抄録
The authors has conducted some varying-constraint thermal fatigue experiments systematically, and found a conclusion that cycle maximum temperature Tmax as well as mechnical strain ε is the most sensitve factor in thermal fatigue.
Based on this assumption, a criterion for thermal fatigue failure has been proposed. That is, the relationship
ε2=ε02+Kexp(Q/Tmax)/N
gives a good fit for thermal fatigue test results of stainless steel, where ε0 is endurance limit, K and Q are constant.
In order to apply the criterion to practical design, the authors have introduced ε-Tmax-N curve.
In addition, the relation between thermal fatigue in case constraint is constant and that in case constraint is varying is also discussed.
