INCUBATION TIME CONCEPT IN PROBLEMS OF PULSED STRENGTH OF CONTINUA:FRACTURE,CAVITATION,AND ELECTRICAL BREAKDOWN
作者单位：St.-Petersburg State UniversityNIIMMUniversitetsky Prospect28PetrodvoretsSt.-Petersburg199178Russia
会议名称：《祝贺郑哲敏先生八十华诞应用力学报告会》
会议日期：2004年
学科分类：08[工学] 080102[工学-固体力学] 0801[工学-力学（可授工学、理学学位）]
关 键 词：pulsed strength incubation time spalling fracture cavitation in fluids electrical breakdown
摘 要：Experiments on the dynamic fracture of solids,hquids,conductors,andinsulators that is caused by fast intense actions of environment or directed energy fluxesreveal a number of effects indicating a fundamental difference between the fast dynamicrupture(breakdown)of materials and a similar process under slow quasistatic *** example,one of the basic problems in testing the dynamic-strength properties of ma-terials is associated with the dependence of the limiting characteristics on the duration,amplitude,and growth rate of an external action,as well as on a number of other *** a critical value is a constant for a material in the static case,experimentallydetermined critical characteristics in dynamics are strongly unstable,and as a result,their behavior becomes *** indicated(and some other)features of thebehavior of materials subjected to pulsed actions are common for a number of seeminglyquite different paysical processes,such as dynamic fracture(starting cracks and scab-bing),cavitation in liquids,and electrical breakdown in *** this paper,we analyzeexamples illustrating typical dynamic effects inherent in these *** propose aunified interpretation for the fracture of solids and liquids and electrical breakdown ininsulators using the structural-time approach[1,2]based on the concept of the fractureincubation time.