Effect of a Dent of Different Sizes and Angles of Inclination on Buckling Strength of a Short Stainless Steel Cylindrical Shell Subjected to Uniform Axial Compression

Abstract

Generally, thin cylindrical shells are susceptible for geometrical imperfections like non-circularity, non-cylindricity, dents, swellings etc. All these geometrical imperfections decrease the static buckling strength of thin cylindrical shells, but in this paper only effect of a dent on strength of a short (L / D ∼1 and R/t = 280) stainless steel cylindrical shell is considered for analysis. The dent is modeled on the FE surface of perfect cylindrical shell for different angles of inclination and sizes at half the height of cylindrical shell. The cylindrical shells with a dent are analyzed using non-linear static buckling analysis. From the results it is found that in case of shorter dents, size and angle of inclination dents do not have much effect on static buckling strength of thin cylindrical shells, where as in the case of long dents, size and angle of inclination of dents have significant effect. But both short and long dents reduce the static buckling strength drastically.

Alumínium palackok nyakazási lépéseinek és stabilitásvesztésének modellezési sajátosságai

“…Vékony falú hengeres testek stabilitásvesztéséről számos tanulmányban olvashatunk. A munkák jelentős része részletesen foglalkozik a stabilitásvesztést befolyásoló tényezőkkel, közöttük is az egyik legjelentősebbel, a geometriai imperfekció hatásával hengeres héjak esetén [2][3][4][5][6][7]. Ezen cikkek (főként rozsdamentes acélból készült) hengeres testek horpadásaiból és egyéb gyártási hibáiból származó alakhibák, illetve azok méretének és elhelyezkedésének hatásával foglalkoznak egyszerű geometriájú szerkezeti elemek stabilitásvesztése során.…”

Parametric study on buckling behaviour of thin stainless steel cylindrical shells for circular dent dimensional variations under uniform axial compression

“…Schneider (2006) discussed about the effect of local axisymmetric concave and convex axisymmetric ring shaped imperfection patterns on buckling strength of cylindrical shell under axial compression and one of the conclusion was that as width of imperfection increases buckling strength increases whereas as depth of imperfection increases buckling strength decreases. Prabu et al (2007) carried out parametric study about the effect of dent dimensions and its orientations on the buckling strength of short stainless steel cylindrical shells under uniform axial compressive force load condition and it was concluded that circumferential dents have more dominant effect than longitudinal dents in reducing the buckling strength of cylindrical shells. Prabu et al (2009) studied about the nearness effect of two circumferential short dents on buckling strength of cylindrical shell by modeling two short dents at half the height of the perfect cylindrical shell model with varying the centre distance between the dents.…”

Experimental and Numerical Investigations on the Stability of Cylindrical Shells

“…Regarding the buckling behaviour of cans, the finite element method seems to be the most efficient way to tackle the issue. Articles [7][8][9] detail the circumstances of buckling and the effect of multiple parameters on its occurance and behaviour. Probably the most important circumstance is the presence of geometrical imperfections.…”