8 results about "Bond failure" patented technology

The invention discloses an electromagnetic wire self-adhesion performance data acquisition and intelligent analysis method, and relates to the technical field of data analysis. Multi-source data such as turn-to-turn gap, paint layer residual thickness, tension fluctuation and conduction state are synchronously acquired in the winding process; and analysis mechanisms such as a gap reduction rate, paint layer thinning distribution, a synchronous evolution track and a gap strength response curve are introduced, so that continuous modeling and quantitative characterization of the autohension performance evolution process are realized. Compared with the prior art which only depends on a single gap threshold value or a post mechanical test to judge the bonding performance, the method can be started from a complete physical chain from gap change to paint layer extrusion to metal contact to bonding failure, and the change trend of the bonding performance under different gap levels can be accurately revealed; and tension output is corrected in real time through a self-adaptive algorithm, closed-loop optimization of the bonding quality is achieved, and the product percent of pass and the production efficiency are improved.

A wire bond pull test apparatus for detecting a bond failure or wire breakage during a vertical tensile strength testing of a bonded wire under test. The test apparatus has a clamp structure with clamping elements and a controllable actuator coupled to at least one the clamping elements and configured to drive the movement of the clamping elements relative to each other to clamp the wire under test.

The invention belongs to the technical field of acoustical boards, and particularly relates to a bio-based adhesive, a polyurethane acoustical board and a preparation method and application of the polyurethane acoustical board. The bio-based adhesive and the light polyurethane hollow particles are combined for the first time, the dual problems of performance dispersion and bonding failure of a traditional material are solved, and synergistic improvement of weather resistance, compression resistance, water permeability, high-temperature and low-temperature hot and cold circulation, corrosion resistance, floating characteristics and sound absorption performance is achieved.

The utility model discloses an anti-falling adhesive structure which comprises a first base material, at least one groove structure is arranged on the adhesive surface of the first base material, the cross section of the groove structure is trapezoid, square or dovetail-shaped, the groove depth is 0.1-1.5 mm, and the groove width is 0.2-2mm; the groove structure is filled with the adhesive layer, and the adhesive layer is connected with the other adhered second base material; after the adhesive layer is cured, a mechanical inverted buckle matched with the groove structure in shape is formed, and the embedding depth of the mechanical inverted buckle is larger than 50% of the depth of the groove structure. According to the utility model, the anti-falling performance is obviously improved; a mechanical back-off structure and chemical bonding have a synergistic effect, so that an adhesive interface is not easy to layer when bearing tensile force or shear force; the groove structure is flexible in design, and the shape and the density can be adjusted according to different base materials and stress requirements; the process is simple, only the groove structure needs to be pre-machined on the surface of the base material, and complex equipment or additional materials are not needed; the durability is enhanced; and a mechanical interlocking structure can slow down the aging of the adhesive layer or the bonding failure caused by environmental factors.

The present application relates to the technical field of adhesive, and discloses a hot melt pressure sensitive adhesive and a preparation method and application thereof.The hot melt pressure sensitive adhesive comprises the following components in percentage by mass: base adhesive 80wt%-95wt%, lipoic acid 3wt%-15wt%, and polyvinylpyrrolidone 1wt%-7wt%.The present application successfully overcomes the technical problem of bonding failure of traditional hot melt pressure sensitive adhesive in underwater environment by introducing a complex formed by lipoic acid and polyvinylpyrrolidone, the complex can effectively absorb the water film on the surface of the base material, significantly enhance the wetting ability of the adhesive to the wet interface, and greatly improve the cohesive strength and interfacial bonding force of the colloid through the synergistic effect with the SIS base adhesive.The 180° peeling strength of the hot melt pressure sensitive adhesive after 24h of underwater immersion can reach 53.58N / inch at the highest, which is much better than the existing solvent type, reaction type and supramolecular underwater adhesives, and there is no shedding phenomenon, and the shear strength (≥70N) in the simulated seawater environment can still remain excellent, showing good environmental tolerance.

The application discloses a room-temperature curing sealant for bonding an engine sealing material and a PU pipe and a preparation method thereof. The sealant comprises a polyurethane prepolymer matrix, an amine curing agent and a curing catalyst. The application solves the problem of sealing and bonding failure between the sealing material and the PU pipe due to low bonding strength and low elongation of the sealant.

The method for establishing the bond-slip constitutive relation of reinforced concrete based on MFCC belongs to the technical field of analysis method of bond behavior of reinforced concrete. The method for establishing the method, first, obtains the parameters of reinforced concrete and the acoustic emission characteristic parameters in the bond failure process of reinforced concrete; then, respectively draws the time point-acoustic emission characteristic parameter curve and the time point-MFCC characteristic parameter curve, and takes the time point corresponding to the maximum downward fluctuation degree of the MFCC characteristic parameters in the time range as the first bond failure stage division time point of the reinforced concrete; finally, divides the bond-slip curve of the parameters of the reinforced concrete based on the first bond failure stage division time point, and establishes the bond-slip constitutive model of the parameters of the reinforced concrete based on the obtained bond-slip curve containing the effective real damage stage. The method for establishing can adapt to the influence of material parameters, express the real process of damage, and the process of establishing the model has strong generalization ability.

The invention discloses a reinforced concrete bonding-slippage constitutive relation establishing method based on MFCC, and belongs to the technical field of reinforcing steel bar and concrete bonding behavior analysis methods. The establishment method comprises the following steps: firstly, acquiring reinforced concrete parameters and acoustic emission characteristic parameters in a reinforced concrete bonding failure process; then respectively drawing a time point-acoustic emission characteristic parameter curve and a time point-MFCC characteristic parameter curve, and taking the time point corresponding to the maximum downward fluctuation degree of the MFCC characteristic parameter in the time range as the first bonding failure stage division time point of the reinforced concrete; and finally, dividing a bonding-slip curve of the reinforced concrete parameters based on the division time points of the bonding failure stages, and establishing a bonding-slip constitutive model of the reinforced concrete parameters based on the obtained bonding-slip curve containing the effective real damage stages. The establishment method can adapt to the influence of material parameters and express the real process of damage, and the process of establishing the model has high generalization force.