Designing and Manufacturing of Test Set Up for Rapid Crack Propagation Test with Experimental Measurement of Tip Crack Growth Speed in Transmission pipes

Subject Areas : Creep, Fatigue and Fracture Mechanic

Sayed Mahmoud Madani ¹ , Mohammadreza Forouzan ² , Ali Reza Salehian ³

1 - Department of Mechanical Engineering, Khominishahr Branch, Islamic Azad University, Khominishahr, Iran
2 - Department of Mechanical Engineering, Isfahan University of Technology, Esfahan, Iran
3 - Department of Mechanical Engineering, Khominishahr Branch, Islamic Azad University, Khominishahr, Iran

Received: 2019-04-09 Accepted : 2019-06-17 Published : 2019-08-23

Keywords: Rapid Crack Propagation (RCP), Timing wire system (TWS), High speed camera (HSC), Test set up,

Abstract :

Gas and liquid transmission is a routine activity in the oil industry, powerhouses, petrochemicals and nuclear industries. The pipes are exposed to micro cracks in the inner and outer surface due to factors like corrosion and fatigue in the manufacturing process. If the aligned cracks are all over, the rapid crack growth phenomenon occurs. In this case, crack will grow at high speed along the pipe axis. In this research that has been conducted for the first time in the country, the measurement of the growth rate of the crack tip is done in two ways: High-Speed camera and timing wire system in the seamless aluminum 6063-T5 pipes. The bursting pressure of the specimens with the initial crack depth of 0.8, 1.0 and 1.2 mm are 70, 65 and 58 bar. The resulting growth rates in High-Speed camera and timing wire system is about 120 to 132 and 120 to 126 m/s. The qualitative results of this research matches well with other researches in this field in other journals.