The Experts below are selected from a list of 69 Experts worldwide ranked by ideXlab platform

Th.b. Kermanidis - One of the best experts on this subject based on the ideXlab platform.

  • Strength prediction of bolted joints in graphite/epoxy composite laminates
    Composites Part B-engineering, 2002
    Co-Authors: Konstantinos Tserpes, Paraskevas Papanikos, George N. Labeas, Th.b. Kermanidis
    Abstract:

    Abstract A parametric finite element analysis was conducted to investigate the effect of Failure criteria and material property degradation rules on the tensile behaviour and strength of bolted joints in graphite/epoxy composite laminates. The analysis was based on a three-dimensional progressive damage model (PDM) developed earlier by the authors. The PDM comprises the components of stress analysis, Failure analysis and material property degradation. The Predicted Load–displacement curves and Failure Loads of a single-lap single-bolt joint were compared with experimental data for different joint geometries and laminate stacking sequences. The stiffness of the joint was Predicted with satisfactory accuracy for all configurations. The Predicted Failure Load was significantly influenced by the combination of Failure criteria and degradation rules used. A combination of Failure criteria and material property degradation rules that leads to accurate strength prediction is proposed. For all the analyses performed, the macroscopic Failure mechanism of the joint and the damage progression were also Predicted.

Hong Suk Chang - One of the best experts on this subject based on the ideXlab platform.

  • Failure Load prediction of composite bolted joint with clamping force
    Composite Structures, 2018
    Co-Authors: Jae Il Choi, Seyyed Mohammad Hasheminia, Jong Chan Park, Heoung Jae Chun, Hong Suk Chang
    Abstract:

    Abstract Clamping force significantly affects the Failure mechanisms of bolted joints. In order to predict the Failure Load of bolted joints, the effect of clamping force must be considered. In this paper, Failure Load prediction for composite joints with clamping force was conducted using a characteristic length method combined with Tsai-Wu Failure criteria. Tensile and bearing tests and stress analyses were conducted to determine tensile and compressive characteristic lengths. A characteristic curve was used to perform Failure Load prediction for single lap-shear bolted joints. This prediction was accompanied by experiments and stress analysis. The Predicted Failure Load was compared with the actual Failure obtained from experiments, and the results were found to be in good agreement.

Konstantinos Tserpes - One of the best experts on this subject based on the ideXlab platform.

  • Strength prediction of bolted joints in graphite/epoxy composite laminates
    Composites Part B-engineering, 2002
    Co-Authors: Konstantinos Tserpes, Paraskevas Papanikos, George N. Labeas, Th.b. Kermanidis
    Abstract:

    Abstract A parametric finite element analysis was conducted to investigate the effect of Failure criteria and material property degradation rules on the tensile behaviour and strength of bolted joints in graphite/epoxy composite laminates. The analysis was based on a three-dimensional progressive damage model (PDM) developed earlier by the authors. The PDM comprises the components of stress analysis, Failure analysis and material property degradation. The Predicted Load–displacement curves and Failure Loads of a single-lap single-bolt joint were compared with experimental data for different joint geometries and laminate stacking sequences. The stiffness of the joint was Predicted with satisfactory accuracy for all configurations. The Predicted Failure Load was significantly influenced by the combination of Failure criteria and degradation rules used. A combination of Failure criteria and material property degradation rules that leads to accurate strength prediction is proposed. For all the analyses performed, the macroscopic Failure mechanism of the joint and the damage progression were also Predicted.

Jun Hwan Shin - One of the best experts on this subject based on the ideXlab platform.

  • Novel Approach of Predicting Fracture Load in the Human Proximal Femur Using Non-Invasive QCT Imaging Technique
    Annals of Biomedical Engineering, 2009
    Co-Authors: Taeyong Lee, Barry P. Pereira, Yoon-sok Chung, Jae Bong Choi, Dohyung Lim, Jun Hwan Shin
    Abstract:

    This paper presents an analysis of predicting the Load-bearing capacities of human femurs using quantitative computer tomography (QCT)-based beam theory. Cross-sectional images of 12 human cadaver femurs (intact bones, age: 39–77 years; male = 8, female = 4) were scanned in conjunction with a calcium hydroxyapatite phantom which has five chambers of known densities. The apparent densities obtained from the scans were used to evaluate the Young’s modulus ( E ) by applying the established empirical relationships. The fracture Load of a configuration that simulated single-legged stance was measured experimentally and compared with the Predicted Failure Load using a composite beam theory, plane stress model of the femur. In this model, the Failure was assumed to occur at the weakest cross-section through the bone determined from QCT-based structural analysis. In contrast to the other experimental investigations, the setup used in this study considers the entire length of a human femur and also incorporates a novel mechanical jig to mimic the realistic physiological scenario. In one of our earlier studies, simulated lytic defects of varying size were created at the inter-trochanteric region of femurs and their Load-bearing capacities were calculated based on their structural properties. Both the results obtained from the current study as well as the ones from our previous study were used to assess the viability of the methodology. A high degree of correlation was observed when the Predicted Failure Loads obtained from the intact femurs and previously studied defective femurs were compared with the ex vivo fracture Loads. The coefficients of determination ( R ^2) of QCT-derived Predicted Loads with respect to the measured Failure Loads were 0.80 for the intact femurs and 0.87 for the defective femurs. The results suggest that the QCT-derived beam analysis provides a viable approach for the assessment of Load-bearing capacity in various clinical scenarios.

Ming Zhang - One of the best experts on this subject based on the ideXlab platform.

  • A method for predicting Failure Load of masonry wall panel based on structural stress state
    Engineering review, 2020
    Co-Authors: Yanxia Huang, Qunyi Huang, Liang Cui, Keyue Zhang, Ming Zhang
    Abstract:

    This paper proposed a method for predicting the Failure Loads of masonry wall panels subject to uniformly distributed lateral Loading based on a concept of structural stress state. Firstly, the characteristics of the structural stress state of masonry wall panels subjected to uniform distributed lateral Loading were investigated through experimental results. Then, a new parameter was proposed to characterize the structural stress state. Next, the relation of the Failure Loads between a specified base wall panels and other wall panel was established using the proposed parameter. In this way, a method (called as stress state (ST) method) based on structural stress state parameter to predict the Failure Load of masonry wall panel from the base wall panel was established. The following case studies validated the ST method by comparing the Predicted Failure Load with experimental results as well as those Predicted from the existing yield line theory(YLT), the FEA method and the GSED-based cellular automata (CA) method. The ST method provided an innovative way of structural analysis on the basis of structural stress state.