The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform

Duan Bao - One of the best experts on this subject based on the ideXlab platform.

  • state of the art and prospect of rtm technique of Advanced Composite Structure
    Journal of Shenyang Institute of Aeronautcal Engineering, 2000
    Co-Authors: Duan Bao
    Abstract:

    Considerable amount of work has been carried out on the development of resin transfer molding(RTM)as a viable processing alternative to autoclaving molding techniques .RTM has the capability of producing high quality components of complex shape with lower cost.This paper reviews the recent RTM advances in material,equipment and applications in the aerospace industry.It also gives a general description of the process of RTM and flow model.

Wieslaw Ostachowicz - One of the best experts on this subject based on the ideXlab platform.

  • nondestructive analysis of core junction and joint debond effects in Advanced Composite Structure
    Polymer Testing, 2019
    Co-Authors: Shirsendu Sikdar, Wieslaw Ostachowicz
    Abstract:

    Abstract This paper presents a theoretical, numerical and experimental analysis of Lamb wave propagation and joint-debond identification in an Advanced Composite Structure with core-junction. In the process, the wave modes in the recorded sensor-signals are effectively identified based on the theoretically obtained time-history response and dispersion curves for the sample Structure. In order to study the core-junction and joint-debond effects, the finite element based numerical simulations were carried out in ABAQUS and the results verified with laboratory experiments. It was observed that the presence of core-junction in the Structure reduces the propagating Lamb wave mode amplitudes, whereas the presence of localized joint-debond significantly increases the modal amplitudes. The study was further extended for the analysis of variable core-junction thickness and joint-debond size effects on the amplitude difference between the baseline and affected Lamb wave signals. Finally, a baseline-free debond detection strategy is proposed for the detection of hidden joint-debond locations in the target Structure.

M G Riskalla - One of the best experts on this subject based on the ideXlab platform.

  • probabilistic design of Advanced Composite Structure
    FAA Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design Volume 1, 1992
    Co-Authors: P M Gray, M G Riskalla
    Abstract:

    Advanced Composite technology offers potentials for sizable improvements in many areas: weight savings, maintainability, durability, and reliability. However, there are a number of inhibitors to these improvements. One of the biggest inhibitors is the imposition of traditional metallic approaches to design of Composite Structure. This is especially detrimental in Composites because new materials technology demands new design approaches. Of particular importance are the decisions made regarding structural criteria. Significant changes cannot be implemented without careful consideration and exploration. This new approach is to implement changes on a controlled, verifiable basis. Probabilistic design is the methodology and the process to accomplish this. Its foundation is to base design criteria and objectives on reliability targets instead of arbitrary factors carried over from metallic structural history. The background is discussed of probabilistic design and the results are presented of a side-by-side comparison to generic aircraft Structure designed the 'old' way and the 'new'. Activities are also defined that need to be undertaken to evolve available approaches to probabilistic design followed by summary and recommendations.

Shirsendu Sikdar - One of the best experts on this subject based on the ideXlab platform.

  • nondestructive analysis of core junction and joint debond effects in Advanced Composite Structure
    Polymer Testing, 2019
    Co-Authors: Shirsendu Sikdar, Wieslaw Ostachowicz
    Abstract:

    Abstract This paper presents a theoretical, numerical and experimental analysis of Lamb wave propagation and joint-debond identification in an Advanced Composite Structure with core-junction. In the process, the wave modes in the recorded sensor-signals are effectively identified based on the theoretically obtained time-history response and dispersion curves for the sample Structure. In order to study the core-junction and joint-debond effects, the finite element based numerical simulations were carried out in ABAQUS and the results verified with laboratory experiments. It was observed that the presence of core-junction in the Structure reduces the propagating Lamb wave mode amplitudes, whereas the presence of localized joint-debond significantly increases the modal amplitudes. The study was further extended for the analysis of variable core-junction thickness and joint-debond size effects on the amplitude difference between the baseline and affected Lamb wave signals. Finally, a baseline-free debond detection strategy is proposed for the detection of hidden joint-debond locations in the target Structure.

P M Gray - One of the best experts on this subject based on the ideXlab platform.

  • probabilistic design of Advanced Composite Structure
    FAA Ninth DOD(NASA)FAA Conference on Fibrous Composites in Structural Design Volume 1, 1992
    Co-Authors: P M Gray, M G Riskalla
    Abstract:

    Advanced Composite technology offers potentials for sizable improvements in many areas: weight savings, maintainability, durability, and reliability. However, there are a number of inhibitors to these improvements. One of the biggest inhibitors is the imposition of traditional metallic approaches to design of Composite Structure. This is especially detrimental in Composites because new materials technology demands new design approaches. Of particular importance are the decisions made regarding structural criteria. Significant changes cannot be implemented without careful consideration and exploration. This new approach is to implement changes on a controlled, verifiable basis. Probabilistic design is the methodology and the process to accomplish this. Its foundation is to base design criteria and objectives on reliability targets instead of arbitrary factors carried over from metallic structural history. The background is discussed of probabilistic design and the results are presented of a side-by-side comparison to generic aircraft Structure designed the 'old' way and the 'new'. Activities are also defined that need to be undertaken to evolve available approaches to probabilistic design followed by summary and recommendations.