Finite Element Analysis of Dynamic Fracture Behaviour of Drill Pipe Under Various Impact Loads

Abstract

In this paper, finite element analysis is conducted to study dynamic responses of a defected drill pipe (DP) under impact loading encountered in working conditions. Longitudinal impact loading such as tensile, eccentric compressive and torsional impact loading and transverse collision loading are considered. A finite element model is firstly developed and validated, and then employed to evaluate the effects of various impact loading on dynamic responses of the defected DP. It is found that the inertial effect due to tensile impact is the most prominent among all the longitudinal impact loadings. In addition, the effect of the transverse collision between the DP and the borehole wall on the driving force of the crack is evaluated. It is concluded that the dynamic effects of the various impact loading frequently exerting on the DP should be taken into consideration for life prediction of DPs. DOI: http://dx.doi.org/10.5755/j01.mech.24.4.19503

Parametric finite element analysis of laminated coupling

“…9 In 2021, Zhao et al also took the friction factor between the laminations into the stress analysis of the laminated coupling and obtained the influence of the friction factor on the stress of the membranes. 10 In the development process of the laminated coupling, many researchers have also carried out a large number of experiments, including Li and others conducted the membrane torsional stiffness experiment 11 and Song conducted a study on the mechanical properties of the 5MW wind turbine coupling and verified it through experiments. 12 In order to show that this analytical method can be expanded to more complex coupling scenarios, Wasti and Utku compares the shear stress results from the finite element calculations of the stacked sheet set with earlier analytical results.…”

“…Li et al studied the stiffness characteristics of the flange elastic waist‐type laminated membrane coupling 9 . In 2021, Zhao et al also took the friction factor between the laminations into the stress analysis of the laminated coupling and obtained the influence of the friction factor on the stress of the membranes 10 . In the development process of the laminated coupling, many researchers have also carried out a large number of experiments, including Li and others conducted the membrane torsional stiffness experiment 11 and Song conducted a study on the mechanical properties of the 5MW wind turbine coupling and verified it through experiments 12 .…”