• Steel and Composite Structures
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• 제31권2호
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• pp.187-199
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• 2019

This paper presents the semi-analytical development of the dynamic instability behavior and the dynamic response of functionally graded (FG) cylindrical shallow shell panel subjected to different type of periodic axial compression. First, in prebuckling analysis, the stresses distribution within the panels are determined for respective loading type and these stresses are used to study the dynamic instability behavior and the dynamic response. The prebuckling stresses within the shell panel are the same as applied in-plane edge loading for the case of uniform and linearly varying loadings. However, this is not true for the case of parabolic loadings. The parabolic edge loading produces all the stresses (${\sigma}_{xx}$, ${\sigma}_{yy}$ and ${\tau}_{xy}$) within the FG cylindrical panel. These stresses are evaluated by minimizing the membrane energy via Ritz method. Using these stresses the partial differential equations of FG cylindrical panel are formulated by applying Hamilton's principal assuming higher order shear deformation theory (HSDT) and von-$K{\acute{a}}rm{\acute{a}}n$ non-linearity. The non-linear governing partial differential equations are converted into a set of Mathieu-Hill equations via Galerkin's method. Bolotin method is adopted to trace the boundaries of instability regions. The linear and non-linear dynamic responses in stable and unstable region are plotted to know the characteristics of instability regions of FG cylindrical panel. Moreover, the non-linear frequency-amplitude responses are obtained using Incremental Harmonic Balance (IHB) method.

• 한국강구조학회 논문집
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• 제10권3호통권36호
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• pp.407-421
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• 1998

본 논문에서는 박판구조물의 좌굴모드 및 좌굴응력값을 구하기 위해서 spline finite strip method를 이용하여 박판구조물이 흔히 좌굴을 일으키기 전에 다양한 초기부정형으로 인하여 발생할 수 있는 전좌굴변형 및 비선형 응력-변형률 관계를 포함한 비선형 비탄성 좌굴해석프로그램을 개발하였다. 이 방법은 다양한 지점조건과 임의의 하중조건을 가지는 박판구조물에 적용이 가능하며, 초기부정형과 잔류응력을 포함하고 있는 다양한 형태의 박판구조물의 비선형 좌굴거동을 보다 정확하게 예측할 수가 있었다.