基于应变模态法的层合梁的损伤检测研究
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摘要
结构在建造和服役期间将不可避免出现损伤,发展合适的无损检测方法对其进行检测具有广泛的工程应用价值.基于多自由度振动力学和连续体损伤理论,发展了应变模态法损伤检测理论.通过预置损伤复合材料层合梁的动态加载试验,测得各个测点的应变时程响应,然后利用MATLAB编程对数据进行处理,从而得到结构的损伤应变模态曲线.数据处理结果精确反映了预置结构损伤的位置,由此证明了应变模态法能够应用于复合材料层合梁的损伤定位.最后基于有限元软件ABAQUS,利用连续体损伤理论对损伤纤维金属层合梁的模态进行分析,更进一步验证了当前应变模态法对损伤层合的损伤定位的可靠性.
Micro-damage is always unavoidably incurred in structure in fabrication and serving performance.It is of high value to develop an undamaged detection method for these structures.Based on the multi-DOF vibration of mechanics and continuum damage theory,strain-mode based undamaged detection method was discussed and applied in the undamaged detection of composite beam.The strain response of the damaged laminated composite beam at different tested points was obtained through the dynamic test of the structures.And the strain-model curves of the damage structures was acquired by dealing with the dates with the MATLAB programs.The result indicates the exact position of the damage in the structure,which proves the validity of the strain-model method on the damage detection of the laminated composite structure.At last,the model analysis was conducted by applying continuum damage theory based on finite element software ABAQUS,which further demonstrates the feasibility and reliability of the strain-mode method in predicting the damage of structure.
Micro-damage is always unavoidably incurred in structure in fabrication and serving performance.It is of high value to develop an undamaged detection method for these structures.Based on the multi-DOF vibration of mechanics and continuum damage theory,strain-mode based undamaged detection method was discussed and applied in the undamaged detection of composite beam.The strain response of the damaged laminated composite beam at different tested points was obtained through the dynamic test of the structures.And the strain-model curves of the damage structures was acquired by dealing with the dates with the MATLAB programs.The result indicates the exact position of the damage in the structure,which proves the validity of the strain-model method on the damage detection of the laminated composite structure.At last,the model analysis was conducted by applying continuum damage theory based on finite element software ABAQUS,which further demonstrates the feasibility and reliability of the strain-mode method in predicting the damage of structure.
引文
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[2]徐丽.框架结构节点损伤诊断的应变模态方法研究[J].广州大学学报:自然科学版,2005,4(5):423-427.XU Li.Investigation of strain modal method in damage detection of joint of frame structures[J].Journal of Guangzhou University:Natural Science Edition,2005,4(5):423-427.(In Chinese)
[3]邓焱,严普强.梁及桥梁应变模态与损伤测量的新方法[J].清华大学学报:自然科学版,2000,40(11):123-127.DENG Yan,YAN Pu-qiang.New approach for strain modal measurement and damage detection of bridges[J].Journal of Tsinghua University:Science and Technology,2000,40(11):123-127.(In Chinese)
[4]周先雁,沈蒲生.用应变模态对混凝土结构进行损伤识别的研究[J].湖南大学学报:自然科学版,1997,24(5):69-74.ZHOU Xian-yan,SHEN Pu-sheng.Study of damage assessment of concrete structures by strain model method[J].Journal of Hunan University:Naturnal Science,1997,24(5):69-74.(In Chinese)
[5]王文静,刘志明,缪龙秀.基于实验模态的结构应变模态分析[J].北方交通大学学报,2000,24(4):20-23.WANG Wen-jing,LIU Zhi-ming,MIAO Long-xiu.The strain modal analysis of structure based on modal testing[J].Journal of Northern Jiaotong University,2000,24(4):20-23.(In Chinese)
[6]赵才友,王平,全顺喜,等.基于应变模态变化率的钢轨损伤检测[J].振动.测试与诊断,2012,32(5):723-729.ZHAO Cai-you,WANG Ping,QUAN Shun-xi,et al.Damage inspection of rail based on strain mode gradient[J].Journal of Vibration,Measurement&Diagnosis,2012,32(5):723-729.(In Chinese)
[7]包振明,马骏,林哲,等.简支梁损伤定位的直接指标法应用[J].船舶工程,2013,35(5):79-82.BAO Zhen-ming,MA Jun,LIN Zhe,et al.Application of direct index method of simply supported beam damage location[J].Ship Engineering,2013,35(5):79-82.(In Chinese)
[8]REN W X,DE ROECK G.Structural damage identification using modal data I:Simulation verification[J].Journal of Structural Engineering,2002,128(1):87-95.
[9]REN W X,DE ROECK G.Structural damage identification using modal data II:Test verification[J].Journal of Structural Engineering,2002,128(1):96-104.
[10]XIA Y,HAO H,BROWNJOHN J M W,et al.Damage identification of structures with uncertain frequency and mode shape data[J].Earthquake Engineering&Structural Dynamics,2002,31(5):1053-1066.
[11]郭国会.桥梁结构动力损伤诊断方法研究[D].长沙:湖南大学土木工程学院.2001.GUO Guo-hui.Research on damage diagnosis of bridge structures based on the vibration parameters[D].Changsha:College of Civil Enginering,Hunan University,2001.(In Chinese)
[12]李军,于德栋,白会人.基于应变模态的结构损伤定位方法[J].世界地震工程,2007,23(1):104-109.LI Jun,YU De-dong,BAI Hui-ren.Damage localization of changes based on the strain modes for simply supported beam[J].World Earthquake Engineering,2007,23(1):104-109.(In Chinese)
[13]MURAKAMI S.Notion of continuum damage mechanics and its application to anisotropic creep damage theory[J].Journal of Engineering Materials and Technology,1982;105:99-105.
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