Application of the Digital Moiré Technique with Circular and Radial Gratings in Fracture Analysis of Rubber-like Materials
A new digital moire method is proposed to analyze the displacement distributions near the crack tip of rubber-like materials. With circular and radial gratings, the distributions of in-plane displacement are measured directly. The principle of forming digital moire and experimental method are described in detail. An application is carried out to measure the mechanical field of a cracked rubber sheet under plane stress condition using delicate digital moire technique. The radial and circular displacement distributions in the polar coordinate system are obtained. The displacement isolines distributions near the crack tip are discussed. Finally, the distribution rules to mechanical fields near the crack tip are discussed with the sector division method.
Systematic reflection on practice remains a vexed issue for many nurses and the context of a busy hospital environment poses a challenge. As a process to meet this challenge, Grand Rounds is worth considering. Medical practitioners have used this case study-based process over many years almost as a cultural ritual (Myint & Sabanathan, 2005: 297; Wolak, Cairns & Smith, 2008: 176). The format allows exploration of broad topics related to patient care through facilitated discussion with peers (Wolak et al., 2008 p 173). This paper shares how this format was used to encourage ongoing reflective practice, and foster clinical reasoning amongst nurses at The Maitland Hospital.