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PARAMETER STUDY ON STEEL PLATES REINFORCED BY CFRP PLATES WITH FINITE ELEMENT METHOD
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摘要: CFRP加固含疲劳裂纹钢板可显著提高其疲劳寿命。采用有限元分析方法,详细研究了CFRP长度、宽度、厚度、弹性模量,胶层的剪切模量和厚度等各种参数对加固效果的影响。结果表明:提高CFRP的弹性模量、厚度,采用适当的胶层剪切模量、厚度,对提高加固效果显著。根据有限元计算结果,归纳得出应力强度因子幅的计算经验公式,该经验公式与有限元计算结果和试验结果符合较好,可用于计算CFRP加固含疲劳裂纹钢板疲劳寿命的计算。Abstract: The fatigue life of cracked steel plate can be significantly increased by external bonded CFRP plates. The influence parameters, such as the length, width, thickness, elastic modulus of CFRP, and the thickness, shear modulus of adhesive, on stress intensity factor( SIF) of fatigue crack front face were studied with finite element method( FEM). The results showed that increasing the thickness and elastic modulus of CFRP, using moderate thickness and shear modulus of adhesive led to good strengthening effect. Based on the FEM results, an empirical formula of SIF was suggested. The fatigue crack propagation predicted by the suggested empirical formula is found to have good agreement with experimental result,and can be usd to evaluate the fatigue life of cracked steel plate strengthened with CFRP plates.
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Key words:
- CFRP plate /
- strengthening /
- steel structure /
- fatigue crack /
- fatigue life /
- stress intensity factor /
- finite element method
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[2] 郑云,叶列平,岳清瑞,等.CFRP加固疲劳损伤受拉钢板的疲劳性能试验研究//马建勋.2005全国FRP与结构加固会议论文集.西安:2005 郑云,叶列平.岳清瑞.FRP加固钢结构的研究进展.工业建筑,2005,35(8):20-25 [3] 郑云,叶列平,岳清瑞.CFRP加固疲劳损伤钢结构的断裂力学分析.工业建筑,2005,35(10):79-82 [4] Sun C T,Klug J,Arendt C.Analysis of Cracked Aluminum Plates Repaired with Bonded Composite Patches.AIAA,1996,34(2):369-374 [5] Paris P C,Erdogan F.A Critical Analysis of Crack Propagation Laws.Journal of Basic Engineering,1963,85:528-534 [6] Sun C T,Klug J,Arend C.Analysis of Cracked Aluminum Plates Repaired with Bonded Composite Patches.AIAA,1996,34(2):369-374 [7] Chue,C H,Chang L C,Tsai J S.Bonded Repair of a Plate with Inclined Central Crack under Biaxial Loading.Composie Structures,1994,28(1):39-45 [8] Endogan F,Ratwani M M.Stress Distribution in Bonded Joints.Journal of Composite Materials,1971 (5) 378-393 [9] Ratwani M M.Characterization of Fatigue Crack Growth in Bonded Structures.Wright-Patlerson:Air Force Flight Dynamics Lab,AFFDL-TR-1977:77-31 -
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