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  • Open Access


    Mechanical Properties and Fire Retardancy of Wood Flour/High-Density Polyethylene Composites Reinforced with Continuous Honeycomb-Like Nano-SiO2 Network and Fire Retardant

    Haiyang Zhou1,2, Xiaoyu Wang3, Xiaolong Hao1,2, Qingwen Wang1,2,*, Rongxian Ou1,2,*

    Journal of Renewable Materials, Vol.8, No.5, pp. 485-498, 2020, DOI:10.32604/jrm.2020.010263

    Abstract The mechanical properties of wood flour/high-density polyethylene composites (WPC) were improved by adding a small amount of nano-SiO2 to obtain a network-structured WPC with a continuous honeycomb-like nano-SiO2 network. The wood flour was modified with a fire retardant (a mixture of sodium octabonate and amidine urea phosphate) to improve its fire retardancy. The flexural properties, creep resistance, thermal expansion, and fire retardancy of the WPC were compared to a control (WPCCTRL) without nano-SiO2 or fire retardant. The flexural strength and modulus of the WPC containing only 0.55 wt.% nano-SiO2 were 6.6% and 9.1% higher than the control, respectively, while the… More >

  • Open Access


    Experimental Study on the Creep Behavior of Recombinant Bamboo

    Yang Wei*, Kunpeng Zhao, Chen Hang, Si Chen, Mingmin Ding

    Journal of Renewable Materials, Vol.8, No.3, pp. 251-273, 2020, DOI:10.32604/jrm.2020.08779

    Abstract The creep behavior of bamboo due to the complicated influences of environment and stress will lead to a sustained increase in deformation, which serious effects the service performance of structures. To investigate the creep behavior of recombinant bamboo, twenty-four recombinant bamboo specimens were tested under lasting compressive and tensile loads at different load levels. The typical failure modes of recombinant bamboo under a lasting load at a high load level were buckling failure and brittle fracturing due to creep compressive creep and tensile creep development, respectively. At a high load level, the creep deformation of recombinant bamboo initially develops unsteadily… More >

  • Open Access


    Role of Residual Stress in Structural Integrity Assessment of Cracked Components at Elevated Temperatures

    Kamran Nikbin1

    Structural Durability & Health Monitoring, Vol.3, No.1, pp. 51-68, 2007, DOI:10.3970/sdhm.2007.003.051

    Abstract Weldments and welded regions of components are likely to see failure at elevated temperatures earlier than homogenous parent material. In some cases variable loading could also introduce creep/fatigue crack growth. These weld regions not only contain variable creep properties but are likely to contain residual stresses which could relax in time. There are three key factors which may determine a successful outcome for remaining life assessment of engineering components containing residual stresses in the vicinity of welds. The first is standardized testing and measurement procedures. The second is the development of appropriate and accurate correlating parameters to treat the results… More >

  • Open Access


    A Strain Energy Density Rate Approach to the BEM Analysis of Creep Fracture Problems

    C.P. Providakis1

    Structural Durability & Health Monitoring, Vol.2, No.4, pp. 249-254, 2006, DOI:10.3970/sdhm.2006.002.249

    Abstract This paper explores the concept of strain energy density rate in relation to the crack initiation in fracture analysis problems arising in creeping cracked structural components. The analysis of the components is performed by using the boundary element methodology in association with the employment of singular boundary elements for the modeling of the crack tip region. The deformation of the material is assumed to be described by an elastic power law creep model. The strain energy density rate theory is applied to determine the direction of the crack initiation for a center cracked plate in tension which is subjected to… More >

  • Open Access


    Effect of Temperature and Creep on Roller Compacted Concrete Dam During the Construction Stages

    A. A. Abdulrazeg1, J. Noorzaei1,2, P. Khanehzaei1, M. S. Jaafar1, T. A. Mohammed1

    CMES-Computer Modeling in Engineering & Sciences, Vol.68, No.3, pp. 239-268, 2010, DOI:10.3970/cmes.2010.068.239

    Abstract Development of temperature rise in massive concrete structure such as a roller compacted concrete dam is attributed to hydration of concrete and environmental boundary conditions. These thermal changes in the material affect the elastic, creep properties of the material, and in turn, the stress fields within the structure. Therefore, the effects of temperature on the properties of RCC materials( elastic, creep) has to be taken into account in order to determine the risk of the thermally induced cracking in these dams. In the present work an attempt has been made to consider the effect of temperature on the elastic and… More >

  • Open Access



    Jiang-teng LI, Ping CAO, Hang LIN, Xiang-yang ZHANG

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.20, No.4, pp. 109-110, 2011, DOI:10.3970/icces.2011.020.109

    Abstract Rock will be soften and weakened its physics mechanics parameters by water, then resulting in the deterioration of stability of geotechnical engineering. The effects of water on creep damage parameters of rock become more distinct for pore water dissipation with time passing. So it is important to study the damage parameters by creep effect under the water-saturated condition.

    In the present paper, a set of uniaxial compression creep experiments of plagioclase specimens were performed under dry and water-saturated in Jinchuan Mine a.! by a circular increment step load and unload method using RYL-600 Shear Rheometer. Creep experiment curves were… More >

  • Open Access


    Universal Framework of Bayesian Creep Model Selection for Steel

    Yoh-ichi Mototake1, Hitoshi Izuno2, Kenji Nagata3,4, Masahiko Demura2 , Masato Okada1,2,*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.2, pp. 129-130, 2019, DOI:10.32604/icces.2019.05389

    Abstract The creep deformation process is constructed by complex interactions of multiple factors, and the measurement of creep deformation requires enormous economic costs and a long experimental time, so there is a small amount of measurement data. In such a situation, multiple models are often proposed to explain the same experimental data. The coexistence of multiple models based on different physical assumptions makes it difficult to understand the creep deformation process.
    The purpose of this study is to construct a framework to compare and evaluate coexistence models based on measurement data using the Bayesian model selection framework. Basically, in the… More >

  • Open Access


    Descriptor Extraction on Inherent Creep Strength of Carbon Steels by Exhaustive Search

    Junya Sakurai1, Junya Inoue2,3,4, Masahiko Demura4,*, Yoichi Mototake5, Masato Okada4,5, Masayoshi Yamazaki4

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.2, pp. 128-128, 2019, DOI:10.32604/icces.2019.05408

    Abstract According to the inherent creep strength concept proposed by Kimura et al., microstructural strengthening effect is expiring after a long-term creep deformation at high temperature. In the region, the solid solution hardening effect becomes dominant so that the rupture time is expected to be a simple function of chemical composition and test conditions. In fact, they found that there was a linear relationship between logarithm rupture time and the amount of Mo for the carbon steel JIS STB410. They also found the positive correlations of Cr and Mn to the logarithmic rupture time. However, it is difficult to specify the… More >

  • Open Access


    Machine Learning Prediction of Creep Rupture Time for Steels

    Masahiko Demura1,*, Junya Sakurai1,2, Masayoshi Yamazaki1, Junya Inoue1,2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.2, pp. 123-123, 2019, DOI:10.32604/icces.2019.05303

    Abstract Creep is a complicated and time-dependent phenomenon, which is affected by the initial state and the degradation of microstructures. It is thus considered that the information about the microstructure is essential to predict the creep rupture time. On the other hand, there is a strong, practical need for the prediction without the investigation of microstructures nor the disclosure of the detailed process that should control the initial microstructures. In this study, we examined how modern machine learning technique can help to predict the creep rupture time in heat-resistant ferrite-type steels without the direct information about the microstructures and the process… More >

  • Open Access


    Creep Model Selection for Grade 91 Steel Using Data Scientific Method

    Hitoshi Izuno1, Masahiko Demura1,*, Masaaki Tabuchi2, Yohichi Mototake3, Masato Okada1,3

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.22, No.2, pp. 121-121, 2019, DOI:10.32604/icces.2019.05270

    Abstract An accurate creep deformation model is needed for detailed description of creep behavior of high temperature structural materials, e.g., Grade 91 steels used in boiler tubes of thermal power plants. Two types of creep constitutive equations are known, as follows: the one, e.g., modified theta method, assumes the existence of a steady state; and the other, e.g., theta method, does not. So far, both types have been selected on a case by case basis and there is no consensus on whether or not the steady state should be assumed even if limited in the Grade 91 steels. In this study,… More >

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