1114 results about "Elastic plastic" patented technology

A plug in connector of releasable type used for inserting into tubular plug in piece with fender consists of cylindrical plug in cavity and locking ring prepared from hard and elastic plastics. It is featured as making lock ridge to be arc form towards inside, pushing and opening edge of arc form when plug in piece is pushed in connector then clocking plug in piece in connector and engaging arc edge together behind fender, using a pair of V form elastic arm to connect tail ends of lock ridge edge to each other for using said arm to push it up to unlocked position in order to draw off plug in piece from connector.

Vehicle with a knee protection airbag having a storage position and a deployed position. The airbag includes at least one cell constructed from reinforced elastic film and an inflator for inflating the airbag from the storage position to the deployed position. The airbag is arranged to substantially fill a space between the knees and lower extremities of the occupant when seated on the front seat and the instrument panel in the deployed position such that the airbag cushions only the knees and lower extremities of the occupant. Alternatively, the airbag includes at least one cell constructed from a laminate of a first elastic film and a second inelastic film. Alternatively, the airbag is a composite airbag having at least one layer of inelastic plastic film attached to a second layer of a more elastic plastic film, the second layer serves to blunt the propagation of a tear.

The invention discloses a method for analyzing the fatigue life of a steering knuckle, comprising the following steps: 1) obtaining the fatigue load of the steering knuckle; 2) carrying out uniaxial tensile material test on the use material; 3) if the fatigue load is under the static load condition, the elastic-plastic finite element analysis method is adopted to solve the problem; or, if it is the actual pavement load spectrum, the elastic-plastic finite element analysis is carried out on the points exceeding the yield strength by elastic finite element method and linear superposition method,and the modified stress-strain results are obtained. 4) analyzing the biaxiality of the obtained stress response in time domain to determine the load state of the steering knuckle; 5) calculating thedamage accumulation and life of steering knuckle. The present invention solves the problem of time-consuming finite element solution under the input of actual pavement load spectrum, at the same time, the stress and strain of the material entering the plastic phase are considered, so that the result is more accurate, and fatigue analysis is carried out by combining the static load condition or the single channel static load condition, and more references are provided in the design phase.

In order to achieve a comfortable level of spray noise using a cap having a button and an angled spray channel, it is suggested that the spray channel be manufactured in one piece from elastic plastic, e.g., from TPE or TPU.

The invention discloses a method for establishing a rock material ageing and elastic-plastic mechanics constitutive model. The method includes the steps that the triaxial short-long term test result of rock is used as the basis first, and the volumetric strains of a rock test piece under different test conditions are calculated; by drawing a stress-axial and lateral strain relation curve and a stress-volumetric strain relation curve, the yield criterion, the non-associated flow rule and the hardening criterion of the rock are determined, and an elastic-plastic mechanics model is established; then by combining material micro and fine damage attenuation ageing evolution dynamic equilibrium, the micro and fine ageing damage rule of the rock is determined, the model is popularized, a relation matrix of strain increment and stress increment at the ageing-elasticoplastic deformation stage is established, and accordingly the rock material ageing and elastic-plastic mechanics constitutive model is obtained. According to the model, the mechanics significance is definite, the expression is unique, the number of parameters is small and can be obtained based on the test results, hence, solving uniqueness and accuracy are guaranteed, and wide applicability and expansibility are achieved.

The present invention relates to a modified water-proofing asphalt roll material (called SA roll material for short), and is characterized by that in the raw material formula of asphalt 4-15% of thermoplastic elastomer polystyrene-butadiene-styrene block copolymer (SBS), 3-12% of atactic polypropylene (APP), 1-8% of light shielding agent, 0.05-3% of antioxidant, 0.05-3% of light stabilizer and 0.05-3% of UV absorbing agent. Said water-proofing roll material possesses low-temp. resistance, high-temp. resistance. UV-resisting property and good ageing resistance.

The invention discloses a method of establishing an elastic-plastic mechanical constitutive model made of a rock material. The method comprises the following steps: measuring and recording variation values of axial and lateral strains of a rock specimen along with the stress, and calculating a volumetric strain of the rock specimen; drawing a stress-axial/lateral strain relation curve according to recorded full-course axial and lateral strain changes of the rock specimen, and respectively determining a yield failure rule and a hardening rule of the rock material of the specimen; drawing a stress-volumetric strain relation curve according to the calculated volumetric strain of the rock specimen to determine a non-relevant flow rule of the rock material of the specimen; determining the constitutive model by using a thermodynamic elastic-plastic theory in combination with the stress-strain curve, peak stress, yield initial stress and boundary strength of rock. The method disclosed by the invention comprehensively considers the yield rule, the non-relevant flow rule and the hardening rule of the rock material, favorably reflects the elastic-plastic mechanical behavior of the rock material and ensures the uniqueness and the accuracy of the constitutive model.

The invention discloses a determination method of tunnel surrounding rock prestressing force reinforcing anchor rod length and radial prestressing force values. According to the surrounding rock elastic-plastic theory and the plastic zone distribution regulation, and, on the basis that a tunnel plastic ring radius R and a surrounding rock pressure force are comprehensively determined, the minimum length value and a radial minimum prestressing force value of a tunnel surrounding rock reinforcing anchor rod are determined. The determination method advantageous in that, according to the surrounding rock elastic-plastic theory and the plastic zone distribution regulation, and, on the basis that the tunnel plastic ring radius R and the surrounding rock pressure force are comprehensively determined, the minimum length value and the radial minimum prestressing force value of the tunnel surrounding rock reinforcing anchor rod are determined, the calculation process is relative clear and concise, and a measured result is high in accuracy and accurate, has a small error compared with the actual and can guide the practice well.

The invention provides a simulation method for residual stress prediction of micro-milling nickel-based superalloy, belongs to the field of finite element simulation cutting, and relates to a finite element simulation method for residual stress prediction analysis in the cutting processing process of difficult-to-process materials of the nickel-based superalloy. According to the simulation method, the finite element simulation method is used; the elastic-plastic constitutive relationship of materials is considered; and a Johnson-Cook fracture failure criterion is used for judging the failure, so that residual stress prediction values under different cutting parameters can be obtained. A micro-milling cutter for experiments is shot into a picture through a scanning electron microscope; the picture is drawn into a micro-milling cutter solid model through software; a three-dimensional processed workpiece model is built; and the model is subjected to lattice division. The method has the advantages that the surface residual stress can be measured, and the residual stress in the depth direction can also be measured, so that the problem of measurement difficulty of the residual stress in the depth direction in the measurement process is solved. The cost is reduced, and the labor is saved. In a prediction model, the cutting parameters are variable; and the prediction on the surface residual stress of the difficult-to-process materials is effectively realized.

The invention relates to the calculation of parameters to inform hydraulic stimulation of non-conventional hydrocarbon-bearing rock formations, such as shales. Unlike conventional formations, non-conventional formations tend to display elastic-plastic behavior and have stress-strain characteristics which with substantial non-linear regions. A parameter which has been termed Elastic Index (EI) is proposed, together with a demonstration of how this parameter, when coupled with principles of fracture mechanics, may be used to extract meaningful calculated or estimated values for e.g.; total required volume of fracturing fluid; treating pressure; fracturing fluid viscosity; proppant size; and proppant concentration.

The invention discloses an uncured polyurethane waterproofing coating and a preparation method thereof, belonging to the technical field of polyurethane waterproofing coatings. The uncured polyurethane waterproofing coating is prepared from the following raw materials in percentage by weight: 13-20% of prepolymer, 30-65% of asphalt, 1.0-1.5% of latent curing agent, 3-15% of compatilizer, 2-9% of thermoplastic elastomer and 0-3% of powder stuffing, wherein prepolymer is a substance synthesized by reaction between polyether and isocyanate. The uncured polyurethane waterproofing coating mainly aims to improve the material proportion and polymerization process of polyurethane, and the problem that a hot-melted asphalt material is needed to be heated by using a machine is solved; the uncured polyurethane waterproofing coating is convenient in construction and good in flowability; the viscosity of the constructed material can be automatically enhanced, so that the constructed material can become an elastic plastic body and a favorable waterproofing layer without internal stresses; in addition, the uncured polyurethane waterproofing coating can be well bonded with a coiled material and can be compounded to be waterproof so as to form a waterproofing layer capable of overcoming tension fracture caused by basement layer cracking and preventing puncturing; the uncured polyurethane waterproofing coating is simple and convenient in process, rapid in construction, free of maintenance, high in working efficiency and capable of becoming the development direction of building waterproofing in the further.

A multi-functional yoga brick comprises a multi-sectional holding portion at a middle section thereof. The holding portion has a shape of “8”, or a round shape or an elliptical shape. The holding portion has a through hole or no through hole. The holding portion has a plurality of layers. The multi-functional yoga brick is an elastic body. The multi-functional yoga brick is made of elastic plastics or rubber or injected plastic material. The user has a better balance in exercise and can support effectively so as to expand the body.

A cover layer (1) for a panel (3) which has a panel base body (2), such as a floor covering panel, wall panel or ceiling sheathing panel and/or furniture component panel, building panel, covering panel or dry finish panel and/or as a facade element, panel element or board element, trimming plate or the like, the cover layer (1) having a paper layer (4) and a film layer (6) of elastic plastic which forms the outside (5) of the cover layer (1). The paper layer (4) is made as a preimpregnate which has already been partially impregnated during paper manufacture or as paper, especially decorative paper, which has been partially impregnated after paper manufacture and before joining to the paper layer (4).

The invention discloses a seamless bridge deck expansion joint structure for road engineering and a construction process of the seamless bridge deck expansion joint structure. The seamless bridge deck expansion joint structure for the road engineering comprises a bridge body and an expansion join, wherein concrete paving layers are arranged on the bridge body; a preserved notch is formed between two adjacent concrete paving layers; a clearance is reserved between two adjacent bridge bodies or between the bridge body and a bridge abutment; the seamless bridge deck expansion joint structure further comprises an elastic-plastic body and a backing plate; the backing plate is positioned on the bottom surface of the preserved notch for closing the clearance; the backing plate is arranged below the elastic-plastic body; the elastic-plastic body is positioned in the preserved notch for forming an elastic-plastic body expansion joint; and asphalt concrete layers are paved on the concrete paving layers and the elastic-plastic body expansion joint in a penetrating way. According to the seamless bridge deck expansion joint structure disclosed by the invention, a real seamless bridge deck can be formed; and the seamless bridge deck expansion joint structure has the advantages of higher structural safety, greater convenience in construction and convenience in replacement.

The invention discloses a weld seam fatigue life calculation method based on total strain energy density. The method mainly comprises the steps that 1, the weld-seam total strain energy density, a life function equation and a fatigue strength coefficient, a fatigue strength index, a cyclic strengthening coefficient and a cyclic strain hardening index which are needed by half-cycle life stress and a strain function equation are acquired through a welded joint fatigue test; 2, the weld seam structure is simulated through a shell unit module, the stress-strain response of the weld seam structure under the cyclic load action is calculated through a multi-load step method, and a stress-strain hysteretic curve is output; 3, the total strain energy density is calculated according to the stress-strain response, and the hot point fatigue life and a damage value of a weld toe of the weld seam are calculated by combining the energy density with the life function equation. According to the method, contribution of elastic-plastic stress and strain to the fatigue damage is comprehensively taken into account, scalar quantities are taken as damage parameters, the position and direction problems related to vectors are effectively avoided, the calculation precision is improved, and the time is saved.

A computer simulation analysis method suitable for describing the mechanical behavior of multiphase composites based on the real microstructure of materials relates to a multidisciplinary field such as computational material science, simulation and high throughput calculation. Through the first-principles calculation under nano scale, the molecular dynamics simulation under micro scale, and the thermodynamic calculation under mesoscopic scale, various physical parameters needed for the finite element simulation under macro scale can be obtained, including the elastic and plastic physical parameters of each phase in the composite at different temperature and different grain sizes. Focused ion beam experiment and image processing are adopted to obtain real material microstructure. Through the parameter coupling and parameter transfer among the calculated results of various scales, combining the microstructure of the material, stress-strain relationship, stress distribution and its evolution law, plastic deformation and other mechanical behaviors of the multiphase composites under complex stress and different temperature can be simulated.

The invention discloses a method for constructing an elastoplasticity-damage coupling mechanical constitutive model of a rock material. The method comprises the following steps of obtaining the rock material on an engineering site, and manufacturing a standard cylinder sample; carrying out conventional triaxial compression mechanical tests under different confining pressures; obtaining a rock yield criterion, a plastic hardening criterion and a non-associated fluidity rule in combination with a test result; calculating a rock damage variable according to the stress-strain curve, and obtaininga rock damage evolution equation according to a damage variable-axial strain evolution rule; deriving a constitutive equation based on an elastic-plastic mechanics theory and an irreversible thermodynamic damage constitutive theory; combining the test data to obtain model parameters; writing the mechanical model into a UMAT subprogram, embedding the UMAT subprogram into ABAQUS finite element software, and carrying out triaxial test numerical simulation, so as to verify and improve the model. The method is clear in mechanical significance, simple in parameter acquisition, wide in application range and relatively high in accuracy.

The invention discloses a flexible transparent thin-film electrode and a manufacturing method thereof. The structure of the electrode is characterized in that a poly (3,4-ethylenedioxythiophene) : poly (styrene sulfonate) (PEDOT:PSSY) stretchable substrate is employed. The substrate is made from a high-elasticity stretchable plastic material like a PVA material, a PDMS material, a PUA material, or a hydrogel. In addition, the manufacturing method comprises: a PEDOT:PSSY solution is deposited on an elastic plastic substrate by means of spinning, spraying, silk-screen printing or ink-jet printing. Therefore, the manufactured transparent electrode has excellent integrated performances including high transparency, high electrical conductivity, excellent electrochemical performance, high flexibility like random bending or warping, surface smoothness, and high chemical stability and the like.

The invention discloses a high-strength zinc alloy that can be drawn into thin wires at high speed, which contains 0.1%-5% copper, 0.01%-0.8% titanium or/and 0.05%-2% nickel by weight. The balance is zinc and other unavoidable impurities, and the content of impurities in the whole alloy is not more than 0.05% by weight. The product of the present invention has high strength, which can reach or even exceed the index of T2 and T3 soft (M) pure copper wires; it has good cold plastic processing performance, such as drawing wires with thinner wire diameters by high-speed drawing process , the thinnest wire diameter can reach φ0.1mm, the processing technology is simple, and it can realize industrial continuous production; it has a high working temperature; it has good corrosion resistance, small intergranular corrosion tendency, and high dimensional stability. Therefore, the present invention can replace the fine-diameter copper alloy wires used in domestic metal elastic plastic tiles, braided wires for coaxial cable shielding, and spring wires.