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    • Study on elastic-plastic component in indentation fatigue of sodalime glass

      Rajat Banerjee B K Sarkar

      Volume 19 Issue 5 October 1996 pp 759-765

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      https://www.ias.ac.in/article/fulltext/boms/019/05/0759-0765

    • Keywords

       

      Indentation; fatigue; elastic stress; yield stress; critical stress; residual stress; cracks; median; lateral; radial

    • Abstract

       

      Fracture mechanics studies on glass by indentation has become predominant in recent times. Interest in it has become more prominent due to a large application of such materials in areas of engineering applications encountering fluctuating stresses induced thermally, mechanically or physically. However, glass subjected to repeated indentation at a point prior to crack initiation with subcritical loads phenomenological to metal fatigue has not been systematically investigated. Repeated indentation at a single point with different subcritical loads (0·1N, 0·15N, 0·25N, 0·50N, 1·0N) was performed till radial cracks occurred. The length of the diagonal was measured after each indentation, which was found to increase with indentation cycle eventually leading to crack initiation. This observation was analysed considering the elastic plastic component and the residual stress developed during each cycle. A mathematical model has been postulated to correlate the contribution of cumulative residual stress for crack initiation.

    • Author Affiliations

       

      Rajat Banerjee1 B K Sarkar1 2

      1. Central Glass and Ceramic Research Institute, Jadavpur, Calcutta - 700 032, India
      2. Indian Association for the Cultivation of Science, Jadavpur, Calcutta - 700 032, India

    • Dates

       
      Published
      October 1996

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