Global buckling

DNA a global buckle and bend required in the packaging of DNA around the histone, or other protein scaffolds. 

Global buckling. Can occur in the absence of delamination just due to the local reduction in flexural stiffness. 

Notch effect Local buckling Global buckling Global/local Buckling... 

Barbero, E. and Tomblin, J. (1994) A phenomenological design equation for FRP columns with interaction between local and global buckling. Thin-WaUed Struct., 18, 117-131. 

Rackliffe, M.E., Jensen, D.W., and Lucas, W.K. (2(X)6) Local and global buckling of ultra-lightweight IsoTruss stmctures. Composites Science and Technology, 66 (2), 283-288. 

Global buckling of a member is considered with the assumption that the material is isotropic and that the relevant elastic modulus is that in the weak axis of the member. 

The member response, as controlled by plastic rotational strength and deformation characteristics (including local and global buckling)... 

Here, E is the elastic modulus of the material, S is the wall thickness of the mast, and D is its outer diameter. Global buckling will not take place if ... 

Here, I is the second moment of area and L is the length of the component. Assuming that an eccentricity ( exists between the load and component axes at the beginning of loading, the condition to avoid both yielding and global buckling can be shown to be ... 

Donsi, E Ferrari, G. Maresca, R, High-pressure homogenization for food sanitization. In Global Issues in Food Science and Technology, Barhosa-Canovas, G. V. Mortimer, A. Linehack, D. Spiess, W. Buckle, K., (Eds.) Academic Press, Burlington, MA, 2009. 

Figure 1.2 Mixed global and local buckling of a laminate after a moderate velocity impact.

The effects of global (Euler) and local buckling dominate the design of compression members in any material. This is particularly so when designing FRP compression members. The inherent relatively low elastic modulus of FRP requires a full consideration of all possible modes of buckling. 

In composites, Drzal and Madhukar (1993) observed that the failure mode depended on the level of fiber/matrix adhesion at low levels, the mechanism was global delamination buckling at intermediate levels, fiber microbuckling at high levels fiber compressive (shear) failure. This is illustrated in Fig. 27. 

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