IJETSI

Title: CRACK GROWTH BEHAVIOR OF CRACKED COPPER PIPES (12200) UNDER CYCLIC TORSION LOADS
Authors: Dr. Fathi Alshamma, Shwan Abdulmuhsin Zainalaabdeen
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1Assistant Professor, College Of Engineering / University Of Baghdad, Baghdad, Iraq. 2Senior Eng., State Company For Oil Projects / Ministry Of Oil, Baghdad, Iraq.
MLA 8 Alshamma, Dr. Fathi, and Shwan A. Zainalaabdeen. "CRACK GROWTH BEHAVIOR OF CRACKED COPPER PIPES (12200) UNDER CYCLIC TORSION LOADS." IJETSI, vol. 2, no. 2, 2017, pp. 595-603, ijetsi.org/more2017.php?id=50. APA Alshamma, D., & Zainalaabdeen, S. A. (2017). CRACK GROWTH BEHAVIOR OF CRACKED COPPER PIPES (12200) UNDER CYCLIC TORSION LOADS. IJETSI, 2(2), 595-603. Retrieved from http://ijetsi.org/more2017.php?id=50 Chicago Alshamma, Dr. Fathi, and Shwan A. Zainalaabdeen. "CRACK GROWTH BEHAVIOR OF CRACKED COPPER PIPES (12200) UNDER CYCLIC TORSION LOADS." IJETSI 2, no. 2 (2017), 595-603. http://ijetsi.org/more2017.php?id=50.
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Abstract: This work investigate a crack propagation and the direction of crack path due to cyclic torsion effect on the different crack inclination in thin pipes where mixed modes (I/II) have been considered to estimate crack direction, therefore a new rig has been manufactured to simulate the real service conditions of small bore pipes under different loads with ?30 Hz (oscillation) which is suitable also to implement uniaxial and multi axial cyclic loads, however , cyclic torsion loads had been discussed in this study, so the experiments have been carried out concerning copper pipe (12200) under cyclic torsion load for specified stress ratio (R=-1) , and the results have been justified practically via crack trajectory that compared with previous well known formulas to illustrate the compatibility between these formulas and actual practice in real conditions. Moreover, state of art concept have been achieved by using previous theories regarding short crack and brittle material to be applicable with studied case for long crack in very ductile pipes. Good agreement has been received to demonstrate the validity of proposed rig for this kind of loads and the compatibility between previous theories with actual real service.

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