TY - GEN
T1 - Study of crack propagation under fatigue equibiaxial loading
AU - Bradaï, S.
AU - Gourdin, C.
AU - Gardin, C.
N1 - Publisher Copyright:
Copyright © 2014 by ASME.
PY - 2014/1/1
Y1 - 2014/1/1
N2 - In some nuclear power plant components, the fatigue loading may be equibiaxial because of thermal fatigue. As a consequence, the potential impact of multiaxial loading on the fatigue life of components is a major concern. However, few experimental data are available about austenitic stainless steels. It is essential to improve the fatigue assessment methodologies taking into account the potential equibiaxial fatigue damage. It implies obtaining experimental data on the considered material, with a strain tensor corresponding to equibiaxial tension. Many multiaxial criteria, based on thermal fatigue tests or uniaxial fatigue tests, were proposed by Von Mises, Zamrik and other researchers [cited in 1]. Yet, additional thermal fatigue tests and isothermal equibiaxial fatigue tests must be carried out. In this context, a new experimental fatigue device FABIME2 [cited in 2] is developed, in the LISN, in collaboration with EDF and AREVA, in order to characterize accurately the possible equibiaxiality effect on the fatigue behavior of the 316L austenitic stainless steel. This paper is focused on the identification of a new criterion in order to be able to take into account the possible effect to the equibiaxial loading on fatigue life. It will be identified by a comparison of experimental results and numerical predictions. In this aim, a test campaign with several experiments was realized on the new FABIME2 device, in order to determine the crack growth rate from an equibiaxial fatigue loading. Propagation tests were carried out on 316L austenitic stainless steel CT specimens, at room temperature, in order to obtain the Paris law [cited in 3]: (crack growth rate da/dN versus the applied stress intensity factor range AK). The crack growth is followed throughout equibiaxial test. This allows obtaining, the da/dN evolution, and the corresponding AK values. A finite element modeling done with CASTEM®, will be proposed to simulate the crack propagation in the FABIME2 specimen using a 3-dimensional approach, considering a semi-elliptical crack shape.
AB - In some nuclear power plant components, the fatigue loading may be equibiaxial because of thermal fatigue. As a consequence, the potential impact of multiaxial loading on the fatigue life of components is a major concern. However, few experimental data are available about austenitic stainless steels. It is essential to improve the fatigue assessment methodologies taking into account the potential equibiaxial fatigue damage. It implies obtaining experimental data on the considered material, with a strain tensor corresponding to equibiaxial tension. Many multiaxial criteria, based on thermal fatigue tests or uniaxial fatigue tests, were proposed by Von Mises, Zamrik and other researchers [cited in 1]. Yet, additional thermal fatigue tests and isothermal equibiaxial fatigue tests must be carried out. In this context, a new experimental fatigue device FABIME2 [cited in 2] is developed, in the LISN, in collaboration with EDF and AREVA, in order to characterize accurately the possible equibiaxiality effect on the fatigue behavior of the 316L austenitic stainless steel. This paper is focused on the identification of a new criterion in order to be able to take into account the possible effect to the equibiaxial loading on fatigue life. It will be identified by a comparison of experimental results and numerical predictions. In this aim, a test campaign with several experiments was realized on the new FABIME2 device, in order to determine the crack growth rate from an equibiaxial fatigue loading. Propagation tests were carried out on 316L austenitic stainless steel CT specimens, at room temperature, in order to obtain the Paris law [cited in 3]: (crack growth rate da/dN versus the applied stress intensity factor range AK). The crack growth is followed throughout equibiaxial test. This allows obtaining, the da/dN evolution, and the corresponding AK values. A finite element modeling done with CASTEM®, will be proposed to simulate the crack propagation in the FABIME2 specimen using a 3-dimensional approach, considering a semi-elliptical crack shape.
U2 - 10.1115/PVP2014-28417
DO - 10.1115/PVP2014-28417
M3 - Conference contribution
AN - SCOPUS:84911966722
T3 - American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
BT - High-Pressure Technology; ASME NDE Division; 22nd Scavuzzo Student Paper Symposium and Competition
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 2014 Pressure Vessels and Piping Conference, PVP 2014
Y2 - 20 July 2014 through 24 July 2014
ER -