Experimental measurement of temperature-dependent equivalent stress-strain curves of a 420 MPa structural steel with axisymmetric notched tensile specimens
| Autor: | Jianying He, Shengwen Tu, Xiaobo Ren, Zhiliang Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Strain (chemistry) Bridgman correction Large strain General Engineering Rotational symmetry 020101 civil engineering 02 engineering and technology Equivalent stress-strain curve 0201 civil engineering Equivalent stress 020303 mechanical engineering & transports 0203 mechanical engineering Ultimate tensile strength Notch geometry Fracture (geology) Low temperature General Materials Science Axisymmetric notched tensile specimen Composite material Necking Extensometer |
| Zdroj: | Engineering Failure Analysis |
| Popis: | Recently, the authors in this paper proposed a correction function to determine material's equivalent stress-strain curve with axisymmetric-notched tensile specimens. In this study, tensile tests were performed at room temperature, −30 °C and − 60 °C with axisymmetric notched tensile specimens to verify this method and to identify the equivalent stress-strain curves of a 420 MPa structural steel. A high-speed camera was used together with the so-called edge-tracing method to calculate average true strain. The material's equivalent stress-strain curve was also measured with extensometer and smooth round bar specimens. Experimental results show that equivalent stress-strain curve of this structural steel is sensitive to test temperature. Equivalent stress-stress curves obtained from axisymmetric notched tensile specimens by using the proposed correction function show good agreement with those from extensometer before diffuse necking and from Bridgman correction at large strain using smooth tensile specimens. Since fracture strain strongly depends on the notch geometry, it is recommended to use axisymmetric notched tensile specimens with smaller a0/R0 when applying the proposed correction function to measure material's equivalent stress-strain curve. |
| Databáze: | OpenAIRE |
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