Mixed fatigue reliability optimization method aiming at composite material laminated plate

A composite material and optimization method technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as limiting the practical process of theoretical engineering, and achieve the effect of improving the accuracy and rationality of the solution and reducing the dependence.

Active Publication Date: 2016-09-07
BEIHANG UNIV
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Problems solved by technology

The above work has certain engineering practical value, but it ignores the degree of influence of the refined measurement of uncertain factors on the structural reliability, and the joint effect of random variables and interval variables, thus greatly limiting the engineering practical application of its theory

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  • Mixed fatigue reliability optimization method aiming at composite material laminated plate
  • Mixed fatigue reliability optimization method aiming at composite material laminated plate
  • Mixed fatigue reliability optimization method aiming at composite material laminated plate

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Embodiment

[0078] In order to understand more fully the characteristics of the invention and its applicability to engineering practice, the present invention aims at such as Figure 5 The proposed laminate structure shown is subjected to a fatigue hybrid reliability solution based on residual strength theory. The laminated plate structure bears cyclic load S∈N(317,12.6), fatigue life N=118000, the static strength of the laminated plate structure R∈[876,896], plate length l=100mm, plate width w=40mm, plate thickness t= 5mm, to investigate the fatigue reliability when the number of cycles n=70000 under working conditions, considering the geometric dimensions and loading conditions, using the established method for solving the mixed fatigue reliability, the mixed fatigue reliability can be calculated as 0.9786.

[0079] According to the desired mixed fatigue reliability index, with the allowable reliability as the constraint, the optimal design is carried out, and finally when the allowable...

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Abstract

The invention discloses a mixed fatigue reliability optimization method aiming at a composite material laminated plate. The mixed fatigue reliability optimization method comprises the steps of firstly taking a full consideration to existing multisource uncertain factors such as material intensity and useful load based on a small sample non-probabilistic method, integrating irregular sample data by applying a gray theory, exploring potential regularity of the irregular sample data and giving out a reasonable quantized result; then establishing a residual intensity model under the action of a fatigue load, introducing an uncertain parameter into a model and developing a non-probabilistic reliability solving method; then taking an overall consideration to a mixing form of a random variable and an interval variable, solving a mixing reliability index by utilizing an established non-probabilistic reliability solving method and combining with the probability reliability solving method; and finally carrying out composite material laminated plate thickness optimization design by regarding the mixing reliability index as constraint. Based on the mixed fatigue reliability optimization method aiming at the composite material laminated plate, intensity optimization design of large-scale structures in the presence of poor information and less data can be realized, and the design per se which considers both security and economy is ensured.

Description

technical field [0001] The present invention relates to the technical field of solving reliability indexes of composite laminated plate structures, in particular to the reasonable characterization of the fatigue mixed reliability model of laminated structures, considering the interaction of random variables and interval variables in the case of incomplete probability information. The establishment and formulation of the exact solution method of the 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 technology research has reached It has become an important benchmark for the development of national science and technology. Therefore, the research on the mechanical...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/367G06F2119/04
Inventor 王晓军马雨嘉王磊李晓田靖军
Owner BEIHANG UNIV
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