TY - JOUR
T1 - Digital image correlation study of mechanical response of nickel superalloy Hastelloy X under thermal and mechanical cycling
T2 - Uniaxial and biaxial stress states
AU - Swaminathan, Bharath
AU - Lambros, John
AU - Sehitoglu, Huseyin
N1 - Funding Information:
This study received the support in part of the Midwest Structural Sciences Center (MSSC), which is sponsored by the Air Force Research Laboratory under agreement number FA8650-06-2-3620, and the support of AFOSR award no. FA9550-12-1-0386 (Dr David Stargel is the program monitor).
PY - 2014/5
Y1 - 2014/5
N2 - The cyclic plastic strain accumulation of a dynamic strain aging Ni-based superalloy, Hastelloy X, is investigated using digital image correlation under both uniaxial and biaxial thermomechanical loading conditions. Thermal cycling and uniaxial mechanical tensile loading demonstrate that this material exhibits a Cottrell-Stokes-type response in which yield stress is not fully recovered after a mechanical loading cycle followed by a second isothermal loading cycle at elevated temperature (between room temperature and 600 °C in this work). The Portevin-Le Chatelier dynamic strain aging effect at higher temperatures, which has been seen to occur in this material, may also contribute to this reduction in flow stress. Additionally, under biaxial stress states introduced by means of a double-notch experimental sample, various cyclic thermal and mechanical loading combinations demonstrated a complex thermomechanical plastic response of this material. For example, cyclic thermal loading experiments at fixed displacement amounts for each cycle show greater plastic strain accumulation after three cycles when cycling is performed at a combination of 300 °C and 600 °C than that for three isothermal 600 °C cycles.
AB - The cyclic plastic strain accumulation of a dynamic strain aging Ni-based superalloy, Hastelloy X, is investigated using digital image correlation under both uniaxial and biaxial thermomechanical loading conditions. Thermal cycling and uniaxial mechanical tensile loading demonstrate that this material exhibits a Cottrell-Stokes-type response in which yield stress is not fully recovered after a mechanical loading cycle followed by a second isothermal loading cycle at elevated temperature (between room temperature and 600 °C in this work). The Portevin-Le Chatelier dynamic strain aging effect at higher temperatures, which has been seen to occur in this material, may also contribute to this reduction in flow stress. Additionally, under biaxial stress states introduced by means of a double-notch experimental sample, various cyclic thermal and mechanical loading combinations demonstrated a complex thermomechanical plastic response of this material. For example, cyclic thermal loading experiments at fixed displacement amounts for each cycle show greater plastic strain accumulation after three cycles when cycling is performed at a combination of 300 °C and 600 °C than that for three isothermal 600 °C cycles.
KW - High temperature
KW - Portevin-Le Chatelier effect
KW - cyclic plasticity
KW - digital image correlation
KW - notch
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U2 - 10.1177/0309324713503959
DO - 10.1177/0309324713503959
M3 - Article
AN - SCOPUS:84899126429
SN - 0309-3247
VL - 49
SP - 233
EP - 243
JO - Journal of Strain Analysis for Engineering Design
JF - Journal of Strain Analysis for Engineering Design
IS - 4
ER -