Analysis of displacement and strain field around a bimaterial interfacial region by stress couple theory and experiment

Abstract

This paper is concerned with the determination of displacement and strain fields within the interfacial region of a bimaterial specimen under shear loading. The analysis is based on the couple stress theory. The measurements are made by means of phase shift moiré interferometry which has been recognized as a useful measuring method by combining moiré interferometry with the phase shift technique and image processing. The results obtained by phase shift moiré interferometry show that the distribution of the shear strain, rotation angle and rotation gradient at the interface region are changing rapidly. The results show good agreement with those predicted by stress couple theory.

Mode III interfacial crack in the presence of couple-stress elastic materials

“…In the particular case of η − = −1 and η + = −1, the governing equation (11) and the traction-free crack face conditions (12) for the material in the lower half-plane are satisfied by the classical solution defined by the field equation…”

“…In order to provide an experimental basis for studying the interfacial behaviour of a bimaterial specimen under shear loading, Kang et al (2002) applied a method which combines moiré interferometry with phase shift and image processing to measuring the interfacial displacement and strain fields within the interfacial region. Their experimental results show that there is a boundary layer characteristic with a peak value of shear strain and high gradient of rotation angle in the interfacial region.…”

Evaluation of dynamic fracture toughness of a bonded bi-material interface subject to high-strain-rate shearing using digital image correlation

“…Illustration of shear deformation on a bi-material interface with stress wave propagation Numerous studies, including many analytical studies, have investigated fracture parameters of bimaterial interfaces for many years [6]- [8]. The fracture parameters [9,10], the effects of elastic and plastic properties [11,12], and displacement and strain fields within the interfacial region [13] have also been analyzed. A recent concern arising from these investigations is regarding mixed-mode fracture parameters for dissimilar interfaces in thin layers [14]- [17].…”

A new interfacial imperfection coupling model (IICM) and its effect on the facture behavior of a layered multiferroic composite: Anti-plane case

“…In this case, the threephase model as shown in Fig. 1(b) should be adopted, and the interfacial region is regarded as a new separate constituent of the composite (Delale and Erdogan, 1988;Kang et al, 2002;Wang et al, 2004).…”