Optimization of composite patch repair processes with the use of genetic algorithms

Papathanassiou, TK; Filopoulos, SP; Tsamasphyros, GJ

dc.contributor.author	Papathanassiou, TK	en
dc.contributor.author	Filopoulos, SP	en
dc.contributor.author	Tsamasphyros, GJ	en
dc.date.accessioned	2014-03-01T01:36:35Z
dc.date.available	2014-03-01T01:36:35Z
dc.date.issued	2011	en
dc.identifier.issn	1389-4420	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21349
dc.subject	Adhesive bonding	en
dc.subject	Composite patch repair	en
dc.subject	Degree of cure	en
dc.subject	Genetic algorithms	en
dc.subject.classification	Engineering, Multidisciplinary	en
dc.subject.classification	Operations Research & Management Science	en
dc.subject.classification	Mathematics, Interdisciplinary Applications	en
dc.subject.other	Adhesive bonding	en
dc.subject.other	Aircraft availability	en
dc.subject.other	Aircraft industries	en
dc.subject.other	Composite patch repairs	en
dc.subject.other	Composite patches	en
dc.subject.other	Cure cycle	en
dc.subject.other	Cure rate	en
dc.subject.other	Cure reactions	en
dc.subject.other	Curing cycle	en
dc.subject.other	Degree of cure	en
dc.subject.other	Design vectors	en
dc.subject.other	Heat generation rate	en
dc.subject.other	Heat supply	en
dc.subject.other	High reliability	en
dc.subject.other	Matrix composite	en
dc.subject.other	Minimum time	en
dc.subject.other	Reduced cost	en
dc.subject.other	Riveted joints	en
dc.subject.other	Runge-Kutta	en
dc.subject.other	Second orders	en
dc.subject.other	Short durations	en
dc.subject.other	Structural reliability	en
dc.subject.other	Thermal profiles	en
dc.subject.other	Thermosetting polymers	en
dc.subject.other	Time integration	en
dc.subject.other	Genetic algorithms	en
dc.subject.other	Optimization	en
dc.subject.other	Plates (structural components)	en
dc.subject.other	Polymer matrix composites	en
dc.subject.other	Polymers	en
dc.subject.other	Repair	en
dc.subject.other	Runge Kutta methods	en
dc.subject.other	Stress intensity factors	en
dc.subject.other	Thermosets	en
dc.subject.other	Curing	en
dc.title	Optimization of composite patch repair processes with the use of genetic algorithms	en
heal.type	journalArticle	en
heal.identifier.primary	10.1007/s11081-010-9116-0	en
heal.identifier.secondary	http://dx.doi.org/10.1007/s11081-010-9116-0	en
heal.language	English	en
heal.publicationDate	2011	en
heal.abstract	The aim of this contribution is the optimization of some parameters of the composite patch repair technique (CPR). This technique is mainly used by the aircraft industry, as it offers high reliability, short repair times and reduced cost in compare to other methods, such as the riveted joints. CPR consists of adhesively bonding thin composite patches over cracked or corroded areas with heat supply. As the polymer-matrix composite patch is heated, it cures and toughens. Proper curing insures structural reliability of the repair. Short duration curing cycles are of great importance for the aircraft availability. With the use of Genetic Algorithms, we design minimum time curing cycles. The optimization is subjected to the following constraints: (1) Maximum allowed temperature in order to avoid residual stresses, (2) Minimum temperature in order to initiate the cure reaction, (3) Sufficient degree of cure at the end of the process and (4) Maximum heat generation rate that can be achieved by the device. Our design vector contains the duration of the plateau stage of the cure cycle and the characteristic thermal profile. The degree of cure is estimated with the use of the Kamal cure rate model for thermosetting polymers. For the numerical time integration of the cure rate equation, a second order, implicit Runge-Kutta scheme is employed. © 2010 Springer Science+Business Media, LLC.	en
heal.publisher	SPRINGER	en
heal.journalName	Optimization and Engineering	en
dc.identifier.doi	10.1007/s11081-010-9116-0	en
dc.identifier.isi	ISI:000288217300005	en
dc.identifier.volume	12	en
dc.identifier.issue	1-2	en
dc.identifier.spage	73	en
dc.identifier.epage	82	en