Creep strain measurements using an Alternating Current Potential Drop method: A Nondestructive approach

Yıl 2016, , 7 - 15, 03.06.2016

C.m. Omprakash A. Kumar R.n. Ghosh A. Sridhar B. Srivathsa D.v.v. Satyanarayana

https://doi.org/10.24107/ijeas.251261

Cited By: 1

Öz

Online assessment of the state of creep damage of a component in service is very useful in ensuring safety of structures, estimation of remaining life for life extension programs. Thus, in-situ monitoring of the progress of creep damage in such components is very important and a challenging task. Alternating current potential drop (ACPD) technique along with Linear Variable Differential Transducers (LVDT’s) was employed to measure voltage drop during creep tests of Alloy 718 at 600-700°C and 600-750MPa. The ACPD voltage drop data were subsequently converted into creep strain using appropriate formula and compared with the creep strain measured using LVDT’s. It has been observed that the creep strains derived from the ACPD data match well with the creep strains measured using LVDT for all the test conditions. This study demonstrates that the ACPD technique has a potential to be employed as an effective non-destructive tool for in-situ monitoring of creep strain in components

Anahtar Kelimeler

ACPD, Alloy 718, Creep, Superalloy

Kaynakça

• [1] Dover WD, Collins R, Michael DH, The use of AC-field measurements for crack detection and sizing in air and underwater, Philosophical Transactions of the Royal Society of London A, 320, 271- 83,1986.
• [2] Venkatasubramanian TV, Unvala BA, An AC potential drop system for monitoring crack length, Journal of physics E: Scientific instruments, 17,765-71, 1984
• [3] Ashok saxena, Electrical potential technique for monitoring subcritical crack growth at elevated temperatures, Engineering Fracture Mechanics, 13,741-750, 1980.
• [4] Yasumoto Sato,Takeo Atsumi , Tetsuo Shoji, Application of induced current potential drop technique for measurement of cracks on internal wall of tube-shaped specimens, NDT&E International, 40,497-504, 2007.
• [5] Andersson M, Persson C, Melin S, Experimental and numerical investigation of crack closure measurements with electrical potential drop technique, Int J Fatigue, 28,1059-1068,2006.
• [6] Dover WD, Charlesworth FDW, Taylor KA, Collins R, Michael DH, AC field measurementstheoryand practice, In: Beevers CJ,editor, The measurement of crack length and shape during fracture and fatigue, Warley, UK: Engineering Materials Advisory Service, 222-260, 1980.
• [7] Thompson CD, Carey DM, Perazzo NL, Proceedings of the eighth international symposium on environmental degradation of materials in nuclear power systems –water reactors, 366-71, 1997.
• [8] Mirshekar-Syahkal D, Collins R, Michael DH, The influence of skin depth on crack measurement by the AC field technique, J Nondestr.Eval, 3(2), 65-76,1982.
• [9] Saguy H, Rittel D, Flaw detection in metals by the ACPD technique: theory and experiments, NDT&E Int, 40, 505-9, 2007.
• [10] Connolly MP, Michael DH, Collins R, The inversion of surface potential measurements to determine crack size and shape, Journal of Applied Physics, 64(5), 2638-47,1988.
• [11] Mclver M, An inverse problem in electromagnetic crack detection, IMA Journal of Applied Mathematics, 47,127-45, 1991.
• [12] Michael D, Waechter R, Collins R, The measurements of surface cracks in metals by using A.C. electric fields, R. Soc. Proc. London A, 381,139-57, 1982.
• [13] Lugg MC, Data interpretation in ACPD crack inspection, NDT Int, 22(3), 149-54, 1989.
• [14] Ikeda K, Yoshimi M, Miki C, Electrical potential drop method for evaluating crack depth, Int J of Fracture, 47, 25-38, 1991.
• [15] Lai MO, Ng CK, Measurements of crack profiles using AC field measurement method, J of Non-Destructive Evaluation, 13(4), 155-63,1994.
• [16] McMaster RC. Electric current test principles. In: McMaster RC, Editor. Nondestructive testing handbook, 1sted.columbus, OH: American society for Nondestructive testing; 35.1-35.11, 1959.
• [17] Strommen RD, Horn H, Moldestad G, Ramsvik JK, Wold KR, FSM-non intrusive monitoring of internal corrosion, erosion and cracking, Anti-Corrosion methods and materials, 42(6),3-6, 1995.
• [18] Kaup PG, Santosa F, Vogelius M, Method for imaging corrosion damage in thin plates from electrostatic data, Inverse problems, 12:279-93, 1996.
• [19] Farrell DM, Robbins BJ, On-line monitoring of corrosion and crack growth on furnace wall tubes, In: MTI Euro TAC meeting, Brussels, 2008
• [20] Giuseppe Sposito , Peter Cawley, Peter B.Nagy, Potential drop mapping for the monitoring of corrosion or erosion, NDT&E International, 43,394-402, 2010.
• [21] Y Sato,T Atsumi , T Shoji, Continuous monitoring of back wall stress corrosion cracking growth in sensitized type 304 stainless steel weldment by means of potential drop techniques, Int J pressure vessels and piping , 84,274-283, 2007.
• [22] Bowler N, Huang Y, Model-based characterization of homogeneous metal plates by four-point alternating current potential drop measurements, IEEE Transactions on Magnetics, 41(6),2102-10, 2005.
• [23] Bowler JR, Bowler N, Theory of four-point alternating current potential drop measurements on conductive plates, Proceedings of the Royal Society of London A, 463,817-36, 2007.
• [24] Aditya Narayanan, Catrin M. Davies, Yasser K. Mahmoud, Use of the alternating currentpotential drop (ACPD) technique to monitor creep behaviour of austenitic steels, Proceedings of theASME 2013 Pressure vessels and Piping Conference, July 14-18, Paris, France, 2013.
• [25] Catrin M. Davies, Peter Nagy, Aditya Narayanan, Peter Cawley, Continuous creep damagemonitoring using a novel potential drop technique, Proceedings of the ASME 2011 Pressure vessels and Piping Division Conference, July 17-21, Baltimore, USA, 2011.
• [26] Elhoucine Madhi, Peter B. Nagy, Sensitivity analysis of a directional potential drop sensor for creep monitoring, NDT&E International, 44, 708-717, 2011.
• [27] Seeran Prajapati, Peter B. Nagy, Peter Cawley, Potential drop detection of creep damage in the vicinity of welds, NDT&E International, 47, 56-65, 2012.
• [28] Ioannis P. Vasatis, Regis M.Pelloux, dc Potential drop technique in creep stress rupture testing, Journal of Metals ,October, 44-49, 1985.
• [29] P.I.Vasatis, R.M.Pelloux, Application of the dc potential drop technique in investigating crack initiation and propagation under sustained load in notched rupture tests, Metallurgical Transactions A, Vol 19A, April, 863-871,1988.
• [30] R.M.Pelloux, J.M.Peltier, V.A.Zilberstein, Creep testing of 2.25Cr-1Mo welds by DC potential drop technique, Journal of Engineering Materials and Technology, 111, 19-20, 1989.
• [31] S.D.Mann, Creep strain monitoring using a d.c. potential drop technique, Materials Forum, 14, 147-150,1990.