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buckling load
Based on the results of the tests and literature, the formula of the buckling load of composite pipes under axially compressive load was presented based on Perry formula.
      
Analysis modeling for plate buckling load of vibration test
      
Thus, there has been a tendency in the construction field to derive a precise buckling load analysis model of member in order to establish accurate safety factors.
      
A numerical analysis model, using modal analysis to acquire the dynamic function calculated by dynamic parameter to get the buckling load of member, is proposed in this paper.
      
The analysis results indicated that this proposed method only needs to apply modal parameters of 7×7 test points to obtain a theoretical value of buckling load.
      
The average critical buckling load of 186.56 kN was obtained by using the Patran finite element analysis (FEA).
      
The test method is applied to a buckling load maximization problem of a laminated composite plate; its effectiveness is confirmed by example.
      
The new method is applied to a stacking sequence optimization problem of a composite plate with hat-type stiffeners for maximizations of buckling load.
      
The intron method is attempted for the optimizations of laminated cylinders to maximize the buckling load and minimize the number of plies.
      
The fractal branch and bound method was developed by the authors for optimization of stacking sequences to maximize buckling load of composite structures.
      
Approximation of the objective function with quadratic polynomials was confirmed for buckling load maximizations and flutter speed limit maximizations using lamination parameters as predictors.
      
In the present study, flutter speed maximization with a constraint of buckling load is employed as an example of stacking sequence optimization by means of the fractal branch and bound method with a strength constraint.
      
When a debonded area only was located at the edge of the flange, no notable reduction of compressive buckling load was found until the size of the debonding reached a half wavelength of the buckling mode.
      
The compressive buckling load dropped significantly when multiple delaminations, which were small in comparison to the half wavelength of the buckling mode, accompanied the skin-flange debonding.
      
The extended method is applied for obtaining two optimal stacking sequences for the maximization of the buckling load of a hat-stiffened composite panel.
      
The critical buckling load resulting from a stability analysis has been evaluated, based on Dirichlet-Lagrange criterion.
      
The results show that the pile is more unstable when the bury-depth ratio and stiffness ratio of soil to pile increase, and although the buckling load increases with the stiffness of soil, the pile may ruin for its brittleness.
      
These equations are solved numerically to obtain both the elastica and the buckling load of the columns.
      
The Runge-Kutta method is used to integrate the differential equations, and the Regula-Falsi method is used to obtain the unknown initial value of the elastica and the buckling load, respectively.
      
Likewise, the parametric studies of the effects of shear deformation on post-buckling behavior and buckling load, e.g., shear coefficient, the slenderness ratio, and the section ratio, are reported.
      
 

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