Abstract
The C* integral for the compact tension (CT) specimen is calculated using the estimation equation in ASTM E1457-15. This equation was developed based on the assumption of material homogeneity and is not applicable to a welded CT specimen. In this paper, a modified equation for estimating the C* integral for a welded compact tension (CT) specimen under creep conditions is proposed. The proposed equation is defined on the basis of systematically conducted extensive finite element (FE) analyses using the ABAQUS program. A crack in the welded CT specimen is located in the center of the heat-affected zone (HAZ), because the most severe type IV cracks are located in the HAZ. The results obtained by the analysis show that the equation for estimating the C* integral in ASTM E1457-15 can underestimate the value of the C* integral for creep-soft HAZ and overestimate for creep-hard HAZ. Therefore, the proposed modified equation is suitable for describing the creep crack growth (CCG) of welded specimens.
Highlights
C* Integral for Mismatched WeldedWelding technology is one of the most common ways of joining metals in the chemical and petrochemical industries
The results obtained by the analysis show that the equation for estimating the C* integral in ASTM E1457-15 can underestimate the value of the C* integral for creep-soft heat-affected zone (HAZ) and overestimate for creep-hard HAZ
C* is estimated experimentally from measurements of creep load line displacement rate according from tests carried out on compact tension (CT) specimens based on the recommendations
Summary
Welding technology is one of the most common ways of joining metals in the chemical and petrochemical industries. The material constraint is due to the mismatch effect of creep properties in the welded joint components. A FE method was applied to two specimen types (the compact and middle crack tension specimen) with different material mismatches. FE method was applied to two specimen This equation crack tension specimen) with differentinmaterial established the existence ofbased the effect theassumption interaction between material homogeneity. The HAZ was not taken into influence of material and geometry constraints on C* and the CCG rate of welded joints eration in this study. Extensive elastic-creep two-dimensional finite element analysis was of material properties, HAZ width and crack length was performed. Based on the performed analyses, a modified equation for estimating the C* integral for welded CT samples
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
