Finite element contrast modeling method for textured connecting piece
A modeling method and connector technology, which can be used in design optimization/simulation, special data processing applications, instruments, etc., and can solve problems such as the lack of a definite standard for embedding depth.
Pending Publication Date: 2021-04-27
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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Problems solved by technology
[0003] Existing technologies and patents only introduce the texturing technology and texturing process, but there is no detailed description and a measuring criterion for the design of composite materials in the texturing process, such as material selection, ply ratio, strength requirements, etc. At the same time, there is no definite standard for the design of metal burrs, such as burr density, burr arrangement, burr shape, embedding depth, etc.
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[0027] The present invention describes finite element models of three different joints.
[0028] Since there is a contact problem between the metal material and the composite material in the joint, for this contact problem, the first-order elements are usually used for modeling instead of the higher-order elements, because the first-order elements have superior stress distribution.
[0029] During modeling, 8-node elements (C3D8I) were used. The C3D8I element has an accuracy similar to that of the quadratic element, and is most suitable for simulating bending problems. However, during the stretching process of textured joints, bending problems often occur due to asymmetric loading.
[0030] In the joint tests, burrs and composite interface failure (delamination) and composite failure were the main failure mechanisms observed, so the model included both failure mechanisms. Fractures to burrs have not been simulated in the model.
[0031] Reference joint finite element model (...
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The invention belongs to the field of modeling, and relates to a finite element contrast modeling method for a textured connecting piece. The method comprises the following steps: establishing a model of a textured metal part; wherein burrs in a burr area on the roughened metal part are modeled in a layered mode in the height direction, and a metal body of the roughened metal part is modeled in a layered mode in the thickness direction; establishing a model conforming to the material part, and performing layered modeling on a burr penetrating area of the composite material part according to a laying layer; carrying out layered modeling on the non-bristle penetration thorn area by taking multiple layers as a unit layer; the burr penetrating area is an area with burr holes; wherein the burr hole models are in one-to-one correspondence with the burr models; performing contact connection on the inner surface of the burr flying hole and the outer surface of the burr; and performing contact connection on the contact interface of the burr penetrating area and the contact interface of the burr area to obtain a textured connecting piece model.
Description
technical field [0001] The invention belongs to the field of modeling and relates to a finite element comparative modeling method for textured connectors. Background technique [0002] Composite-metal integrated fusion joint is a new type of joint structure based on electron beam "texturing" technology, which can well connect composite materials and metals together. This kind of joint mainly uses the electron beam "texturization" technology to carry out surface treatment on the metal to form the required surface morphology, and then the metal and the composite material are co-cured by heating and pressing to obtain a composite material-metal integrated joint. The "burr" embedded in the composite material interacts with the fibers to increase the load-bearing capacity of the connection between the composite material and the metal by enhancing the interface strength. [0003] Existing technologies and patents only introduce the texturing technology and texturing process, but ...
Claims
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IPC IPC(8): G06F30/23G06F113/26G06F119/14
CPCG06F30/23G06F2113/26G06F2119/14
Inventor 李驰熊伟王斌团韩思聪王远芳陈军
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA