Study of Pre-strain Effect on Bendability in Three-Point Bending Test

Shahzamanian, M. M.; Partovi, Amir; Wu, Peidong

doi:10.1007/978-981-15-9893-7_18

Cited by 1 publication

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“…The GTN model as an improvement of the original Gurson model [25] considers void nucleation and coalescence that lead to fracture. The effect of pre-strain on bendability has been studied by Shahzamanian et al [26] using the GTN model and it was observed that the pre-strain decreases the fracture strain in sheet metals under bending. Schowtjak et al [27] used a machine learning approach to predict the void volume fraction in the GTN model for sheet metals under bending.…”

Section: Introductionmentioning

confidence: 99%

Study of Influence of Width to Thickness Ratio in Sheet Metals on Bendability under Ambient and Superimposed Hydrostatic Pressure

Shahzamanian

Lloyd²,

Partovi

et al. 2021

Applied Mechanics

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The effect of the width to thickness ratio on the bendability of sheet metal is investigated using the finite element method (FEM) employing the Gurson–Tvergaard–Needleman (GTN) model. Strain path changes in the sheet with change in the width/thickness ratio. It is shown that bendability and fracture strain increase significantly by decrease in the width/thickness ratio. The stress state is almost uniaxial when the stress ratio (α) is close to zero for narrow sheets. Stress ratio is nothing but the major stress to minor stress ratio. This delays the growth and coalescence of micro-voids as the volumetric strain and stress triaxiality (pressure/effective stress) decrease. On the other hand, ductility decreases with increase in α for wider sheets. Fracture bending strain is calculated and, as expected, it increases with decrease in the width/thickness ratio. Furthermore, a brief study is performed to understand the effect of superimposed hydrostatic pressure on fracture strain for various sheet metals with different width/thickness ratios. It is found that the superimposed hydrostatic pressure increases the ductility, and that the effect of the width/thickness ratio in metals on ductility is as significant as the effect of superimposed hydrostatic pressure. Numerical results are found to be in good agreement with experimental observations.

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Section: Introductionmentioning

confidence: 99%