Experimental study of fatigue crack growth behaviour in adhesively reinforced steel structures

Abstract The use of adhesively-bonded composite materials has lead to great advances in repairing and strengthening cracked or aged metallic structures. However, less is known about the fatigue performance of the bonding between the composites and the metallic substrate, which is the deciding factor when designing the strengthening. In this study, a series of experiments is performed to investigate the effectiveness of the composites on preventing fatigue crack propagation and extending the fatigue life of steel plates. The composite material of CFRP sheet is adopted. Both single-sided and double-sided repairs are studied. Experimental results show that the application of composite patches substantially reduces crack growth rate and prolong fatigue life. The double-sided repair scheme increased the fatigue life by 2.2–2.7 times over un-patched steel plates when normal modulus CFRP sheets were used, and by 4.7–7.9 times when high modulus CFRP sheets were used. The CFRP sheets with high modulus were found to be much more efficient. Bond width has considerable influence on the crack growth life. These two findings were especially true for double-sided repairs. The parameters of patch thickness, patch length and patch configuration, had an influence on fatigue life increase of over 20% for both single-sided and double-sided repairs, except that patch configuration had only a 6% influence on fatigue life increase for double-sided repairs. Furthermore these three parameters had slightly more influence on single-sided repairs than on double-sided repairs.

[1]  J W Gillespie,et al.  ENHANCEMENTS TO THE BOND BETWEEN ADVANCED COMPOSITE MATERIALS AND STEEL FOR BRIDGE REHABILITATION , 2002 .

[2]  Alain Nussbaumer,et al.  Analysis of cracked steel members reinforced by pre-stress composite patch , 2003 .

[3]  Fidelis R Mashiri,et al.  Fatigue tests and design of thin cold-formed square hollow section-to-plate T connections under cyclic in-plane bending , 2002 .

[4]  Hamid Saadatmanesh,et al.  Fatigue Strength of Steel Girders Strengthened with Carbon Fiber Reinforced Polymer Patch , 2003 .

[5]  Sami H. Rizkalla,et al.  Repair of damaged aluminum truss joints of highway overhead sign structures using FRP , 2006 .

[6]  Amr Shaat,et al.  Axial loading tests on short and long hollow structural steel columns retrofitted using carbon fibre reinforced polymers , 2006 .

[7]  Jeffrey A. Packer,et al.  Rehabilitation of tubular members with carbon reinforced polymers , 2006 .

[9]  Carlo Poggi,et al.  Fatigue performance of tensile steel members strengthened with CFRP plates , 2009 .

[10]  Jung-Ju Lee,et al.  Fatigue Behavior of Composite Patch Repaired Aluminum Plate , 2005 .

[11]  Željko Domazet,et al.  Comparison of fatigue crack retardation methods , 1996 .

[12]  Hossein Hosseini-Toudeshky,et al.  Effects of composite patches on fatigue crack propagation of single-side repaired aluminum panels , 2006 .

[13]  Marios K. Chryssanthopoulos,et al.  Strengthening of an artificially degraded steel beam utilising a carbon/glass composite system , 2006 .

[14]  Peter Chalkley,et al.  Fatigue Testing of Generic Bonded Joints , 2002 .

[15]  H. R. Daghyani,et al.  Experimental fatigue crack growth and crack-front shape analysis of asymmetric repaired aluminium panels with glass/epoxy composite patches , 2005 .

[16]  Dennis R. Mertz,et al.  REHABILITATION OF STEEL BRIDGE GIRDERS THROUGH THE APPLICATION OF ADVANCED COMPOSITE MATERIALS , 1996 .

[17]  R. Al-Mahaidi,et al.  Investigation into the bond between CFRP and steel tubes , 2004 .

[18]  X. Zhao,et al.  State-of-the-art review on FRP strengthened steel structures , 2007 .

[19]  M. Ratwani.  Analysis of Cracked, Adhesively Bonded Laminated Structures , 1979 .

[20]  Alan Baker,et al.  Fatigue crack growth in adhesively bonded composite-metal double-lap joints , 2002 .

[21]  L C Hollaway,et al.  Progress in the technique of upgrading metallic structures with advanced polymer composites , 2002 .

[22]  Alain Nussbaumer,et al.  Fatigue resistance and repairs of riveted bridge members , 1998 .

[23]  Alain Nussbaumer,et al.  Crack repair and fatigue life extension of riveted bridge members using composite materials , 2000 .

[24]  Raphael H. Grzebieta,et al.  Bending strength of CFRP-strengthened circular hollow steel sections , 2006 .

[25]  L. C. Hollaway,et al.  Advances in Adhesive Joining of Carbon Fibre/Polymer Composites to Steel Members for Repair and Rehabilitation of Bridge Structures , 2006 .

[26]  Scott A. Civjan,et al.  APPLICATION OF FIBER REINFORCED POLYMER OVERLAYS TO EXTEND STEEL FATIGUE LIFE , 2003 .

[27]  Chris P. Pantelides,et al.  Rehabilitation of Cracked Aluminum Connections with GFRP Composites for Fatigue Stresses , 2007 .

[28]  Bijan Mohammadi,et al.  A simple method to calculate the crack growth life of adhesively repaired aluminum panels , 2007 .

[29]  Jun Deng,et al.  Fatigue performance of metallic beam strengthened with a bonded CFRP plate , 2007 .

[30]  Chris P. Pantelides,et al.  Repair of Cracked Aluminum Overhead Sign Structures with Glass Fiber Reinforced Polymer Composites , 2003 .

[31]  Shankar Mall,et al.  Investigation into cracked aluminum plate repaired with bonded composite patch , 2007 .

[32]  Alan Baker,et al.  Advances in the Bonded Composite Repair of Metallic Aircraft Structure , 2002 .

[33]  A. Baker.  Fatigue Crack Propagation Studies on Aluminium Panels Patched with Boron/Epoxy Composites , 1991 .