ISSN: 1945-7545
CODEN: GTJODJ
Published Online: 2 September 2010
Page Count: 13

New Method of Full-Field Stress Analysis and Measurement Using Photoelasticity

Dijkstra, Jelke
Ir., Geo-Engineering Section, Delft Univ. of Technology, Delft,

Broere, Wout
Ir., Geo-Engineering Section, Delft Univ. of Technology, Delft,

(Received 31 July 2009; accepted 28 July 2010)

Abstract

Photoelastic measurements provide a means to obtain a meaningful representation of the stress state in a granular material over the full area of a plane-strain sample without the need to place stress transducers inside the sample. This method uses the property of non-crystalline materials to become optically anisotropic when put under stress. To measure the resultant relative retardation of a light beam transmitted through a model built from glass grains and a liquid with a matching refractive index in the pores, a full-field polariscope has been built. This setup is able to characterize the stress state in the full-field of the sample with only seven intensity measurements. A plane-strain pile penetration test is used as an example.

Keywords:
photoelasticity, full-field stress measurements, physical model test, pile installation

Paper ID: GTJ102672
DOI: 10.1520/GTJ102672
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