13th International Conference on Fracture June 16–21, 2013, Beijing, China -10- 6. Conclusions The focus of the paper is brittle fracture in PE structures resulting from crack growth. We outlined an alternative to the conventional approach for lifetime assessment. Our approach consists of a sound physical model of SCG and numerical simulation of the process. A combination of modeling and experimental work is required to evaluate the basic parameters employed in constitutive equations of the model. After that the numerical simulation of SCG can be readily performed. The experimental work is convenient to conduct with SCK specimen, since no in-situe observation is required and numerical tools for data analysis are developed. Note: the crack initiation time is ignored. Thus, the lifetime assessment is a conservative one: it gives the lower bound of life expectance. References [1] A.A. Griffith, The phenomena of rupture and flow in solids. Philos T Roy Soc A, 221 (1921) 163–198. [2] G.I. Barenblatt, On equilibrium cracks formed in brittle fracture. General concepts and hypothesis. Axisymmetric cracks. J Appl Math Mech (PPM), 23, No. 3 (1959) 622–636. [3] G.I. Barenblatt, Mathematical theory of equilibrium cracks in brittle fracture, Adv Appl Mech, VII (1962) 55–129. [4] D.S. Dugdale, Yielding of steel sheets containing slits. J Mech Phys Solids, 8 (1960) 100–104. [5] A. Chudnovsky, V.A. Dunaevsky, and V.A. Khandogin, On the Quasistatic Growth of Cracks, Arch Mech, 30, 2 (1978) 165–174. [6] V. Khandogin, A. Chudnovsky, The Thermodynamic Analysis of Quasistatic Crack Growth, Dynamics and Strength of Aircraft Construction, 4 (1978) 148–175. [7] J. Botsis, A. Chudnovsky, A. Moet, Fatigue Crack Layer Propagation in Polystyrene. 1. Experimental-Observations, Int J Fracture, 33 (1987) 263–276. [8] J. Botsis, A. Chudnovsky, A. Moet, Fatigue Crack Layer Propagation in Polystyrene. 2. Analysis, Int J Fracture, 33 (1987) 277–284. [9] K. Kadota, A. Chudnovsky, Constitutive-Equations of Crack Layer Growth, Polym Eng Sci, 32 (1992) 1097–1104. [10]A. Stojimirovic, K. Kadota, A. Chudnovsky, An Equilibrial Process Zone in Polymeric Materials, J Appl Polym Sci, 46 (1992) 1051–1056. [11] B. H. Choi, W. Balika, A. Chudnovsky, G. Pinter, R.W. Lang, The Use of Crack Layer Theory to Predict the Lifetime of the Fatigue Crack Growth of High Density Polyethylene, Polym Eng Sci, 49 (2009) 1421–1428. [12]A. Chudnovsky, Y. Shulkin, Application of crack layer theory to modeling of slow crack growth in polyethylene, Int J Fracture, 97 (1999) 83–102. [13]A. Chudnovsky, Z. Zhou, and H. Zhang, Lifetime Assessment of Engineering Thermoplastics, Int J Eng Sci, 59 (2012) 108–139. [14]H. Tada, P. Paris, and G. Irwin, The Stress Analysis of Crack Handbook, ASME Press, New York, 2000. [15]M.L. Williams, On the stress distribution at the base of a stationary crack, J Appl Mech, 24 (1957) 109–114. [16]S. Mostovoy, P.B. Crosley, and E.J. Ripling, Use of crack loaded specimens for measuring plane-strain fracture toughness, J Mater, 2 (1967) 661–681.
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