Geometric nonlinear analysis method for CFRP (carbon fiber reinforced plastic) laminated plate in humid and hot environment

A technology for geometrically nonlinear, hot and humid environments, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that are rarely found

Inactive Publication Date: 2021-10-08
HUNAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-order shear deformation of composite materials in hot and humid environments is rarely found in existing methods

Method used

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  • Geometric nonlinear analysis method for CFRP (carbon fiber reinforced plastic) laminated plate in humid and hot environment
  • Geometric nonlinear analysis method for CFRP (carbon fiber reinforced plastic) laminated plate in humid and hot environment
  • Geometric nonlinear analysis method for CFRP (carbon fiber reinforced plastic) laminated plate in humid and hot environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Embodiment 1: The length, width and height of the CFRP laminate meet 1, 1 and 0.002 respectively; the hot and humid environment satisfies ΔT=0~50C, Δc=0%~1%: when changing the hot and humid environment, the relationship between load-central deflection (W) and load-center bending moment relationship such as figure 1 shown.

[0059] From figure 1 It can be clearly seen that the increase of temperature and humidity increases the bending deflection and bending moment (bending stress) at the same time. Obviously, the hot and humid environment has an adverse effect on the bending behavior of CFRP. It is worth noting that in a hot and humid environment, the most important influence is the temperature factor, while the influence of humidity is very small. If the coefficient of thermal expansion α and the coefficient of wet expansion β are in the same order of magnitude, the hygrothermal force and moment are also in the same order of magnitude, but the difference between ΔT ...

Embodiment 2

[0060] Example 2: Considering the hot and humid environment ΔT=25C, Δc=0.5%; the three-dimensional deflection distribution of the CFRP plate and the three-dimensional distribution of the bending stress are as follows figure 2 and image 3 , where the corresponding contour lines are shown below.

[0061] figure 2 and image 3 It clearly shows the deformation of the whole CFRP plate under load. The maximum deflection is obviously at the midpoint, as in figure 2 shown. From image 3 The three-dimensional map and contour line in can clearly see the distribution position and magnitude of the bending stress. Since the structure and load of the CFRP plate are symmetrical to the center line, the figure 2 deflection and image 3 The bending stress is also symmetrical about the midline.

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Abstract

The invention relates to a geometric nonlinear analysis method for a carbon fiber reinforced plastic (CFRP) laminated plate under the action of uniformly distributed load in a humid and hot environment, and belongs to the technical field of modern engineering structure analysis and application, namely the influence of a humid and hot effect is considered in a CFRP engineering structure based on a Reddy high-order shear deformation theory. According to the method, aiming at solving the problem of damp and hot deformation in engineering materials, a geometric nonlinear control equation is deduced by utilizing a virtual displacement method, and the boundary condition is considered to be elastic limited rotation; then, physical parameters of the CFRP are regarded as constants in the damp-heat effect, a Galerkin method is used for solving a control equation, and the clamped rectangular CFRP laminated board is used; according to the method, the damp-heat deformation prediction of the engineering structure is realized by utilizing a nonlinear analysis method, a new method is provided for the structural damage prediction of the CFRP, and the method has certain guiding significance in reducing composite material structure accidents.

Description

technical field [0001] The invention relates to a geometrically nonlinear analysis method of a carbon fiber reinforced composite material laminated plate subjected to a uniformly distributed load in a hot and humid environment, and belongs to the technical field of modern engineering structure analysis and application. Background technique [0002] A variety of advanced composite materials are widely used in aerospace and other industrial fields in the 21st century. Composite materials, like other engineering materials, are used under certain environmental conditions. Common environmental conditions include humidity, temperature, aggressive media, UV radiation, loads, etc. For some composite materials, such as aerospace composite materials, the environmental conditions are more complex, such as high and low temperature alternating and rapid changes in the coefficient of moisture expansion. The action of one environmental condition or multiple environmental conditions can le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F113/26G06F119/14
CPCG06F30/20G06F2113/26G06F2119/14
Inventor 戴宏亮唐洪贺其
Owner HUNAN UNIV
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