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Method for calculating strength of simultaneously tensioned and sheared bolt

A strength calculation and bolt technology, applied in the field of structural strength design, can solve problems such as complex calculations and poor pertinence

Active Publication Date: 2020-10-20
JIANGXI HONGDU AVIATION IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the above-mentioned deficiencies in the prior art, the present invention provides a method for calculating the strength of bolts under tension and shear at the same time. By summarizing empirical data, the calculation method researches and proposes a calculation method to effectively solve the problem of traditional fourth strength theory calculation. The lack of pertinence and complex calculation of the method

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  • Method for calculating strength of simultaneously tensioned and sheared bolt
  • Method for calculating strength of simultaneously tensioned and sheared bolt

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Embodiment Construction

[0018] The technical solution in the present invention will be clearly and completely described below in conjunction with an embodiment.

[0019] Assuming a material is 30CrMnSiA, a bolt with a diameter of 6mm is subjected to a tensile force and a shear force of 10000N at the same time, the σ of 30CrMnSiA b =1080MP a .

[0020] At first, calculate bolt strength by the method step of the present invention:

[0021] The tensile stress of the bolt is,

[0022] The bolt shear stress is,

[0023] The shear coefficient K is,

[0024] Then: σ=353.86MP a ≤0.65σ b =702MP a ;

[0025] τ=353.86MP a ≤τ b =Kσ b = 569.16;

[0026] The safety margin is:

[0027] Secondly, calculate the bolt strength according to the fourth strength theory:

[0028] The tensile stress of the bolt is:

[0029] The bolt shear stress is:

[0030] The resulting bolt stress is:

[0031] The safety margin is:

[0032] Finally, it can be seen from the above comparison that the bolt ...

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Abstract

The invention provides a method for calculating the strength of a simultaneously tensioned and sheared bolt. The method is mainly based on experience and statistical data and comprises steps of summarizing to obtain a calculation formula of the shear coefficient K, calculating the breaking shear stress according to a formula taub < / = K sigma b under the condition that the bolt is pulled and sheared at the same time, and enabling the tensile stress and the shear stress in the bolt to simultaneously meet constraint conditions that sigma is smaller than or equal to 0.65 sigma b and taub is smaller than or equal to taub during strength calculation design, thereby accurately calculating the bearing capacity of the bolt. The method for calculating the strength of the simultaneously-tensioned andsheared bolt is advantaged in that utilization efficiency of the bolt can be effectively improved, the method is closer to engineering practice, and the weight cost paid by structural conservative design can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of structural strength design, in particular to a method for calculating the strength of simultaneously tensioned and sheared bolts. Background technique [0002] In the design and calculation of the strength of mechanical structures, the bolts are complexly loaded. For example, most of the main load-bearing structures of aircraft are bolted connections, and the bolts are most commonly subjected to tension and shear at the same time. For the strength calculation of simultaneous tension and shear bolts, the traditional method is to use the fourth strength theory to complete. However, the calculation steps using the fourth intensity theory are complicated and the engineering application is not pertinent. [0003] If it can be based on multiple bolt strength tests and bolt strength design applications and verifications of multiple aircraft types, based on relevant experience and data, and comprehensive analysis of data,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/15G06F111/04G06F119/14
CPCG06F30/17G06F30/15G06F2119/14G06F2111/04
Inventor 张里伟张宪政朱亲强黄晓霞胡益富龚思楚侯方万志强黄瑞泉夏佳丽
Owner JIANGXI HONGDU AVIATION IND GRP