The Stress Concentration Factor (Kt) and Fatigue Crack Behavior on the Relative Defect Location in Monolithic Aluminum versus GLARE

2006 ◽  
Vol 321-323 ◽  
pp. 952-956
Author(s):  
Cheol Woong Kim ◽  
Kwang Lae Kim ◽  
Won Pyung Lee ◽  
Sung Hyuk Lee ◽  
Seok Heo
Keyword(s):  
Experimental Study ◽  
Fatigue Crack ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Crack Initiation ◽  
High Strength ◽  
Defect Location ◽  
Crack Behavior ◽  
Glass Fiber Reinforced ◽  
Made In

To analyze the stress distribution and the crack initiation due to the location of the defects, artificial defects were made on the different locations of the high strength monolithic Al and GLAss fiber REinforced laminate (GLARE). Experimental study shows that the defect location in the vicinity of the circular hole was changed from ° = 90 4 θ to ° = 0 1 θ , the stress concentration was increased. The stress concentration of GLARE was about 15% higher than that of the monolithic Al. When the defect was at ° = 30 2 θ , Multi Site Damage (MSD) crack was found in the monolithic Al but not in GLARE. Instead of MSD crack, a delamination was made in GLARE and that it resulted in the prevention against the second crack initiation.

The Effect of Defect Locations on the Stress Distribution and Crack Initiation in Monolithic Aluminum vs. GLARE Hybrid Composite

2005 ◽  
Vol 486-487 ◽  
pp. 354-357
Author(s):  
Cheol Woong Kim ◽  
Sam Hong Song ◽  
Dong Joon Oh
Keyword(s):  
Stress Concentration ◽  
Stress Distribution ◽  
Crack Initiation ◽  
Glass Fiber ◽  
Circular Hole ◽  
Hybrid Composite ◽  
Defect Location ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Laminates ◽  
Made In

This paper investigates the effect of the defect location on the stress concentration, the stress distribution, and the crack initiation behavior when the defects were made in the vicinity of the circular hole in the monolithic aluminum and the glass fiber reinforced laminates (GLARE). As the defect location in the vicinity of the circular hole was changed from ° = 90 4 q to ° = 0 1 q , the stress concentration was increased. Generally, the stress concentration of GLARE was about 15% greater than that of the monolithic aluminum. When the defect was at ° = 30 2 q , Multi Site Damage (MSD) crack was found in the monolithic aluminum, but just the main cracks existed in GLARE. The delamination instead of MSD crack was made in GLARE, and it resulted in the prevention against the second crack initiation.

Research on High Strength Aluminum Alloys Components Stress Analysis by Lock-In Thermography

2010 ◽  
Vol 29-32 ◽  
pp. 2775-2780
Author(s):  
Xun Liu ◽  
Jun Yan Liu ◽  
Jing Min Dai
Keyword(s):  
Stress Concentration ◽  
Aluminum Alloys ◽  
Stress Distribution ◽  
Stress Analysis ◽  
Principal Stress ◽  
High Strength ◽  
Temperature Deviation ◽  
Component Structure ◽  
Lock In ◽  
High Strength Aluminum Alloys

This paper describes a theoretical and experimental analysis on full-filed stress distribution from thermoelastic measurements and its application to determination of stress concentration. The sum of the principal stress can be measured by Thermal Stress Analysis (TSA). Lock-in Thermography has been applied to measure the sum of principal stress distribution of component structure by its high thermal resolving. In this study, Finite element method is used to calculate the sum of principal stress distribution, and the thermoelastic effect model is developed to study the relationship between the temperature deviation and the applied stress in an elastic material. Experiments were carried out with ANSI 7071 high strength aluminum alloys ply and ones with a crack under cyclic load. The thermoelastic constant is obtained for ANSI 7071 high strength aluminum alloys materials. The stress concentration factor is calculated for a ply with modeling crack under the condition of different loads. The experiment was carried out with high strength aluminum alloys component structure with rivet joints. The experimental results show the stress distribution can be measured and analyzed the contact stress distribution between ply and rivet by using Lock-in thermography. It was found that the structure stress can be evaluated with good accuracies by the lock in thermography.

The Thermal Fatigue Performance for Cast Iron Brake Drum of Large Trucks

2011 ◽  
Vol 117-119 ◽  
pp. 821-823
Author(s):  
Gao Lu ◽  
Wen Yan Wang ◽  
Jing Pei Xie
Keyword(s):  
Cast Iron ◽  
Stress Concentration ◽  
Crack Initiation ◽  
Thermal Fatigue ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Fatigue Crack Initiation ◽  
High Strength ◽  
Fatigue Properties ◽  
Brake Drum

This paper studies the application in different cast iron brake drum the thermal fatigue properties of materials. The results show that the stress concentration factor of grey cast iron, hot fatigue crack initiation, low intensity, and easy to expand, organization crack initiation poor stability, antioxidant ability is poor, thermal fatigue is poorer. 35% of vermicular cast iron and of ductile iron high strength, toughness, good stress concentration factor small, thermal fatigue is well.

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