Abstract
A model calibration technique is considered for the estimation of material parameters in free-standing thin foils. The experimental apparatus is inspired by bursting strength testers for paper, textile fabrics and polymer coatings such as geo-membranes. The procedure referred to herein consists of the following phases. A controlled fluid pressure is applied to the foil specimen placed on an horizontal plane with a suitably shaped hole. The induced out-of-plane displacements are measured by a laser profilometer. The material parameters are then inferred from these measurements through inverse analysis, by simulation of the test and minimisation of a suitable norm which defines the discrepancy between measured and computed displacements. Potentialities and limitations of the proposed method are assessed on the basis of computer-generated “pseudo-experimental” data, where modelling errors are ruled out. The identifiability of some industrially meaningful material parameters is established.
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