Proposal of a new estimation method of thermal ratchetting behavior of fast breeder reactor components

Wada, Hiroshi; Ueta, Masahiro; Ichimiya, Masashi; Ueno, Toshio; Hirayama, Hiroshi; Takahashi, Shigeru

doi:10.1016/0029-5493(94)00927-q

Cited by 1 publication

(1 citation statement)

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“…If the liquid changes its temperature, its change in density results in a change of the position of this surface. The ratcheting behavior of thin-walled cylindrical shells was investigated as a result of stationary or moving axial temperature gradients with and without additional axial force by many researchers (Abdel-Karim 2005;Angiolini et al 2016;Igari et al 1993Igari et al , 2000Igari et al , 2002Karadeniz and Ponter 1984;Karadeniz et al 1987;Kobayashi and Ohno 1996;Kobayashi et al 1998;Lee 2002, 2004;Lee et al 2003Lee et al , 2004Ohno et al 1998;Okajima (2016); Ponter and Carter 1989;Wada et al 1993Wada et al , 1995Watanabe et al 2008). In the case of a moving axial temperature gradient, the travel distance plays an important role.…”

Section: Cylindrical Shell Under Moving Axial Temperature Gradientmentioning

confidence: 99%

Ratcheting caused by moving loads

Hübel

Vollrath

2017

Int J Adv Struct Eng

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Progressive deformation (ratcheting) can occur as a response to variable loads as soon as the elastic limit is exceeded. If this is the case, strains and displacements accumulate in the event of cyclic loading in each load cycle. Widely known as triggers for ratcheting and already being considered in some design codes are configurations, in which a structure is subjected to at least two different types of load, namely a constant load (the primary load) and a superimposed cyclic load. In this paper, another mechanism that generates ratcheting is introduced. It can be attributed solely to the effect of a single load. In the simplest case, this can be explained by the successive activation of (an infinite number of) plastic hinges if a load of constant magnitude is moved in space. The increments of strains and displacements can decrease or increase from cycle to cycle, when the material is hardening, or if elastic foundation is present, or if the equilibrium condition is formulated for the deformed system (second-order theory) or if ''large'' rotations are taken into account (third-order theory).

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