Analysis of dynamic stress intensity factors of three-point bend specimen containing crack |
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Authors: | Ai-jun Chen Jun-jun Cao |
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Institution: | School of Sciences, Nanjing University of Science and Technology, Nanjing 210094,P.R.China |
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Abstract: | A new formula is obtained to calculate dynamic stress intensity factors of the three-point bending specimen containing a single
edge crack in this study. Firstly, the weight function for three-point bending specimen containing a single edge crack is
derived from a general weight function form and two reference stress intensity factors, the coefficients of the weight function
are given. Secondly, the history and distribution of dynamic stresses in uncracked three-point bending specimen are derived
based on the vibration theory. Finally, the dynamic stress intensity factors equations for three-pointing specimen with a
single edge crack subjected to impact loadings are obtained by the weight function method. The obtained formula is verified
by the comparison with the numerical results of the finite element method (FEM). Good agreements have been achieved. The law
of dynamic stress intensity factors of the three-point bending specimen under impact loadings varing with crack depths and
loading rates is studied. |
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Keywords: | crack dynamic stress intensity factor weight function method three-point bending specimen loading rate |
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