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  4. Fracture mechanics at elevated loading rates in the ductile to brittle transition region
 
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2017
Conference Paper
Title

Fracture mechanics at elevated loading rates in the ductile to brittle transition region

Abstract
The rate-dependent reference temperature T0,x characterizes the fracture toughness of ferritic steels at the onset of cleavage. Fracture toughness values KJc,d were determined according to the Annex A1 of ASTM E1921 [1] which refers to the high rate annexes A14 and A17 of ASTM E1820 [2]. Results of extensive dynamic fracture toughness experiments at various loading rates, temperatures, specimen types and sizes revealed shortcomings in the transferability of the shape of the Master Curve under quasi-static conditions to elevated loading rates. In particular, the quasi-static Master Curve predicts lower fracture toughness values towards higher temperatures than experimentally observed under dynamic loading causing a steeper Master Curve shape. Fractographic examinations proved the relevan ce of local crack arrest under dynamic loading conditions, which is consistent with the view of the parallelism of dynamic fracture probability and probability of arrest.
Author(s)
Mayer, U.
University of Stuttgart, Stuttgart, Germany
Reichert, T.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Tlatlik, J.
Fraunhofer-Institut für Werkstoffmechanik IWM  
Mainwork
ASME Pressure Vessels and Piping Conference 2017. Proceedings. Vol.6: Materials and fabrication. Tl.A  
Conference
Pressure Vessels and Piping Conference (PVP) 2017  
DOI
10.1115/PVP2017-65358
Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • brittleness

  • fracture mechanic

  • fracture toughness

  • temperature

  • probability

  • shape

  • ASTM International

  • dynamic testing (materials)

  • fracture (Materials)

  • fractography

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