Experimental verification of the crack opening displacement using finite element method for CT specimens made of Ti6Al4V titanium alloy

Abstract

Description of fatigue crack growth in steel structural components using energy approachInfluence of the microstructure on the FCGR AIP Conference Proceedings 1780, 050003 (2016) Abstract When determining the characteristics of the fatigue crack growth rate, it is necessary, inter alia, to measure the crack length growth which must be combined with the number of accumulated load cycles. The length of the crack is determined using different testing methods. Recently, there is an increased interest in optical systems based on digital image correlation methods. These methods have however some limitations as regards, inter alia, the sharpness of pictures taken during tests e.g. at cryogenic temperatures. This paper presents a comparative analysis of the crack length "a" as a function of a crack-opening-displacement "δ" obtained by experimental and numerical method. The tests were performed under ambient temperature for CT type specimens made of Ti6Al4V titanium alloy. Numerical research was carried out by finite element method using ABAQUS software. Satisfactory results were obtained which gave the reasons for establishing a hybrid methods for the crack length determination.

Nonlinear aspects of “breathing” crack-disturbed plate waves: 3-D analytical modeling with experimental validation

“…When the crack grows to a certain degree, the maximum stress intensity reaches the fracture threshold, and the crack commences to deteriorate rapidly following a fracture mechanism rather than a fatigue mechanism [40,41]. As a result, most part of the crack behaves as a linear scatterer which prevents the probing GUW from traversing the crack, leading to reduced intensity of CAN and therefore decreasing NI, as observed in Fig.…”

Crack initiation and growth analysis in explosively welded AA2519–AA1050–Ti6Al4V layered material in ambient and cryogenic conditions

“…Its efficiency was verified through comparison of the calculation results with the results of optical measurement and through FEA analysis. 31…”

Influence of the theoretical load point on the value of the J - JQ integral during determination of fracture toughness of 2519 aluminium alloy

“…The method of operation software was presented in figure 3. Detailed information about the system operation can be found in the article [6]. It should be noted that the crack opening displacement was carried out by placing a CT sample extensometer in the lock, as shown in figure 2.…”