Strain rate effects in similitude modelling of plastic deformation of structures subject to impact loading.
Srivastava AK; Rehkugler GE
Trans ASAE 1976 Jan; 19(4):617-621
The effects of distortion in the strain rate during impact loading was studied in relation to the determination of a prediction factor for the similitude modelling of plastic deformation of structures, such as roll over protection structures. The relationship between the increase in the rate of strain and the resultant increase in the yield stress was described according to the model of Perrone. Dimensional strain analysis utilized the variables for a system consisting of a cantilever beam struck by a pendulum, and the experimental design involved determination of the permanent plastic and maximum instantaneous deflections produced on a variety of test beams following the application of impact force from compound pendulums of different lengths and weights. The effects of the height of the beam, the thickness of the beam, the distance of impact point to pivot point, the size of the semicylindrical impact piece, the mass of the impact pendulum, the modulus of elasticity, the static yield stress, strain rate parameters, the impact velocity, the angle of impact, the acceleration due to gravity, and time on beam deflection were described and applied to a theoretical analysis of strain rate effects.
NIOSH-Publication; NIOSH-Grant; Grants-other; Equipment-design; Safety-engineering; Agricultural-industry; Safety-equipment; Mechanical-properties
Agricultural Engineering Cornell University 204 Riley-Robb Hall Ithaca, N Y 14850
Other Occupational Concerns; Grants-other
Transactions of the American Society of Agricultural Engineers
Cornell University Ithaca, Ithaca, New York