Effect of Loop Yarns on Mechanical Properties of Carbon Fibre/Epoxy Composites

Mingyang Shao,Deng’an Cai,Nan Zhang,Qihang Yu,Fangtian Hu,Ning Kuang,Guangming Zhou 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10

The general two-dimensional (2D) woven laminated composite (GWLC) is widely used in aviation, aerospace and high speed railways, and its superior specific stiffness and strength substantially reduce the weight of the structural components. However, when the GWLC is damaged by flexural, shear and impact loads, the layers are prone to delamination. To improve the interlayer properties of the GWLC, a loop warp yarn is added to the plain fabric by means of three-dimensional (3D) weaving technology, resulting in a double-side-loop fabric with Z-directional fibers. This paper investigates the double-notched shear (DNS) properties, in-plane shear properties, and flexural properties of GWLC and a new double-side-loop 2D woven laminated composite (DWLC). The test results verify that adding the loop warp yarns can greatly improve the interlayer properties of the general 2D woven laminated composites. The DWLC increases the interlaminar shear strength by 81.5%, the in-plane shear strength by 49.4%, and the flexural strength and modulus by 90.2% and 61.4%, respectively. The excellent mechanical properties of the DWLC lay a foundation for loop fabrics in engineering applications.

Structural Response of an Extra-Wide Concrete Self-Anchored Suspension Bridge under Static Vehicle Loads: Testing and Numerical Simulations

Guangpan Zhou,AiQun Li,Jianhui Li,Mingyang Wang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.4

The finite element (FE) analysis by ANSYS software based on field test was used to study the structural performance of an extra-wide concrete self-anchored suspension bridge under static vehicle loads. The longitudinal, transverse and vertical stresses of the extra-wide girder were analyzed, and the changing criteria of girder stresses induced by vehicle loads were presented. Additionally, the effects of the shear lag on extra-wide box girders were investigated. The results showed that the maximum shear lag coefficient was 1.89 at the junction of bottom plate and outer web at the middle of midspan. Moreover, the non-uniformity of cable force is perceptible under eccentric load. Furthermore, an optimization measure for comparable bridges and essential health monitoring locations were outlined.

Parameter Design Scheme for the embedded Multiport Flexible ac Interconnector

Hongming Li,Jianqiao Zhou,Jianwen Zhang,Xu Cai,Yuwen Liu,Mingyang Yang,Jiajie Zang 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

The softly open point (SOP) is a burgeoning technology to deal with the potential voltage violation and feeder congestion issues yielded by the increasing integration of distributed generations (DGs) and various novel loads. Compared with the traditional solution with the back-to-back modular multilevel converters (BTB-MMC), a novel embedded multiport flexible ac interconnector (eM-FACI) is proposed to serve as the SOP for the feeders’ power regulation with light weight, small volume, and low cost. Flexible multi-feeder interconnection can be achieved by using half-bridge submodules instead of full-power MMC stations. However, due to the feeder integration, the eM-FACI’s unique configuration makes the parameter design more complicated than the conventional BTB-MMC. This paper proposes a parameter design scheme for the eM-FACI’s according to the extreme fluctuate power interaction condition. And the extreme case is designed by the current decoupling and the power decoupling between different feeders. The feasibility and effectiveness of the proposed method are verified by MATLAB/Simulink.

A New Theoretical Equation to Estimate Poisson’s Ratio for Coated Bi-axial Warp Knitted Fabrics under Bias Tensile Loading

Jianwen Chen,Han Zhou,Bing Zhao,Wujun Chen,Mingyang Wang,Zhihong Xu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12

Tensile tests of seven bias angles with a 15 o increment with respect to the warp direction are conducted on a typical coated bi-axial warp knitted fabric (BWKF). By utilizing the Digital Image Correlation technique, the experimental results are processed, and detailed responses of strain contours and Poisson’s ratios are determined for some specific strain levels, and an extraordinary M-shaped relationship between Poisson’s ratio and bias angle is revealed. Then, the tested Poisson’s ratios are compared with corresponding theoretical predictions from the original theory for ordinary anisotropic materials, discrepancies and their possible causes are analyzed. Finally, the original theory used for Poisson’s ratio predication of ordinary anisotropic materials is modified for application to the BWKFs by considering the unique local valley at 45 o caused by structural differences and possible yarn movements. The modified theoretical equation could exhibit the Mshaped relationship between Poisson’s ratio and bias angle, and is validated due to the high similarity between the predictions and experimental results. This investigation could provide some new insights into the orientation-dependence, Poisson’s effect and complex deformation mechanism of BWKFs.

A R2R3-type MYB transcription factor gene from soybean, GmMYB12, is involved in flavonoids accumulation and abiotic stress tolerance in transgenic Arabidopsis

Feibing Wang,Xuqin Ren,Fan Zhang,Mingyang Qi,Huiyun Zhao,Xinhong Chen,Yuxiu Ye,Jiayin Yang,Shuguang Li,Yi Zhang,Yuan Niu,Qing Zhou 한국식물생명공학회 2019 Plant biotechnology reports Vol.13 No.3

The R2R3-type MYB transcription factors have been shown to increase flavonoids accumulation by regulating the expression of key enzyme genes related to flavonoid biosynthesis pathway. However, the roles and underlying mechanisms of the soybean GmMYB12 gene in regulation of flavonoids accumulation and tolerance to abiotic stresses are rarely known. In the present study, the GmMYB12 gene was isolated and its function was characterized. Sequence and yeast one-hybrid analyses showed that GmMYB12 contained two MYB domains and belonged to R2R3-MYB protein with transactivation activity. Subcellular localization analysis in onion epidermal cells indicated that GmMYB12 was localized to the nucleus. Overexpression of GmMYB12 increased the production of downstream flavonoids and the expression of related genes in the flavonoid biosynthesis pathway. It also improved resistance to salt and drought stresses during seed germination, root development, and growing stage. Further component and enzymatic analyses showed significant increases of proline content, pyrroline-5-carboxylate synthase (P5CS), superoxide dismutase (SOD), and peroxidase (POD) activities, as well as significant reduction of H2O2 and malonaldehyde (MDA) content under salt and drought stresses in transgenic plants. Meanwhile, the expression level of AtP5CS, AtSOD and AtPOD genes was up-regulated against salt and drought stresses. Together, our finding indicated that changing the expression level of GmMYB12 in plants alters the accumulation of flavonoids and regulates plantlet tolerance to abiotic stress by regulating osmotic balance, protecting membrane integrity and maintaining ROS homeostasis. The GmMYB12 gene has the potential to be used to increase the content of valuable flavonoids and improve the tolerance to abiotic stresses in plants

Reliability Prediction Model of the CNC System

Yan Gu,Yiqiang Wang,Xiaoqin Zhou,Xiuhua Yuan,Mingyang Ma 보안공학연구지원센터(IJUNESST) 2013 International Journal of u- and e- Service, Scienc Vol.6 No.6

System Parameter Design Method Based on a Serial-Shunt Type Soft Normally Open Point

Haohua Peng,Jianwen Zhang,Jianqiao Zhou,Gang Shi,Xu Cai,Mingyang Yang,Zhuyong Li 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-

The soft normally-open point (SNOP) has been proposed as a solution to address issues stemming from new energy generation and other factors. One of the primary topologies for implementing SNOP is the back-to-back voltage converter (BTB-VSC). However, this approach suffers from several drawbacks, including low efficiency, a large volume, and limited control freedom degrees. To overcome these limitations, we propose a new serial-shunt type soft normally open point (SS-SNOP). To achieve better regulation capability, it is crucial to develop a parameter design method related to system parameters. In this paper, a design method is presented for a set of necessary parameters, such as inductors, capacitors, power devices, and so on. Simulation results confirm the effectiveness of the proposed system parameter design method. Overall, the SS-SNOP topology and the proposed parameter design method offer a promising solution for addressing issues related to new energy generation and other factors.

Phase-field simulation of radiation-induced bubble evolution in recrystallized U-Mo alloy

Yanbo Jiang,Yong Xin,Wenbo Liu,Zhipeng Sun,Ping Chen,Dan Sun,Mingyang Zhou,Xiao Liu,Di Yun 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.1

In the present work, a phase-field model was developed to investigate the influence of recrystallizationon bubble evolution during irradiation. Considering the interaction between bubbles and grain boundary(GB), a set of modified Cahn-Hilliard and Allen-Cahn equations, with field variables and order parametersevolving in space and time, was used in this model. Both the kinetics of recrystallization characterized inexperiments and point defects generated during cascade were incorporated in the model. The bubbleevolution in recrystallized polycrystalline of UeMo alloy was also investigated. The simulation resultsshowed that GB with a large area fraction generated by recrystallization accelerates the formation andgrowth of bubbles. With the formation of new grains, gas atoms are swept and collected by GBs. Thesimulation results of bubble size and distribution are consistent with the experimental results.