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Ceramic matrix composite bolt prefabricated body-structure integrated design method

A composite material and design method technology, applied in computer-aided design, calculation, instrument, etc., can solve the problems of different calculation results, inaccurate strength, and failure to consider the influence of ceramic matrix composite material structure, so as to achieve accurate model High degree of accuracy, improve prediction accuracy, and quickly modify the effect of the model

Active Publication Date: 2019-10-15
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

This bolt design method does not consider the effect of the mesostructure of ceramic matrix composites on structural failure
Bolts of the same material will have different calculation results due to different mesoscopic structures, so designing CMCs bolts only from a macro perspective will make the predicted strength inaccurate

Method used

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  • Ceramic matrix composite bolt prefabricated body-structure integrated design method
  • Ceramic matrix composite bolt prefabricated body-structure integrated design method
  • Ceramic matrix composite bolt prefabricated body-structure integrated design method

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Embodiment Construction

[0036] The present invention is described in further detail now in conjunction with accompanying drawing.

[0037] A ceramic matrix composite material bolt prefabricated body-structure integrated design method, the specific steps are as follows:

[0038] 1. Prefabricated body modeling

[0039]1) Set the layup thickness h, simplify the layup of needle-punched ceramic matrix composites into a rectangular flat plate with length, width and thickness respectively L, W and h, and stack n layers of layup along the thickness direction to form a length, width and thickness of Laminate model for L, W, and H, where H equals n*h.

[0040] 2) Set the diameter r and distance d of the needled fiber bundle, and then establish a cylinder model with a diameter r and a height H at equal intervals in the direction perpendicular to the layup as the needled fiber bundle model.

[0041] 3) Boolean operations are performed on the ply model and the needled fiber bundle model, and the ply model is se...

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Abstract

A ceramic matrix composite bolt fabricated body-structure integrated design method comprises the following steps: modeling a prefabricated body; carrying out structure modeling; deformation and failure calculation. According to the actual microstructure of the ceramic matrix composite, different small composites in the bolt are built, and macroscopic failure of the structure caused by microscopicfailure in the small composites can be achieved. The thread built by the method can reflect a thread tooth failure form, and the influence of complex stress conditions on the thread on a screw fracture failure form is also considered, so that the prediction accuracy of the strength of the CMCs bolt is improved. According to the actual size and shape of the structure, the ceramic-based composite material prefabricated body of a certain structure is built. The structure integrated model is high in model accuracy and capable of accurately reflecting all components of the material, macroscopic andmicroscopic structure parameters are given at the same time, and convenience is brought to machining of preparation personnel.

Description

technical field [0001] The invention belongs to the technical field of ceramic matrix composite materials, and in particular relates to a ceramic matrix composite material bolt prefabricated body-structure integrated design method. Background technique [0002] Ceramic matrix composites (CMCs) have the characteristics of high temperature resistance, so that they can be widely used in the working conditions where organic-based materials and metal-based materials cannot meet the performance requirements, and become ideal high-temperature structural materials. Bolted connections are widely used in large complex CMCs structures. However, due to the brittleness of the ceramic material itself, CMCs bolts are prone to failure forms such as screw fracture, thread tooth fracture, and bolt head fracture, resulting in structural failure and even major accidents. Therefore, how to design the structure and size of CMCs bolts so that they will not fail during service is a key issue for d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F30/17G06F2113/26
Inventor 高希光朱宝城宋迎东张盛于国强董洪年
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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