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A Strength Envelope Method for Predicting Failure of Composite Bolted Connections Based on Progressive Damage Model

A strength envelope method and progressive damage technology, which is applied in the testing of mechanical components, testing of machine/structural components, measuring devices, etc., can solve the problems of large time and cost, inconvenient structural design and analysis, etc., and save time and cost, and the effect of improving structural design efficiency

Active Publication Date: 2017-02-15
BEIHANG UNIV
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Problems solved by technology

The strength envelope method based on experimental testing takes a lot of time and cost, which brings inconvenience to structural design and analysis

Method used

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  • A Strength Envelope Method for Predicting Failure of Composite Bolted Connections Based on Progressive Damage Model
  • A Strength Envelope Method for Predicting Failure of Composite Bolted Connections Based on Progressive Damage Model
  • A Strength Envelope Method for Predicting Failure of Composite Bolted Connections Based on Progressive Damage Model

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Experimental program
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Embodiment Construction

[0046] combine figure 2 with image 3 , the concrete realization of the inventive method is set forth as follows:

[0047] 1. Analyze the nail load distribution of the composite multi-nail connection structure to determine the key hole;

[0048] Using the stiffness method in the nail load distribution analysis method to analyze the nail load distribution of the composite multi-nail connection structure, the nail load coefficient of each nail is obtained, and the hole with the largest nail load coefficient is the key hole, thus determining the location of the key hole and Load factor for critical holes; load ratio for critical holes, that is, the ratio of crush load to bypass load, is calculated based on nail load distribution analysis results.

[0049] 2. Determine the strength envelope of the composite orifice plate in the multi-nail connection structure based on the progressive damage model;

[0050] Based on the ply parameters of the connection structure, the progressiv...

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Abstract

The invention relates to a strength envelope method based on a progressive damage model for predicting a composite bolt connection failure. The strength envelope method based on the progressive damage model for predicting the composite bolt connection failure comprises the steps that (1) nail load distribution analysis is conducted on a composite multi-nail connection structure according to the nail load distribution analysis method, so that the position, the loading coefficient and the load ratio, namely the ratio of the extrusion load to the bypass load, of a key hole are determined; (2) the strength envelope of a composite hole plate in the multi-nail connection structure is determined based on the progressive damage model; (3) the failure load of the key hole and the failure mode of the key hole are predicted according to the strength envelope of the composite hole plate; (4) the failure load of multi-nail connection structure is calculated according to the failure load of the key hole and the loading coefficient of the key hole, and the failure mode of the multi-nail connection structure is determined according to the failure mode of the key hole. The strength envelope method is suitable for analyzing the failure of the composite bolt connection structure in the engineering application, a strength envelope method based on testing is replaced, a large amount of time is saved, a large amount of cost is reduced, and the structure designing efficiency is improved.

Description

technical field [0001] The invention relates to failure prediction of composite material connection structures, and is suitable for complex composite material bolt connection structures widely used in aerospace vehicles. Background technique [0002] Advanced composite materials have many advantages such as high specific strength, high specific stiffness, excellent corrosion resistance, fatigue resistance and tailorable performance, and have become the main materials of modern aircraft structures. The force structure develops to the main load-bearing structure. The composite bolted connection structure is an important connection form of the composite material structure, and it is also the weak link of the composite material structure. Therefore, it is of great significance to accurately predict the failure of the composite material bolted connection for the design and analysis of the composite material bolted connection structure. [0003] With the accumulation of composite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G01M13/00
Inventor 赵丽滨秦田亮山美娟张建宇
Owner BEIHANG UNIV
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