Abstract
A modified version of the Kachanov damage accumulation law is employed to study the damage kinetics in laminated composite materials such as epoxy/graphite laminates.
The primary objective of the present work is to quantify the characteristic events involved in the final stages of the failure process in composite materials following occurrence of the CDS.
The process of localization and spread of damage ahead of the dominant matrix crack is viewed as a sequence of nucleation and propagation phases both of which may be described by use of the internal damage parameter. This scalar quantity reflects the ratio of the current crack (or pore) density to its saturation, or critical level. It is shown that the Continuous Damage Mechanics (CDM) approach is useful in modeling a damage field consisting mainly of the fiber breaks generated ahead of the matrix crack and clustered around the plane of a prospective fracture, thus forming the so-called “damage band” embedded within the stress field of the dominant crack. Description of this type of damage applies to the failure process which follows formation of the “characteristic damage state” (CDS) observed in a number of multiphase materials.
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On leave from the University of Wisconsin-Milwaukee, Milwaukee, WI 53201, USA.
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Wnuk, M.P., Kriz, R.D. CDM model of damage accumulation in laminated composites. Int J Fract 28, 121–138 (1985). https://doi.org/10.1007/BF00018488
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DOI: https://doi.org/10.1007/BF00018488