双斜接修补复合材料层合板的拉伸行为及影响因素
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摘要
基于试验和有限元数值方法对双斜接修补碳纤维增强聚合物(CFRP)复合材料层合板在拉伸载荷作用下的力学行为开展研究。通过试验分析了两种不同厚度的双斜接修补复合材料结构的承载能力和失效形式。结果表明,对于不同厚度的双斜接修补复合材料结构,失效强度接近,主要破坏形式均以胶层内聚破坏为主,伴随局部的90°基体开裂。利用连续介质损伤力学模型和内聚力模型分别对复合材料和胶层失效进行描述,通过数值方法开展双斜接修补结构的强度预测和损伤演化分析。数值结果与试验吻合较好,并且指出复合材料基体开裂起始早于胶层失效。通过有限元模型讨论了附加层、双斜接内部尖端所处位置和修补胶层参数对修补性能的影响。
Experimental and numerical works were performed to investigate the mechanical behavior of double scarf-repaired carbon fiber reinforced polymer(CFRP)composite laminates under tensile loading.The load capacity and damage mode of two different thicknesses double scarf-repaired composites were experimentally studied.The results indicate that for double scarf-repaired composites with different thicknesses,the failure strengths are similar and the dominated failure mode is cohesive failure of the adhesive,accompanied by partial 90° matrix crack of composites.A finite element model was established to predict the failure strength and the damage evolution,in which continuum damage model and cohesive zone model were used to describe the composite and adhesive damage respectively.The numerical results show good agreement with the test results and indicate that the matrix crack of the composites initiates prior to the adhesive failure.Based on the validated model,the influences of overlap patch,location of inner tip and adhesive properties were analyzed.
Experimental and numerical works were performed to investigate the mechanical behavior of double scarf-repaired carbon fiber reinforced polymer(CFRP)composite laminates under tensile loading.The load capacity and damage mode of two different thicknesses double scarf-repaired composites were experimentally studied.The results indicate that for double scarf-repaired composites with different thicknesses,the failure strengths are similar and the dominated failure mode is cohesive failure of the adhesive,accompanied by partial 90° matrix crack of composites.A finite element model was established to predict the failure strength and the damage evolution,in which continuum damage model and cohesive zone model were used to describe the composite and adhesive damage respectively.The numerical results show good agreement with the test results and indicate that the matrix crack of the composites initiates prior to the adhesive failure.Based on the validated model,the influences of overlap patch,location of inner tip and adhesive properties were analyzed.
引文
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[9]谢宗蕻,王绥安,李想.复合材料织物层合板挖补修理软件实现与试验验证[J].复合材料学报,2017,34(7):1451-1461.XIE Z H,WANG S A,LI X.Composite fabric laminate scarf repair analysis:Soft-ware development and experimental validation[J].Acta Materiae Compositae Sinica,2017,34(7):1451-1461(in Chinese).
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[11]冯威,徐绯.冲击作用下斜接修补CFRP层间分层和胶层的损伤机制及参数分析[J].复合材料学报,2018,35(4):1024-1031.FENG W,XU F.Damage mechanism of laminates delamination and bondline for scarf repaired CFRP under impact and parameter study[J].Acta Materiae Compositae Sinica,2018,35(4):1024-1031(in Chinese).
[12]GOH J Y,GEORGIADIS S,ORIFICI A C,et al.Effects of bondline flaws on the damage tolerance of composite scarf joints[J].Composites Part A:Applied Science&Manufacturing,2013,55(7):110-119.
[13]GUNNION A J,HERSZBERG I.Parametric study of scarf joints in composite structures[J].Composite Structures,2006,75(1):364-376.
[14]BENDEMRA H,COMPSTON P,CROTHERS P J.Optimisation study of tapered scarf and stepped-lap joints in composite repair patches[J].Composite Structures,2015,130:1-8.
[15]KHASHABA U A,ALJINAIDIlI A A,HAMED M A.A-nalysis of adhesively bonded CFRE composite scarf joints modified with MWCNTs[J].Composites Part A:Applied Science&Manufacturing,2015,71:59-71.
[16]GACOIN A,LESTRIEZ P,ASSIH J,et al.Comparison between experimental and numerical study of the adhesively bonded scarf joint and double scarf joint:Influence of internal singularity created by geometry of the double scarf joint on the damage evolution[J].International Journal of Adhesion&Adhesives,2009,29(5):572-579.
[17]LIAO L,SAWA T,HUANG C.Numerical analysis on loadbearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending[J].International Journal of Adhesion&Adhesives,2014,53(18):65-71.
[18]LEE Y J,HUANG C H.Ultimate strength and failure process of composite laminated plates subjected to low-velocity impact[J].Journal of Reinforced Plastics&Composites,2003,22(12):1059-1081.
[19]吴义韬,姚卫星,沈浩杰.复合材料宏观强度准则预测能力分析[J].复合材料学报,2015,32(3):864-873.WU Y T,YAO W X,SHEN H J.Prediction ability analysis of macroscopic strength criteria for composites[J].Acta Materiae Compositae Sinica,2015,32(3):864-873(in Chinese).
[20]HASHION Z.Failure criteria for unidirectional fiber composites[J].Journal of Applied Mechanics,1980,47(2):329-334.
[2]SANKAR B V.Review of recent advances in structural joints and repair for composite materials[J].AIAA Journal,2012,42(4):860-861.
[3]BUNDHE S,BANEA M D,BARROS S D,et al.An updated review of adhesively bonded joints in composite materials[J].International Journal of Adhesion&Adhesives,2016,72:30-42.
[4]LIU B,XU F,FENG W,et al.Experiment and design methods of composite scarf repair for primary-load bearing structures[J].Composites Part A:Applied Science and Manufacturing,2016,88:27-38.
[5]KHASHABA U A,ALJINAIDI A A,HAMED M A.Fatigue and reliability analysis of nano-modified scarf adhesive joints in carbon fiber composites[J].Composites Part B:Engineering,2017:103-117.
[6]ERDOGAN F,RATWANI M.Stress distribution in bonded joints[J].Journal of Composite Materials,1971,5(3):378-393.
[7]HARMAN A B,WANG C H.Improved design methods for scarf repairs to highly strained composite aircraft structure[J].Composite Structures,2006,75(1-4):132-144.
[8]刘斌,徐绯,季哲,等.改进的复合材料斜接结构胶层应力半解析法[J].复合材料学报,2015,32(2):526-533.LIU B,XU F,JI Z,et al.Modified semi-analytical method for adhesive stress of scarf joints in composite structure[J].Acta Materiae Compositae Sinica,2015,32(2):526-533(in Chinese).
[9]谢宗蕻,王绥安,李想.复合材料织物层合板挖补修理软件实现与试验验证[J].复合材料学报,2017,34(7):1451-1461.XIE Z H,WANG S A,LI X.Composite fabric laminate scarf repair analysis:Soft-ware development and experimental validation[J].Acta Materiae Compositae Sinica,2017,34(7):1451-1461(in Chinese).
[10]YOO J S,TRUONG V H,PARK M Y,et al.Parametric study on static and fatigue strength recovery of scarf-patchrepaired composite laminates[J].Composite Structures,2016,140:417-432.
[11]冯威,徐绯.冲击作用下斜接修补CFRP层间分层和胶层的损伤机制及参数分析[J].复合材料学报,2018,35(4):1024-1031.FENG W,XU F.Damage mechanism of laminates delamination and bondline for scarf repaired CFRP under impact and parameter study[J].Acta Materiae Compositae Sinica,2018,35(4):1024-1031(in Chinese).
[12]GOH J Y,GEORGIADIS S,ORIFICI A C,et al.Effects of bondline flaws on the damage tolerance of composite scarf joints[J].Composites Part A:Applied Science&Manufacturing,2013,55(7):110-119.
[13]GUNNION A J,HERSZBERG I.Parametric study of scarf joints in composite structures[J].Composite Structures,2006,75(1):364-376.
[14]BENDEMRA H,COMPSTON P,CROTHERS P J.Optimisation study of tapered scarf and stepped-lap joints in composite repair patches[J].Composite Structures,2015,130:1-8.
[15]KHASHABA U A,ALJINAIDIlI A A,HAMED M A.A-nalysis of adhesively bonded CFRE composite scarf joints modified with MWCNTs[J].Composites Part A:Applied Science&Manufacturing,2015,71:59-71.
[16]GACOIN A,LESTRIEZ P,ASSIH J,et al.Comparison between experimental and numerical study of the adhesively bonded scarf joint and double scarf joint:Influence of internal singularity created by geometry of the double scarf joint on the damage evolution[J].International Journal of Adhesion&Adhesives,2009,29(5):572-579.
[17]LIAO L,SAWA T,HUANG C.Numerical analysis on loadbearing capacity and damage of double scarf adhesive joints subjected to combined loadings of tension and bending[J].International Journal of Adhesion&Adhesives,2014,53(18):65-71.
[18]LEE Y J,HUANG C H.Ultimate strength and failure process of composite laminated plates subjected to low-velocity impact[J].Journal of Reinforced Plastics&Composites,2003,22(12):1059-1081.
[19]吴义韬,姚卫星,沈浩杰.复合材料宏观强度准则预测能力分析[J].复合材料学报,2015,32(3):864-873.WU Y T,YAO W X,SHEN H J.Prediction ability analysis of macroscopic strength criteria for composites[J].Acta Materiae Compositae Sinica,2015,32(3):864-873(in Chinese).
[20]HASHION Z.Failure criteria for unidirectional fiber composites[J].Journal of Applied Mechanics,1980,47(2):329-334.