TY - JOUR
T1 - Continuum damage mechanics application in low-cycle thermal fatigue
AU - Mashayekhi, M.
AU - Taghipour, A.
AU - Askari, A.
AU - Farzin, M.
PY - 2013/3/1
Y1 - 2013/3/1
N2 - In this article, a fatigue model for low-cycle thermal fatigue formulated in a continuum damage mechanics framework is presented. The model is based on a unified damage law presented by Lemaitre for low-cycle fatigue, which has been extended to low-cycle thermal fatigue. The temperature dependencies of material parameters are considered in the damage evolution integration to take the non-isothermal condition of loading into account. This model considers the stress triaxiality and non-linearity of damage evolution, and it is developed to a fatigue damage accumulation rule in which the load sequence effect is also included. The stabilized structural response under thermomechanical loading motivates the use of uncoupled analysis approach making the model a fast tool suitable for design purposes in the costly and time-consuming field of thermomechanical fatigue life assessment. To demonstrate the capability and ease of use of this model for real industrial applications, the low-cycle thermal fatigue life of a stainless steel engine exhaust manifold which is in an early stage of design is assessed.
AB - In this article, a fatigue model for low-cycle thermal fatigue formulated in a continuum damage mechanics framework is presented. The model is based on a unified damage law presented by Lemaitre for low-cycle fatigue, which has been extended to low-cycle thermal fatigue. The temperature dependencies of material parameters are considered in the damage evolution integration to take the non-isothermal condition of loading into account. This model considers the stress triaxiality and non-linearity of damage evolution, and it is developed to a fatigue damage accumulation rule in which the load sequence effect is also included. The stabilized structural response under thermomechanical loading motivates the use of uncoupled analysis approach making the model a fast tool suitable for design purposes in the costly and time-consuming field of thermomechanical fatigue life assessment. To demonstrate the capability and ease of use of this model for real industrial applications, the low-cycle thermal fatigue life of a stainless steel engine exhaust manifold which is in an early stage of design is assessed.
KW - Continuum damage mechanics
KW - Damage evolution law
KW - Exhaust manifold
KW - Fatigue damage
KW - Low-cycle thermal fatigue
UR - http://www.scopus.com/inward/record.url?scp=84876561673&partnerID=8YFLogxK
U2 - 10.1177/1056789512448076
DO - 10.1177/1056789512448076
M3 - Article
AN - SCOPUS:84876561673
VL - 22
SP - 285
EP - 300
JO - International Journal of Damage Mechanics
JF - International Journal of Damage Mechanics
SN - 1056-7895
IS - 2
ER -