Correlation of the Master curve reference temperature T0 with unified constraint parameter. (August 2021)

• Record Type: Journal Article
• Authors: Zheng, Y.; Wang, G.Z.; Wang, K.; Xuan, F.Z.; Tu, S.T.
• Is Part Of: Engineering fracture mechanics. Volume 253(2021)
• Publication Date: 2021-08
• Subjects: Master Curve -- Reference temperature -- Unified constraint parameter -- Correlation -- Brittle fracture; Fracture mechanics -- Periodicals; Rupture, Mécanique de la -- Périodiques; Fracture mechanics; Periodicals; 620.112605
• DOI: 10.1016/j.engfracmech.2021.107867
• Languages: English
• ISSNs: 0013-7944

Abstract

Highlights: Correlation between the Master Curve reference temperature T0 and constraint parameter Ad * was investigated. A linear T0 - Ad * correlation equation has been established and validated by experimental data. The equation has good capability to predict the T0 for any cracked structures. The equation is applicable to a wide range of materials, geometries, crack sizes, loading levels and temperatures. Abstract: The Master Curve (MC) reference temperature T0 is affected by specimen or component geometry, crack size and loading condition, i.e, affected by the crack-tip constraint. In order to apply the MC method in fracture assessment more accurately, it is necessary to consider the constraint effect and establish a quantitative correlation between T0 and constraint parameter. In this work, the correlation between the T0 and a new unified constraint parameter Ad *, which can characterize both in-plane and out-of-plane constraints, has been investigated. A large number of experimental fracture toughness and T0 data of different materials and specimen geometries in the literature were collected and used in the study. The parameter Ad * value of each specimen was calculated using finite element analysis. A linear T0 - Ad * correlation equation has been established and validated by experimental data. The equation has good capability to predict the MC T0 for any cracked structures, and it is applicable to a wide range of materials, structural geometries, crack sizes, loading levels and temperatures.