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KMID : 0371819960280060583
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Nuclear Engineering and Technology
1996 Volume.28 No. 6 p.583 ~ p.593
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A Characteristic Analysis on the Elastic Stiffness of the Tapered-width Lef Type Hoddown Spring Assembly Designed in KOFA's Design Space
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Kee-Nam Song and Keum-Seok Seo
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Abstract
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An elastic stiffness formula of a leaf type holddown spring(HDS) assembly with a uniformly tapered width from w_0 to w₁ over the length, has been analytically derived based on Euler beam theory and Castigliano`s theorem. Elastic stiffnesses of the tapered-width leaf type HDSs(TW-HDSs) designed in the same dimensional design spaces as the KOFA HDSs have been evaluated from the derived formula, in addition, a parametric study or the elastic stiffness of the TW-HDSs has been carried out. Analysis results show that, as the effects of axial and shear force on the elastic stiffness of the TW-HDSs have been 0.15∼0.21% of the elastic stiffness, most of the elastic stiffness is attributed to the bending moment, and that elastic stiffnesses of the TW-HDSs have been about 32∼33% higher than those of the KOFA HDSs. It is found that the number of leaves composing a HDS assembly could be lessened by one under the conditions that the TW-HDSs have been adopted in KOFA.
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KEYWORD
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