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Fastener load calculation method after composite loaded wallboard enters tension field

A technology of load calculation and fasteners, applied in calculation, computer-aided design, instruments, etc., can solve problems such as low calculation accuracy, adverse effects of fastener strength checks, and lack of consideration

Active Publication Date: 2021-04-23
XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the existing calculation method of the fastener load after the wall panel enters the tension field does not consider the influence of the diagonal tension angle of the tension field on the fastener load under the combined load, resulting in the calculation of the fastener load after the wall panel enters the tension field. The accuracy is not high, which will have an adverse effect on the subsequent fastener strength check

Method used

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  • Fastener load calculation method after composite loaded wallboard enters tension field
  • Fastener load calculation method after composite loaded wallboard enters tension field
  • Fastener load calculation method after composite loaded wallboard enters tension field

Examples

Experimental program
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Effect test

Embodiment

[0080] Take the following panel as an example, skin length L=530mm, width W=170mm, thickness t=1.2mm, nail spacing s=22mm, nominal skin stress is σ x0 =40MPa,σ y0 =50MPa, τ=90MPa. Skin shear critical instability stress τ cr =35MPa, corrugation angle α=38°.

[0081] The calculation method is implemented as follows:

[0082] 1. Calculate the diagonal tensile stress and pure shear stress components produced by the nominal shear stress after the panel enters the tension field, such as figure 1 Shown:

[0083] The tension field coefficient k is:

[0084]

[0085] Diagonal tensile stress component σ TD for:

[0086]

[0087] Pure shear stress component τ S for:

[0088] τ S =(1-k)τ=72.0MPa

[0089] 2. Calculate the stress state produced by the nominal shear stress after the panel enters the tension field, such as figure 2 Shown:

[0090]

[0091] σ y =kτtanα=14.1MPa

[0092] τ xy =τ=90MPa

[0093] 3. Calculate the final stress state of the panel after ente...

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Abstract

The invention discloses a fastener load calculation method after a composite loaded wall plate enters a tension field, the composite loaded wall plate comprises a rectangular framework composed of stringers and vertical ribs, the rectangular framework is coated with a skin, and the skin is connected with the rectangular framework through fasteners; the method comprises the following steps: establishing a coordinate system by taking the center of a wallboard as an original point; calculating diagonal tensile stress and pure shear stress components generated by shear stress after the wallboard enters a tension field stress state; based on the diagonal tensile stress and the pure shear stress component, calculating a stress state generated by nominal shear stress after the wallboard enters a tension field through angle transformation; superposing the nominal normal stress of the wall plate, and calculating the final stress state of the wall plate after entering the tension field; and respectively calculating the loads of the fasteners in the x direction and the y direction of the wallboard. The defect that a traditional calculation method theoretically does not consider the influence of the diagonal tension angle of the tension field on the load resultant force of the fastener is overcome, and the theoretical calculation accuracy of the load of the fastener after the wallboard enters the tension field is improved.

Description

technical field [0001] The invention belongs to the field of structural static strength design and the field strength analysis direction of wall plate tension field, and relates to a method for calculating the load of skin butt joint fasteners after the composite loaded wall plate enters the tension field. Background technique [0002] Thin-walled reinforced structures are widely used in aerospace and other fields. Due to the characteristics of thin-walled reinforced structures, the structure will experience shear instability under shear loads, and then enter the state of tension field loading to continue bearing. Reasonable use of wall plates to enter the tension field for loading plays a very important role in improving structure utilization efficiency and reducing structure weight. Accurate calculation of the fastener load after the panel enters the tension field is the basis for the structural design and strength check of the panel. At present, the existing calculation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/15G06F113/24G06F113/28G06F119/14
CPCG06F30/15G06F2113/24G06F2113/28G06F2119/14
Inventor 刘彦杰杜鹏良张洪智
Owner XIAN AIRCRAFT DESIGN INST OF AVIATION IND OF CHINA
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