Non-probabilistic time-variant reliability solution method of composite laminated plate

Abstract

The invention discloses a non-probabilistic time-variant reliability solution method of a composite laminated plate. The method comprises the steps: firstly, introducing a damage driving force and damage evolution concept based on a damage mechanic analysis theory, and establishing a structural damage evolution equation; secondly, comprehensively considering uncertainty of a variable, giving a reasonable quantification result of the variable by a non-probabilistic interval statistical method, introducing the interval variable into the equation, and constructing a damage evolution equation including the interval variable; and finally, performing non-probabilistic time-variant reliability analysis on a composite laminated plate structure according to a non-probabilistic reliability analysis method and a first-passage theory. Based on the fact, the method can provide theoretical bases for strength optimization design of large structures and the like under the conditions of poor information and less data and ensures that the design gives consideration to safety and economy.

Description

technical field [0001] The present invention relates to the technical field of solving the reliability index of the composite material laminated board structure, in particular to a method for solving the non-probability time-varying reliability of the composite material laminated board. In the case of incomplete probability information, the reliability in the time domain is also considered The change process of the index, the reasonable characterization of the time-varying reliability model of the laminated plate structure, and the establishment and formulation of the accurate solution method of the time-varying reliability. Background technique [0002] With its superior mechanical properties, composite materials have become a hot topic of research by scholars at home and abroad. For the typical structure of composite materials, laminates are widely used in various aspects such as aviation, aerospace, ships, and medical treatment. The depth and breadth of composite material ...

AI Technical Summary

Problems solved by technology

[0003] However, due to its own anisotropy and complex service environment, the engineering laminate structure has the influence of many uncertain sources, such as the uncontrollability of processing technology, the inhomogeneity of material properties, the measurement of geometric structure, etc. Fuzziness, randomness of external loads, etc. will aggravate the uncertainty of the damage of the plate structure, and the problem of incomplete probability information will appear, which is difficult to solve with the traditional probability reliability theory; on the other hand, the traditional reliability theory is aimed at The time-point reliability given by the time point, but in reality, reliability is a process that changes with time, and structural failure may occur at any time before time t. Traditional reliability analysis does not consider the relationship between the previous period and The correlation of the next moment, therefore, the time-point reliability cannot completely and accurately describe the structural reliability

It can be seen that the traditional structural point-in-time reliability analysis and solution methods are no longer applicable

Images