Load Bearing Capacity of a Dented Aluminum Pipe Subjected to Internal Pressure Considering the Effect of Ductile Damage

Abstract

In this paper, the effect of ductile damage on the behavior of a dented Aluminum pipe subjected to internal pressure is investigated. The plastic behavior of pipes under indentation is studied using continuum damage mechanics theory and the elastic-plastic finite element analysis. Finite element calculations are carried out using the damage plasticity model proposed by Xue and Wierzbicki. The proposed damage plasticity model incorporates effects of both hydrostatic stress and the Lode angle to define the fracture envelope. Numerical calculations for different ranges of internal pressures and indenter diameters with and without damage effect are carried out and results are compared. It is shown that damage has a significant effect on the load bearing capacity of an indented pipe. Results of the present study confirm the credibility of the proposed model in predicting the ductile fracture under multi-axial state of stress loadings.

Numerical and experimental investigation of dynamic tube hydroforming to examine the prediction on it by genetic programming

“…Finite element analysis facilitates testing different combinations of input factors (i.e. process conditions and design parameters) at a low cost (Akbari Alashti et al, 2015 andLiu et al, 2019). Afshar et al (2017), in a research, predicted the result of the hydroforming process by the finite element model for bulge forming of a straight tube and verified with published experimental data and the adaptive simulation technique that what they studied is based on the ability to detect the onset and growth of defects (e.g.…”

“…Finite element analysis facilitates testing different combinations of input factors (i.e. process conditions and design parameters) at a low cost (Akbari Alashti et al. , 2015 and Liu et al.…”

Fatigue Tests on Buried or Repaired Dented Steel Pipeline Specimens

“…6 Test pressure range of the preliminary in-air test (6.0 MPa) was different from the pressure range of the actual cyclic test (7.0 MPa). 7 The results of DIC for the hot spot after burying or repairing were extrapolated based on the relationship between the results obtained for FBSG in each of the studied conditions. 8 The crack was detected with 4270 cycles, but the specimen leaked with 6500 cycles.…”

“…The fatigue behavior of pipeline specimens with dents under cyclic internal pressure loading, with and without restriction constraints to free deformation, have been studied by different researchers (e.g., see [1][2][3][4][5][6][7][8][9]). Although dent depth criteria are the most frequently used in the industry for their ease of application, the determination of cyclic strains operating on the dent hot spots are needed to enhance the accuracy of fatigue life predictions.…”