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首页> 美国政府科技报告 >Bruchmechanische, Statistische und Fraktographische Untersuchungen AM Stahl 20 Mnmoni 55 im Duktil-Sproeden Uebergangsbereich (Fracture-Mechanical, Statistics and Fractographic Investigations on the Steel 20 Mnmoni 55 in the Ducti
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Bruchmechanische, Statistische und Fraktographische Untersuchungen AM Stahl 20 Mnmoni 55 im Duktil-Sproeden Uebergangsbereich (Fracture-Mechanical, Statistics and Fractographic Investigations on the Steel 20 Mnmoni 55 in the Ducti

机译：Bruchmechanische，statistische und Fraktographische Untersuchungen am stahl 20 mnmoni 55 im Duktil-sproeden Uebergangsbereich（断裂 - 机械，统计和断面研究钢20 mnmoni 55 in Ducti

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摘要

The influence of the component and crack geometry on the fracture-mechanical characteristics of ferritic steels and on their scattering, was investigated using steel 20MnMoNi55. The present status of statistical models is reviewed. The origin of fracture was determined for almost all test specimens on the brittle fracture surface. A connection between J-integral and fissure of the brittle fracture surface was found. The initiation of the brittle fracture was described by the weakest-link model: the proceeding stable crack growth can be described by a extended model. The weakest-link model does not predict the scattering among the specimens. Results with bend specimen with semi-elliptical surface crack indicate that the weakest-link model can also be used for this crack geometry.

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