Bond Failure

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Muhammad Ashraful Alam - One of the best experts on this subject based on the ideXlab platform.

  • Electrical Signatures of Corrosion and Solder Bond Failure in c-Si Solar Cells and Modules
    IEEE Journal of Photovoltaics, 2019
    Co-Authors: Reza Asadpour, Muhammad Ashraful Alam
    Abstract:

    Moisture- and temperature-activated corrosion of metal fingers, mechanical stress induced delamination, and Failure of solder Bonds rank among the leading Failure mechanisms of solar modules. The physics of moisture ingress, diffusion, and reaction have been explored in detail, but the electrical implications of corrosion and delamination on specific front-surface grid geometry is not fully understood. In this paper, we show that the module efficiency loss due to corrosion, delamination and solder Bond Failure (CDS) involves a complex interplay of voltage/current redistribution, reflected as a loss in photocurrent, as well as decrease/increase in shunt/series resistances. The analysis presented in this paper will redefine the interpretation of experimental I-V characteristic features due to degradation mechanisms, integrate a variety of scattered and counter-intuitive experimental results within a common theoretical framework, and inform CDS-resistant grid design for solar modules.

  • electrical signatures of corrosion and solder Bond Failure in c si solar cells and modules
    arXiv: Applied Physics, 2018
    Co-Authors: Reza Asadpour, Muhammad Ashraful Alam
    Abstract:

    Moisture- and temperature-activated corrosion of metal fingers, mechanical stress induced delamination, and Failure of solder Bonds rank among the leading Failure mechanisms of solar modules. The physics of moisture ingress, diffusion and reaction have been explored in detail, but the electrical implications of corrosion and delamination on specific front-surface grid geometry is not fully understood. In this paper, we show that the module efficiency loss due to corrosion, delamination, and solder Bond Failure (CDS) involves a complex interplay of voltage/current redistribution, reflected as a loss in photocurrent as well as decrease/increase in shunt/series resistances. Our work will redefine the interpretation of experimental J-V characteristics features due to degradation mechanisms, integrate a variety of scattered and counter-intuitive experimental results within a common theoretical framework, and inform CDS-resistant grid design for solar modules.

Y Yu - One of the best experts on this subject based on the ideXlab platform.

  • Bond Failure of steel beams strengthened with frp laminates part 1 model development
    Composites Part B-engineering, 2011
    Co-Authors: S P Chiew, Y Yu
    Abstract:

    To strengthen deteriorated steel structures, Bonding fiber reinforced polymer (FRP) laminate applied externally to the steel surface is a promising method. For FRP strengthened steel structures, the Bond performance between the FRP laminate and the steel structure is a crucial consideration which will directly influence strengthening effect and determine the final capacity of the strengthened structures. To investigate the Bond Failure mechanism of FRP Bonded steel structures, experiments on three types of FRP-steel joints were conducted. The Bond strengths of different configuration joints were found out. Besides the experimental investigation, finite element analyses were also carried out to study in detail the stress and strain distributions along the Bondline. It was found that the most important factors that influence the final Bond Failure is the stress concentration at the end of the Bondline. After analyzing the mechanism of Bond Failure, a Bond Failure model based on the Failure criterion of equivalent strain energy density was proposed.

  • Bond Failure of steel beams strengthened with FRP laminates – Part 1: Model development
    Composites Part B-engineering, 2011
    Co-Authors: S P Chiew, Y Yu
    Abstract:

    To strengthen deteriorated steel structures, Bonding fiber reinforced polymer (FRP) laminate applied externally to the steel surface is a promising method. For FRP strengthened steel structures, the Bond performance between the FRP laminate and the steel structure is a crucial consideration which will directly influence strengthening effect and determine the final capacity of the strengthened structures. To investigate the Bond Failure mechanism of FRP Bonded steel structures, experiments on three types of FRP-steel joints were conducted. The Bond strengths of different configuration joints were found out. Besides the experimental investigation, finite element analyses were also carried out to study in detail the stress and strain distributions along the Bondline. It was found that the most important factors that influence the final Bond Failure is the stress concentration at the end of the Bondline. After analyzing the mechanism of Bond Failure, a Bond Failure model based on the Failure criterion of equivalent strain energy density was proposed.

  • Bond Failure of steel beams strengthened with frp laminates part 2 verification
    Composites Part B-engineering, 2011
    Co-Authors: Y Yu, S P Chiew
    Abstract:

    The application of the new Bond Failure model developed in Part 1 to predict the Bond Failure load of fiber reinforced polymer (FRP) strengthened steel beam is presented in this paper. Full-scale experiments on FRP strengthened steel beams under four-point bending were first carried out. The effects of different strengthening parameters including laminate thickness, Bond length and adhesive thickness on the Bond strength were investigated experimentally. Finite element analyses (FEA) were then conducted on the FRP strengthened steel beams. By incorporating the proposed Bond Failure model into the FEA, the equivalent strain energy density in the Bondline was calculated for Bond strength prediction. The validity of the model is assessed by comparing the Bond strengths obtained from numerical analyses against the experimental results. The advantages of this model are proven by comparing its results against those predicted by the maximum value based model. Finally, a parametric study was conducted to investigate the effects of the thickness of FRP laminate, the tensile modulus of FRP laminate, the thickness of epoxy adhesive and the Bond length on Bond strength.

  • Bond Failure of steel beams strengthened with FRP laminates – Part 2: Verification
    Composites Part B-engineering, 2011
    Co-Authors: Y Yu, S P Chiew
    Abstract:

    The application of the new Bond Failure model developed in Part 1 to predict the Bond Failure load of fiber reinforced polymer (FRP) strengthened steel beam is presented in this paper. Full-scale experiments on FRP strengthened steel beams under four-point bending were first carried out. The effects of different strengthening parameters including laminate thickness, Bond length and adhesive thickness on the Bond strength were investigated experimentally. Finite element analyses (FEA) were then conducted on the FRP strengthened steel beams. By incorporating the proposed Bond Failure model into the FEA, the equivalent strain energy density in the Bondline was calculated for Bond strength prediction. The validity of the model is assessed by comparing the Bond strengths obtained from numerical analyses against the experimental results. The advantages of this model are proven by comparing its results against those predicted by the maximum value based model. Finally, a parametric study was conducted to investigate the effects of the thickness of FRP laminate, the tensile modulus of FRP laminate, the thickness of epoxy adhesive and the Bond length on Bond strength.

S P Chiew - One of the best experts on this subject based on the ideXlab platform.

  • Bond Failure of steel beams strengthened with frp laminates part 1 model development
    Composites Part B-engineering, 2011
    Co-Authors: S P Chiew, Y Yu
    Abstract:

    To strengthen deteriorated steel structures, Bonding fiber reinforced polymer (FRP) laminate applied externally to the steel surface is a promising method. For FRP strengthened steel structures, the Bond performance between the FRP laminate and the steel structure is a crucial consideration which will directly influence strengthening effect and determine the final capacity of the strengthened structures. To investigate the Bond Failure mechanism of FRP Bonded steel structures, experiments on three types of FRP-steel joints were conducted. The Bond strengths of different configuration joints were found out. Besides the experimental investigation, finite element analyses were also carried out to study in detail the stress and strain distributions along the Bondline. It was found that the most important factors that influence the final Bond Failure is the stress concentration at the end of the Bondline. After analyzing the mechanism of Bond Failure, a Bond Failure model based on the Failure criterion of equivalent strain energy density was proposed.

  • Bond Failure of steel beams strengthened with FRP laminates – Part 1: Model development
    Composites Part B-engineering, 2011
    Co-Authors: S P Chiew, Y Yu
    Abstract:

    To strengthen deteriorated steel structures, Bonding fiber reinforced polymer (FRP) laminate applied externally to the steel surface is a promising method. For FRP strengthened steel structures, the Bond performance between the FRP laminate and the steel structure is a crucial consideration which will directly influence strengthening effect and determine the final capacity of the strengthened structures. To investigate the Bond Failure mechanism of FRP Bonded steel structures, experiments on three types of FRP-steel joints were conducted. The Bond strengths of different configuration joints were found out. Besides the experimental investigation, finite element analyses were also carried out to study in detail the stress and strain distributions along the Bondline. It was found that the most important factors that influence the final Bond Failure is the stress concentration at the end of the Bondline. After analyzing the mechanism of Bond Failure, a Bond Failure model based on the Failure criterion of equivalent strain energy density was proposed.

  • Bond Failure of steel beams strengthened with frp laminates part 2 verification
    Composites Part B-engineering, 2011
    Co-Authors: Y Yu, S P Chiew
    Abstract:

    The application of the new Bond Failure model developed in Part 1 to predict the Bond Failure load of fiber reinforced polymer (FRP) strengthened steel beam is presented in this paper. Full-scale experiments on FRP strengthened steel beams under four-point bending were first carried out. The effects of different strengthening parameters including laminate thickness, Bond length and adhesive thickness on the Bond strength were investigated experimentally. Finite element analyses (FEA) were then conducted on the FRP strengthened steel beams. By incorporating the proposed Bond Failure model into the FEA, the equivalent strain energy density in the Bondline was calculated for Bond strength prediction. The validity of the model is assessed by comparing the Bond strengths obtained from numerical analyses against the experimental results. The advantages of this model are proven by comparing its results against those predicted by the maximum value based model. Finally, a parametric study was conducted to investigate the effects of the thickness of FRP laminate, the tensile modulus of FRP laminate, the thickness of epoxy adhesive and the Bond length on Bond strength.

  • Bond Failure of steel beams strengthened with FRP laminates – Part 2: Verification
    Composites Part B-engineering, 2011
    Co-Authors: Y Yu, S P Chiew
    Abstract:

    The application of the new Bond Failure model developed in Part 1 to predict the Bond Failure load of fiber reinforced polymer (FRP) strengthened steel beam is presented in this paper. Full-scale experiments on FRP strengthened steel beams under four-point bending were first carried out. The effects of different strengthening parameters including laminate thickness, Bond length and adhesive thickness on the Bond strength were investigated experimentally. Finite element analyses (FEA) were then conducted on the FRP strengthened steel beams. By incorporating the proposed Bond Failure model into the FEA, the equivalent strain energy density in the Bondline was calculated for Bond strength prediction. The validity of the model is assessed by comparing the Bond strengths obtained from numerical analyses against the experimental results. The advantages of this model are proven by comparing its results against those predicted by the maximum value based model. Finally, a parametric study was conducted to investigate the effects of the thickness of FRP laminate, the tensile modulus of FRP laminate, the thickness of epoxy adhesive and the Bond length on Bond strength.

Reza Asadpour - One of the best experts on this subject based on the ideXlab platform.

  • Electrical Signatures of Corrosion and Solder Bond Failure in c-Si Solar Cells and Modules
    IEEE Journal of Photovoltaics, 2019
    Co-Authors: Reza Asadpour, Muhammad Ashraful Alam
    Abstract:

    Moisture- and temperature-activated corrosion of metal fingers, mechanical stress induced delamination, and Failure of solder Bonds rank among the leading Failure mechanisms of solar modules. The physics of moisture ingress, diffusion, and reaction have been explored in detail, but the electrical implications of corrosion and delamination on specific front-surface grid geometry is not fully understood. In this paper, we show that the module efficiency loss due to corrosion, delamination and solder Bond Failure (CDS) involves a complex interplay of voltage/current redistribution, reflected as a loss in photocurrent, as well as decrease/increase in shunt/series resistances. The analysis presented in this paper will redefine the interpretation of experimental I-V characteristic features due to degradation mechanisms, integrate a variety of scattered and counter-intuitive experimental results within a common theoretical framework, and inform CDS-resistant grid design for solar modules.

  • electrical signatures of corrosion and solder Bond Failure in c si solar cells and modules
    arXiv: Applied Physics, 2018
    Co-Authors: Reza Asadpour, Muhammad Ashraful Alam
    Abstract:

    Moisture- and temperature-activated corrosion of metal fingers, mechanical stress induced delamination, and Failure of solder Bonds rank among the leading Failure mechanisms of solar modules. The physics of moisture ingress, diffusion and reaction have been explored in detail, but the electrical implications of corrosion and delamination on specific front-surface grid geometry is not fully understood. In this paper, we show that the module efficiency loss due to corrosion, delamination, and solder Bond Failure (CDS) involves a complex interplay of voltage/current redistribution, reflected as a loss in photocurrent as well as decrease/increase in shunt/series resistances. Our work will redefine the interpretation of experimental J-V characteristics features due to degradation mechanisms, integrate a variety of scattered and counter-intuitive experimental results within a common theoretical framework, and inform CDS-resistant grid design for solar modules.

Leonard E Braitman - One of the best experts on this subject based on the ideXlab platform.

  • in vivo prospective comparison of Bond Failure rates of 2 self etching primer adhesive systems
    American Journal of Orthodontics and Dentofacial Orthopedics, 2007
    Co-Authors: Anthony Pasquale, Martin Weinstein, Alan J Borislow, Leonard E Braitman
    Abstract:

    Introduction: The purpose of this study was to comparatively assess the Bond Failure rates of orthodontic brackets Bonded with 2 self-etching primer (SEP) Bonding systems over an 18-month period. Methods: Thirty-six consecutively treated orthodontic patients were Bonded with TransBond Plus SEP with TransBond XT adhesive (3M Unitek, Monrovia, Calif) and with Ideal 1 SEP with Ideal 1 adhesive (GAC International, Bohemia, NY). In each patient, the teeth were divided into 2 groups based on the universal numbering system (1-32). All even-numbered teeth (340) were Bonded with the TransBond system, and all odd-numbered teeth (340) were Bonded with the Ideal 1 system. A total of 680 teeth were Bonded and followed for a minimum of 18 months. Results: The average percentages of Bond Failures were 12.4% and 4.1% in the teeth treated with Ideal 1 and TransBond Plus, respectively ( P Conclusions: Because the Bond Failure rate with the TransBond Plus SEP system was one third that of the Ideal 1 SEP system, TransBond Plus appears to be a better choice for routine orthodontic clinical practices.

  • in vivo prospective comparison of Bond Failure rates of 2 self etching primer adhesive systems
    American Journal of Orthodontics and Dentofacial Orthopedics, 2007
    Co-Authors: Anthony Pasquale, Martin Weinstein, Alan J Borislow, Leonard E Braitman
    Abstract:

    INTRODUCTION: The purpose of this study was to comparatively assess the Bond Failure rates of orthodontic brackets Bonded with 2 self-etching primer (SEP) Bonding systems over an 18-month period. METHODS: Thirty-six consecutively treated orthodontic patients were Bonded with TransBond Plus SEP with TransBond XT adhesive (3M Unitek, Monrovia, Calif) and with Ideal 1 SEP with Ideal 1 adhesive (GAC International, Bohemia, NY). In each patient, the teeth were divided into 2 groups based on the universal numbering system (1-32). All even-numbered teeth (340) were Bonded with the TransBond system, and all odd-numbered teeth (340) were Bonded with the Ideal 1 system. A total of 680 teeth were Bonded and followed for a minimum of 18 months. RESULTS: The average percentages of Bond Failures were 12.4% and 4.1% in the teeth treated with Ideal 1 and TransBond Plus, respectively (P<.001), for a difference of 8.4 percentage points (95% CI, 4.2 to 12.6 percentage points). CONCLUSIONS: Because the Bond Failure rate with the TransBond Plus SEP system was one third that of the Ideal 1 SEP system, TransBond Plus appears to be a better choice for routine orthodontic clinical practices.

  • In-vivo prospective comparison of Bond Failure rates of 2 self-etching primer/adhesive systems
    American Journal of Orthodontics and Dentofacial Orthopedics, 2007
    Co-Authors: Anthony Pasquale, Martin Weinstein, Alan J Borislow, Leonard E Braitman
    Abstract:

    INTRODUCTION: The purpose of this study was to comparatively assess the Bond Failure rates of orthodontic brackets Bonded with 2 self-etching primer (SEP) Bonding systems over an 18-month period. METHODS: Thirty-six consecutively treated orthodontic patients were Bonded with TransBond Plus SEP with TransBond XT adhesive (3M Unitek, Monrovia, Calif) and with Ideal 1 SEP with Ideal 1 adhesive (GAC International, Bohemia, NY). In each patient, the teeth were divided into 2 groups based on the universal numbering system (1-32). All even-numbered teeth (340) were Bonded with the TransBond system, and all odd-numbered teeth (340) were Bonded with the Ideal 1 system. A total of 680 teeth were Bonded and followed for a minimum of 18 months. RESULTS: The average percentages of Bond Failures were 12.4% and 4.1% in the teeth treated with Ideal 1 and TransBond Plus, respectively (P

  • Bond Failure and decalcification: a comparison of a cyanoacrylate and a composite resin Bonding system in vivo
    American Journal of Orthodontics and Dentofacial Orthopedics, 2003
    Co-Authors: Phu T Le, Martin Weinstein, Alan J Borislow, Leonard E Braitman
    Abstract:

    This prospective, in vivo study compared Bond Failure and enamel decalcification with a cyanoacrylate bracket Bonding system (SmartBond, Gestenco International, Gothenburg, Sweden) and a traditional light-cured composite system (Light Bond, Reliance Orthodontic Products, Itasca, Ill). A total of 327 teeth were evaluated after a period of 12 to 14 months; 163 experimental teeth were Bonded with the cyanoacrylate Bonding system, and 164 control teeth were Bonded with the light-cured composite resin. All teeth were evaluated for breakage (Bond Failure). The average percentage of bracket Failures with cyanoacrylate was 55.6% compared with 11.3% with composite resin (P < .001). All maxillary anterior teeth (94) were evaluated for enamel decalcification on a graded scale. Occurrence of enamel decalcification between the 2 Bonding systems after 1 year of orthodontic treatment was similar. The cyanoacrylate Bonding material had more than 4 times as many Bond Failures and a similar amount of decalcification as the traditional composite material. Cyanoacrylate as a routine orthodontic Bonding agent is not a suitable Bonding material for clinical practice at this time. It is important to test new Bonding systems in vivo in several studies before using them in routine clinical practice.