Optimal design method for bending rigidity ply sequence of symmetrical composite laminate

A composite material layer, bending stiffness technology, applied in the direction of design optimization/simulation, geometric CAD, etc., can solve the problem that the initial parameters are extremely sensitive, the discrete characteristics of the laminate layer are not considered, the stiffness is superimposed by the layer, and the inherent sensitivity of the stiffness Problems such as information and engineering constraints of composite laminates are difficult to deal with

Active Publication Date: 2020-01-17
NORTHWESTERN POLYTECHNICAL UNIV
View PDF15 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) The optimization result is extremely sensitive to the initial parameters. For the same problem, repeated calculations are required to determine the appropriate initial parameters, and improper initial parameters will cause the algorithm to converge to a local solution in advance
[0006] (2) The optimization strategy of the heuristic algorithm, such as crossover, mutation, screening and other operators, does not consider the discrete characteristics of the laminate layer, the stiffness superposition rule by layer, and the intrinsic sensitivity information of the stiffness, which makes the heuristi

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optimal design method for bending rigidity ply sequence of symmetrical composite laminate
  • Optimal design method for bending rigidity ply sequence of symmetrical composite laminate
  • Optimal design method for bending rigidity ply sequence of symmetrical composite laminate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0103] This embodiment is a process of optimizing the layup sequence design of a rectangular laminate under specific boundary conditions.

[0104] The sequence permutation search algorithm is applied to the optimal design of the ply sequence of rectangular laminates to maximize the fundamental frequency of the laminates. The frequency of the laminate was solved using the Rayleigh-Ritz method. The rectangular laminate is an 8-layer symmetrical laminate, and the material constant is: E 1 =138Gpa,E 2 =8.96Gpa,G 12 =7.1Gpa,v 12 = 0.3. The model of a rectangular laminate such as Figure 8 Shown: Figure 8 The length, width, and height of the middle laminate are a, b, and h, respectively. A laminate consists of 2n plies, with ply positions z k and laminate orientation angle β k exist Figure 9 defined in , where, Figure 9 The formula on the right side of the middle is the coordinates of each ply in the thickness direction. Such as Figure 8 As shown, the boundary condi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides an optimal design method for bending rigidity ply sequence of symmetrical composite laminate, which comprises the following steps: screening a sensitivity laying angle at a certain specific laying position through a linear and nonlinear sensitivity detection technology, and sequentially replacing an existing laying angle with the sensitivity laying angle from a middle surface position to an external position for optimization. The method can effectively solve the problem of combined explosion of the equal-thickness composite laminated plate laying sequence design space, and the purposes of greatly improving the bending rigidity and improving the design efficiency are achieved.

Description

technical field [0001] The invention relates to the technical field of composite material laminates, in particular to an optimization design method for the bending stiffness laying sequence of symmetrical composite material laminates. Background technique [0002] Carbon fiber-reinforced resin-based composite materials have been widely used in modern aircraft thin-walled structures. The unidirectional tape refers to a thin sheet made of unidirectional fiber and resin with a thickness of about 0.2mm. The unidirectional tape is laminated together according to different orientation angles. The board is called a composite laminate or a laminated structure, and the orientation angle is also called the laying angle. A certain layup and its orientation angle are collectively called the corner layup, or simply called the layup. Equal-thickness composite laminates are mostly used in the shell structure inside the body, such as: stiffened plates, stiffened ribs and other structural pa...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06F30/20G06F30/15
Inventor 景钊孙秦
Owner NORTHWESTERN POLYTECHNICAL UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap