The Experts below are selected from a list of 14136 Experts worldwide ranked by ideXlab platform
Songhe Meng - One of the best experts on this subject based on the ideXlab platform.
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modified double Notched Specimen for ultra high temperatures shear strength testing of carbon carbon composites
Journal of The European Ceramic Society, 2019Co-Authors: Songhe Meng, Hua Jin, Xinxing Han, Weihua XieAbstract:Abstract In this paper, a modified double-Notched Specimen (MDNS) is proposed to investigate shear strength of carbon/carbon composites at ultra-high temperatures. The effects of surplus notch length on distribution of shear stress in the gauge area are studied using finite element method. Both standard Iosipescu method and the MDNS method are used to test shear strength of 3D needled, 3D woven, and 4D woven C/C composites at room temperature. The results are in good agreement with each other. Uniform shear strain is observed using digital image correlation (DIC) technology to confirm the proposed method. Additionally, the shear strength of these three types C/C composites are measured at 2000 °C, 2400 °C, and 2800 °C using the designed testing system. The temperature field at 2000 °C is measured using a thermal imaging system to demonstrate uniform distribution of temperature. The failure mechanisms at ultra-high temperatures are also characterized via optical microscopy.
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experimental study of ultra high temperature interlaminar tensile strengths of 3d needled c c composites using the v shaped Notched Specimen compression method
Mechanics of Materials, 2018Co-Authors: Chenghai Xu, Guangyi Cheng, Songhe MengAbstract:Abstract In this work, interlaminar tensile (ILT) strengths and microscopic failure mechanisms of 3D needled C/C composites were studied at ultra-high temperatures (up to 2800 °C). Experiments were conducted using the V-shaped Notched Specimen compression method. The measured ILT strengths compared favorably to results obtained via flatwise tension and diametral compression tests. In addition, the high-temperature transverse displacement field was measured using digital image correlation and the temperature field was measured using an infrared thermal imager. The transverse displacement and temperature fields were uniform in the gage section. The results confirm the effectiveness of this method for measurements of 3D needled C/C composites. The ILT strengths of the 3D needled C/C composites were measured at 1200 °C, 1600 °C, 1800 °C, 2000 °C, 2400 °C, and 2800 °C. The ILT strengths increased with the temperature up to 1600 °C, and then decreased in the 1600–2800 °C range. The failure mechanisms were investigated via optical microscopy. The needling fibers were pulled out, which indicates that the ILT strengths were primarily dependent on interfacial strength. It is intended that these results will provide some practical guidelines for ultra-high temperature engineering applications.
Weida Yao - One of the best experts on this subject based on the ideXlab platform.
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Corrosion fatigue behavior of 304 stainless steel Notched Specimen in high-temperature pressurized water
Materials Science and Engineering: A, 2019Co-Authors: Jiapeng Liao, Jibo Tan, Dong Ning, Guohong Xue, Weida YaoAbstract:Abstract Fatigue behavior of 304 stainless steel Notched Specimen was investigated in room-temperature (RT) air, 280 °C and 325 °C pressurized water at varying average strain rates. Fatigue life of the Notched Specimen in RT air is longer than that of the smooth Specimen due to the stress gradient on the section of notch root. Fatigue life of the Notched Specimen in 325 °C water is longer than that in 280 °C water due to the combination of different corrosion rates and dynamic strain aging at different water temperatures.
Matthew J Peel - One of the best experts on this subject based on the ideXlab platform.
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in situ crack growth studies of hydrided zircaloy 4 on a single edge Notched tensile Specimen
Scripta Materialia, 2009Co-Authors: Axel Steuwer, John E Daniels, Matthew J PeelAbstract:The strains in matrix and hydrides around a fatigue crack tip grown in situ in a single-edge Notched Specimen of hydrided Zircaloy-4 have been determined using synchrotron X-ray diffraction at various stages of loading. The hydride phase shows proportionally larger strains at full load compared to the matrix strain. The residual strains of the matrix ahead of the crack tip reveal the reverse plastic zone for a crack grown in tension, while the hydride residual strains remain strongly tensile. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Weihua Xie - One of the best experts on this subject based on the ideXlab platform.
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modified double Notched Specimen for ultra high temperatures shear strength testing of carbon carbon composites
Journal of The European Ceramic Society, 2019Co-Authors: Songhe Meng, Hua Jin, Xinxing Han, Weihua XieAbstract:Abstract In this paper, a modified double-Notched Specimen (MDNS) is proposed to investigate shear strength of carbon/carbon composites at ultra-high temperatures. The effects of surplus notch length on distribution of shear stress in the gauge area are studied using finite element method. Both standard Iosipescu method and the MDNS method are used to test shear strength of 3D needled, 3D woven, and 4D woven C/C composites at room temperature. The results are in good agreement with each other. Uniform shear strain is observed using digital image correlation (DIC) technology to confirm the proposed method. Additionally, the shear strength of these three types C/C composites are measured at 2000 °C, 2400 °C, and 2800 °C using the designed testing system. The temperature field at 2000 °C is measured using a thermal imaging system to demonstrate uniform distribution of temperature. The failure mechanisms at ultra-high temperatures are also characterized via optical microscopy.
Jiapeng Liao - One of the best experts on this subject based on the ideXlab platform.
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Corrosion fatigue behavior of 304 stainless steel Notched Specimen in high-temperature pressurized water
Materials Science and Engineering: A, 2019Co-Authors: Jiapeng Liao, Jibo Tan, Dong Ning, Guohong Xue, Weida YaoAbstract:Abstract Fatigue behavior of 304 stainless steel Notched Specimen was investigated in room-temperature (RT) air, 280 °C and 325 °C pressurized water at varying average strain rates. Fatigue life of the Notched Specimen in RT air is longer than that of the smooth Specimen due to the stress gradient on the section of notch root. Fatigue life of the Notched Specimen in 325 °C water is longer than that in 280 °C water due to the combination of different corrosion rates and dynamic strain aging at different water temperatures.
