Characterization of 3-D creep constraint and creep crack growth rate in test specimens in ASTM-E1457 standard. (December 2016)

• Record Type: Journal Article
• Authors: He, J.Z.; Wang, G.Z.; Tu, S.T.; Xuan, F.Z.
• Is Part Of: Engineering fracture mechanics. Volume 168:Part A(2016)
• Page Start: 131
• Page End: 146
• Publication Date: 2016-12
• Subjects: Creep constraint -- Creep crack growth rate -- ASTM-E1457 -- Specimen geometry -- Specimen size; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2016.10.009
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: The 3-D creep constraint of specimens in ASTM E1457 standard was characterized. The creep crack growth rate in the specimens were predicted by numerical simulations. The specimens recommended by ASTM-E1457 have different constraints and CCG rates. Larger specimen thickness and deeper side-groove induce higher constraint and CCG rate. It needs to consider constraint effects on CCG rate when predicting component life. Abstract: Three-dimensional creep constraint of six specimen geometries in ASTM E1457 standard was characterized by using two constraint parameters, and creep crack growth (CCG) rates in these specimens were predicted by using numerical simulations. The results show that the specimens with different geometries and size ranges recommended by ASTM-E1457 have different constraints, thus produce different CCG rate data. With increasing specimen thickness and side-groove depth, the constraint and CCG rates of all specimens increase. It needs to consider constraint effects on CCG rate when predicting component life using laboratory data. The quantitative correlation formulas of CCG rate with creep constraint have been established.