Robert J. Sanford

TL;DR: In this article, a non-linear equation is developed which relates the stress field in terms of KI, KII, and σox to the co-ordinates, r and θ, defining the location of a point on an isochromatic fringe of order N.

TL;DR: In this paper, the authors present a comprehensive overview of brittle fracture mechanics and their application in the design of fracture-tolerant materials.Most chapters include an Introduction, Summary, References and Exercises.

TL;DR: This paper developed expressions for the strains in a valid region removed from the crack tip, and indicated procedures for locating and orienting the gages to accurately determine KI from one or more strain-gage readings.

TL;DR: In this article, the linear and nonlinear least squares methods are developed in matrix notation as solution schemes to determine key parameters from whole-field fringe patterns, such as the photoelastic-fringe constant from a disk in diametric compression and the opening-mode geometric stress-intensity factor from the loop in the neighborhood of a crack tip.