69 results about "Pre strain" patented technology

The present invention relates to transducers, their use and fabrication. The transducers convert between mechanical and electrical energy. Some transducers of the present invention include a pre-strained polymer. The pre-strain improves the conversion between electrical and mechanical energy. The present invention also relates to devices including an electroactive polymer to convert between electrical and mechanical energy. The present invention further relates to compliant electrodes that conform to the shape of a polymer included in a transducer. The present invention provides methods for fabricating electromechanical devices including one or more electroactive polymers.

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 dual phase steel sheet with good bake-hardening properties is provided. The steel sheet is characterized in containing (in terms of percent by mass) C: no less than 0.06% and less than 0.25%; Si+Al: 0.5 to 3%; Mn: 0.5 to 3%; P: no more than 0.15%; and S: no more than 0.02%; and also meeting the following condition (in terms of space factor) that retained austenite is at least 3%, bainite is at least 30%, and ferrite is no more than 50%, and further characterized in differing in stress larger than 50 MPa before and after application of 2% pre-strain and ensuing heat treatment for paint baking at 170° C. for 20 minutes. The steel sheet has well-balanced strength and workability, exhibits good bake-hardening properties at the time of paint baking, and offers good resistance to natural aging.

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.

An extensible laminate having a first web material, a second web material, a first elastic and a second elastic having different stretch properties. The elastics are laminated between the first and second materials. The elastics have substantially the same equilibrium points within the laminate. The elastics are pre-strained at different strain rates. The elastics may have different basis weight. The elastics may have different diameters. The elastics may be constructed of different materials. The elastics may be extruded in situ. The extensible laminate may further have a first stretch region containing multiple elastics and a second stretch region also containing multiple elastics, wherein the spacing between elastics in the first region is different than the spacing in said the second region.

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.

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.

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.

An extensible laminate having a first web material, a second web material, a first elastic and a second elastic having different stretch properties. The elastics are laminated between the first and second materials. The elastics have substantially the same equilibrium points within the laminate. The elastics are pre-strained at different strain rates. The elastics may have different basis weight. The elastics may have different diameters. The elastics may be constructed of different materials. The elastics may be extruded in situ. The extensible laminate may further have a first stretch region containing multiple elastics and a second stretch region also containing multiple elastics, wherein the spacing between elastics in the first region is different than the spacing in said the second region.

A dual-mode high-waist disposable absorbent pant with foldover waist features is disclosed. The pant may include a laterally extending folding region disposed longitudinally between the waist opening edge and the front and/or rear ends of an absorbent core structure; the folding region may include a first web structure. The pant may also include a waistband region disposed longitudinally between the waist opening edge and the folding region; the waistband region may include a second web structure and one or a plurality of laterally extending, pre-strained elastic member(s) disposed between a first pair of layers. The second web structure may differ in configuration from the first web structure. The longitudinal dimension between the waist opening edge of the pant and the leg opening edges may be at least 30 percent of the overall length of the pant when in an open, fully extended and flattened condition.

A stretch laminate is disclosed. The stretch laminate may include a first layer; a second layer; and one or more elastic members disposed between the first layer and the second layer. The first layer may include a nonwoven web material bearing a pattern of thermal bonds, including a plurality of bonds each having a length and a width, the length being oriented perpendicularly to the stretch direction and being greater than the width, for a majority of the bonds. The elastic member(s) may be joined with the first layer and the second layer while pre-strained in the stretch direction; when the stretch laminate is in a relaxed condition, at least the first layer may include a plurality of gathers comprising elongate ridges and valleys oriented transversely to the stretch direction. A disposable absorbent pant having an elasticized belt structure including the stretch laminate, is also disclosed.

The invention relates to a testing and measurement method for a hardening curve of a metal bar under a large strain range, and the method comprises the following steps of firstly carrying out round bar sample torsion test to determine an uniform torsion range, carrying out pre-torsion deformation of different levels on samples in the uniform torsion range, and calculating the corresponding pre-strain; subsequently carrying out round bar sample uniaxial tension test, carrying out uniaxial tension test respectively on torsion-free and torsion samples, determining an effective hardening curve before material necking according to the tension result of the torsion-free samples, determining a true stress and strain curve under different pre-strain levels of the samples by the torsion samples, and carrying out translation along a strain axis, wherein the amount of translation is the pre-strain cumulated by the corresponding pre-torsion deformation; finally extracting the true stress and totalplastic strain data corresponding to the maximum load point in the true stress and strain curves after each translation, fitting together with the pre-necking hardening curve determined by the samplewithout pre-torsion, and finally determining a hardening curve of the metal round bar samples under the large strain range.

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.

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.