The Experts below are selected from a list of 30 Experts worldwide ranked by ideXlab platform
J. Michael Kabo - One of the best experts on this subject based on the ideXlab platform.
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Determination of mechanical stiffness of bone by pQCT measurements: correlation with non-destructive mechanical four-point bending test data.
Journal of biomechanics, 2004Co-Authors: Daniel E. Martin, Anne E. Severns, J. Michael KaboAbstract:Mechanical tests of bone provide valuable information about material and structural properties important for understanding bone pathology in both clinical and research settings, but no previous studies have produced applicable non-invasive, quantitative estimates of bending stiffness. The goal of this study was to evaluate the effectiveness of using peripheral quantitative computed tomography (pQCT) data to accuRately compute the bending stiffness of bone. Normal rabbit humeri (N=8) were scanned at their mid-diaphyses using pQCT. The average bone mineral densities and the cross-sectional moments of inertia were computed from the pQCT cross-sections. Bending stiffness was determined as a function of the elastic modulus of compact bone (based on the local bone mineral density), cross-sectional moment of inertia, and simulated Quasistatic Strain Rate. The actual bending stiffness of the bones was determined using four-point bending tests. Comparison of the bending stiffness estimated from the pQCT data and the mechanical bending stiffness revealed excellent correlation (R2=0.96). The bending stiffness from the pQCT data was on average 103% of that obtained from the four-point bending tests. The results indicate that pQCT data can be used to accuRately determine the bending stiffness of normal bone. Possible applications include temporal quantification of fracture healing and risk management of osteoporosis or other bone pathologies.
Fanlu Min - One of the best experts on this subject based on the ideXlab platform.
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Research Article Experimental and Numerical Study on Tensile Strength of Concrete under Different Strain Rates
2016Co-Authors: Fanlu Min, Zhanhu Yao, Teng JiangAbstract:which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The dynamic characterization of concrete is fundamental to understand the material behavior in case of heavy earthquakes and dynamic events. The implementation of material constitutive law is of capital importance for the numerical simulation of the dynamic processes as those caused by earthquakes. Splitting tensile concrete specimens were tested at Strain Rates of 10−7 s−1 to 10−4 s−1 in anMTSmaterial test machine. Results of tensile strength versus Strain Rate are presented and compared with compressive strength and existing models at similar Strain Rates. Dynamic increase factor versus Strain Rate curves for tensile strength were also evaluated and discussed.The same tensile data are compared with strength data using a thermodynamic model. Results of the tests show a significant Strain Rate sensitive behavior, exhibiting dynamic tensile strength increasing with Strain Rate. In the Quasistatic Strain Rate regime, the existing models often underestimate the experimental results. The thermodynamic theory for the splitting tensile strength of concrete satisfactorily describes the experimental findings of strength as effect of Strain Rates. 1
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Experimental and numerical study on tensile strength of concrete under different Strain Rates.
TheScientificWorldJournal, 2014Co-Authors: Fanlu Min, Zhanhu Yao, Jiang TengAbstract:The dynamic characterization of concrete is fundamental to understand the material behavior in case of heavy earthquakes and dynamic events. The implementation of material constitutive law is of capital importance for the numerical simulation of the dynamic processes as those caused by earthquakes. Splitting tensile concrete specimens were tested at Strain Rates of 10−7 s−1 to 10−4 s−1 in an MTS material test machine. Results of tensile strength versus Strain Rate are presented and compared with compressive strength and existing models at similar Strain Rates. Dynamic increase factor versus Strain Rate curves for tensile strength were also evaluated and discussed. The same tensile data are compared with strength data using a thermodynamic model. Results of the tests show a significant Strain Rate sensitive behavior, exhibiting dynamic tensile strength increasing with Strain Rate. In the Quasistatic Strain Rate regime, the existing models often underestimate the experimental results. The thermodynamic theory for the splitting tensile strength of concrete satisfactorily describes the experimental findings of strength as effect of Strain Rates.
Akihisa Inoue - One of the best experts on this subject based on the ideXlab platform.
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Correlation of dynamic and Quasistatic relaxations: The Cox–Merz rule for metallic glass
Applied Physics Letters, 2009Co-Authors: Hidemi Kato, Tetsu Ichitsubo, Hitoshi Igarashi, Akihisa InoueAbstract:The correlation of Quasistatic and dynamic relaxations was discussed in a typical strong Zr55Al10Ni5Cu30 metallic glass from room temperature to Tg. The Quasistatic relaxation behavior, investigated by high temperature compressive testing at a constant Strain Rate, was compared with dynamic tensile relaxation behavior. A correlation equation of the dynamic frequency and Quasistatic Strain Rate was successfully deduced, and then its validity was experimentally confirmed in a fragile metallic glass. Using this correlation, the Cox–Merz rule, derived for correlating the steady-state and dynamic viscosities of the polymers, is found to be applicable to metallic glasses.
Daniel E. Martin - One of the best experts on this subject based on the ideXlab platform.
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Determination of mechanical stiffness of bone by pQCT measurements: correlation with non-destructive mechanical four-point bending test data.
Journal of biomechanics, 2004Co-Authors: Daniel E. Martin, Anne E. Severns, J. Michael KaboAbstract:Mechanical tests of bone provide valuable information about material and structural properties important for understanding bone pathology in both clinical and research settings, but no previous studies have produced applicable non-invasive, quantitative estimates of bending stiffness. The goal of this study was to evaluate the effectiveness of using peripheral quantitative computed tomography (pQCT) data to accuRately compute the bending stiffness of bone. Normal rabbit humeri (N=8) were scanned at their mid-diaphyses using pQCT. The average bone mineral densities and the cross-sectional moments of inertia were computed from the pQCT cross-sections. Bending stiffness was determined as a function of the elastic modulus of compact bone (based on the local bone mineral density), cross-sectional moment of inertia, and simulated Quasistatic Strain Rate. The actual bending stiffness of the bones was determined using four-point bending tests. Comparison of the bending stiffness estimated from the pQCT data and the mechanical bending stiffness revealed excellent correlation (R2=0.96). The bending stiffness from the pQCT data was on average 103% of that obtained from the four-point bending tests. The results indicate that pQCT data can be used to accuRately determine the bending stiffness of normal bone. Possible applications include temporal quantification of fracture healing and risk management of osteoporosis or other bone pathologies.
Jiang Teng - One of the best experts on this subject based on the ideXlab platform.
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Experimental and numerical study on tensile strength of concrete under different Strain Rates.
TheScientificWorldJournal, 2014Co-Authors: Fanlu Min, Zhanhu Yao, Jiang TengAbstract:The dynamic characterization of concrete is fundamental to understand the material behavior in case of heavy earthquakes and dynamic events. The implementation of material constitutive law is of capital importance for the numerical simulation of the dynamic processes as those caused by earthquakes. Splitting tensile concrete specimens were tested at Strain Rates of 10−7 s−1 to 10−4 s−1 in an MTS material test machine. Results of tensile strength versus Strain Rate are presented and compared with compressive strength and existing models at similar Strain Rates. Dynamic increase factor versus Strain Rate curves for tensile strength were also evaluated and discussed. The same tensile data are compared with strength data using a thermodynamic model. Results of the tests show a significant Strain Rate sensitive behavior, exhibiting dynamic tensile strength increasing with Strain Rate. In the Quasistatic Strain Rate regime, the existing models often underestimate the experimental results. The thermodynamic theory for the splitting tensile strength of concrete satisfactorily describes the experimental findings of strength as effect of Strain Rates.
