Investigations on Influence of Geometric Parameters in Drawing of Perforated Sheet Metals

Venkatachalam, G.; Nishanth, J.; Mukesh, M.; Kumar, D. Sreekanth

doi:10.4028/www.scientific.net/amm.852.229

Cited by 1 publication

(1 citation statement)

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“…Venkatachalam et al estimated the FLCs of aluminum plates with regularly arranged round 16 and square 1,16 holes using the FEM and investigated the effects of open area, ligament ratio, and hole size on the forming-limit strains. The same research group also predicted the FLCs of perforated steel sheets with round 17 and square 18 holes. However, plastic instability criteria, which must have been used to determine the forming-limit strains, cannot be found in their publications.…”

Section: Introductionmentioning

confidence: 99%

Forming-limit strains of perforated steel sheets under biaxial stress state

Chiba

Nakamura

Suga

2019

Proceedings of the Institution of Mechanical Engineers, Part L:

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The forming-limit strains of cold-rolled steel sheets perforated with regularly arranged round-, square-, and cross-shaped holes were experimentally and theoretically estimated. Two types of hole arrangements, i.e. square and triangular patterns, were considered for each hole shape and the experimental forming-limit strains were determined using the hemispherical dome test (also known as Nakazima test). The theoretical forming-limit curves were computed using the finite element method with Hill's quadratic yield function and a plastic instability criterion determined from the external force power. By comparing the experimental results and theoretical calculations under proportional loading, the formability prediction performance of the theoretical approach was evaluated. It was found that although the approach is not applicable for the triangular array of cross-shaped holes, it can achieve partially acceptable prediction for the other cases.

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