Thermal buckling of thin sheet related to cold rolling: Latent flatness defects modeling

Dinh Cuong Tran (1) , Nicolas Tardif (2) , Hamza El Khaloui (2) , Ali Limam (1)

1 LGCIE - Laboratoire de Génie Civil et d'Ingénierie Environnementale
2 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]

In cold rolling of thin sheet metal, the interstand tension has a role to mitigate the wrinkling of the plate due to residual stress. When this mechanical loading is reduced up to full unloading, it can induce or increase elastic wave buckling, leading to latent flatness defects. An experimental work is proposed to study the relation between residual stresses, global tensile stresses and buckling for wavy edge flatness defects during the mechanical unloading. Residual stresses are generated by thermal loading. The wrinkling shape and thermal field are measured by optical full-field measurements. Finite Element simulation using a combination of a non-linear algorithm and a bifurcation analysis that take into account mid-surface imperfections can follow the wrinkling behavior.

Mots clés: Thermal buckling; Rolling; Unloading; Latent flatness defect; Residual stress; Experiments; Modeling

Domaines: Mécanique des structures [physics.class-ph]; Thermique [physics.class-ph]; Mécanique des solides [physics.class-ph]

Dinh Cuong Tran, Nicolas Tardif, Hamza El Khaloui, Ali Limam. Thermal buckling of thin sheet related to cold rolling: Latent flatness defects modeling. Thin-Walled Structures, 2017, 113, pp.129-135. ⟨10.1016/j.tws.2016.12.010⟩. ⟨hal-01802236v2⟩