Influence of stress path change on the resistance to plastic deformation of cold rolled sheets
2005 (English)In: Journal of University of Science and Technology Beijing, ISSN 1005-8850, Vol. 12, no 6, 521-526 p.Article in journal (Refereed) Published
Flat workpieces have been tested in order to investigate the influence of stress path change (loading mode) while keeping strain path unchanged. These investigations are pertinent to the testing of cold rolled strips and to subsequent forming. The workpieces which first compressed by plane strain compression in thickness direction were then tested in perpendicular direction in order to measure the influence of strain and stress path. The tension workpieces came from flat die compression test at different deformation histories. Two different materials were investigated: 18/8 Ti stainless steel and AW-1050 aluminium. The results show that the plastic flow by tension in lengthwise direction after pre-strain by compression in thickness direction will begin at an appreciably lower stress than that of the workpieces unloaded after pre-compression. Comparing with two materials, it can be seen that both 18/8 Ti stainless steel and AW-1050 aluminium behave similarly. The drop in yield stress is lower for AW-1050 aluminium than that for 18/8 Ti stainless steel. However, reloading in different directions than in the precious step results in significantly higher strain hardening.
Place, publisher, year, edition, pages
2005. Vol. 12, no 6, 521-526 p.
cold working, plastic deformation, strain path, stress path, loading mode, flow stress, yield stress, strain hardening
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-37897ISI: 000234352100009ScopusID: 2-s2.0-32344446647OAI: oai:DiVA.org:kth-37897DiVA: diva2:435560
QC 201108192011-08-192011-08-192011-08-19Bibliographically approved