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Study on Dynamic Bond-Slip Constitutive Relation of Corroded Mortar Anchor
Haitao Wang,Yue Xin,Pengbo Zhang,Minghua Cui 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.12
In order to study the bonding performance of corroded mortar anchor under dynamic load and reveal the mechanism of dynamic bond-slip, dynamic pull-out tests for mortar anchors with different corrosion degrees were carried out. On the basis of the average bond stress and relative slip, the basic bond-slip constitutive relation of corroded mortar anchor was established according to the measured data. The bond stress under different loading frequency were fitted, and the dynamic influence coefficient affecting the bond performance of mortar anchor was obtained. Based on the bond stress-slip relationship of each point in the anchorage section under different corrosion degrees, the position function in anchorage section was deduced. According to the above basic bond-slip relation, dynamic influence coefficient and anchorage position function, the dynamic bond-slip constitutive relation of corroded mortar anchor regarding to anchorage position was established, which could provide reference for the study on the durability of mortar anchor and its dynamic anchorage performance.
Mechanical Behavior of 3D Woven Variable Thickness Composite Plate under Tensile Loading
Yu Zhou,Haitao Cui,Weidong Wen 한국섬유공학회 2022 Fibers and polymers Vol.23 No.3
As a directly net-shaped structure, 3D woven variable thickness composite plate is different from the constantthickness structure in terms of the changing weft yarn sizes and resulting various warp yarn direction. To investigate themechanical behavior of this structure, a finite element (FE) model was proposed in this paper on the basis of author’sprevious geometric model illustrating the characterized details. Mesh convergence was studied to determine the size ofelement in compromise of accuracy and efficiency. Linear displacement rather than periodic boundary conditions wereapplied due to the thickness change. For the validation of presented FE model, a sample variable thickness plate in 3D layerto layer weave style was tested under tensile load in warp direction whose thickness was changed in this direction by thechange of weft yarn size. The strain was monitored with the help of Digital Image Correlation (DIC) system. The resultsshowed that the predicted homogenized stiffness in warp direction decreased with the thickness increasing, in agreement withthe observation from experiments. The maximum error between the predicted stiffness and the measurements of typicalsegment (TS) in variable thickness region of the plate is 12.05 % while the minimum error is 0.7 %.
Zhengfang Ye,Lili Cui,Qingqiang Meng,Haitao Bi,Lincheng Zhou 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
We studied the simultaneous removal of Pb(II) and chemical oxygen demand (COD) from synthetic solutions using immobilized microorganism. The immobilized microorganisms on polyurethane foam (IPUF) were successfully prepared by cultivating the microbe B350 in a mixture of culture medium and polyurethane foam (PUF). The adsorption of Pb(II) ion from aqueous solutions onto PUF and IPUF was studied by batch adsorption. IPUF exhibited high Pb(II) removal efficiency. When 0.12 g of IPUF was used to treat 50mL of 20mg/L P(II) solution at pH 7.0 and 25 oC for 120 mins, the removal ratio was 80%. The biosorption kinetics could be described by the pseudo-secondorder model, and the adsorption isotherms could be described by Langmuir and Freundlich equations. In addition, for synthetic wastewater containing Pb(II) and C6H12O6, the removal ratios of Pb(II) and COD after being treated by IPUF for 8 hours were 92.0% and 84.2%, respectively. The removal ratio of COD clearly decreased with the increase of Pb(II)concentration, meaning that Pb(II) was toxic to the mobilized microorganisms and lower Pb(II) concentration was preferred.
Hongjian Zhang,Junhua Guo,Weidong Wen,Haitao Cui 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2
This work designed a T-shaped hook-connected structure composed of a bottom plate made of 2.5D woven composites and a T-shaped plate made of TC4 alloy. In order to explore to its bending and tensile properties, the corresponding experiments were designed and performed. Then, based on the progressive damage model and an improved Hashin’s failure criteria, numeral calculations were conducted in ANSYS to study its bending and tensile damage propagations. Compared with experimental results, the maximum error is less than 20 %, and the damage modes are similar, which proves the rationality of numerical calculation. In addition, both the experimental and simulation results show that the fatal damage both occurs at the constrained plate of the bottom plate whether in bending or tensile processes. Specifically, the fatal failure occurs at the installed edges in bending process or at the sides of groove-middle to groove-edge in tensile process. This work provides a design reference for typical T-shaped hook-connected composite structure, especially the connector of blade and casing, which appear in engineering and has good engineering application value.
Research on Dynamic Characteristics of Hard Cutting System
Yue Caixu,Fenghuize,Cai Chunbin,Zhang Haitao,Huang Cui 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.3
Tool wear is an inevitable and continuously aggravated process in precision hard cutting. Interaction between tool wear and dynamic characteristics in cutting system makes the machining accuracy and quality of machined surface declining, which effects dynamic characteristics of cutting system deteriorated significantly. Based on this, cutter dynamic modal parameters of a specific cutting system are measured in this paper. Cutting force and change law of acceleration power spectrum are studied by experiments. Influence mechanism of tool wear on system frequency energy distribution was obtained. The cutting system dynamic characteristics are quantified by establishing simulation model. Root locus plot of non-uniform load distribution is obtained and the minimum stiffness ratio in the root locus plot is determined. The effect of tool flank wear on cutting system stability in quantitatively stable is researched.The results can provide a theoretical basis for the selection of reasonable selection of stable precision cutting conditions in different tool wear conditions.
Ming Yao,Jiali Zhou,Yicheng Zhu,Yinxin Zhang,Xia Lv,Ruixue Sun,Ao Shen,Haitao Ren,Liying Cui,Hongzhi Guan,Honglong Wu 대한신경과학회 2016 Journal of Clinical Neurology Vol.12 No.4
Background and Purpose Encephalitis caused by Listeria monocytogenes (L. monocyto¬genes) is rare but sometimes fatal. Early diagnosis is difficult using routine cerebrospinal flu¬id (CSF) tests, while next-generation sequencing (NGS) is increasingly being used for the detection and characterization of pathogens. Methods This study set up and applied unbiased NGS to detect L. monocytogenes in CSF collected from three cases of clinically suspected listeria meningoencephalitis. Results Three cases of patients with acute/subacute meningoencephalitis are reported. Magnetic resonance imaging and blood cultures led to a suspected diagnosis of L. monocy¬togenes, while the CSF cultures were negative. Unbiased NGS of CSF identified and se¬quenced reads corresponding to L. monocytogenes in all three cases. Conclusions This is the first report highlighting the feasibility of applying NGS of CSF as a diagnostic method for central nervous system (CNS) L. monocytogenes infection. Routine application of this technology in clinical microbiology will significantly improve diagnostic methods for CNS infectious diseases.