Instability phenomena during the conical expansion of circular cylindrical shells

Daxner, T.; Rammerstorfer, F.G.; Fischer, Franz Dieter

doi:10.1016/j.cma.2004.07.047

Cited by 58 publications

(18 citation statements)

References 5 publications

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“…Similar forms of material instabilities under tensile stresses may arise in metal forming of thin plates or shells if certain "forming limits" are surpassed. For instance, the formation of periodically arranged necks (localized plastic deformations) during the conical expansion of a thin circular cylindrical shell (similar to flaring of a tube [4]) represents a bifurcation from the trivial, i.e. axisymmetric deformation process.…”

Section: Introductionmentioning

confidence: 99%

Buckling of elastic structures under tensile loads

Rammerstorfer

2017

Acta Mech

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Typically, structures fail due to buckling if loaded by compression. However, it is important to notice that-especially in lightweight structures-there are several situations in which instabilities, such as buckling or wrinkling, can be observed under tensile loads. In the present paper, a number of problems, dealing with buckling under tensile loads, are presented. Some solutions already contained in former papers of the author are reconsidered, compared to recent results, and extended. Further new results are presented. Bifurcation buckling under tensile loading of beams, plates (with and without cut-outs), rolled metal strips, thin cell walls of metal foams, and of thin metallic films on polymer substrates is treated in this paper. It is made clear that in all cases of buckling under tensile loads eventually compressive stresses are responsible for the loss of stability. Thus, one should carefully differentiate between "buckling under tension" and "buckling under tensile loads". Nonconservative loads as well as material instabilities under tension, such as necking, are not considered in this paper.

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Section: Introductionmentioning

confidence: 99%

Buckling of elastic structures under tensile loads

Rammerstorfer

2017

Acta Mech

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“…Alternatively, in the case of flaring, multiple necks are observed in the circumference of the tubeend [23]. Last but not least, due to the morphology of the tube flaring process, where the tubeend is formed into a cone shape, each ring of the cone, i.e., frustum is less strained than the adjacent one in the direction of the tube-end.…”

Section: Accepted Manuscript N O T C O P Y E D I T E Dmentioning

confidence: 97%

“…Some of the analytical models to analyze the thin walled tubes, friction, contact zone, and tool angle are described in [3,[22][23][24]. Diffuse necking and loss of global stability during flaring were simulated and validated with experiments in [23].…”

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confidence: 99%

Formability Enhancement in Titanium Tube-Flaring by Manipulating the Deformation Path

Nikhare

Korkolis

Kinsey

2015

Journal of Manufacturing Science and Engineering

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The tube flaring process has been traditionally used to expand one end of a tube without changing its cross-sectional area. This simple process typically forms the product using a single punch. To delay failure and enhance formability, a two-step flaring process can be used. For example, if a significant elliptical flared shape is attempted in a one-step process, a necking/tearing failure would occur on the major axis of the ellipse. However, if a two-step process, starting with a mildly elliptical punch and followed by the final, sharply elliptical punch is used instead, the desired elliptical shape can be achieved. In this paper the effects of the punch geometry of the first step on the deformation paths are numerically analyzed. By manipulating the deformation path, failure can be delayed so that higher formability is achieved. The numerical model is validated by comparison with experimental results.

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“…They developed a mathematical model to determine the stress and strain fields as well as the drawing force for conical expansion of thin walled tubes under compression. In the same context, Daxner et al (2005) studied numerically and experimentally the buckling behavior of circular cylindrical shells due to flaring. The study revealed that buckling is the dominant instability mode for long tubes while short tubes are mainly affected by necking and rupture failure.…”

Section: Introductionmentioning

confidence: 98%