Fatigue life prediction method for CFRP-metal mixed bolt connection structure under competitive failure

A technology of fatigue life prediction and fatigue life, which is applied in the field of CFRP-metal hybrid bolt connection structure and fatigue life prediction of CFRP-metal hybrid bolt connection structure, and can solve problems such as competitive fatigue failure

Active Publication Date: 2020-07-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, when CFRP and metal materials form a bolted connection structure, there is a competitive fatigue failure between the lap plates in the connection structure

Method used

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  • Fatigue life prediction method for CFRP-metal mixed bolt connection structure under competitive failure
  • Fatigue life prediction method for CFRP-metal mixed bolt connection structure under competitive failure
  • Fatigue life prediction method for CFRP-metal mixed bolt connection structure under competitive failure

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Embodiment 1

[0063] Example 1: Fatigue life prediction of CFRP-aluminum alloy two-nail double-shear connection structure

[0064] CFRP-aluminum alloy two nail double shear bolt connection structure such as figure 2 As shown, the middle plate is a CFRP laminate, and the two sides are aluminum alloy plates. The fastener bolts are made of Ti-6Al-4V titanium alloy, and a tightening torque of 5.0 N m is applied to the two fasteners.

[0065] The steps to implement fatigue life prediction are as follows:

[0066] 1. According to the structural parameters of the CFRP-aluminum alloy two-nail double-shear connection, a three-dimensional finite element model of the structure is established in the finite element software ABAQUS, and the free ends of the aluminum plates on both sides are completely constrained. In the 3D finite element model, contact pairs are defined on the contact surfaces of CFRP plate and aluminum plate, CFRP plate and fastener, and aluminum plate and fastener.

[006...

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Abstract

The invention discloses a fatigue life prediction method for a CFRP-metal mixed bolt connection structure under competition failure. The method comprises the following steps: (1) predicting the fatigue life of the CFRP plate by adopting an improved progressive fatigue damage model; establishing a three-dimensional finite element model of the connection structure for stress analysis; calculating the mechanical property of the composite material which is gradually degraded under the fatigue load, checking the failure state of the composite material containing damage by applying the extended maximum strain criterion, carrying out rigidity degradation on the failed material, and finally obtaining the fatigue life of the CFRP plate according to the residual strength when the structure fails. (2) predicting a theoretical value of the fatigue life of the metal plate by adopting a nominal stress method; and (3) comparing the predicted fatigue life value of the CFRP laminated plate with the fatigue life value of the metal plate, and predicting the fatigue life and failure mode of the hybrid connection structure under the competitive failure. The method is suitable for engineering application, the fatigue life of the CFRP-metal mixed bolt connecting structure can be effectively predicted, and reference is provided for engineering practice.

Description

technical field [0001] The present invention relates to the problem of fatigue life prediction when the CFRP-metal hybrid bolt connection structure bears fatigue load, and specifically relates to a method for predicting the fatigue life of the CFRP-metal hybrid bolt connection structure under competitive failure, which is applicable to various aerospace vehicles widely used A CFRP-metal hybrid bolt connection structure. Background technique [0002] Due to its high specific strength, high specific stiffness and other good mechanical properties, carbon fiber reinforced composites (CFRP) have been widely used in aircraft main load-bearing structures with high load-bearing capacity, high efficiency and high reliability requirements. Although advanced composite materials are widely used in aircraft structures, traditional metal materials are still widely used in aircraft components due to their manufacturing process and cost. Taking the Airbus A350 aircraft as an example, the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F30/15G06F119/02G06F119/14
Inventor 赵丽滨张娇蕊刘丰睿
Owner BEIHANG UNIV
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