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Application of two fracture models in impact simulations

Fras T., Roth C. C., Mohr D.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2020

Vol. 68, nr 2

317--325

The following discussion concerns modelling of fracture in steel plates during an impact test, in which both target and striker are manufactured from the same material, high-strength high-hardness armour steel – Mars® 300. The test conditions (3 mm thick targets, projectiles with different nose shapes at impact velocity lower than 400 m/s) result in severely damaged components, which results in an analysis of stress states showing material failure. Numerical analyses are performed using two material models: the Johnson-Cook approach, as traditionally used in impact simulations, accounting for the effect of stress triaxiality, strain rate and temperature and for comparison, a simulation by means of the stress triaxiality and Lode angle parameter-dependent Hosford-Coulomb model, also incorporating the effect of the strain rate on a fracture initiation. The aim of the study is to analyse the mechanisms of penetration and perforation observed in the armour steel plates and validation of the modelling approaches.

Wybrane aspekty obróbki wiórowej stali pancernych

Czechowski K., Wronska I.

Obróbka Metalu

2014

nr 4

30--34

W atykule przedstawiono przykłady stali pancernych. Omówiono zagadnienia obróbki wiórowej wyrobów ze stali pancernych. Przedstawiono przykładowe parametry skrawania dla obróbki wierceniem, pogłębianiem, gwintowaniem i frezowaniem stali pancernych.

Examples of armour stells are presented. Machining of products from armour steels is considered. Examples of machining parameters for turning and milling of armour steels are given.