Bonding strength checking method for vehicle adhesive
A technology of bonding strength and adhesive, applied in the direction of using mechanical devices, instruments, measuring devices, etc., can solve the problems of no strength evaluation model, insufficient understanding of the mechanical properties of bonded joints, and imperfect basic experimental research.
Inactive Publication Date: 2015-04-15
JILIN UNIV
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Problems solved by technology
However, there are problems such as complex operation process, not widely used and defects in detection.
[0005] Although the bonding technology has many advantages, judging from the current research status, there are still the following problems in the research on bonding technology: (1) The mechanical properties of bonded joints are not fully understood, the relevant basic experimental research is not perfect, and the accumulation is relatively large. Few, there is no uniform and complete strength design standard
(2) For the strength prediction and design methods of typical joints and important bonding parts of the car body, there is still a lack of effective research methods in engineering
(3) There is no effective strength evaluation model in the CAE numerical simulation analysis of the bonding structure, especially the bonding performance evaluation under complex stress states and different environments, which requires systematic exploration
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[0025] The present invention is described in further detail below in conjunction with the embodiment given with accompanying drawing.
[0026] Such as figure 1 As shown, the ratio of the normal normal stress σ to the shear stress τ in the plane when the adhesive layer is fractured is the tension-shear ratio R στ . Make n groups of bonding angles respectively α n The bonded specimens were subjected to tensile fracture tests. Taking group i as an example, the bonding angle is α i , the normal normal stress at the time of fracture failure is σ i , the shear stress in the plane is τ i ,but:
[0027] (R στ ) i =tanα i = σ i / τ i 1≤i≤n
[0028] For the convenience of subsequent calculations, the present invention defines:
[0029] 0=α 1 2 n-1 n =π / 2 n≥2 and n is an integer
[0030] For exemplary illustration, seven groups of adhesive tensile test specimens with bonding angles of 0°, 15°, 30°, 45°, 60°, 75°, and 90° are established, as figure 2 As shown, the number...
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The invention discloses a bonding strength checking method for a vehicle adhesive. The method comprises the following steps: calculating the complete stress of an adhesive layer unit on a bonding plane according to a formula shown in the specification, calculating the limit stress of the adhesive layer unit according to a formula shown in the specification, and calculating according to the formula that 1-R=1-p' / p'' to judge the safety. The method can be used for checking bonding strength of a vehicle bonding structure under any complex working conditions. When the working conditions of the bonding structure are determined, the safety of the bonding structure can be judged according to the checking method disclosed by the invention, and moreover, the bonding structure can reach a safe and reliable state in the ways of adjusting the bonding structure form, the bonding area, the gluing amount and the like.
Description
technical field [0001] The invention relates to the field of checking the bonding strength of adhesives, and more specifically, relates to a method for checking the bonding strength of vehicle adhesives applied in the fields of high-speed EMUs, railway passenger cars, road passenger cars and the like. Background technique [0002] Adhesive technology is a commonly used material connection technology in engineering. Using adhesive technology for connection and assembly has the advantages of neat appearance, relatively uniform load distribution in the connection area (compared with bolts and riveting), wide range of applicable materials and connection of dissimilar materials. and many other advantages. [0003] In recent years, with the increasing application of new materials in the industry, the application of bonding technology has become more and more extensive. In the vehicle industry, most of the body structure and interior materials, sound insulation materials, heat ins...
Claims
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IPC IPC(8): G01N19/04
Inventor 那景新刘玉王元伍董双良孙玉英李唯王若钦赵辉王艳潘乐
Owner JILIN UNIV