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Fatigue Life Simulation and Prediction System Development for Cold Expanded Holes with Split Sleeve

Author: LiQingLin
Tutor: LiXiangFeng；ZuoDunWen
School: Nanjing University of Aeronautics and Astronautics
Course: Mechanical Manufacturing and Automation
Keywords: Cold extrusion hole Slotted bushing Fatigue life Finite Element BP neural network Orthogonal test
CLC: TG376.3
Type: Master's thesis
Year: 2008
Downloads: 139
Quote: 2
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Abstract


Hole slotted bushing the cold extrusion strengthen technology is the most advanced in the international aviation industry holes cold extrusion strengthening process is one of the connection structure of the life of the most effective measures to improve aircraft fasteners . In this paper , the first the slotted bushing cold LY12CZ aluminum alloy extrusion strengthen the hole process detailed analysis on the basis of a three-dimensional simulation study load stress field enhanced hole using ANSYS , then Slotted MSC.Fatigue to bush cold hole fatigue life of extruded strengthen the simulation study , the last off the the cold extrusion seam bush enhanced hole fatigue life based on BP neural network prediction model and forecast system jointly developed with VC and MATLAB . The main work and the results obtained are as follows: using ANSYS seam bush outside cold extrusion enhanced hole ( extrusion 2.5% ) simulation study load stress field has been strengthened hole , loading state The equivalent stress value in the slotted bushing openings , its value is about 300MPa, results consistent with the literature reference value . Using orthogonal experimental method to study cold extrusion strengthen hole extrusion process amount ( 1.2% , 2.5% , 3.8% , 5.1 %) , the coefficient of friction (0.1, 0.2 ) , bush ( Nil) to strengthen the hole loaded the degree of influence of the stress field . The results show that : the extrusion amount of its impact ; minimum coefficient of friction , negligible . 3 . The slotted bushing cold extrusion strengthen hole loading stress field simulation based on the use of the MSC.Fatigue its fatigue life simulation study . The results showed that: a slotted liner cold extrusion reinforced hole fatigue life minimum occurs in the slotted liner opening , the value of the fatigue life increasing the pressing amount is increased in the existing amount of compression of the range . Based on BP neural network the the slotted bushing cold extrusion strengthen the hole fatigue life prediction model 300M ultra - high -strength steel , 30CrMnSiA quenched and tempered steel , of A3 plain carbon structural steel test data for the training sample , LY12CZ aluminum alloy material forecast, made ??perfect prediction performance , fatigue life prediction system jointly developed with VC and MATLAB .

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal pressure processing > Extrusion > Extrusion process > Cold extrusion
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