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Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2, Pages 333-345 doi: 10.1007/s11709-021-0718-8

Abstract: requires investigating the effects of related influencing factors on the hydraulic fracturing pressure and fracturecompressive strength, slurry viscosity, and axial and circumferential loads, on the fracturing pressure and fracturedip were examined.The results indicate that the fracture dip is mainly affected by the deviator stress.

Keywords： slurry shield tunneling hydraulic fracturing test fracturing pressure fracture dip unconfined compressive

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Hot-dip galvanizing of cold-formed steel hollow sections: a state-of-the-art review

Min SUN, Jeffrey A. PACKER

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 1, Pages 49-65 doi: 10.1007/s11709-017-0448-0

Abstract: A good understanding of the effects of galvanizing on the short- and long-term behaviours of steel components is essential for structural design. This review paper is motivated by a series of recent reports on cracking in galvanized cold-formed tubular steel structures and the limitations of current steel product standards and steel design specifications in this field. The steel-related and galvanizing-related factors, different pre-galvanizing countermeasures for brittle cracking and the available technical documents are summarized. An extensive bibliography is provided as a basis for future research and development in this field.

Keywords： cold-formed steel hollow structural sections hot-dip galvanizing embrittlement heat-treatment residual

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Mechanism and development of dip-pen nanolithography （DPN）

Jiang Hongkui,Yao Tangwei,Hu Liguang,Shen Yaqiang,Yu Xianwen

Strategic Study of CAE 2008, Volume 10, Issue 7, Pages 173-179

Abstract:

Dip-pen nanolithography is a new kind of scanning probe lithography (The process of dip pen lithography involves the adsorption of ink molecules on AFM tip,the formationsubstrate.More factors such as temperature,humidity,tip,scanning speed and so on will influence the process of dip

Keywords： dip-pen nanolithography atomic force microscopy nanofabrication

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Tests on impact effect of partial fracture at steel frame connections

CHEN Yiyi, BIAN Ruoning

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 4, Pages 295-301 doi: 10.1007/s11709-008-0049-z

Abstract: Impact effect of sudden fracture at steel frame connections under severe earthquake or other extremeThe relation of impulse caused by structural fracture to the release of inner force at the cracked locationIt is also revealed that the instant fracture of structural connection is characterized by progressiveand partial fracture.Numerical evaluation of the impact effect of connection fracture is carried out.

Keywords： structural fracture natural fracture progressive high-frequency

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Effect of fly ash replacement level on the fracture behavior of concrete

Mahdi AREZOUMANDI, Jeffery S. VOLZ

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4, Pages 411-418 doi: 10.1007/s11709-013-0228-4

Abstract: results of an experimental investigation that evaluates effect of fly ash replacement level on the fractureThis experimental program consisted of 32 fracture beams to study the fracture behavior of concrete.The experimental fracture energies were compared with the fracture energy provisions of different designevaluate whether or not there is any statistically significant difference between the experimental fracturethese statistical tests show that the mix with higher level of fly ash replacement level has higher fracture

Keywords： concrete fracture energy fly ash

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Computational modeling of fracture in concrete: A review

Luthﬁ Muhammad Mauludin, Chahmi Oucif

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 586-598 doi: 10.1007/s11709-020-0573-z

Abstract: This paper presents a review of fracture modeling of concrete.Based on comprehensive literature review, there are two main approaches considered to-date of concrete fractureThe purpose of this review is to provide insight comparison from different techniques in modeling of fractureIn the first section, an overview of fracture modeling in general is highlighted.

Keywords： concrete fracture macroscopic micromechanical heterogeneity

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Computational modeling of fracture in capsule-based self-healing concrete: A 3D study

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 6, Pages 1337-1346 doi: 10.1007/s11709-021-0781-1

Abstract: We present a three-dimensional (3D) numerical model to investigate complex fracture behavior using cohesivepre-inserted cohesive elements are also applied into the initial meshes of solid elements to account for fractureThe proposed model provides an effective tool for predicting the complex fracture response of capsule-based

Keywords： 3D fracture self-healing concrete spherical cohesive elements heterogeneous

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Evaluating the material strength from fracture angle under uniaxial loading

Jitang FAN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 288-293 doi: 10.1007/s11709-018-0480-8

Abstract: Generally, shearing fracture model occurs in both the tests.Shearing fracture angle is smaller than 45° under uniaxial compression and greater than 45° under uniaxialof material strength under uniaxial compression and tension is developed by correlating the shearing fracturerelation is quantitatively illustrated by a function for analyzing the material strength from shear fracture

Keywords： strength fracture mechanics

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A dimensional analysis on asphalt binder fracture and fatigue cracking

Qian ZHAO, Zhoujing YE

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 2, Pages 201-206 doi: 10.1007/s11709-017-0402-1

Abstract: Fracture and fatigue cracking in asphalt binder are two of most serious problems for pavement engineersconsists both of dimensional analysis using Buckingham Theorem and -integral analysis based on classic fracturemechanics, to evaluate the fracture and fatigue on asphalt binder.is discovered that the dimensional analysis could provide a new perspective to analyze the asphalt fracture

Keywords： Dimensional analysis asphalt fracture fatigue cracking

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Experimental research on ductile fracture criterion in metal forming

Song YU, Weiming FENG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 308-311 doi: 10.1007/s11465-011-0233-z

Abstract:

Ductile fracture criterion is key limitation parameter in material forming.shearing test on 45# steel are utilized for providing the experimental values of the critical values at fracture, and 11 widely used ductile fracture criterion are selected to simulate the physical experiments andtheir relative accuracy for predicting and quantifying fracture initiation sites are investigated.triaxiality can be estimated successively using both Normalized Cockcroft-latham and the Brozzo ductile fracture

Keywords： ductile fracture criteria metal forming process material experiment stress triaxiality

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Hybrid deep learning model for risk prediction of fracture in patients with diabetes and osteoporosis

Frontiers of Medicine 2022, Volume 16, Issue 3, Pages 496-506 doi: 10.1007/s11684-021-0828-7

Abstract: The fracture risk of patients with diabetes is higher than those of patients without diabetes due toIn addition, the fracture risk of patients with diabetes and osteoporosis has not been further studiedIn this paper, a hybrid model combining XGBoost with deep neural network is used to predict the fracturepatients with diabetes and osteoporosis, and investigate the effect of patients’ physiological factors on fractureMoreover, the top 18 influencing factors of fracture risks of patients with diabetes are determined.

Keywords： XGBoost deep neural network healthcare risk prediction

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A concise review about fracture assessments of brittle solids with V-notches

Hsien-Yang YEH, Bin YANG

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2, Pages 478-485 doi: 10.1007/s11709-019-0520-z

Abstract:

A concise review of recent studies about the fracture assessments of elastic brittle solid materialsFracture criteria such as strain energy density, J-integral, theory of critical distance are used.

Keywords： fracture assessment brittle solids V-notches review

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Measurement of dynamic fracture toughness and failure behavior for explosive mock materials

Pengwan CHEN, Zhongbin ZHOU, Shaopeng MA, Qinwei MA, Fenglei HUANG

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3, Pages 292-295 doi: 10.1007/s11465-011-0237-8

Abstract: A high-speed camera was used to capture the deformation and fracture process of the specimen in situ.Results show that the method of combined DIC and SHPB is effective to study the dynamic deformation and fractureThe fracture toughness of the specimen was preliminary measured.

Keywords： bonded explosive simulant split Hopkinson pressure bar (SHPB) semicircular bending test deformation fracture

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A continuous/discontinuous deformation analysis (CDDA) method based on deformable blocks for fracture

Yongchang CAI, Hehua ZHU, Xiaoying ZHUANG

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 4, Pages 369-378 doi: 10.1007/s11709-013-0222-x

Abstract: The CDDA is particularly suitable for modeling the fracture propagation because the switch from continuous

Keywords： fracture crack propagation deformable block continuous/discontinuous deformation analysis (CDDA)

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Experimental measurement of double-K fracture parameters of concrete with small-size aggregates

ZHANG Xiufang, XU Shilang, ZHENG Shuang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4, Pages 448-457 doi: 10.1007/s11709-007-0061-8

Abstract: The double- fracture model can well describe the development of cracks undergoing during the entire fractureTherefore, it has been selected as the theoretical basis of the Norm for fracture test of

Keywords： development concrete theoretical double- fracture