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Investigation of fracture forming limits of dual phase steel under warm incremental forming process
https://orcid.org/http://orcid.org/0000-0001-8712-5786
Dual phase (DP) steel is extensively used in automotive industries for making outer body structures due to its high strength-to-weight ratio. During forming operation, it exhibits low formability at room temperature (RT). To overcome this issue, the present work is mainly focused on warm incremental forming of DP steel at 400 °C. The fracture forming limits of DP steel have been investigated experimentally at 400 °C and validated it with various phenomenological-based damage models. Firstly, the varying wall angle conical (VWACF) and pyramidal (VWAPF) frustums are formed experimentally to evaluate the fracture forming limits. It is found that the height of the conical frustums has increased by 15.06%, whereas the pyramidal frustum has shown a 7.5% improvement compared to forming at RT. Also, the fracture limits of the material have improved by 14.06%. The triaxiality ratio of VWAPF is considerably more than VWACF which indicates the early failure of the VWAPF. Furthermore, the various phenomenological-based damage models namely; Oyane (Oy), Cockroft–Latham (C–L), Mc-Clintock (Mc-C), Brozz (Br), and Ko (Ko) have been formulated for the theoretical prediction of fracture limiting strains. The prediction capability of these models is assessed based on the correlation coefficient (R), Squared Euclidean Distance (SED), and Average Absolute Error (AAE). The prediction capability of Oy’s model shows best agreement with the highest value of R as 0.9957, the least SED, and AAE as 0.0275, 2.77% respectively. Additionally, the experimental findings are supported by microstructural examination using the EBSD technique.
Investigation of fracture forming limits of dual phase steel under warm incremental forming process
https://orcid.org/http://orcid.org/0000-0001-8712-5786
Dual phase (DP) steel is extensively used in automotive industries for making outer body structures due to its high strength-to-weight ratio. During forming operation, it exhibits low formability at room temperature (RT). To overcome this issue, the present work is mainly focused on warm incremental forming of DP steel at 400 °C. The fracture forming limits of DP steel have been investigated experimentally at 400 °C and validated it with various phenomenological-based damage models. Firstly, the varying wall angle conical (VWACF) and pyramidal (VWAPF) frustums are formed experimentally to evaluate the fracture forming limits. It is found that the height of the conical frustums has increased by 15.06%, whereas the pyramidal frustum has shown a 7.5% improvement compared to forming at RT. Also, the fracture limits of the material have improved by 14.06%. The triaxiality ratio of VWAPF is considerably more than VWACF which indicates the early failure of the VWAPF. Furthermore, the various phenomenological-based damage models namely; Oyane (Oy), Cockroft–Latham (C–L), Mc-Clintock (Mc-C), Brozz (Br), and Ko (Ko) have been formulated for the theoretical prediction of fracture limiting strains. The prediction capability of these models is assessed based on the correlation coefficient (R), Squared Euclidean Distance (SED), and Average Absolute Error (AAE). The prediction capability of Oy’s model shows best agreement with the highest value of R as 0.9957, the least SED, and AAE as 0.0275, 2.77% respectively. Additionally, the experimental findings are supported by microstructural examination using the EBSD technique.
Investigation of fracture forming limits of dual phase steel under warm incremental forming process
https://orcid.org/http://orcid.org/0000-0001-8712-5786
Dual phase (DP) steel is extensively used in automotive industries for making outer body structures due to its high strength-to-weight ratio. During forming operation, it exhibits low formability at room temperature (RT). To overcome this issue, the present work is mainly focused on warm incremental forming of DP steel at 400 °C. The fracture forming limits of DP steel have been investigated experimentally at 400 °C and validated it with various phenomenological-based damage models. Firstly, the varying wall angle conical (VWACF) and pyramidal (VWAPF) frustums are formed experimentally to evaluate the fracture forming limits. It is found that the height of the conical frustums has increased by 15.06%, whereas the pyramidal frustum has shown a 7.5% improvement compared to forming at RT. Also, the fracture limits of the material have improved by 14.06%. The triaxiality ratio of VWAPF is considerably more than VWACF which indicates the early failure of the VWAPF. Furthermore, the various phenomenological-based damage models namely; Oyane (Oy), Cockroft–Latham (C–L), Mc-Clintock (Mc-C), Brozz (Br), and Ko (Ko) have been formulated for the theoretical prediction of fracture limiting strains. The prediction capability of these models is assessed based on the correlation coefficient (R), Squared Euclidean Distance (SED), and Average Absolute Error (AAE). The prediction capability of Oy’s model shows best agreement with the highest value of R as 0.9957, the least SED, and AAE as 0.0275, 2.77% respectively. Additionally, the experimental findings are supported by microstructural examination using the EBSD technique.
Investigation of fracture forming limits of dual phase steel under warm incremental forming process
Int J Interact Des Manuf
Pandre, Sandeep (author) / Kotkunde, Nitin (author) / Suresh, Kurra (author) / Singh, Swadesh Kumar (author)
2024-05-01
12 pages
Article (Journal)
Electronic Resource
English
Investigation of fracture forming limits of dual phase steel under warm incremental forming process
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