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Experimental study of strain fields during shearing of medium and high-strength steel sheet
Dalarna University, Falun.
Dalarna University, Falun.
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0001-7074-8960
Rekke forfattare: 32016 (engelsk)Inngår i: International Journal of Mechanical and Materials Engineering, ISSN 1823-0334, Vol. 11, nr 1, artikkel-id 14Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Background

There is a shortage of experimentally determined strains during sheet metal shearing. These kinds of data are a requisite to validate shearing models and to simulate the shearing process.

Methods

In this work, strain fields were continuously measured during shearing of a medium and a high strength steel sheet, using digital image correlation. Preliminary studies based on finite element simulations, suggested that the effective surface strains are a good approximation of the bulk strains below the surface. The experiments were performed in a symmetric set-up with large stiffness and stable tool clearances, using various combinations of tool clearance and clamping configuration. Due to large deformations, strains were measured from images captured in a series of steps from shearing start to final fracture. Both the Cauchy and Hencky strain measures were considered, but the difference between these were found negligible with the number of increments used (about 20 to 50). Force-displacement curves were also determined for the various experimental conditions.

Results

The measured strain fields displayed a thin band of large strain between the tool edges. Shearing with two clamps resulted in a symmetric strain band whereas there was an extended area with large strains around the tool at the unclamped side when shearing with one clamp. Furthermore, one or two cracks were visible on most of the samples close to the tool edges well before final fracture.

Conclusions

The fracture strain was larger for the medium strength material compared with the high-strength material and increased with increasing clearance.

sted, utgiver, år, opplag, sider
2016. Vol. 11, nr 1, artikkel-id 14
HSV kategori
Forskningsprogram
Hållfasthetslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-61215DOI: 10.1186/s40712-016-0067-xISI: 000390267600001OAI: oai:DiVA.org:ltu-61215DiVA, id: diva2:1059007
Merknad

Validerad; 2017; Nivå 2; 2016-12-22(andbra)

Tilgjengelig fra: 2016-12-22 Laget: 2016-12-22 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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