Development and optimization of a formable sandwich sheet
type: Dataset
description: This thesis investigates the mechanical behavior of a new type of formable all-metal bi-directionally corrugated sandwich sheet material. Unlike conventional flat sandwich panel materials, this type of sandwich sheet material can be formed into three-dimensional shapes using traditional sheet metal forming techniques. In a first step, the core structure geometry is optimized such as to offer the highest shear stiffness-to-weight ratio. The post yielding behavior of the "optimal" sandwich structure is investigated using finite elements simulations of multi-axial experiments. A phenomenological constitutive model is proposed using an associative flow rule and distortional hardening. An inverse procedure is outlined to describe the sandwich material model parameter identification based on uniaxial tension and four-point bending experiments. In addition, simulations of a draw bending experiment are performed using a detailed finite element model as a well as a computationally-efficient composite shell element model. Good agreement of both simulations is observed for different forming tool geometries which is seen as a partial validation of the proposed constitutive model.
landing page: https://pastel.hal.science/tel-00691246
keyword: constitutive-modeling
keyword: elements-finis
keyword: finite-element
keyword: formabilite
keyword: formability
keyword: infoeu-reposemanticsdoctoralthesis
keyword: modelisation-constitutive
keyword: numerical-optimization
keyword: optimisation-numerique
keyword: physmecamsmecaphysics-physicsmechanics-physicsmaterials-and-structures-in-mechanics-physi
keyword: plasticite
keyword: plasticity
keyword: sandwich-structure
keyword: spimecamsmecaengineering-sciences-physicsmechanics-physicsmed-phmaterials-and-structures
keyword: structure-sandwich
keyword: theses
issued: 2026-05-20T19:54:00.707178
modified: 2026-05-20T19:54:00.707184
language: en
contact point: Organization
  fn: CCSD

test_moissonnage_selune
type: Agent

Development and optimization of a formable sandwich sheet
type: Distribution
format: HTML
access URL: https://pastel.hal.science/tel-00691246
issued: 2026-05-20T19:54:00.828791
modified: 2026-05-20T19:54:00.659629