Characterization of stress in reinforcements in magnesium based squeeze infiltrated cast hybrid composites

✍ Scribed by S. Ravi Kumar; M.K. Panigrahi; S.K. Thakur; K.U. Kainer; M. Chakraborty; B.K. Dhindaw

• Publisher: Elsevier Science
• Year: 2006
• Tongue: English
• Weight: 493 KB
• Volume: 415
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2005.09.097

✦ Synopsis

Characterizing residual stresses in the reinforcement of cast composites has been studied in the present work. Micro Raman Spectroscopy is a unique tool for determining the strain on the reinforced fibres in ceramic/polymer/metal matrix composites. Stress induced Raman shifts can be used to determine the stress/strain in films, fibres and particulates in composites. In this paper, the application of Micro Raman Spectroscopy as a non-destructive technique in providing information on the compressional/tensile strain in reinforcements in metal matrix composites is investigated. Examples are taken from hybrid Mg based composites reinforced with carbon fibres, Mg 2 Si in situ reinforcement, formed by the addition of Si in to the matrix and SiC particles. The studies on the strain measurements in as-cast condition and its comparison after thermal cycling of the composites using the bandwidth measured are discussed. Analysis of the bandwidth offers a tool to understand that the wavenumber shift is strain induced. With this, the compressional state of the fibres embedded in the matrix can be analysed.