A method of determining the dynamic fracture toughness of steels. Report 1

Krasovskii, A. Ya.; Krasiko, V. N.; Оrynyak, І. V.; Naumov, A. V.

doi:10.1007/bf01523290

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1998

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“…For this method, the accuracy of calculated DSIF values depends mainly on the level of complexity of the specimen model used. Known specimen models have one [10], two [11,12], several [13] or theoretically infinite (in the case of beam [14][15][16][17] or 2D [17,18] models) numbers of degrees of freedom. Evidently the mathematical efforts needed to obtain the solution of corresponding problems grow with increasing model complexity.…”

Section: Introductionmentioning

confidence: 99%

Modal Approach for Processing One‐ and Three‐point Bend Test Data for Dsif‐time Diagram Determination Part I—theory

Rokach

1998

Fatigue Fract Eng Mat Struct

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A hybrid experimental/numerical method for the determination of the variation in the dynamic stress intensity factor (DSIF) with time during one‐ or three‐point bend impact tests is presented. According to the concept of hybrid methods, a DSIF–time diagram is calculated for a particular mathematical model for the specimen using experimentally registered loading as the model excitation. The simple expression for the impact DSIF–response function is derived for an arbitrary linear model of the specimen, using the modal superposition method. Finally, formulae for DSIF calculations for different types of loading approximation are derived.

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