Identification of the elasto-viscoplasticparameters for a thermoplastic polymer byinstrumented indentation

Lucas Breder Teixeira, Eric Blond, Thomas Sayet, Jean Gillibert-. To cite

Zeng and Chiu’s weighting scheme as described in section 1.4 is firstly used in an attempt to describe the indentation-unloading curve (in fact, the upper 50% of the unloading

The experimen- tal tests show that the material mechanical properties of fused silica and PMMA can be computed with precision at penetration depths between 25 and 100 nm, which is

which corresponds to the first contact of the indenter with the material, a hold time is applied to the maximum load, a period unloading which allows to determine the Young's modulus

A finite element analysis was carried out to simulate the mechanical behaviour of polymers which can be defined by the Young's modulus E and the parameters (K and n)

For problems with Dirichlet or Neumann boundary conditions described by variational equalities, the application of the adjoint state method leads to a linear adjoint problem

The identi®cation problem is considered as a constrained minimization problem and the gradient is computed using the adjoint state method, in spite of the diculties of the

Pour illustrer ce propos, nous reviendrons sur le déroulé des séances proposées avec L. Pour rappel, lors de la première séance nous proposions à L. de réaliser la