Investigation on Residual Strength of Airplane Plate with Smooth Circular Hole

2013 ◽  
Vol 331 ◽  
pp. 31-34
Author(s):  
Wu Wen Yao ◽  
Ping Zhou ◽  
Sheng Li Hou ◽  
Yun Kui Gao
Keyword(s):  
Circular Hole ◽  
Linear Elasticity ◽  
Residual Strength ◽  
Damage Assessment ◽  
Yield Criterion ◽  
Calculation Model ◽  
Battle Damage Assessment ◽  
Section Yield ◽  
Calculation Models

In order to solve the fight problem of damaged airplane in war, based on linear elasticity, elastoplasticity and net section yield criterion, the calculation model for residual strength of plate with smooth circular hole is founded. Furthermore, the flexibility of calculation models using these three methods is analyzed through examples. All above can be basis for airplane battle damage assessment.

Study on Spare Part Requirement Prediction Model of Aircraft Battle Damage Assessment and Repair Based on Layer Analysis Method

2013 ◽  
Vol 331 ◽  
pp. 626-630 ◽  
Author(s):  
Wu Wen Yao ◽  
Kai Long Cai ◽  
Ping Zhou ◽  
Yan Li
Keyword(s):  
Prediction Model ◽  
Damage Assessment ◽  
Spare Part ◽  
Analysis Method ◽  
Layer Analysis ◽  
Aircraft Component ◽  
Battle Damage Assessment ◽  
Set Up ◽  
Damage Number ◽  
Calculation Models

The necessity and actuality of spare part requirement prediction on aircraft battle damage assessment and repair were analysised. The calculation models, such as the quantity of the battle damage aircraft, the battle damage number of aircraft component, the equipment of aircraft battle damage assessment and repair, were set up. They could provide the reference and basis for constituting the advance project of aircraft battle damage assessment and repair and for repair guarantee.

Experimental Study on Residual Strength of Panels with Multiple Site Damage

2012 ◽  
Vol 525-526 ◽  
pp. 369-372
Author(s):  
Xiao Zhong Yan ◽  
Sheng Nan Wang ◽  
Wen Wang
Keyword(s):  
Residual Strength ◽  
Yield Criterion ◽  
Strength Test ◽  
Test Results ◽  
Multiple Site ◽  
Accuracy Requirement ◽  
Multiple Site Damage ◽  
Crack Initiation Life ◽  
Section Yield

The fatigue test of typical bolt-hole panels with five open holes in a line and the residual strength test of the panels with multiple site crack (MSD) were carried out. The crack initiation life of the test panels and the residual strength of the panels with different MSD crack sizes were obtained by the tests. The application of the net section yield criterion in the determination of residual strength of the panel containing multiple site damage was studied by comparing the calculated results with the test results. The conclusion is that the criterion meets the engineering accuracy requirement in the case of smaller MSD cracked area or smaller MSD crack sizes.

Aircraft Battle Damage Assessment and Repair (ABDAR). Volume 3: Field Test Report

2000 ◽  
Author(s):  
Scott MacBeth ◽  
Johnnie Jernigan ◽  
Jackie Grody ◽  
Donald L. Thomas ◽  
Michael E. Clark
Keyword(s):  
Field Test ◽  
Damage Assessment ◽  
Test Report ◽  
Battle Damage Assessment

Modified Swift Criteria for Residual Strength of Multiple Site Damage Structure

2009 ◽  
Vol 417-418 ◽  
pp. 881-884 ◽  
Author(s):  
Jian Yu Zhang ◽  
Rui Bao ◽  
Bin Jun Fei
Keyword(s):  
Residual Strength ◽  
Yield Criterion ◽  
Fatigue Cracks ◽  
Tensile Load ◽  
Maximum Load ◽  
Alloy Sheet ◽  
Multiple Cracks ◽  
Multiple Site ◽  
Multiple Site Damage ◽  
Aluminum Panels

As more aircrafts reach or exceed their design life, it is becoming very important to research multiple cracks damage, especially the multiple site damage (MSD) in order to re-evaluate their service life and damage tolerance/durability performance. The existing of MSD may remarkably reduce the residual strength of an aerospace structural component than those with a singe lead crack. This study investigated the residual strength of aluminum alloy sheet with MSD through three types of aluminum specimens test. Aluminum panels with bare collinear constant diameter holes were chosen as specimens. After some constant amplitude tension-tension load cycles, the MSD were found in these specimens since there were multiple fatigue cracks emanating from the saw cuts of holes. The residual strength was recorded as the maximum load when every specimen was subjected to monotonically increasing tensile load until failure occurred. In different failure prediction criteria that were often used in engineering in order to evaluate the accuracy of these criteria, Swift criterion (ligament yield) criterion got more accurate prediction results than other criteria. Although Swift criterion was more accurate than some other criteria, its error was still big for some specimens. Two modified approaches were proposed in order to get more accurate and appropriate failure criterion for MSD structure.

Damage Assessment of the Attacked Airports Based on Image Analysis

2013 ◽  
Vol 321-324 ◽  
pp. 1168-1171
Author(s):  
Xiao Nan Zhang ◽  
Jun Feng Yang ◽  
Si Liang Du ◽  
Jun Zhi
Keyword(s):  
Damage Assessment ◽  
Automatic Method ◽  
Analysis Method ◽  
Image Information ◽  
Damage Degree ◽  
Before And After ◽  
Battle Damage Assessment ◽  
Damage Extent ◽  
Modern War ◽  
Assessment Result

Battle Damage Assessment (BDA) is to assess the damage degree of enemy’s target after being attacked. In modern war, combat commanders always make decision on the basis of BDA. In this paper, an automatic method for assessing the damage extent of an attacked airport based on the image taken before and after a strike is described. Firstly, the airport blockade condition is analyzed and damage assessment criteria of airport are proposed. Secondly, three steps of the image information pretreatment are carried out and a reliability analysis method of image information is proposed. Lastly, damage assessment result is calculated to verify the validity and availability of the proposed method.

The Pose of Data Model and Research Based on Analysis of Intelligent Test Paper

2013 ◽  
Vol 303-306 ◽  
pp. 2203-2206
Author(s):  
Cai Li Fang ◽  
Lin Wu
Keyword(s):  
Data Model ◽  
Paper Analysis ◽  
Calculation Model ◽  
Test Paper ◽  
Fast Reaction ◽  
Analysis Algorithm ◽  
The Future ◽  
Education Measurement ◽  
Calculation Models

As a important part of teaching, Traditional paper analysis algorithm is complicated and not comprehensive enough. This paper according to the indicators of education measurement and improves the traditional calculation models, the system assesses the perfect calculation model, The teacher also can get the true and fast reaction to students' knowledge and the quality of the paper. This method thereby provides a convincing basis for the improvement on the future teaching and increase the effectiveness in teaching

scholarly journals Coupling numerical model of hydraulic fracturing seepage in soft coal based on elastoplastic damage

2020 ◽  
Vol 198 ◽  
pp. 01038
Author(s):  
LI Liangwei
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Hydraulic Fracturing ◽  
Yield Criterion ◽  
Calculation Model ◽  
Field Application ◽  
Soft Coal ◽  
Plastic Shear Strain ◽  
Strain Relationship ◽  
Relationship Equation

In order to guide the field application of hydraulic fracturing of soft coal in coal mine, based on the elastic-plastic damage theory, the coupling numerical model of soft coal hydraulic fracturing seepage was studied. The porosity strain relationship equation, permeability strain relationship equation, the relationship between permeability and volume plastic tensile strain and volume plastic shear strain of coal and rock mass are derived, and the plastic correction equation and softening parameters are defined. The stress coupling equation and yield criterion are programmed and embedded into the finite difference software FLAC3D for numerical solution. The numerical simulation shows that the numerical calculation model of soft coal hydraulic fracturing conforms to the actual law, and the field fracturing radius investigation experiment is consistent with the numerical simulation results.

Impact damage assessment by using peridynamic theory

2012 ◽  
Vol 2 (4) ◽  
Author(s):  
Erkan Oterkus ◽  
Ibrahim Guven ◽  
Erdogan Madenci
Keyword(s):  
Residual Strength ◽  
Damage Assessment ◽  
Impact Damage ◽  
Material Model ◽  
Mixed Mode Fracture ◽  
Simple Material ◽  
Peridynamic Theory ◽  
Load Paths ◽  
Compression After Impact ◽  
Building Components

AbstractThis study presents an application of peridynamic theory for predicting residual strength of impact damaged building components by considering a reinforced panel subjected to multiple load paths. The validity of the approach is established first by simulating a controlled experiment resulting in mixed-mode fracture of concrete. The agreement between the PD prediction and the experimentally observed behavior is remarkable especially considering the simple material model used for the concrete. Subsequently, the PD simulation concerns damage assessment and residual strength of a reinforced panel under compression after impact due to a rigid penetrator.

Calculation Model for Ground Settlement Process of Xi’an Subway Tunnel Non-Synchronous Excavation with Double-Line

2011 ◽  
Vol 90-93 ◽  
pp. 2221-2225
Author(s):  
Fang Tao She ◽  
Sheng Jun Shao ◽  
Juan Fang ◽  
Yang Yang Jiao
Keyword(s):  
Control Function ◽  
Calculation Model ◽  
Ground Settlement ◽  
Subway Tunnel ◽  
Tunnel Excavation ◽  
Probability Curve ◽  
Double Line ◽  
Building Foundation ◽  
Current Calculation ◽  
Calculation Models

The current calculation models of ground settlement for tunnel excavation cannot reflect ground settlement of tunnel non-synchronous excavation with double-line. Based on the Peck ground settlement formula and Attewell ground settlement formula, displacement release of excavation place and tunnel non-synchronous excavation with double-line have researched. By means of finding a function to replace the accumulated probability curve, the new control function was beneficial to parameter introduced and improvement of the current ground settlement formula. By introducing the non-synchronous excavation distance and the displacement release coefficient of excavation place, A new calculation model for ground settlement process of tunnels non-synchronous excavation with double-line is proposed. The reliability and practical of the calculation models was verified. Research results were very important to analyze the ground settlement affecting the building foundation and pipe under ground.

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