A modification of ASTM E 1457 C∗ estimation equation for compact tension specimen with a mismatched cross-weld

Time-dependent deformation and fracture of multi-material systems at high temperature

“…Our recent studies have found that large errors could be resulted in if the homogeneous material fracture parameters were used simply for analyzing the behavior of cracks in a multi-material system [14,30]. A modification of the conventional fracture parameters has hence to be made for the complexity like the bimaterial structures [15]. Optimization of material composition must be helpful on the view of design to improve the physical properties of the material system [31].…”

“…For the creep fracture analysis of multi-material system, the existing studies were generally focused on the finite element simulation of failure evolution [12,13], the development of closed form solution [14], the experimental determination of timedependent fracture parameter [15] as well as the creep damage and failure prediction [3,16]. Nevertheless, the structural integrity assessment of multi-material system is a comprehensive consequence of multiple factors, for example, the interface effect, edge effect, size effect and time-dependent effect should be appropriately accommodated.…”

Surface effects on time-dependent fracture parameter of subsurface crack in plates under tension

“…This increases the risk of structure failure under creep conditions. In such a case, rate dependent parameter of C * -integral (Xuan et al 2005) is appropriate for interpretation of creep crack growth (CCG) and creep crack initiation (CCI). However, it is worth noting that most of studies are focused on the creep analysis of a single semi-elliptical surface crack (Yoon et al 2003), and very little attention has been paid on the interaction of free-surface and near-surface crack.…”

A numerical creep analysis on the interaction of twin semi-elliptical cracks

“…In the elastic-plastic case, the fracture parameter J-integral should be employed to accommodate the influence of plastic deformation. In the presence of creep at high temperature, however, ratedependent parameter of C * -integral [2,3] is developed to correlate the data of creep crack growth (CCG) and creep crack initiation (CCI). In addition, results indicate that C * -integral is the most appropriate one among the existing fracture parameters for the interpretation of CCG and CCI.…”