Design and optimization of bonded patch repairs of laminated composite structures

Abstract The present study proposes a method for design optimization of external patched repairs. The tensile behavior of notched specimens with patched repair was studied using finite element analysis and compared with experimental results. It was found that high stress concentrations along the transverse edges of circular patches and/or at the longitudinal edges of the hole leads to early damage initiation in the parent plate. The damage initiation site and its propagation depend on the patch in-plane stiffness. The optimal patch design can be characterized by a strength ratio R ∗ . The overall design of the patch repair can be considered using a dimensionless design parameter K .

[1]  Wing Kong Chiu,et al.  Airworthiness of composite repairs: Failure mechanisms , 1995 .

[2]  Constantinos Soutis,et al.  Analysis of adhesively bonded repairs in composites: Damage detection and prognosis , 2013 .

[3]  Design and optimization of composite laminates repaired by bonding external patches , 2011 .

[4]  Chun H. Wang,et al.  Optimum shapes of scarf repairs , 2009 .

[5]  Robert Lipton,et al.  Optimization of a composite scarf repair patch under tensile loading , 2009 .

[6]  Henrik Karlsson,et al.  Evaluation of FE-Software for Mechanical Analysis of Composite Materials , 2005 .

[7]  Chun H. Wang,et al.  On the design methodology of scarf repairs to composite laminates , 2008 .

[8]  F. L. Matthews,et al.  Adhesively-bonded repairs to fibre-composite materials II. Finite element modelling , 1998 .

[9]  Guoping Wang,et al.  Progressive failure analysis of bonded composite repairs , 2007 .

[10]  C Soutis,et al.  Design and performance of bonded patch repairs of composite structures , 1997 .

[11]  Xiaojing Gong,et al.  Tensile behaviour of patch-repaired CFRP laminates , 2011 .

[12]  D. Bond,et al.  Principles and practices of adhesive bonded structural joints and repairs , 1999 .

[13]  Cong N. Duong,et al.  Composite Repair: Theory and Design , 2007 .

[14]  Constantinos Soutis,et al.  Damage monitoring and analysis of composite laminates with an open hole and adhesively bonded repairs using digital image correlation , 2013 .

[15]  A. Harman,et al.  Micrographic studies on adhesively bonded scarf repairs to thick composite aircraft structure , 2009 .

[16]  M. Ramji,et al.  Towards optimization of patch shape on the performance of bonded composite repair using FEM , 2013 .

[17]  X. Gong,et al.  Experimental observation of tensile behavior of patch repaired composites , 2014 .

[18]  G. Qing,et al.  A three-dimensional semi-analytical model for the composite laminated plates with a stepped lap repair , 2011 .

[19]  M. D. Moura,et al.  Modelling single and double-lap repairs on composite materials , 2005 .

[20]  Constantinos Soutis,et al.  Strength prediction of patch-repaired CFRP laminates loaded in compression , 2000 .

[21]  M. Ramji,et al.  Design of optimum patch shape and size for bonded repair on damaged Carbon fibre reinforced polymer panels , 2014 .

[22]  Constantinos Soutis,et al.  Compressive behaviour of CFRP laminates repaired with adhesively bonded external patches , 1999 .