Multiscale digital image identification of heterogeneous elastic properties of softwoods

Abstract

Abstract. Multi-scale modelling of materials is now widely spread as it allows for a comprehensive analysis of their behaviour. The idea of this paper is to propose a methodology that couples Digital Images Correlation with multi-scale numerical simulations in order to identify a material behaviour that is too complex to obtain at the observation scale but that can be described in a simpler way at a finer scale. For this purpose, a Mechanical Image Correlation approach is proposed that involves a multi-scale numerical model. The capabilities of the proposed method is illustrated based on an example dedicated to the identification of heterogeneous orthotropic elastic properties of softwood.

Towards a better understanding of wood cell wall characterisation with contact resonance atomic force microscopy

“…The mechanical properties at the cell wall level can be estimated using numerical computations of the properties of its constituents or, as is more usual and traditionally done, the estimations can be carried out experimentally on chemical compounds extracted from the cell walls [3]. Other measurements consist of ''classical'' tensile tests at the scale of the tree rings or tissue using back-calculations [11] and/or specific strain field measurements [12,13]. See Gamstedt et al [14] for an extensive review on the use of mixed experimental-numerical methods to characterise wood properties that are not easily available by direct measurements.…”

Towards Material Testing 2.0. A review of test design for identification of constitutive parameters from full‐field measurements

“…This was the starting point of many developments covering various materials and types of constitutive equations. Examples dealing with biological materials, [18,19] metals, [20‐25] MEMS, [26] composites, [27‐30] heterogeneous [31] and homogeneous [32] hyperelastic materials, wood, [33] and even crimped mineral wool, [34] can be found in the literature. Note finally that when DIC is the measuring technique, it is possible to merge the two steps involved in the procedure described above, namely, measuring the displacement field on the one hand, and then applying FEMU on the other hand.…”