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Registration Number

0220U101671, 0118U004770 , R & D reports

Title

Development of a methodics of an yield stress determination at wide range of high strain rate deformation to increase mine resistance of protective construction elements

Head

Shyrokov Andrii V.,

Registration Date

18-02-2020

Organization

G.S. Pisarenko Institute for Problems of Strength of the National Academy of Sciences of Ukraine

Description

 It is developed a methodology which gives an opportunity to define dynamic yield stress of high-strength steels and recommendations use of this methodology is created. It was received for the first time experimental data on yield stress for high-strength steels Swebor 450 and Swebor 500 at high strain rate in the range of 103 - 105 s-1. It is shown that the dynamic yield stress is 1.8 times higher than static one. An experimental investigation of impactors penetration of barrier from Swebor 450 was fulfilled and a velocity of the impactors after penetration was determine. It is shown that taking into account the strain rate at numerical modeling allows to increase reliability of the final velocity impactor prediction. Evaluation of impact resistance of structural elements was carried out on the example of welded joints of high-strength steels by determination of impact viscosity of different areas of thermal influence zone.

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