Experimentally determined full-field stress, strain and displacement analyses of perforated finite members.

摘要

The integrity assessment of an engineering structure or member often requires knowledge of the full-field individual components of stress, strain and/or displacement. Evaluating these can be difficult for finite structures, contact problems, or if the material properties, loading or boundary conditions are unknown. Theoretical stress analyses of finite perforated geometries are virtually impossible. Both analytical and numerical techniques necessitate knowing the boundary conditions, the latter often being unavailable in practice. Results show errors can occur as one approaches a purely boundary collocation approach. Combining experimental information with analytical and numerical tools enables one to solve aforementioned situations. For example, values of a single component of displacement are used here to determine full-field individual components of stress, strain and displacements in isotropic or orthotropic structures and without explicitly differentiating the measured displacements. Discretely located single-element strain gages are used to determine full-field individual components of stress, strain and displacement in a perforated finite tensile plate and a diametrally-loaded ring. Thermoelastic stress analysis is combined with an Airy's stress function (in real polar coordinates) to stress analyze a mechanical joint, a concentrated-loaded plate, and members containing an elliptical or multiple circular hole(s). The displacements and strains at the interface of a loaded bimetallic disk are determined.