Characterization of 3-D creep constraint and creep crack growth rate in test specimens in ASTM-E1457 standard

Unified creep constraint parameter solutions for surface cracks in plates under tensile and bending loads

“…30,31,[33][34][35] In order to characterize both constraints together, based on the crack-tip equivalent creep strain, a unified creep constraint parameter A c has been proposed. [33][34][35] The A c can characterize both out-ofplane and in-plane constraints in three-dimensional (3D) specimens and structures [33][34][35][36][37][38][39] and can be used to establish the constraint-dependent CCI time 9,10 and CCG rate for different materials. [33][34][35] And the CCI time in pressure pipes and specimens could also be accurately assessed by the C*-A c two-parameter approach.…”

Creep fracture parameter C* solutions for semi‐elliptical surface cracks in plates under tensile and bending loads

“…In addition, for the non-steady-state conditions, fracture parameter C t was proposed by Saxena to characterize creep crack growth (CCG). 21,22 And a large number of studies [23][24][25][26][27][28][29] indicated that the CCG rate can be well correlated with C*, which means that C* can be applied to predict and assess creep life of cracked components and devices under high temperature conditions.…”

Effects of side‐groove depth on creep crack‐tip constraint and creep crack growth rate in C(T) specimens

“…13,14 Recent numerical studies also indicated that the CCG rate increased with the increase of the side-groove depths in C(T) specimens for P92 steel 37 and Cr-Mo-V steel. 38 This may be caused by the effects of side-groove on creep crack-tip stress and strain states which are related to constraint effect. However, the side-groove effects on creep crack-tip constraint, hence on CCG rate, have not been quantitatively analyzed.…”