自動車用高張力鋼板の溶接継手の衝撃引張り特性に及ぼす予疲労の影響
| Autor: | Hidetoshi Kobayashi, Masashi Daimaruya, Hiroshi Tsuda |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
sheet specimen
Materials science Mechanical Engineering split hopkinson bar Metallurgy technology industry and agriculture Split-Hopkinson pressure bar Welding respiratory system Strain rate Condensed Matter Physics law.invention Stress (mechanics) Mechanics of Materials law 501.32 Ultimate tensile strength pre-fatigue Butt joint Fracture (geology) welded butt joint General Materials Science impact tensile strength Composite material Tensile testing |
| Zdroj: | Journal of the Society of Materials Science, Japan. 54:734-740 |
| ISSN: | 1880-7488 0514-5163 |
| DOI: | 10.2472/jsms.54.734 |
| Popis: | In this research, the effect of pre-fatigue on the impact tensile properties of the welded butt joint of high strength steel plates, HR590 and HR780, was investigated by means of the split Hopkinson bar method for tensile test. For comparison, quasi-static tensile tests were also performed to examine the effect of strain rate on the strength and the elongation. It was found that the effect of pre-fatigue on the tensile strength of welded butt joints is quite small if the applied stress in the pre-fatigue is less than the apparent yield stress of the welded butt joints. In the results of quasistatic and impact tensile tests for the welded butt joint of HR780 steel, however, the fracture strain of the specimens subjected to high cycle pre-fatigue was larger than that of the virgin specimens. This may be caused by the increase in hardness due to pre-fatigue observed in the weld zone of the joints. |
| Databáze: | OpenAIRE |
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