating rate of 5 to 25 DEG C per second; 4, when a temperature of the blank material needing to be molded is in a range of 600 to 750 DEG C, jaws of a stretch molding device clamp the blank material needing to be molded and the blank material needing to be molded is subjected to pre-stretch at a preset strain rate; 5, when a pre-strain ratio is in a range of 0.1 to 4%, the molded blank material is subjected to coating at a temperature of 600 to 750 DEG C and a preset strain rate until the molded blank material is completely fitted to a mold; 6, the molded blank material treated by the step 5 is subjected to stretch supplement at a temperature of 600 to 750 DEG C and a preset strain rate until an end strain ratio is in a range of 0.1 to 8%; 7, the molded blank material treated by the step 6 is subjected to heat preservation for a period of time so that stress relaxation in the molded blank material occurs and creep deformation molding is realized; and 8, the powder supply is cut off and the molded blank material treated by the step 7 is cooled and is taken down.

Articles made of shape memory alloys having improved fatigue performance and to methods of treating articles formed from shape memory alloy materials by pre-straining the articles (or desired portions of the articles) in a controlled manner so that the resultant articles exhibit improved fatigue performance. The shape memory articles are preferably medical devices, more preferably implantable medical devices. They are most preferably devices of nitinol shape memory alloy, most particularly that is superelastic at normal body temperature. The pre-straining method of the present invention as performed on such articles includes the controlled introduction of non-recoverable tensile strains greater than about 0.20% at the surface of a desired portion of a shape memory alloy article. Controlled pre-straining operations are performed on the shape-set nitinol metal to achieve nonrecoverable tensile strain greater than about 0.20% at or near the surface of selected regions in the nitinol metal article. The pre-straining operations result in a significant increase in fatigue life of the selectively treated regions and an overall improvement in the fatigue performance of the device.

The invention provides a pre-deformation method capable of endowing a cement pavement calking material with a shape memory function, belongs to the technical field of cement pavement calking material preparation, and solves the problems of one-way shape memory function endowing , poor self-healing effect, complex temperature control requirement, high cost, limited preparation amount, poor durability and the like in the current pre-deformation method for the cement pavement calking material. The pre-deformation method comprises the following steps: stretching and deforming a calking material vertically to a design strain value at the temperature which is higher than a calking material glass transition temperature, and freezing a pre-stretching strain; applying compressive stress at a constant speed to a test piece in a vertical stretching direction at a normal temperature to enable the test piece to reach a preset compressive strain level, fixing the pre-compressive strain value, and endowing the calking material with the shape memory function in a two-dimensional direction; measuring the shape memory effect and other pavement performance of the calking material, and preferably selecting a group of reasonable stretching and compressive pre-strain value combination. According to the method provided by the invention, the difficulty in two-dimensional pre-deformation is reduced, so that the calking material has a better shape memory effect, and the durability of the calking material and a cement pavement are improved.

Energy-consumption-resetting shape memory alloy damper is a damping control device used in the areas of civil construction and mechanical engineering technique. Its outer steel plate ,along with the coupling bar ,is sticked into the guide bar and constitutes a rigid fixing structure .The inside steel plate is sticked into the pull-bar of the section , spacing by a sleeve, constituting as a slide frame. The machine works by adjusting screw and nut to exert pre-strain to the centre point of the super elasticity surface plate, with one pair of wires connect the left outer steel plate to the right inside steel plate ,the other pair connect the right outer steel plate to the left inside steel plate. When the sliding frame mount runs,wires in one side are elongated while wires in the other side being buckled,a bigger anamorphosis restoration ability being created. At the same time, two pairs of wires pull and push interchange, which provides a bigger energy consumption and steady damp force. This invention simultaneously has the functions of good energy consumption and resetting.It can reduce the vibration of fabrics and components or the remained deformation.and also has simple structure and easily installed.

The invention provides a flexible lead, a preparation method of a flexible electronic device and a flexible wireless energy supply device. The method comprises steps that a base material formed through combining a rigid substrate, a sacrificial layer and a functional film is provided; a femtosecond laser is utilized to cut the functional film of the base material such that the functional film is formed with a planar wire structure; the sacrificial layer is removed, and the planar wire structure is separated from the rigid substrate; a two-dimensional flexible wire is formed on the planar wirestructure; or the planar wire structure is assembled to a pre-stretched flexible substrate, pre-strain of the flexible substrate is released, and the planar wire structure is bent to form a three-dimensional flexible wire . The method is advantaged in that the flexible wire with high precision, large scale and no pattern limitation can be prepared, unique advantages of fast property, environmentalprotection, low cost, high resource utilization rate and insensitivity to the external environment can be further realized, and the method is suitable for preparing 2D and 3D flexible wires.

This invention provides an accurate quick leveling device including a leveling platform, an installing base, multiple sets of parallel reeds between the leveling platform and the base, on-line position measurement sensor components, eccentric / cam components, pre-strain springs and an executing wheel component, all of which are set on the base corresponding to each other in a same included angle.

Allows the reduction in the loss of precision of a discharge caused by the progressive heating-up of the barrel during a long succession of discharges, comprising at least: an interior rifled gunbore (1), an outer sleeve (2) mounted coaxially on the rifled gunbore (1) and configured with a high polar moment of inertia to support the strains in the rifled gunbore (1), while at the same time providing rigidity to the conjoined configuration, and a screwed union (3) adapted for the solid mutual fixation of said pieces. At least two holes (5, 6) are additionally provided which traverse the wall of the rifled gunbore (1) equilibrating the temperatures of said rifled gunbore (1) and said outer sleeve (2), in such a manner as to maintain the initially provided pre-strain of the barrel. The outer sleeve (2) may dispose an aperture for gases (1), adapted for the fitting of a repeat mechanism.

A composite test coupon includes a plurality of plies. The plurality of plies include first ply layers and second ply layers. The first ply layers have first fibers and a substantially uniform matrix material associated with the first fibers. The second ply layers have second fibers and a pre-stressed matrix material associated with the second fibers. The first fibers are oriented in a first direction, and the second fibers are oriented in a second direction that is different from the first direction. The pre-stressed matrix material includes stress induced cracks between the second fibers of each of the second ply layers.

A seal assembly and method of forming a seal assembly provides a seal body having reduced strain during use, thereby increasing service life. The seal body may be formed within certain parameters, such as ranges of height-to-thickness and offset-to-height ratios, which have been found to reduce strain. Additionally or alternatively, the seal body may be modified from an initial configuration to a pre-strained configuration by axially displacing an inner section of the seal with respect to an outer section of the seal, which also reduces strain.

A system and method of constructing a 4D-printed ceramic object includes extruding inks including particles and polymeric ceramic precursors through a nozzle to deposit the inks on a heating plate, whereby a 3D-printed elastomeric object is formed on the heating plate, folding the 3D-printed elastomeric object into a complex structure to form a 4D-printed pre-strained elastomeric object, and converting the 4D-printed elastomeric object into the 4D-printed ceramic object.

The invention provides a thermo-mechanical processing method for eutectic high-entropy alloy. The method comprises the following steps that S1, rolling and recrystallization treatment is carried out multiple times; and S2, pre-strain and aging treatment is carried out; namely, the eutectic alloy is subjected to the rolling and recrystallization treatment many times, and then is subjected to the pre-strain and aging treatment to obtain the eutectic alloy subjected to thermo-mechanical processing. According to the method, mechanical treatment and multiple heat treatment processes are applied tothe eutectic alloy, interface strengthening, dislocations strengthening and precipitation strengthening are used in combination to obtain the ultrahigh-strength eutectic alloy, and the method has a wide industrial application prospect.

The invention discloses a medical expense big data analysis method, device and equipment and a computer readable storage medium. The method comprises the steps that a data request inputted from the outside is received, and the medical expense data corresponding to the data request are called from a database, wherein the database is obtained by integration of multiple distributed heterogeneous medical expense data sources; data mining is performed on the medical expense data corresponding to the data request by using the pre-strained data mining algorithm so as to obtain the data mining resultcorresponding to the data request; and the data mining result is outputted. According to the technical scheme, multiple distributed heterogeneous data sources are integrated in the unified database sothat unified analysis and management of the data can be facilitated; and the data useful for the user can be effectively acquired from the massive medical expense data and thus the method has great advantages in medical expense big data processing.

A III-nitride semiconductor light emitting device incorporating n-type III-nitride cladding layers, indium containing III-nitride light emitting region, and p-type III-nitride cladding layers. The light emitting region is sandwiched between n- and p-type III-nitride cladding layers and includes multiple sets of multi-quantum-wells (MQWs). The first MQW set formed on the n-type cladding layer comprises relatively lower indium concentration. The second MQW set comprising relatively moderate indium concentration. The third MQW set adjacent to the p-type cladding layer incorporating relatively highest indium concentration of the three MQW sets and is capable of emitting amber-to-red light. The first two MQW sets are utilized as pre-strain layers. Between the MQW sets, intermediate strain compensation layers (ISCLs) are added. The combination of the first two MQW sets and ISCLs prevent phase separation and enhance indium uptake in the third MQW set. The third MQW set, as a result, retains sufficiently high indium concentration to emit amber-to-red light of high output power without any phase separation associated problems.

A III-nitride semiconductor light emitting device incorporating n-type III-nitride cladding layers, indium containing III-nitride light emitting region, and p-type III-nitride cladding layers. The light emitting region is sandwiched between n- and p-type III-nitride cladding layers and includes multiple sets of multi-quantum-wells (MQWs). The first MQW set formed on the n-type cladding layer comprises relatively lower indium concentration. The second MQW set comprising relatively moderate indium concentration. The third MQW set adjacent to the p-type cladding layer incorporating relatively highest indium concentration of the three MQW sets and is capable of emitting amber-to-red light. The first two MQW sets are utilized as pre-strain layers. Between the MQW sets, intermediate strain compensation layers (ISCLs) are added. The combination of the first two MQW sets and ISCLs prevent phase separation and enhance indium uptake in the third MQW set. The third MQW set, as a result, retains sufficiently high indium concentration to emit amber-to-red light of high output power without any phase separation associated problems.

The invention provides a reinforced earth body sticky, elastic and plastic deformation measuring method, a construction method and a tensioning system. A computational formula for pre-strain reinforced earth body sticky, elastic and plastic deformation epsilon is shown in the specification. By the adoption of the sticky, elastic and plastic deformation measuring method, the pre-strain reinforced material total deformation generated after construction is more comprehensively, accurately and reliably estimated, and it is guaranteed that the initial deformation of a reinforced material is proper when the reinforced material is tensioned, so that the situation that the additional deformation of the reinforced material is too large due to the settlement deformation of an embankment is avoided, and the phenomenon that the allowing strain of the reinforced material is exceeded and consequently the reinforced material is broken and fails is prevented. By the adoption of the construction method, occurrence of geological disasters in the environments such as high and steep slope large slippage can be scientifically prevented and reduced.

The invention provides a single-stage double-shaft pre-deformation method for endowing a pavement joint material with a shape memory function, belongs to the technical field of cement pavement, and solves the problem that existing single-stage single-shaft pre-deformation method can only endow the material with the shape memory function in one direction, and thus the material is poor in self-healing effect. A cruciform specimen of a shape memory polymer matrix composite is produced at first, pre-compaction deformation is performed along the vertical direction at the temperature higher than a glass-transition temperature, meanwhile prestretching deformation is performed along the horizontal direction, and thus the joint material is endowed with the shape memory function in both horizontal and vertical directions; then the shape memory effect of the joint material after pre-deformation is measured and further synthesized with other operational performance of the joint material to determine reasonable stretching and compression pre-strain values for endowing the joint material with the shape memory function. According to the pre-deformation method provided by the invention, the joint material actively adapt to cyclic change of the width of the cement pavement joint, usability and durability of the joint material are improved, and service life of the cement pavement is prolonged.

A replaceable energy dissipation wood structure beam-column joint comprises a beam column connecting piece, a steel plate frame, a plurality of embedded steel bars and a plurality of shape memory alloy screws. The beam column connecting piece is arranged on the inner side face of a wood column and located between the wood column and the connecting end of a wood beam. The steel plate frame is arranged at the end of the wood beam and attached to the upper face, the lower face, the front face and the rear face of the end face of the wood beam; the embedded steel bars are respectively embedded inhole channels or groove channels in the end surface of the wood beam through adhesive; and the shape memory alloy screws are positioned between the embedded steel bars and the beam column connecting piece. According to the invention, the pre-tightening force of high-strength bolts are adjusted, the hyperelastic performance of the shape memory alloy screws is utilized, the pre-strain, number and size of the shape memory alloy screws are adjusted, the initial rigidity and self-recovery capacity of joints are improved, it is guaranteed that the shape memory alloy screws are subjected to yield damage before beam column components, so that the maintenance and repair costs of the wood structure are greatly reduced.

The invention discloses a pre-strain rib total deformation measuring method in a pre-strain reinforcement test. A calculation formula of the pre-strain rib total deformation epsilon i is Epsilon i=Delta Epsilon'i+Delta Epsilon ci+Delta Epsilon'ri, wherein the Delta Epsilon'i is initial pre-strain of a pre-strain rib, the Delta Epsilon ci is additional strain of the pre-strain rib due to soil body compression, and the Delta Epsilon'ri is rib creep rate. The actual engineering conditions are considered in the formula, the pre-strain rib total deformation can be accurately and reliably estimated, initial deformation degree of the rib during rib tensioning is ensured, overlarge additional rib deformation caused by settlement deformation of an embankment is avoided, accordingly fracture failure caused by the fact that the total rib deformation exceeds allowable strain is prevented effectively, and environmental geological disasters including high and steep slope slippage and the like can be scientifically prevented and decreased.