Measurement of Residual Stresses within a PWR Swaged Heater Tube

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Frequent failures of the pressuriser heater tubes used in Pressurised Water Reactors (PWRs) have been found. Axial cracks initiating from the tube outer diameter have been detected in some tubes as well as the resulting electrical problems. Replacement of the heater tubes requires an undesirably prolonged plant shutdown. In order to better understand these failures a series of residual stress measurements were carried out to obtain the near surface and through-thickness residual stress profiles in a stainless steel pressuriser heater tube. Three different residual stress measurement techniques were employed namely, Deep-Hole Drilling (DHD), Incremental Centre Hole Drilling (ICHD) and Sachs’ Boring (SB) to measure the through thickness residual stress distribution in the heater tubes. Results showed that the hoop stresses measured using all three techniques were predominantly tensile at all locations, while the axial stresses were found to be tensile at the surface and both tensile and compressive as they reduce to small magnitudes within the tube. The magnitude of the in-plane shear stresses was small at all measurement depths at all locations. The various measurement methods were found to complement each other well. All the measurements revealed a characteristic profile for the through-thickness residual stress distribution.

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Periodical:

Edited by:

R. L. Burguete, M. Lucas, E. A. Patterson, S. Quinn

Pages:

279-284

DOI:

10.4028/www.scientific.net/AMM.70.279

Citation:

D.M. Goudar et al., "Measurement of Residual Stresses within a PWR Swaged Heater Tube", Applied Mechanics and Materials, Vol. 70, pp. 279-284, 2011

Online since:

August 2011

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$38.00

[1] ASTM-E837-01, Standard Test Method for Determining Residual Stresses by the Hole-Drilling Strain Gage Method, ASTM, pp.670-679, (2001).

DOI: 10.1520/e0837

[2] G.S. Schajer, Measurement of Non-Uniform Residual Stresses Using the Hole Drilling Method, Journal of Engineering Materials and Technology, vol. 110, pp.338-343, (1988).

DOI: 10.1115/1.3226059

[3] Information on http: /www. vishaymeasurementgroup. com.

[4] A.A. Garcia-Granada, D.J. Smith and M.J. Pavier, A new procedure based on Sachs' boring for measuring non-axisymmetric residual stresses, International Journal of Mechanical Sciences, vol. 42, pp.1027-1047, (2000).

DOI: 10.1016/s0020-7403(99)00039-9

[5] G. Sachs, Nachweic Innerer Spannungen in Stange und Rohren, Zitschrift fur Metalkunde, vol. 19, pp.352-357, (1927).

[6] E.J. Kingston, D. Stefanescu, A.H. Mahmoudi, C.E. Truman and D.J. Smith, Novel Applications of the Deep-Hole Drillng Technique for Measuring Through-Thickness Residual Stress Distributions, Journal of ASTM International, vol. 3, No. 4, pp.1-12, (2006).

DOI: 10.1520/jai12568

[7] D. George, E.J. Kingston, and D.J. Smith, Measurement of Through-Thickness Stresses Using Small Holes, Journal of Strain Analysis for Engineering Design, Vol. 37, No. 2, pp.125-139, (2002).

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