Abstract
Recently, the improvement of stiffness and strength and the optimization of toughness behaviour have become an important focus of engineering science because of the expanding fields of application of polymeric materials not only for common, but also for constructional purposes [1]. Measurement of crack resistance curves (R-curves) using the stop block method with the multiple-specimen technique and analysis of R-curve data by means of various procedures are well established for the evaluation of toughness levels, especially those expressed as resistance against initiation and propagation of stable cracks [2–4]. However, the relatively large amount of time required for measuring and analysis and the expensive personnel involved work against considerations of economy. Hence, many research groups have been working intensively on developing approximate R-curve determination methods and on their application to polymeric materials [2,5–7]. Because of limits on the specimen geometry in standard fracture mechanics specimens and because of the loading conditions used, unstable crack propagation can often not be observed. In such cases it is also of interest to calculate material parameters describing the crack instability point [8].
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Grellmann W., Seidler S. (1991): unpublished
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Lach, R., Grellmann, W. (2001). An Alternative Method Based on J—T J and δ—T δ Stability Assessment Diagrams to Determine Instability Values from Crack Resistance Curves. In: Grellmann, W., Seidler, S. (eds) Deformation and Fracture Behaviour of Polymers. Engineering Materials. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-04556-5_10
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DOI: https://doi.org/10.1007/978-3-662-04556-5_10
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