Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.010564
Tianyu Wang, Wael A. Altabey, M. Noori, Ramin Ghiasi
Beam-like structures are a class of common but important structures in engineering. Over the past few centuries, extensive research has been carried out to obtain the static and dynamic response of beam-like structures. Although building the finite element model to predict the response of these structures has proven to be effective, it is not always suitable in all the application cases because of high computational time or lack of accuracy. This paper proposes a novel approach to predict the deflection response of beam-like structures based on a deep neural network and the governing differential equation of Euler-Bernoulli beam. The Prandtl-Ishlinskii model is introduced as an element of prediction model to simulate the plasticity of this beam structure. Finally the application of the proposed approach is demonstrated through four numerical examples including linear elastic/ideal plastic beam under concentrated/sinusoidal load and elastic/plastic continues beam under seismic load to demonstrate a proof of concept for the effectiveness of this AI-based approach.
{"title":"A Deep Learning Based Approach for Response Prediction of Beam-like\u0000Structures","authors":"Tianyu Wang, Wael A. Altabey, M. Noori, Ramin Ghiasi","doi":"10.32604/sdhm.2020.010564","DOIUrl":"https://doi.org/10.32604/sdhm.2020.010564","url":null,"abstract":"Beam-like structures are a class of common but important structures in engineering. Over the past few centuries, extensive research has been carried out to obtain the static and dynamic response of beam-like structures. Although building the finite element model to predict the response of these structures has proven to be effective, it is not always suitable in all the application cases because of high computational time or lack of accuracy. This paper proposes a novel approach to predict the deflection response of beam-like structures based on a deep neural network and the governing differential equation of Euler-Bernoulli beam. The Prandtl-Ishlinskii model is introduced as an element of prediction model to simulate the plasticity of this beam structure. Finally the application of the proposed approach is demonstrated through four numerical examples including linear elastic/ideal plastic beam under concentrated/sinusoidal load and elastic/plastic continues beam under seismic load to demonstrate a proof of concept for the effectiveness of this AI-based approach.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69900679","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.010743
Alan Alonso-Rivers, R. Salgado-Estrada
A dynamic simulation method for cracked structures is implemented to determine their dynamic response with the purpose of evaluating their structural behavior. The procedure makes possible the simulation of three-dimensional cracked structures. The excitation force is randomly generated to simulate wind gusts. It is assumed the structure remains in the elastic range, which allows for each mode that contributes to its dynamic response to be decoupled. The results indicate that the presence of damage causes changes in the modals parameters of the structure as accurate as other similar methods proposed for simpler structures. Therefore, it is concluded that the proposed method is a reliable way to evaluate the dynamic behavior of three-dimensional cracked building structures.
{"title":"Dynamic Simulation of Cracked Buildings for Damage Detection","authors":"Alan Alonso-Rivers, R. Salgado-Estrada","doi":"10.32604/sdhm.2020.010743","DOIUrl":"https://doi.org/10.32604/sdhm.2020.010743","url":null,"abstract":"A dynamic simulation method for cracked structures is implemented to determine their dynamic response with the purpose of evaluating their structural behavior. The procedure makes possible the simulation of three-dimensional cracked structures. The excitation force is randomly generated to simulate wind gusts. It is assumed the structure remains in the elastic range, which allows for each mode that contributes to its dynamic response to be decoupled. The results indicate that the presence of damage causes changes in the modals parameters of the structure as accurate as other similar methods proposed for simpler structures. Therefore, it is concluded that the proposed method is a reliable way to evaluate the dynamic behavior of three-dimensional cracked building structures.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research will develop a set of assessment techniques and procedures for exterior wall deterioration detection. The proposed method is mainly based on equipped with high-resolution photographic equipment for unmanned aerial vehicle (UAV). To overcome the problems of visual inspection difficulties due to different angles and height, the proposed method provides a safer and more efficient detection way to get the buildings’ exterior status. After using the proposed method to analyze the images taken from UAV, the size of the damaged area can be evaluated more accurately, and the accuracy rate of visual assessment will be significantly improved. The results of the proposed method can reduce the accidents caused by the inspection process in the critical environment and the costs incurred by the temporary facilities without sacrificing the quality of the inspection results. Then, the research will implement the existing visual assessment method because of the characteristics of rapid detection, however, the assessment results will be different from different inspectors due to subjectivity. Thus, the research will present an improved visual inspection method by using UAVand Forward Looking Infred Thermal technology (FLIR). The result will be presented by Condition Index (CI-Level) instead to improve the subjectivity of the personnel.
{"title":"Improvement of UAV Based an Evaluation Approach to Mid-High Rise\u0000Buildings’ Exterior Walls","authors":"Nai-Hsin Pan, Ching-hsiang Tsai, Kuei-yen Chen, Shiaofang Sung","doi":"10.32604/sdhm.2020.06489","DOIUrl":"https://doi.org/10.32604/sdhm.2020.06489","url":null,"abstract":"This research will develop a set of assessment techniques and procedures for exterior wall deterioration detection. The proposed method is mainly based on equipped with high-resolution photographic equipment for unmanned aerial vehicle (UAV). To overcome the problems of visual inspection difficulties due to different angles and height, the proposed method provides a safer and more efficient detection way to get the buildings’ exterior status. After using the proposed method to analyze the images taken from UAV, the size of the damaged area can be evaluated more accurately, and the accuracy rate of visual assessment will be significantly improved. The results of the proposed method can reduce the accidents caused by the inspection process in the critical environment and the costs incurred by the temporary facilities without sacrificing the quality of the inspection results. Then, the research will implement the existing visual assessment method because of the characteristics of rapid detection, however, the assessment results will be different from different inspectors due to subjectivity. Thus, the research will present an improved visual inspection method by using UAVand Forward Looking Infred Thermal technology (FLIR). The result will be presented by Condition Index (CI-Level) instead to improve the subjectivity of the personnel.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.07457
Hong Yan, Dingguo Zhang, Liang Li, Xiaoyu Luo
The construction of seaside facilities is a hot topic in the field of ocean engineering. In this paper, a new type of floating breakwater is designed by 3DCAD geometric modeling. Based on the vibration theory and finite element technology, the floating breakwater model is optimized, and the modal analysis of the structure with the bracket as main body and blades as functional attachments is carried out. Natural frequencies and mode shapes of the blades are first calculated, and the effects of the natural frequencies in both dry and wet conditions are taken into account. Modal analysis and harmonic response analysis of the bracket with different lengths by removing the blades are also carried out, and the different variations of the natural frequencies between several bracket units are compared. The responses of the key position of the bracket under different loads and different bracket lengths are analyzed. The influence of liquid on the natural frequency of the blades and the influence of the length of the bracket on the natural frequency of the bracket are discussed in the fluid-solid coupling state. Research in this paper provides a data basis for the safety assessment of the breakwater construction.
{"title":"Finite Element Analysis on Vibration Characteristics of an Offshore Floating Breakwater","authors":"Hong Yan, Dingguo Zhang, Liang Li, Xiaoyu Luo","doi":"10.32604/sdhm.2020.07457","DOIUrl":"https://doi.org/10.32604/sdhm.2020.07457","url":null,"abstract":"The construction of seaside facilities is a hot topic in the field of ocean engineering. In this paper, a new type of floating breakwater is designed by 3DCAD geometric modeling. Based on the vibration theory and finite element technology, the floating breakwater model is optimized, and the modal analysis of the structure with the bracket as main body and blades as functional attachments is carried out. Natural frequencies and mode shapes of the blades are first calculated, and the effects of the natural frequencies in both dry and wet conditions are taken into account. Modal analysis and harmonic response analysis of the bracket with different lengths by removing the blades are also carried out, and the different variations of the natural frequencies between several bracket units are compared. The responses of the key position of the bracket under different loads and different bracket lengths are analyzed. The influence of liquid on the natural frequency of the blades and the influence of the length of the bracket on the natural frequency of the bracket are discussed in the fluid-solid coupling state. Research in this paper provides a data basis for the safety assessment of the breakwater construction.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.08997
R. Chen, C. Miao
In order to study the fatigue properties of rib-to-deck welded connection and rib-to-rib welded connection in orthotropic steel bridge decks, a multi-scale finite element model was set up to analyze the stress distribution characteristics and the load test was conducted on the Taizhou Yangtze River Bridge. Comparing the vehicle test results with the multi-scale finite element model results to verify the accuracy of the finite element simulation for the stress response of two welded details. The results indicated that: The stress at the rib-to-deck welded connection and the rib-to-rib welded connection are the bending stress and the membrane stress, respectively; the stress response of the two welded connection has strong local characteristics; the lateral stress influence line of the two welded connection is relatively short and the length of the lateral stress influence line is greatly affected by the longitudinal ribs; increasing the thickness of the roof and longitudinal ribs can reduce the stress response and improve the stress performance of the heavy lanes. For the two welded details, the fatigue damage increment of the ordinary lane is greater than the heavy lane. The thickened roof and longitudinal ribs at the position of the heavy lane still cannot balance the fatigue damage caused by the heavy truck. Therefore, it is necessary to strictly control the fatigue effect of overloaded vehicles on steel box girders.
{"title":"Fatigue Performance Evaluation for Welded Details in Orthotropic Steel Deck\u0000Bridges Using Multi-Scale Finite Element Method","authors":"R. Chen, C. Miao","doi":"10.32604/sdhm.2020.08997","DOIUrl":"https://doi.org/10.32604/sdhm.2020.08997","url":null,"abstract":"In order to study the fatigue properties of rib-to-deck welded connection and rib-to-rib welded connection in orthotropic steel bridge decks, a multi-scale finite element model was set up to analyze the stress distribution characteristics and the load test was conducted on the Taizhou Yangtze River Bridge. Comparing the vehicle test results with the multi-scale finite element model results to verify the accuracy of the finite element simulation for the stress response of two welded details. The results indicated that: The stress at the rib-to-deck welded connection and the rib-to-rib welded connection are the bending stress and the membrane stress, respectively; the stress response of the two welded connection has strong local characteristics; the lateral stress influence line of the two welded connection is relatively short and the length of the lateral stress influence line is greatly affected by the longitudinal ribs; increasing the thickness of the roof and longitudinal ribs can reduce the stress response and improve the stress performance of the heavy lanes. For the two welded details, the fatigue damage increment of the ordinary lane is greater than the heavy lane. The thickened roof and longitudinal ribs at the position of the heavy lane still cannot balance the fatigue damage caused by the heavy truck. Therefore, it is necessary to strictly control the fatigue effect of overloaded vehicles on steel box girders.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.06482
Bo Liu, Haoran Li, Shuya Liu
: The buoyancy of groundwater can reduce the foundation bearing capacity and cause the metro tunnels to fl oat as a whole, which threatens the safety of structures seriously. Therefore, uplift piles are set up to improve the structural sta-bility. In this paper, FLAC3D software is used to establish the calculation models of pile foundation. The bearing failure process of uplift piles was simulated to study the in fl uencing factors on single pile load bearing capacity as well as the cooperative work laws of pile groups. The load-displacement curves of pile top under different length-diameter ratios, pile-soil interface characteristics and pile types are obtained, respectively. The results showed that, increasing the length-diameter ratio and the pile-soil interface roughness properly can improve the bearing capacity of uplift piles. Besides, changing the shapes of constant pile section can also improve it, which has the most signi fi cant effect concerning of saving material cost. In the loading process of pile groups, the ultimate bearing capacity of corner pile is the biggest, the side pile is the next, and the center pile is the smallest. The deformation characteristics of pile top are as follows: the center pile is the biggest, the side pile is the next, and corner pile is the smallest. Combined with the results, the uplift resistance of group piles can be enhanced pertinently, and the conclusions provide guidance for the design and construction of uplift piles in the actual engineer.
{"title":"Influencing Factors of Load Carrying Capacity and Cooperative Work Laws of\u0000Metro Uplift Piles","authors":"Bo Liu, Haoran Li, Shuya Liu","doi":"10.32604/sdhm.2020.06482","DOIUrl":"https://doi.org/10.32604/sdhm.2020.06482","url":null,"abstract":": The buoyancy of groundwater can reduce the foundation bearing capacity and cause the metro tunnels to fl oat as a whole, which threatens the safety of structures seriously. Therefore, uplift piles are set up to improve the structural sta-bility. In this paper, FLAC3D software is used to establish the calculation models of pile foundation. The bearing failure process of uplift piles was simulated to study the in fl uencing factors on single pile load bearing capacity as well as the cooperative work laws of pile groups. The load-displacement curves of pile top under different length-diameter ratios, pile-soil interface characteristics and pile types are obtained, respectively. The results showed that, increasing the length-diameter ratio and the pile-soil interface roughness properly can improve the bearing capacity of uplift piles. Besides, changing the shapes of constant pile section can also improve it, which has the most signi fi cant effect concerning of saving material cost. In the loading process of pile groups, the ultimate bearing capacity of corner pile is the biggest, the side pile is the next, and the center pile is the smallest. The deformation characteristics of pile top are as follows: the center pile is the biggest, the side pile is the next, and corner pile is the smallest. Combined with the results, the uplift resistance of group piles can be enhanced pertinently, and the conclusions provide guidance for the design and construction of uplift piles in the actual engineer.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.011009
Xiao-lei Man, Ganggang Sha, Shuigen Hu, H. Bao, Guangying Liu
: Geotubes are heterogeneous structures composed of fi lling sand and bag material, and its permeability characteristics are different from that of fi lling sand. The uncertainty of geotubes permeability characteristics results in the failure of seepage analysis of geotube dams, which restricts the safety assessment of the dams. As the basis of the study on the seepage mechanism of the geotubes, the in fl uence of particle grading on permeability coef fi cient of fi lling sand and sand covered with geotextiles were explored by the permeability tests of fi lling sand with different particle grading under the condition of sand covered with or without geotextiles. And the in fl uence of geotextiles on the permeability coef fi cient was analyzed by comparing permeability coef fi cient of sand covered with and without geotextiles. The test results show that the in fl uence of single particle size content on permeability coef fi cient is consistent under the condition of sand covered with and without geotextiles. The content of powder, fi ne, medium and coarse particles is linearly related to their respective permeability coef fi cients. And the content of powder, fi ne, medium particles is negatively correlated with their permeability coef fi cients, while the content of coarse particles is positively correlated with the permeability coef fi cient. But the permeability coef fi cient of sand covered with geotextiles is smaller than that of fi lling sand under the same conditions. Finally, the parameter d 250 C c C u was selected as a variable representing the particle grading to fi t the empirical formula of permeability coef fi cient of fi lling sand and sand covered with geotextiles.
土工管是由充填砂和袋状材料组成的非均质结构，其渗透特性与充填砂不同。土工管渗透特性的不确定性导致土工管坝渗流分析失效，制约了土工管坝的安全评价。作为土工管渗流机理研究的基础，通过不同颗粒级配的填土砂在覆砂和不覆土工布条件下的渗透性试验，探讨了颗粒级配对填砂和覆土工布砂渗透系数的影响。通过对比覆盖和不覆盖土工布的砂土渗透系数，分析了土工布对渗透系数的影响。试验结果表明，在覆砂和不覆土工布的情况下，单粒径含量对渗透系数的影响是一致的。粉粒、细粒、中粒和粗粒的含量与其各自的渗透系数呈线性关系。粉粒、细粒、中粒含量与其渗透系数呈负相关，粗粒含量与渗透系数呈正相关。但在相同条件下，土工布覆盖砂的渗透系数小于充填砂。最后，选取参数d 250 C C C u作为代表颗粒级配的变量，拟合充填砂和覆盖土工布砂渗透系数经验公式。
{"title":"Experimental Study on Permeability Characteristics of Geotubes for Seepage\u0000Analysis on Safety Assessment of Dams","authors":"Xiao-lei Man, Ganggang Sha, Shuigen Hu, H. Bao, Guangying Liu","doi":"10.32604/sdhm.2020.011009","DOIUrl":"https://doi.org/10.32604/sdhm.2020.011009","url":null,"abstract":": Geotubes are heterogeneous structures composed of fi lling sand and bag material, and its permeability characteristics are different from that of fi lling sand. The uncertainty of geotubes permeability characteristics results in the failure of seepage analysis of geotube dams, which restricts the safety assessment of the dams. As the basis of the study on the seepage mechanism of the geotubes, the in fl uence of particle grading on permeability coef fi cient of fi lling sand and sand covered with geotextiles were explored by the permeability tests of fi lling sand with different particle grading under the condition of sand covered with or without geotextiles. And the in fl uence of geotextiles on the permeability coef fi cient was analyzed by comparing permeability coef fi cient of sand covered with and without geotextiles. The test results show that the in fl uence of single particle size content on permeability coef fi cient is consistent under the condition of sand covered with and without geotextiles. The content of powder, fi ne, medium and coarse particles is linearly related to their respective permeability coef fi cients. And the content of powder, fi ne, medium particles is negatively correlated with their permeability coef fi cients, while the content of coarse particles is positively correlated with the permeability coef fi cient. But the permeability coef fi cient of sand covered with geotextiles is smaller than that of fi lling sand under the same conditions. Finally, the parameter d 250 C c C u was selected as a variable representing the particle grading to fi t the empirical formula of permeability coef fi cient of fi lling sand and sand covered with geotextiles.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.07619
Peishuai Chen, Jun-jie Cao, Wei-zhong Chen, W. Rao
Existing studies on the durability of subsea tunnel mainly focus on the concrete deterioration and steel corrosion, while there are few on the influence of mechanical properties deterioration of surrounding rock on the durability of subsea tunnel. To improve the accuracy of long-term stability prediction, seawater corrosion tests of intensely weathered surrounding rock of subsea tunnel are carried out. In this study, the strength characteristics of remolded samples of intensely weathered granite under different seawater concentrations are investigated, the strength attenuation equation under seawater corrosion is established, and the chemical damage evolution equation and model parameters are formulated, The findings provides the basis for analyzing the influence of corrosion and weakening of surrounding rock on the durability of tunnel within the operation period.
{"title":"Characteristics on Seawater Corrosion of Intensely Weathered Surrounding\u0000Rock of Subsea Tunnel","authors":"Peishuai Chen, Jun-jie Cao, Wei-zhong Chen, W. Rao","doi":"10.32604/sdhm.2020.07619","DOIUrl":"https://doi.org/10.32604/sdhm.2020.07619","url":null,"abstract":"Existing studies on the durability of subsea tunnel mainly focus on the concrete deterioration and steel corrosion, while there are few on the influence of mechanical properties deterioration of surrounding rock on the durability of subsea tunnel. To improve the accuracy of long-term stability prediction, seawater corrosion tests of intensely weathered surrounding rock of subsea tunnel are carried out. In this study, the strength characteristics of remolded samples of intensely weathered granite under different seawater concentrations are investigated, the strength attenuation equation under seawater corrosion is established, and the chemical damage evolution equation and model parameters are formulated, The findings provides the basis for analyzing the influence of corrosion and weakening of surrounding rock on the durability of tunnel within the operation period.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-01DOI: 10.32604/sdhm.2020.013001
W. Fan, Chi Wang
Due to the widespread use of carbon fiber reinforced polymer/plastic (CFRP), the nondestructive structural health monitoring for CFRP is playing an increasingly essential role. As a nonradiative, noninvasive and nondestructive detection technique, planar electrical capacitance tomography (PECT) electrodes array is employed in this paper to reconstruct the damage image according to the calculated dielectric constant changes. The shape and duty ratio of PECT electrodes are optimized according to the relations between sensitivity distribution and the dielectric constant of different anisotropic degrees. The sensitivity matrix of optimized PECT sensor is more uniform as the result shows, because the sensitivity of insensitivity area can be increased by adding rotation of optimized electrodes. The reconstructed image qualities due to different PECT arrays and different damage locations are investigated at last. The simulation results indicate that: PECT can be used to detect the surface damage of CFRP; the sensitivity matrix of PECT for CFRP is highly relevant with the degree of anisotropic dielectric constant; the rotatable PECT sensor with rotation has better performance in uniformity of sensitivity; for different damage locations, the rotatable sensor with rotation has better image quality in most cases.
{"title":"Damage Detection for CFRP Based on Planar Electrical Capacitance\u0000Tomography","authors":"W. Fan, Chi Wang","doi":"10.32604/sdhm.2020.013001","DOIUrl":"https://doi.org/10.32604/sdhm.2020.013001","url":null,"abstract":"Due to the widespread use of carbon fiber reinforced polymer/plastic (CFRP), the nondestructive structural health monitoring for CFRP is playing an increasingly essential role. As a nonradiative, noninvasive and nondestructive detection technique, planar electrical capacitance tomography (PECT) electrodes array is employed in this paper to reconstruct the damage image according to the calculated dielectric constant changes. The shape and duty ratio of PECT electrodes are optimized according to the relations between sensitivity distribution and the dielectric constant of different anisotropic degrees. The sensitivity matrix of optimized PECT sensor is more uniform as the result shows, because the sensitivity of insensitivity area can be increased by adding rotation of optimized electrodes. The reconstructed image qualities due to different PECT arrays and different damage locations are investigated at last. The simulation results indicate that: PECT can be used to detect the surface damage of CFRP; the sensitivity matrix of PECT for CFRP is highly relevant with the degree of anisotropic dielectric constant; the rotatable PECT sensor with rotation has better performance in uniformity of sensitivity; for different damage locations, the rotatable sensor with rotation has better image quality in most cases.","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69901777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-01-01DOI: 10.32604/sdhm.2019.07521
Nian Li
{"title":"Nonlinear Micromechanical Modelling of Transverse Tensile Damage Behavior in Fiber-Reinforced Polymer Composites","authors":"Nian Li","doi":"10.32604/sdhm.2019.07521","DOIUrl":"https://doi.org/10.32604/sdhm.2019.07521","url":null,"abstract":"","PeriodicalId":35399,"journal":{"name":"SDHM Structural Durability and Health Monitoring","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69900598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：