Calculation of the stress intensity factor in aluminum alloy A7075-T6 under biaxial loading

2000 ◽  
Vol 2000 (0) ◽  
pp. 279-280
Author(s):  
Jeng Hwan Nam ◽  
Akira Shimamoto ◽  
Taku Shimomura
Keyword(s):  
Stress Intensity Factor ◽  
Aluminum Alloy ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Biaxial Loading

scholarly journals Evaluation of stress intensity factor of multiple inclined cracks under biaxial loading

2012 ◽  
Vol 6 (22) ◽  
pp. 5-11 ◽  
Author(s):  
R. K. Bhagat ◽  
V. K. Singh ◽  
P. C. Gope ◽  
A.K. Chaudhary
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Biaxial Loading ◽  
Inclined Cracks

scholarly journals Experimental Evaluation on Mixed Mode I/II Stress Intensity Factors using CTS welded and non-welded specimen of Aluminum Alloy AA3003

2021 ◽  
Vol 9 (9) ◽  
pp. 1259-1265
Keyword(s):  
Stress Intensity Factor ◽  
Aluminum Alloy ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Mixed Mode ◽  
Pure Shear ◽  
Compact Tension ◽  
Shear Mode ◽  
Mode I ◽  
Intensity Factors

In the present paper, experimental investigation on the fracture of aluminum alloy AA3003 are conducted on the Compact Tension Shear CTS specimen non-welded and CTS specimen welded by FSW process under mixed mode loading by using Arcan loading device based on Richard’s principle suitable for mixed mode. All loading in mixed mode starting from pure tension (mode I) up to pure shear (mode II) can be obtained and tested by varying the loading angles from 0° to 90°. The stress intensity factor for the Compact Tension Shear (CTS) specimen are determined three normalized lengths cracks 0.3, 0.5 and 0.7.The length of notches influence on the variation of stress intensity factor KI, KII. For CTS specimen with notches with a short length, the values of KII are greater than those obtained for notches with a long length.

scholarly journals Ultrasonic and Conventional Fatigue Endurance of Aeronautical Aluminum Alloy 7075-T6, with Artificial and Induced Pre-Corrosion

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1033
Author(s):  
Ishvari F. Zuñiga Tello ◽  
Marijana Milković ◽  
Gonzalo M. Domínguez Almaraz ◽  
Nenad Gubeljak
Keyword(s):  
Stress Intensity Factor ◽  
Aluminum Alloy ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Crack Initiation ◽  
Transverse Direction ◽  
Fatigue Tests ◽  
Testing Specimen ◽  
Ultrasonic Fatigue ◽  
Fatigue Endurance

Ultrasonic and conventional fatigue tests were carried out on the AISI-SAE AA7075-T6 aluminum alloy, in order to evaluate the effect of artificial and induced pre-corrosion. Artificial pre-corrosion was obtained by two hemispherical pitting holes of 500-μm diameter at the specimen neck section, machined following the longitudinal or transverse direction of the testing specimen. Induced pre-corrosion was achieved using the international standard ESA ECSS-Q-ST-70-37C of the European Space Agency. Specimens were tested under ultrasonic fatigue technique at frequency of 20 kHz and under conventional fatigue at frequency of 20 Hz. The two applied load ratios were: R = −1 in ultrasonic fatigue tests and R = 0.1 in conventional fatigue tests. The main results were the effects of artificial and induced pre-corrosion on the fatigue endurance, together with the surface roughness modification after the conventional fatigue tests. Crack initiation and propagation were analyzed and numeric models were constructed to investigate the stress concentration associated with pre-corrosion pits, together with the evaluation of the stress intensity factor in mode I from crack initiation to fracture. Finally, the stress intensity factor range threshold ΔKTH was obtained for the base material and specimens with two hemispherical pits in transverse direction.

Does the Biaxial Loading Affect the Apparent Fracture Toughness (Kc)?

2019 ◽  
Author(s):  
Chentong Chen ◽  
Hanbin Xiao ◽  
Yuh J. Chao ◽  
Poh-Sang Lam
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Test Data ◽  
Biaxial Loading ◽  
Stress Component ◽  
Crack Tip ◽  
Apparent Fracture Toughness ◽  
Biaxial Load

Abstract From linear elastic fracture mechanics (LEFM), it is well accepted that only the singular stress near the crack tip contributes to the fracture event through the crack tip stress intensity factor K. In the biaxial loading, the stress component that adds to the T-stress at the crack tip, affects only the second term in the Williams’ series solution around the crack tip. Therefore, it is generally believed that biaxial load does not change the apparent fracture toughness or the critical stress intensity factor (Kc). This paper revisited several specimen geometries under biaxial loading with finite element method. The sources of discrepancy between the theory and the test data were identified. It was found that the ideal biaxial loading would not be achieved for typical fracture specimens with finite geometry. Comparison to available test data shows that, while the biaxial load could affect the apparent fracture toughness, the contribution is relatively small.

Does the Biaxial Loading Affect the Apparent Fracture Toughness (KC)?

2020 ◽  
Vol 142 (3) ◽  
Author(s):  
Chentong Chen ◽  
Hanbin Xiao ◽  
Yuh J. Chao ◽  
Poh-Sang Lam
Keyword(s):  
Fracture Toughness ◽  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Test Data ◽  
Biaxial Loading ◽  
Stress Component ◽  
Crack Tip ◽  
Apparent Fracture Toughness ◽  
Biaxial Load

Abstract From linear elastic fracture mechanics (LEFM), it is well accepted that only the singular stress near the crack tip contributes to the fracture event through the crack tip stress intensity factor K. In the biaxial loading, the stress component that adds to the T-stress at the crack tip, affects only the second term in the Williams' series solution around the crack tip. Therefore, it is generally believed that biaxial load does not change the apparent fracture toughness or the critical stress intensity factor (Kc). This paper revisited several specimen geometries under biaxial loading with finite element method. The sources of discrepancy between the theory and the test data were identified. It was found that the ideal biaxial loading would not be achieved for typical fracture specimens with finite geometry. Comparison to available test data shows that, while the biaxial load could affect the apparent fracture toughness, the contribution is relatively small.

Effect of Stress Ratio on Stress Intensity Factor of Type I Crack in A7N01 Aluminum Alloy

2018 ◽  
Vol 774 ◽  
pp. 259-264
Author(s):  
You Tang Li ◽  
Ya Dong Wang ◽  
Long Yang
Keyword(s):  
Stress Intensity Factor ◽  
Aluminum Alloy ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Stress Ratio ◽  
Crack Size ◽  
Size Ratio ◽  
Type I ◽  
Nodal Displacement ◽  
Finite Element Software

Taking the mode I crack of finite width plate as the research object, the nodal displacement extrapolation method of type I stress intensity factor is discussed, and the stress intensity factor expressed by nodal displacement is obtained. Taking A7N01 aluminum alloy as the research object, the finite element software ABAQUS was used to numerical simulation and analysis. The effect of stress ratio on stress intensity factor KI was discussed. The results showed that in the same crack size ratio a/W, the stress intensity factor increases with the increase of the stress ratio; at the same stress ratio R, the stress intensity factor increases with increasing crack size ratio. At the same time, change law of the stress intensity factor increase: under the condition of different stress ratio, when a/W≤0.6, the increase of stress intensity factor is almost consistent; when a/W>0.6, the increase of stress intensity factor will increase obviously.

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