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《Acta Mechanica Sinica》 1983-05
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DYNAMIC PLASTIC BUCKLING OF CYLINDRICAL SHELL UNDER AXIAL IMPACT-AN EXPERIMENTAL STUDY

Wang Ben Han Mingbao Huang Zhuping Yang Qingchun(Peking University)  
The paper gives the results of an experimental study on three sets of AM aluminum alloy cylindrical shells under axial impact. The length of the shell is 100 mm. Three different thicknesses 1.00mm, 1.42mm. and 2.00mm. are used, and the shell is fixed on a jig and struck by a moving mass M (54gm.). The influence of different impact velocities on buckling behavior is discussed (see Pig. 2 and photograghs 1, 2). It is found that when the impact velocity is less than a certain critical value Vc1, eq. (4), the shell will only exhibit uniform plastic deformation in both the axial and radial directions and does not produce sinusoidal waves. Vc1 is the critical velocity usually discussed in the literature, when this velocity is exceeded, the shell buckles. When the impact velocity exceeds another critical value Vc2. the shell will further change from the axisymmetric mode into a non-uniform type of large deformation. The shell shortens greatly and it begins to lose its load carrying capacity. We believe that this second critical velocity is also quite important in the study of dynamic plastic buckling characteristics. An approximate theoretical formula for estimating Vc2 based on strain rate reversal (violation of eq. 5) is given by eq. (7).
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