Correlation of Test and FEA Results for the Nonlinear Behavior of Straight Pipes and Elbows

Abstract

This paper summarizes the literature on reconciliation of finite element analyses with in-plane bending experiments on piping elbows. It then describes in detail two four-point-bending tests on straight pipes and two in-plane bending tests on elbows and the corresponding nonlinear finite element analyses. Using a new procedure for obtaining a stress-strain curve for stainless steel using only values for E,Sy, and Su and a representative stress-strain curve from a test on a similar material specimen, the nonlinear responses of the piping components tested are shown to be simulated more accurately than previously published results.

Validation on large scale tests of a new hardening–softening law for the Barcelona plastic damage model

“…Under extreme loading conditions, such as the high repeated incursions in the nonlinear zone that the imposed displacement in this case causes, elbows exhibit two different failure modes. These are either significant cross-sectional ovalization or local buckling, as reported by the experimental work described in Sobel and Newman [23], [24], Dhalla [25] and Greenstreet [26], Tan et al [27], Shalaby and Younan [28] and Suzuki and Nasu [29] for monotonic bending moments and Yahiaoui et al [30], Slagis [31] and Fujiwaka et al [32] for cyclic loading, and from the work of Karamanos et al [33], [34], Pappa et al [35], Varelis et al [36], [37].…”

Using XFEM to Predict the Damage with Temperature of the Steel Pipe Elbows under Bending and Pressure loading

“…Several researchers such as Greenstreet [13], Hilsenkopf, Suzuki and Nasu [14] experimentally tested elbows with different dimensions under different loading modes and compared their results by numerical methods. Others like Tan et al [15] recently studied the bending and opening flexion of an elbow and compared it with finite element analysis results. Shalaby and Younan [16] analyzed 90 degrees steel elbows for a wide range of diameter / thickness ratios under in-plane bending moment in opening and closing with internal pressure.…”

Investigation on the Bending Ratcheting Behavior of Pressurized Z2CND18.12N Stainless Steel Elbows

“…Elbow components that are widely used in nuclear plants and chemical industries may be subjected to various combinations of internal pressure, bending and twisting cyclic loading. A few studies in the literature addressed for the elbow behavior under in-plane bending and internal pressure [1,2].Ratcheting of pressurized elbows was generally experimented with shaking table and inertia load [3], and the strains were usually monitored by the mechanical or hydraulic actuator [4]. Moreover, ratcheting strains were also analyzed by Elasto-Plastic Finite Element Analysis (EPFEA) with elastic perfect plasticity (EPP) model.Nowadays, a few studies addressed the simulation of piping components under cyclic bending and internal pressure [2].…”