Transient high-temperature assembly parameter evolution prediction method for countersunk bolt mixed connection structure

Abstract

The invention provides a transient high-temperature assembly parameter evolution prediction method for a countersunk bolt mixed connection structure. According to the prediction method, theoretical prediction of the evolution conditions of the pre-tightening force and the nail hole gap of the ceramic matrix composite and high-temperature alloy countersunk bolt connection structure under the high-temperature transient heating condition is achieved through a sequential thermal coupling analysis method, the calculation process is simplified, the structural analysis calculation convergence is improved, important technical guidance is provided for strength analysis and design of the ceramic matrix composite and high-temperature alloy countersunk bolt connection structure, and the method has good practical application potential and can be popularized and applied to multiple technical fields such as aerospace, military and national defense, energy and chemical industry and the like.

Description

technical field [0001] The invention relates to a method for predicting the evolution of transient high-temperature assembly parameters of a countersunk bolt mixed connection structure, and belongs to the technical field of mechanical connection structure assembly of ceramic matrix composite materials. Background technique [0002] C / SiC ceramic matrix composites (CMC) have the characteristics of high temperature resistance, high specific strength / specific modulus, low thermal expansion coefficient, non-brittle fracture and good stability in high temperature environments, and are widely used in aerospace vehicle propulsion system components and high temperature thermal Structural components. The application of C / SiC ceramic matrix composites has derived a variety of connection technologies between CMC and metal primary or secondary structures. Among the existing connection methods, the bolted connection structure has attracted much attention because of its strong bearing ca...

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Problems solved by technology

These effects can lead to early damage to the connecting structure, jeopardizing the structural integrity and load-carrying capacity and efficiency of aircraft components

Judging from the current research status at home and abroad and the domestic patent retrieval situation, the research on the mechanical connection structure of ceramic matrix composites is still very limited, and the research analysis is mainly limited to the analysis of basic mechanical properties and experimental research. There are still research gaps in the prediction of the evolution of assembly parameters of mechanical connection structures under high-temperature transient thermal load conditions, which seriously hinders the design optimization and large-scale application of mechanical connection structures of ceramic matrix composites as key aerospace structural parts

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