Proposal of notch strengthening threshold criterion for ductile cast iron and relationship between notch strengthening threshold and mechanical property

Zhou, Hong (2018) Proposal of notch strengthening threshold criterion for ductile cast iron and relationship between notch strengthening threshold and mechanical property. Favourable review or citation

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Abstract or Summary

In this study, the notch strength was studied for the wide range of testing speed and temperature in comparison with the static tensile strength at room temperature. High speed tensile tests were conducted for conventional ferrite-pearlite ductile cast iron at stroke speed of 0.0085 ~ 270 mm/s (strain rate of 0.00021 ~ 18 /s), and at -180 ~ 22°C. Then, the notch strength and static tensile strength at room temperature were compared in terms of the strain rate-temperature parameter R, which is known to be useful for evaluating the combined influence of strain rate and temperature. This study focuses on the notch strengthening threshold R ≧ Rth where the notch strength is larger than the static tensile strength and therefore notched components can be used safely. In other words, if R ≧ Rth, the static tensile strength at room temperature can be used to evaluate notched components in mechanical design to prevent the instantaneous fracture. In this study, it was found that the Rth value can be predicted from the static tensile property and Brinell hardness. Since the conventional ferrite-pearlite ductile cast iron considered in this paper has a broad range of mechanical properties, the present approach and discussion can be applied to evaluating other materials under various temperature and strain rate.

Item Type:Favourable review or citation
Keywords that describe the item:Engineering
Subjects:T Technology > T Technology (General)
Divisions:Schools > Centre for Engineering and Industrial Design
ID Code:5978
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Deposited On:12 Sep 2018 20:53
Last Modified:23 Nov 2018 01:55

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