落重試験による構造要素の衝撃強度評価 : 弾性域の応答と限界

概要

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A small and short impulsive load yields relatively small deformation and large stress on structural elements, but large and long one does large deformation. Then a sharp impulsive load may cause brittle fracture or fatigue on such structural parts as subjected to high stress concentration, and a large impulsive load also brings about ductile fracture or collapse. The response of structural elements to an impulsive load can be obtained by the dynamic analysis of continuous model or spring-mass approximation. The recent progress of computer makes possible to calculate dynamic response of actual structures. However, impact tests are important to obtain impulsive load and structural response in actual structures. In this paper, simply supported T-section beams, clampped square plates and restricted stiffened plates were tested by using drop weight testing apparatus. The characteristics of impulsive load measured on long size impact bars used as the drop weight, deflection and strain of specimens were ascertained. Based on the test results and the elastic calculation using beam and plate/shell Finite Element Methods, simple methods with impact energy and impulse were proposed to estimate the impulsive load and deflection of structural elements.
社団法人日本船舶海洋工学会の論文