Effect of Pulse Shape on Spall Strength
V. I. Smirnov1, Yu. V. Petrov2
1Emperor Alexander I St. Petersburg State Transport University, St. Petersburg, 198103, Russia
2Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, St. Petersburg, 199178, Russia
Keywords: откол, инкубационное время, структурно-временной критерий, пороговый силовой импульс, импульсная емкость разрушения, spall, incubation time, structure-time criterion, threshold power pulse, pulse fracture capacity
Abstract
This paper analyzes the effect of the time-dependent shape of a load pulse on the spall strength of materials. Within the framework of a classical one-dimensional scheme, triangular pulses with sections of signal increment and attenuation and without sections of signal increment are considered. Calculation results for the threshold characteristics of fracture for rail steel are given. The possibility of optimization of fracture by selecting a loading time with the use of an introduced characteristic of dynamic strength (pulse fracture capacity) is demonstrated. The study is carried out using a structure-time fracture criterion
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