Numerical modeling and analysis for forming process of dual-phase 980 steel exposed to infrared local heating

A recent experiment confirmed that the infrared (IR) local heating method drastically reduces springback of dual-phase (DP) 980 sheets. In the experiment, only the plastic deformation zone of the sheets was locally heated using condensed IR heating. The heated sheets were then deformed by V-bending or 2D-draw bending. Although the experimental observation proved the merit of using the IR local heating to reduce springback, numerical modeling has not been reported. Numerical modeling has been required to predict springback and improve the understanding of the forming process. This paper presents a numerical modeling for V-bending and 2D-draw bending of DP 980 sheets exposed to the IR local heating with the finite element method (FEM). For describing the thermo-mechanical behavior of the DP 980 sheet, a flow stress model which includes a function of temperature and effective plastic strain was newly implemented into Euler-backward stress integration method. The numerical analysis shows that the IR local heating reduces the level of stress in the deformation zone, although it heats only the limited areas, and then it reduces the springback. The simulation also provides a support that the local heating method has an advantage of shape accuracy over the method to heat the material as a whole in V-bending. The simulated results of the springback in both V-bending and 2D-draw bending also show good predictions.

Measurement of the relative branching ratio of B-s(0) -> J/psi f(0)(980) to B-s(0) -> J/psi phi

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Upconversion luminescence in Er3+ doped and Er3+/Yb3+ codoped zirconia and hafnia nanocrystals excited at 980 nm

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Stokes and anti-Stokes luminescence of Er3+ doped Ga10Ge25S65 glass excited at 980 and 532 nm

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Efeito dos solutos urêmicos sobre espécies reativas de oxigênio em sistemas-modelo in vitro

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

White light generation in Tm3+/Ho3+/Yb3+ doped PbO-GeO2 glasses excited at 980 nm

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Robert Marret papers - Accession 980

The Robert Marett Papers are a valuable resource for researchers, as well as surveyors, in researching the growth and development of the various communities in which he worked. Bob Marett’s work, which includes survey plats (as well as copies of plats from previous surveyors), maps, architectural drawings, field notes, correspondence, copies of deeds, and appointment ledgers are available for researchers and surveyors to peruse. The collection consists of 40, 000 pieces and 124 bound volumes that span from the late 1800s to 1992. The Inventory itself consists of 313 pages and individual plats are searchable by Property Owner as well as by the Date of the Survey.