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Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 3,   Pages 369-376 doi: 10.1007/s11465-018-0489-7

Abstract: This study aims to examine the crack growth behavior of turbine disc GH4169 superalloy under creep-fatigue loading. Crack growth experiments were performed on compact tension specimens using trapezoidal waveform with dwell time at the maximum load at 650 °C. The crack growth rate of GH4169 superalloy significantly increased with dwell time. The grain boundaries oxidize during the dwell process, thereby inducing an intergranular creep-fatigue fracture mode. In addition, testing data under the same dwell time showed scattering at the crack growth rate. Consequently, a modified model based on the Saxena equation was proposed by introducing a distribution factor for the crack growth rate. Microstructural observation confirmed that the small grain size and high volume fraction of the d phase led to a fast creep-fatigue crack growth rate at 650 °C, thus indicating that two factors, namely, fine grain and presence of the d phase at the grain boundary, increased the amount of weakened interface at high temperature, in which intergranular cracks may form and propagate.

Keywords： crack growth rate     creep-fatigue     GH4169 superalloy     CT specimen     dwell time    

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Efficient scheme of low-dose CT reconstruction using TV minimization with an adaptive stopping strategy Article

Yong DING, Tuo HU

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 12,   Pages 2001-2008 doi: 10.1631/FITEE.1700287

Abstract: Recently, low-dose computed tomography (CT) has become highly desirable because of the growing concernFor low-dose CT imaging, it is a significant challenge to guarantee image quality while reducing radiationTo promote low-dose CT imaging, we propose a promising reconstruction scheme which combines total-variationin terms of image quality and computational efficiency, which validates its potential for low-dose CT

Keywords： Low-dose computed tomography (CT)     CT imaging     Total variation     Sparse dictionary learning    

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Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamic

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Frontiers of Medicine 2009, Volume 3, Issue 2,   Pages 230-235 doi: 10.1007/s11684-009-0023-8

Abstract: We implemented a new protocol — multiphase dynamic helical scan to acquire CT angiography (CTA) and wholebrain CT perfusion (CTP) images simultaneously with single scan on 16 multidetector CT (MDCT).Each group underwent CT scan by using the new protocol, traditional CTA and CTP protocol, respectivelyThe volume CT dose index (CTDIvol) and dose length product (DLP) of our protocol were lower than the

Keywords： computed tomography angiography     computed tomography perfusion    

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Low-dose CT for lung cancer screening: opportunities and challenges

Hongbing Shen

Frontiers of Medicine 2018, Volume 12, Issue 1,   Pages 116-121 doi: 10.1007/s11684-017-0600-1

Abstract:

Lung cancer is among the most frequently diagnosed cancers worldwide and the leading cause of cancer death in both males and females. Screening for lung cancer coupled with earlier intervention has long been studied as an approach to mortality reduction. However, minimal progress was achieved until recently, when low-dose spiral computed tomography (LDCT) screening demonstrated a 20% reduction in mortality from lung cancer in a randomized controlled trial (RCT), the National Lung Screening Trial, from the United States. On the basis of this finding, LDCT has been recommended for lung cancer screening in high-risk populations by several clinical guidelines. However, results from the following independent RCTs in Europe failed to show consistent conclusions. In addition, intractable problems gradually emerged with the progress of LDCT screening. This paper summarizes and discusses the main observations and challenges of LDCT screening for lung cancer. Before spreading implementation of LDCT screening, challenges, including high false-positive rates, overdiagnosis, enormous costs, and radiation risk, must be addressed. Complementary biomarkers and technical improvement are expected in the field of lung cancer screening in the near future.

Keywords： lung cancer     low-dose computerized tomography     early detection     opportunities     challenges    

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The dynamic correction of collimation errors of CT slicing pictures

LIU Ya-xiong, Sekou Sing-are, LI Di-chen, LU Bing-heng

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 2,   Pages 168-172 doi: 10.1007/s11465-006-0016-0

Abstract: To eliminate the motion artifacts of CT images caused by patient motions and other related errors, twoconfirm that the correction method with any of the correctors can improve the accuracy and reliability of CT
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Effects of delamination in drilling glass/polyester composite

Mehdi GANJIANI, Majid SAFARABADI, Nabi MEHRI-KHANSARI, Hossein ORUJI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 552-567 doi: 10.1007/s11709-021-0699-7

Abstract: Considering failures during machinery processes such as drilling, a precautionary analysis involving delamination and the corresponding dissipated energy is required, especially for composite structures. In this context, because of the complexity of both the analysis procedure and experimental test setup, most studies prefer to represent mode I and III interlaminar crack propagation instead of that involving mode II. Therefore, in this study, the effect of mode delamination and corresponding interlaminar crack propagation was considered during the drilling process of multilayered glass/polyester composites using both numerical and experimental approaches. In the experimental procedure, the mechanical properties of the glass/polyester specimens were obtained according to ASTM D3039. In addition, the interlaminar mixed-mode (I/II) loadings were determined using an ARCAN test fixture so that the fracture toughness of glass/polyester could then be identified. The mode II critical strain energy release rate (CSERR) was then obtained using an experimental test performed using an ARCAN fixture and the virtual crack closure technique (VCCT). It was determined that the numerical approach was in accordance with the experiments, and more than 95% of crack propagation could be attributed to mode II compared to the two other modes.

Keywords： delamination     VCCT     ARCAN specimen     drilling     mode II    

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Analyzing the characterization of pore structures and permeability of diesel contaminated clays under different aging conditions

Frontiers of Structural and Civil Engineering   Pages 1264-1280 doi: 10.1007/s11709-023-0921-x

Abstract: In this study, mercury intrusion porosimetry (MIP) and X-ray micro-computed tomography (XRμCT) were usedThe XRμCT analysis yielded consistent results; it showed that aging renders pores more spherical andThe combination of MIP and XRμCT provided a comprehensive and reliable characterization of the soil pore

Keywords： MIP     XRμCT     aging     diesel content     pore structure     permeability characteristics    

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Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size Article

Zhangyu Wu, Jinhua Zhang, Hongfa Yu, Qin Fang, Haiyan Ma, Li Chen

Engineering 2022, Volume 17, Issue 10,   Pages 110-122 doi: 10.1016/j.eng.2021.02.024

Abstract: investigate the static splitting-tensile behaviors of CAC under the influence of two factors, namely specimenWe established 12 different specimen models with two specimen shapes (i.e., a cube with an edge lengthThe effects of specimen geometry and strip width on the splitting-tensile properties of CAC, such asThe fst values of CAC are associated with both the specimen geometry and width of the bearing strip.

Keywords： Coral aggregate concrete     3D mesoscopic modelling     Split-tension test     Tensile strength     Specimen geometry    

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Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 5,   Pages 763-779 doi: 10.1007/s11709-023-0917-6

Abstract: A disadvantage of the conventional quasi-static test method is that it does not consider the soil restraint effect. A new method to test the seismic performance of prefabricated specimens for underground assembled structures is proposed, which can realistically reflect the strata restraint effect on the underground structure. Laboratory work combined with finite element (FE) analysis is performed in this study. Three full-scale sidewall specimens with different joint forms are designed and fabricated. Indices related to the seismic performance and damage modes are analyzed comprehensively to reveal the mechanism of the strata restraint effect on the prefabricated sidewall components. Test results show that the strata restraint effect effectively improves the energy dissipation capacity, load-bearing capacity, and the recoverability of the internal deformation of the precast sidewall components. However, the strata restraint effect reduces the ductility of the precast sidewall components and aggravates the shear and bending deformations in the core region of the connection joints. Additionally, the strata restraint effect significantly affects the seismic performance and damage mode of the prefabricated sidewall components. An FE model that can be used to conduct a seismic performance study of prefabricated specimens for underground assembled structures is proposed, and its feasibility is verified via comparison with test data.

Keywords： underground structures     precast sidewall specimen     seismic test method     bearing capacity     energy dissipation    

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Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 1,   Pages 109-123 doi: 10.1007/s11709-021-0693-0

Abstract: For high-density rockfill materials, a set of specimen preparation devices for inclined compaction planesprincipal stress direction angles can change the extent of the particle interlocking effect, causing the specimen

Keywords： rockfill     inclination of specimen preparation     anisotropy     mechanical property     mechanism    

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A pilot study on Paxlovid therapy for hemodialysis patients with severe acute respiratory syndrome coronavirus 2 infections

Frontiers of Medicine doi: 10.1007/s11684-023-1011-0

Abstract: Laboratory parameters and chest CT (computed tomography) imaging were analyzed.patients progressed to moderate disease, and none in the treatment group showed progression of chest CT

Keywords： Paxlovid     hemodialysis     SARS-CoV-2     viral load     chest CT scan    

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Comparison of CT-guided aspiration to key hole craniotomy in the surgical treatment of spontaneous putaminal

ZHAO Jizong, WANG Dejiang, WANG Shuo, YUAN Ge, KANG Shuai, JI Nan, ZHAO Yuanli, YE Xun, ZHOU Liangfu, ZHOU Dingbiao, WANG Renzhi, WANG Mei

Frontiers of Medicine 2007, Volume 1, Issue 2,   Pages 142-146 doi: 10.1007/s11684-007-0027-1

Abstract: This study was designed to compare the approaches and efficacies of two different ways of neurosurgical management for spontaneous putaminal hemorrhage (SPH): computed tomographic-guided aspiration (CTGA) and the key-hole approach (KHA). The indications of the two approaches are also explored. From September 2001 to 2003, a total of 1077 cases of SPH distributed in 135 hospitals all over the mainland of China were included for analysis. All cases had three-month follow-up data. The study was designed in a single-blinded manner to compare the efficacies of the different approaches. There were 563 cases in the CTGA group, 165 in the KHA group, and 217 cases in the conventional open craniotomy (COC) group. In the CTGA and KHA groups, the mortalities at one month after operation (M1m) were 17.9% and 18.3%, respectively, while the mortalities at three months after operation (M3m) were 19.4% and 19.4%, respectively (>0.05). The postoperative complications due to CTGA (23.7%) were not significantly different from those due to KHA (25.7%) ( = 0.420). The M3m of patients with Glasgow coma scale (GCS) "d8 was 3.45 and 4.0 times as much as those with GCS>8, respectively. The M3m of patients with complications was 3.92 times as much as those without complications. The M3m of patients with hemorrhage volume "e70 mL was 2.67 times as much as those <70 mL. The CTGA is not better than KHA in the treatment of SPH in terms of a more favorable outcome or less mor tality and morbidity, but CTGA could be the first choice for those with bleeding volumes "d50mL, while KHA is the first choice for those with bleeding volumes >50 mL.

Keywords： tomographic-guided aspiration     single-blinded manner     favorable outcome     operation     Glasgow    

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Trauma-induced “Macklin effect” with pneumothorax and large pneumomediastinum, disguised by allergy

Salomone Di Saverio, Kenji Kawamukai, Andrea Biscardi, Silvia Villani, Luca Zucchini, Gregorio Tugnoli

Frontiers of Medicine 2013, Volume 7, Issue 3,   Pages 386-388 doi: 10.1007/s11684-013-0278-y

Abstract: Subsequent chest CT scan showed a small left pneumothorax and a large amount of air in the mediastinum

Keywords： thoracic trauma     differential diagnosis     critical care     pneumothorax     pneumomediastinum     CT scan     pitfalls    

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A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 2,   Pages 89-101 doi: 10.1007/s11709-013-0197-7

Abstract: of this paper is to propose a new quality evaluation method for asphalt concrete mixture using X-ray CTscanning; 4) frequency of CT-value, threshold value, average slice CT-value, average segment CT-valuefine aggregate and filler and CT image of bitumen was nearly homogeneous.In the mixture examination, histograms of CT-value and four segmentation images made from CT images expressedaverage CT-value of the bitumen.

Keywords： asphalt concrete mixture     aggregate     bitumen     bitumen content     quality evaluation     X-ray CT    

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A miniature triaxial apparatus for investigating the micromechanics of granular soils with

Zhuang CHENG, Jianfeng WANG, Matthew Richard COOP, Guanlin YE

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 357-373 doi: 10.1007/s11709-019-0599-2

Abstract: In conjunction with an X-ray micro-tomography (termed as X-ray μCT hereafter) facility and advanced imageThe developed triaxial apparatus, in its combined use of X-ray μCT imaging techniques, is a powerful

Keywords： triaxial apparatus     X-ray μCT     in situ test     micro-scale mechanical behavior     granular soils    

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Title Author Date Type Operation

Creep-fatigue crack growth behavior in GH4169 superalloy

Dianyin HU, Xiyuan WANG, Jianxing MAO, Rongqiao WANG

Journal Article

Efficient scheme of low-dose CT reconstruction using TV minimization with an adaptive stopping strategy

Yong DING, Tuo HU

Journal Article

Simultaneous acquisition of CT angiography and whole brain CT perfusion images by using multiphase dynamic

Weiwei CHEN, Jianpin QI, Wenzhen ZHU, Wenhua HUANG, Jinmei SONG

Journal Article

Low-dose CT for lung cancer screening: opportunities and challenges

Hongbing Shen

Journal Article

The dynamic correction of collimation errors of CT slicing pictures

LIU Ya-xiong, Sekou Sing-are, LI Di-chen, LU Bing-heng

Journal Article

Effects of delamination in drilling glass/polyester composite

Mehdi GANJIANI, Majid SAFARABADI, Nabi MEHRI-KHANSARI, Hossein ORUJI

Journal Article

Analyzing the characterization of pore structures and permeability of diesel contaminated clays under different aging conditions

Journal Article

Three-Dimensional Mesoscopic Investigation on the Impact of Specimen Geometry and Bearing Strip Size

Zhangyu Wu, Jinhua Zhang, Hongfa Yu, Qin Fang, Haiyan Ma, Li Chen

Journal Article

Effect of strata restraint on seismic performance of prefabricated sidewall joints in fabricated subway stations

Journal Article

Experimental study on compaction-induced anisotropic mechanical property of rockfill material

Xiangtao ZHANG, Yizhao GAO, Yuan WANG, Yu-zhen YU, Xun SUN

Journal Article

A pilot study on Paxlovid therapy for hemodialysis patients with severe acute respiratory syndrome coronavirus 2 infections

Journal Article

Comparison of CT-guided aspiration to key hole craniotomy in the surgical treatment of spontaneous putaminal

ZHAO Jizong, WANG Dejiang, WANG Shuo, YUAN Ge, KANG Shuai, JI Nan, ZHAO Yuanli, YE Xun, ZHOU Liangfu, ZHOU Dingbiao, WANG Renzhi, WANG Mei

Journal Article

Trauma-induced “Macklin effect” with pneumothorax and large pneumomediastinum, disguised by allergy

Salomone Di Saverio, Kenji Kawamukai, Andrea Biscardi, Silvia Villani, Luca Zucchini, Gregorio Tugnoli

Journal Article

A study on quality evaluation for bituminous mixture using X-ray CT

Satoshi TANIGUCHI, Keiichiro OGAWA, Jun OTANI, Itaru NISHIZAKI

Journal Article

A miniature triaxial apparatus for investigating the micromechanics of granular soils with

Zhuang CHENG, Jianfeng WANG, Matthew Richard COOP, Guanlin YE

Journal Article