Dynamic behavior of composites studied by caustics

Theocaris, PS

dc.contributor.author	Theocaris, PS	en
dc.date.accessioned	2014-03-01T01:06:09Z
dc.date.available	2014-03-01T01:06:09Z
dc.date.issued	1983	en
dc.identifier.issn	0015-0568	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/9194
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-0020950112&partnerID=40&md5=898bdb6c8ebf82b03b53d54a4aa1774f	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Materials Science, Multidisciplinary	en
dc.subject.other	MATERIALS SCIENCE - Testing	en
dc.subject.other	COMPOSITE MATERIALS	en
dc.title	Dynamic behavior of composites studied by caustics	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	1983	en
heal.abstract	The fracture behavior of fibrous and particulate composites was studied by the method of dynamic caustics. The caustic created around the tip of a stationary or running crack carries all the information necessary to evaluate the instantaneous crack velocity, mode of deformation and the variation of the stress field at the vicinity of the crack tip. Since the caustics may be recorded by a high-speed camera, regardless of the opaqueness or transparency of the material, the method can be applied directly to the construction materials. The behavior of a fibrous composite was considered first on a macroscopic scale, where the mean-fiber orientation to the load axis or to the initial crack direction, the volume fraction and similar large-scale quantities affect the crack velocity and crack-direction characteristics and the dynamic fracture stress. This macroscopic study cannot be easily connected to the corresponding behavior of a specific fiber or a specific inclusion. The fracture behavior of a specific fiber can be accurately simulated by studying the dynamic behavior of a crack approaching a bi-material interface when one phase stands for the matrix and the other for the fiber material. By varying the mechanical properties of the two phases and the relative inclination of the interface to the initial crack direction, it is possible to find the angles where a crack splits a fiber or runs parallel to it, including the case when the crack propagates momentarly along this interface. Interesting conclusions were reached concerning the real stress state and crack velocity in the close vicinity of an interface, including rapid velocity changes and a diffusion of the stress singularity in a thin layer surrounding the interface. © 1983.	en
heal.publisher	ELSEVIER SCI LTD	en
heal.journalName	Fibre Science and Technology	en
dc.identifier.isi	ISI:A1983RM73200001	en
dc.identifier.volume	19	en
dc.identifier.issue	3	en
dc.identifier.spage	157	en
dc.identifier.epage	177	en