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Non-probability dynamic reliability assessment method of composite laminated structure

A composite material layer, laminated structure technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems such as unable to strictly meet the required application requirements, large safety redundancy, loss and so on

Active Publication Date: 2016-09-21
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the relevant research work is still immature, and the scheme design for the composite material laminated structure often cannot strictly meet the required application requirements, or the safety redundancy is too large, resulting in serious waste of resources and time cost

Method used

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  • Non-probability dynamic reliability assessment method of composite laminated structure
  • Non-probability dynamic reliability assessment method of composite laminated structure
  • Non-probability dynamic reliability assessment method of composite laminated structure

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Embodiment

[0141] In order to understand more fully the characteristics of the invention and its applicability to engineering practice, the present invention aims at such as Image 6 The shown 24-layer composite laminate structure was subjected to non-probabilistic dynamic reliability analysis. It adopts a symmetrical lay-up scheme [θ / θ / θ / θ / θ / θ / -θ / -θ / -θ / -θ / -θ / -θ] 对称 . The structure is subject to a concentrated load acting at the geometric center and is restrained by four-sided braces. The length l and width b of the board are both 100mm, and the thickness of each layer of board is t=0.147mm. The laminate material has transverse isotropy, and its density is ρ=1.38×10 3 kg / m 3 . The engineering strength parameter information of the laminate is shown in Table 1, and Table 2 lists the non-probabilistic static and dynamic uncertainty characteristics of the laminate modulus.

[0142] Table 1

[0143]

[0144] Table 2

[0145]

[0146] The method proposed according to the present in...

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Abstract

The invention discloses a non-probability dynamic reliability assessment method of a composite laminated structure facing whole life cycle. The method gives comprehensive consideration on a dynamic fluctuation effect of composite laminated structure load and accumulated degradation of material properties, and establishes a non-probability interval process model of the structure dynamic characteristics based on a finite element concept and an interval mathematic method, and then combining with a first passage theory and a failure determination criterion of a light laminated structure, non-probability dynamic reliability indexes of the structure are defined, and an efficient and steady solution strategy is explored. In a process of calculating reliability degree calculation, the method reasonably represents comprehensive influence of nondeterminacy on dynamic safety of the structure in the whole life cycle, and the method provides necessary data reference for ensuring refined design on the structure.

Description

technical field [0001] The invention relates to the technical field of safety assessment of lightweight composite laminated structures, in particular to the effective cognition and quantitative characterization of structural safety performance under the joint action of uncertainty, load alternation and material degradation, in order to rationally formulate composite material layers It provides important theoretical support for the material selection and layup scheme design of composite structures. Background technique [0002] Due to light weight, high strength and multi-functionality, composite laminates become engineering structural parts with excellent characteristics. In addition, in view of its own natural advantages such as large structural design margins and high performance matching, composite laminated structures are not only widely used in military fields such as aerospace, ships, and weapons, but also frequently appear as the most basic and important components. ...

Claims

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Application Information

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IPC IPC(8): G06F19/00
CPCG16Z99/00
Inventor 王磊王晓军陈潇王睿星陈贤佳郑宇宁邱志平
Owner BEIHANG UNIV
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