アルミニウム合金防撓パネルの座屈・塑性崩壊挙動と圧壊強度推定法に関する研究

概要

論文の詳細を見る
Aluminum alloy is characterized by the high strain-hardening rate relative to Young's modulus and round stress-strain relationship above elastic limit. The reduction of strength (softening) in heat affected zone of welded aluminum structures is also one of characteristics of aluminum alloy. In addition, the shaped stiffened plates with a taper cross-section at the joint line between plate and stiffener are widely used in aluminum ship structures. In this paper, the influences of the strain-hardening rate, stress-strain relationship, welding residual stress, reduced strength in heat affected zone and taper cross-section on the buckling/plastic collapse behaviour of aluminum stiffened plates are investigated performing FEM analyses. The simplified method to estimate the ultimate strength of aluminum stiffened plates is developed considering observed influences. It has been found that: (1) The stress-strain relationship between elastic limit and 0.2% proof stress significantly affects the ultimate strength of aluminum stiffened plates. However, that above 0.2% proof stress only slightly affects the ultimate strength. (2) Softening increases the buckling strength of welded stiffened plates because of the reduction of compressive welding residual stress, which is in equilibrium with reduced tensile residual stress in heat affected zone. (3) The ultimate strength of the shaped stiffened plates with taper part is almost the same as that with the uniform plate having equivalent thickness. (4) The influence of butt welding on the ultimate strength of shaped stiffened plates is small because of the presence of the tensile residual stress in the middle part of the plate. (5) The proposed simplified method can estimate the ultimate strength witch is in good agreement with the results of FEM and experiments.
2001-08-31

アルミニウム合金防撓パネルの座屈・塑性崩壊挙動と圧壊強度推定法に関する研究

スポンサーリンク

概要

著者

関連論文

スポンサーリンク