Strain field analysis of cancellous bone under compression by image correlation

• Author(s): Lopes, H. ; Nabais, C. ; Guedes, R.M. ; Morais, J.L. ; Simões, J.A.
• Date: 2006
• Persistent ID: http://hdl.handle.net/10198/4510
• Origin: Biblioteca Digital do IPB
• Subject(s): Cancellous bone; Measurement; Strain field
• Document Type: Conference Object
• Language: English

Description

Experimental mechanical analysis of cancellous bone has been performed to capture the global strain field of specimens under compression. One major objective is to assess the test procedure and obtain the cancellous bone mechanical properties. Now a day, several techniques are available for the experimental measurement of the field displacement. Among them, the Cross-Correlation is one of most simple’s techniques and can be applied to several studies cases. Based on the correlation of random speckle pattern between two images, the spatial displacement fields can be accessed. A simple digital camera or video recorder can be used without special light to capture the surface intensity pattern in each instant. If several images are taken during a test loading, the displacement field can be fallowed and subsequently the strain can be obtain by the spatial differentiation. Because of random surface pattern, the image can be divided in small areas, each of them pattern independent. By cross-correlating each of one between the two images, the relative displacement is obtained.