Stress Concentration Factors for Oblique Holes in Pressurized Thick-Walled Cylinders

Abstract

Elastic stress concentration factors (SCFs) for internally pressurized thick cylindrical vessels with oblique circular crossholes are reported. Results of finite-element analyses for two wall ratios (k equal to 2.25 and 4.5) and a range of crosshole ratios (d from 0.1 to 0.5) show that SCFs sharply increase with the inclination α of the crosshole axis. These findings are consistent with earlier empirical design guidelines based on experimental investigations.

Cross bore size and wall thickness effects on elastic pressurised thick cylinders

“…In general, the cross bore size ratios of 0.1 gave the lowest hoop stress, while the highest stress occurred in 1.0. A similar occurrence had been reported by other previous studies Hearn (1999) and Nihous et al (2008). Usually, large cross bores entail excessive removal of materials in the cylinder, and as a result, only little material is left to bear the applied load.…”

“…Seven cylinders with various wall thickness ratios and cross bore sizes were studied. The wall thickness ratio of the cylinders (K) was selected to coincide with those discussed in the reviewed literature by Makulsawatudom et al (2004), Masu (1989Masu ( , 1991, and Nihous, Kinoshita, and Masutani (2008). These included K values of 1.4, 1.5, 1.75, 2.0, 2.25, 2.5 and 3.0.…”

Numerical investigation of spatial aspects of soil structure interaction for secant pile wall circular shafts

“…Laczek et al [16] performed elasto-plastic analysis of stress-strain state in the vicinity of a hole in a thick walled cylindrical pressure vessel using the finite element method. Nihous et al [25] studied elastic stress concentration factors for internally pressurized thick walled cylinders with oblique circular cross holes using the finite element method considering various wall cross-hole ratios. Li et al [17] employed inelastic FE analyses to study the effect of autofrettage on the stress levels in thick walled cylinders with a radial cross-hole.…”

Elastic Strength of High Pressure Vessels with a Radial Circular Cross Bore

“…This consequently may reduce the pressure carrying capacity of the pressure vessel by up to 60 % [12] when compared to a plain vessel without cross bores. Approximately, 24.4% of the total number of accidents in industrial processes is due to failures associated with pressure vessels [13]. These failures are catastrophic have led to loss of human life, damage of property, displacements of persons and environmental pollutions [13].…”