Inelastic failure of fully clamped beams and circular plates under impact loading

Abstract An experimental investigation is reported on the impact loading of fully clamped mild steel beams and circular plates struck by relatively heavy masses. The impact energies are sufficient in some tests to cause material failure and, thus, to provide the threshold conditions for cracking and severance for impact velocities up to 6.74m/s for beams and 15.66m/s for plates. The beams were struck at several locations across the span, and a significant reduction in the threshold energy is observed for strikes near to a support. Round-nosed impactors require more energy to induce failures than flat-nosed ones. Furthermore, they cause failure to develop at the supports of both beams and plates rather than initiating rupture at the impact point, which is the case for a blunt striker. Reasonable agreement is obtained between the predictions of an elementary theory, which uses rigid-plastic methods of analysis, and the experimental results for the deflection and failure of beams struck at the mid-span. The experimental data, which include static and dynamic material properties, are suitable for calibrating numerical schemes and for further study on the accuracy of criteria for the dynamic inelastic failure of structures.

[1]  Peter Hartley,et al.  Fracture Initiation in Plane Strain Forging , 1985 .

[2]  S. Clift,et al.  Fracture prediction in plastic deformation processes , 1990 .

[3]  M. D. Olson,et al.  Deformation and rupture of blast loaded square plates—predictions and experiments , 1993 .

[4]  Norman Jones,et al.  Dynamic Inelastic Failure of Structures. , 1997 .

[5]  William James Stronge,et al.  Blunt missile perforation of thin plates and shells by discing , 1988 .

[6]  G. Nurick,et al.  The deformation and tearing of thin circular plates subjected to impulsive loads , 1990 .

[7]  Norman Jones,et al.  On the criteria for cracking and rupture of ductile plates under impact loading , 2000 .

[8]  G. Nurick,et al.  Tearing of blast loaded plates with clamped boundary conditions , 1996 .

[9]  S. B. Menkes,et al.  Broken beams , 1973 .

[10]  G. Nurick,et al.  The deformation and tearing of thin square plates subjected to impulsive loads—An experimental study , 1996 .

[11]  Norman Jones,et al.  Numerical simulation of a clamped beam under impact loading , 1989 .

[12]  N. Jones.  Plastic Failure of Ductile Beams Loaded Dynamically , 1976 .

[13]  Norman Jones,et al.  Numerical simulation of impact loaded steel beams and the failure criteria , 1997 .

[14]  Yu Jilin,et al.  Further experimental investigations on the failure of clamped beams under impact loads , 1991 .

[15]  Tongxi Yu,et al.  A further study of plastic shear failure of impulsively loaded clamped beams , 2000 .

[16]  S. Bodner,et al.  Experiments on viscoplastic response of circular plates to impulsive loading , 1979 .

[17]  Norman Jones,et al.  Measurement of Impact Loads using a Laser Doppler Velocimeter , 1990 .

[18]  N. Jones,et al.  Dynamic response and failure of fully clamped circular plates under impulsive loading , 1993 .

[19]  Norman Jones,et al.  Dynamic response of a rigid plastic clamped beam struck by a mass at any point on the span , 1988 .

[20]  N. Jones,et al.  Experimental investigation of clamped beams struck transversely by a mass , 1987 .