TY - GEN
T1 - Prediction and analysis of fracture in single point incremental forming using a damage based material model
AU - Malhotra, Rajiv
AU - Xue, Liang
AU - Cao, Jian
AU - Belytschko, Ted
AU - Smith, K. Scott
AU - Ziegert, John
PY - 2011
Y1 - 2011
N2 - Incremental forming is a sheet metal forming process that has envisioned considerable interest in the research community due to greater formability, economical and product independent tooling and greater process flexibility. However, lack of the ability to predict fracture has considerably hindered its industrial adoption. This work uses finite element analysis with a damage based material model to predict fracture in Single Point Incremental Forming (SPIF). The fracture envelope is described in the stress space and is a function of both the hydrostatic pressure and the deviatoric stress state. The tool forces and fracture depths from simulations and those from experiments are found to agree with each other well. An in-depth analysis of the deformation is performed to show that the through-the-thickness shear affects the formability much more significantly than the hydrostatic pressure. Furthermore, the implications of this effect on increasing formability in SPIF are discussed.
AB - Incremental forming is a sheet metal forming process that has envisioned considerable interest in the research community due to greater formability, economical and product independent tooling and greater process flexibility. However, lack of the ability to predict fracture has considerably hindered its industrial adoption. This work uses finite element analysis with a damage based material model to predict fracture in Single Point Incremental Forming (SPIF). The fracture envelope is described in the stress space and is a function of both the hydrostatic pressure and the deviatoric stress state. The tool forces and fracture depths from simulations and those from experiments are found to agree with each other well. An in-depth analysis of the deformation is performed to show that the through-the-thickness shear affects the formability much more significantly than the hydrostatic pressure. Furthermore, the implications of this effect on increasing formability in SPIF are discussed.
KW - Damage plasticity model
KW - Fracture
KW - Hydrostatic pressure
KW - Single point incremental forming (SPIF)
KW - Through-the-thickness-shear
UR - http://www.scopus.com/inward/record.url?scp=80455141711&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:80455141711
SN - 9781618390578
T3 - Transactions of the North American Manufacturing Research Institution of SME
SP - 11
EP - 20
BT - 39th North American Manufacturing Research Conference 2011 - Transactions of the North American Manufacturing Research Institution of SME
T2 - 39th Annual North American Manufacturing Research Conference, NAMRC39
Y2 - 13 June 2011 through 17 June 2011
ER -