Search results for: Fengxiang Xu

Items from 1 to 19 out of 19 results

article

Pathogenicity and transmissibility of current H3N2 swine influenza virus in Southern China: A zoonotic potential

Yanan Yu, Meihua Wu, Xinxin Cui, Fengxiang Xu, more

Transboundary and Emerging Diseases > 69 > 4 > 2052 - 2064

Swine are considered as ‘mixing vessels’ of influenza A viruses and play an important role in the generation of novel influenza pandemics. In this study, we described that the H3N2 swine influenza (swH3N2) viruses currently circulating in pigs in Guangdong province carried six internal genes from 2009 pandemic H1N1 virus (pmd09), and their antigenicity was obviously different from that of current...

article

Discrete Optimization Design of Tailor-Welded Blanks (TWBs) Thin-Walled Structures Under Dynamic Crashing

Yisong Chen, Fengxiang Xu, Suo Zhang, Kunying Wu, more

International Journal of Automotive Technology > 2019 > 20 > 2 > 265-275

Tailor-welded blanks (TWBs) thin-walled structures have been widely applied in field of automotive and construction due to their significant advantages in saving weight and improving crashworthiness. To further understand and improve crashing performance of TWB structures, this paper conducts parametric analysis and optimization design on TWB thin-walled tubes. Firstly, the numerical model of dynamic...

article

Multi-response optimization design of tailor-welded blank (TWB) thin-walled structures using Taguchi-based gray relational analysis

Fengxiang Xu, Suo Zhang, Kunying Wu, Zhinan Dong

Thin-Walled Structures > 2018 > 131 > C > 286-296

In order to further improve crashworthiness and reduce weight, tailor-welded blanks (TWBs) have been widely applied in auto-body design. In this paper, the discrete optimization design of TWBs structures with top-hat thin-walled section subjected to front dynamic impact is performed by using Taguchi-based gray relational analysis. Material grades and thicknesses with three levels are taken as discrete...

article

A review on functionally graded structures and materials for energy absorption

Fengxiang Xu, Xiong Zhang, Hui Zhang

Engineering Structures > 2018 > 171 > C > 309-325

In the past decades, there has been a constant aspiration for light-weight and highly efficient energy-absorbing structures and materials in vehicle and other industries. A large number of publications have shown that advanced configurations with functionally graded properties could collapse in a more controlled manner and have a remarkable energy-absorbing efficiency when compared with traditional...

article

Isolation and characterization of a novel chalcone synthase gene family from mulberry

Chuanhong Wang, Shuang Zhi, Changying Liu, Fengxiang Xu, more

Plant Physiology and Biochemistry > 2017 > 115 > C > 107-118

Chalcone synthase (CHS) is the pivotal enzyme that catalyzes the first committed step of the phenylpropanoid pathway leading to flavonoids. Here, five CHS genes were determined in mulberry (Morus atropurpurea Roxb.). Interestingly, phylogenetic analysis tended to group three MaCHSs in the stilbene synthase (STS) family and initially annotated these as MaSTSs. A co-expression system that harbored a...

article

Design optimization of thin-walled circular tubular structures with graded thickness under later impact loading

Fengxiang Xu, Xiaojin Wan, Yisong Chen

International Journal of Automotive Technology > 2017 > 18 > 3 > 439-449

In order to improve the crashing performance under lateral impact scenario, a thin-walled circular tube with functionally graded thickness (FGT) is introduced with its superior performance in this paper. The wall thickness of the FGT tubual structure is graded along the axial direction. Based on the assumed graded thickness function, several important parameters (such as the graded exponent, the tube...

article

Dynamic axial crashing of tailor-welded blanks (TWBs) thin-walled structures with top-hat shaped section

Fengxiang Xu, Chao Wang

Advances in Engineering Software > 2016 > 96 > C > 70-82

In this paper, dynamic axial crashing analysis of tailor-welded blanks (TWBs) thin-walled structures with top-hat shaped section under front impact is presented. The crash tests are performed through a sled test in order to model a car-to-car front impact. The strain rate dependence of both high strength steels (DP590 and DP780) is considered to study its influence on acceleration and energy absorption...

article

Enhancing material efficiency of energy absorbers through graded thickness structures

Fengxiang Xu

Thin-Walled Structures > 2015 > 97 > Complete > 250-265

At present, there has been constant aspiration of advanced thin-walled structures in vehicular industries for more efficient usage of materials to achieve much lighter weight and even higher energy absorption. In this paper, functionally graded thickness (FGT) tubes with a varying wall thickness are introduced and their energy-absorbing efficiency is enhanced. Apart from the geometrical parameters...

article

A comparative study on thin-walled structures with functionally graded thickness (FGT) and tapered tubes withstanding oblique impact loading

Guangyao Li, Fengxiang Xu, Guangyong Sun, Qing Li

International Journal of Impact Engineering > 2015 > 77 > Complete > 68-83

As a relatively new component with a higher efficiency of material utilization, functionally graded thickness (FGT) structure with probably varying wall thickness becomes fairly promising. This paper compares the energy absorption capabilities of FGT, tapered uniform thickness (TUT) and widely-utilized straight uniform thickness (SUT) tubes subjected to oblique impact loading. The analytical formula...

article

Identification and Expression Analysis of the 14-3-3 Gene Family in the Mulberry Tree

Yan Yang, Maode Yu, Fengxiang Xu, Yasheng Yu, more

Plant Molecular Biology Reporter > 2015 > 33 > 6 > 1815-1824

The 14-3-3 protein family regulates diverse physiological processes in plants. In this study, we identified eight 14-3-3 genes (designated MaGF14a to MaGF14h) from the mulberry tree. The phylogenetic tree demonstrated that MaGF14s can be divided into two major groups. Tissue-specific expression profiles indicated that the eight MaGF14s were expressed in all organs and they were most highly expressed...

article

Crushing analysis and multiobjective optimization for functionally graded foam-filled tubes under multiple load cases

Guangyao Li, Zheshuo Zhang, Guangyong Sun, Fengxiang Xu, more

International Journal of Mechanical Sciences > 2014 > 89 > Complete > 439-452

Functionally graded foam (FGF)-filled tubes have been recently gaining comprehensive attention due to its excellent energy absorption capacity under axial impact. However, energy absorption devices generally rarely experience pure axial loading in real working condition, but rather oblique loads, especially during a vehicle crash event. This paper aims at investigating the crashworthiness of the FGF-filled...

article

Experimental investigation on high strength steel (HSS) tailor-welded blanks (TWBs)

Fengxiang Xu, Guangyong Sun, Guangyao Li, Qing Li

Journal of Materials Processing Tech. > 2014 > 214 > 4 > 925-935

This paper aims to investigate mechanical characteristics of the new tailor-welded blank (TWB) components made of high strength steel (HSS). A series of HSS-TWB thin plates with different orientations of weld line are studied through three-point bending tests to evaluate the effects of different design parameters, such as weld line locations and material combinations, on the deformation behaviors...

article

Determination of mechanical properties of the weld line by combining micro-indentation with inverse modeling

Guangyong Sun, Fengxiang Xu, Guangyao Li, Xiaodong Huang, more

Computational Materials Science > 2014 > 85 > Complete > 347-362

This paper provides a comprehensive study on determination of mechanical parameters in the weld zone and heat affected zone (HAZ) by using the micro-indentation and inverse modeling techniques. In order to improve the simulation accuracy of finite element (FE) modeling for such complex welded structures as tailed-weld blanks (TWBs), it is critical to characterize the detailed mechanical properties...

article

Crashing analysis and multiobjective optimization for thin-walled structures with functionally graded thickness

Guangyong Sun, Fengxiang Xu, Guangyao Li, Qing Li

International Journal of Impact Engineering > 2014 > 64 > Complete > 62-74

Thin-walled structures have exhibited significant advantages in light weight and energy absorption and been widely applied in automotive, aerospace, transportation and defense industries. Unlike existing thin-walled structures with uniform thickness, this paper introduces functionally graded structures with changing wall thickness along the longitudinal direction in a certain gradient (namely, functionally...

article

Experimental study on crashworthiness of tailor-welded blank (TWB) thin-walled high-strength steel (HSS) tubular structures

Fengxiang Xu, Guangyong Sun, Guangyao Li, Qing Li

Thin-Walled Structures > 2014 > 74 > Complete > 12-27

This paper aims to investigate the crushing behaviors of tailor-welded blank (TWB) thin-walled structures. A series of TWB high-strength steel (HSS) square tubes with different weld line locations is used to perform the crushing tests for evaluating the effects of different TWB parameters, such as weld line locations and material combinations, on crushing characteristics. These TWB specimens are fabricated...

article

Failure analysis for resistance spot welding in lap-shear specimens

Fengxiang Xu, Guangyong Sun, Guangyao Li, Qing Li

International Journal of Mechanical Sciences > 2014 > 78 > Complete > 154-166

Based on the elasticity theory and finite element method, this paper aims to explore the failure incidence of resistance spot welding in dual-phase lap-shear specimens. The stress function approach is adopted to derive an analytical solution to a lap-shear specimen containing a spot weld nugget subjected to the uniformly distributed loading condition, which provides a means to exploring the stress...

article

Identification of mechanical properties of the weld line by combining 3D digital image correlation with inverse modeling procedure

Guangyao Li, Fengxiang Xu, Guangyong Sun, Qing Li

The International Journal of Advanced Manufacturing Technology > 2014 > 74 > 5-8 > 893-905

In this study, the 3D digital image correlation technique is combined with the inverse modeling methodology to determine mechanical properties of the weld line including heated-affected zone (HAZ). The literature showed that identification of detailed mechanical properties of the weld line is critical to the characterization of mechanical performance of such welded structures as tailor-welded blanks...

article

Crashworthiness design of multi-component tailor-welded blank (TWB) structures

Fengxiang Xu, Guangyong Sun, Guangyao Li, Qing Li

Structural and Multidisciplinary Optimization > 2013 > 48 > 3 > 653-667

Crashworthiness of tailor-welded blank (TWB) structures signifies an increasing concern in lightweight design of vehicle. Although multiobjective optimization (MOO) has to a considerable extent been successfully applied to enhance crashworthiness of vehicular structures, majority of existing designs were restricted to single or uniform thin-walled components. Limited attention has been paid to such...

article

Adaptive heuristic search algorithm for discrete variables based multi-objective optimization

Long Tang, Hu Wang, Guangyao Li, Fengxiang Xu

Structural and Multidisciplinary Optimization > 2013 > 48 > 4 > 821-836

Although metamodel technique has been successfully used to enhance the efficiency of the multi-objective optimization (MOO) with black-box objective functions, the metamodel could become less accurate or even unavailable when the design variables are discrete. In order to overcome the bottleneck, this work proposes a novel random search algorithm for discrete variables based multi-objective optimization...

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Keywords

CRASHWORTHINESS (6)
ENERGY ABSORPTION (6)
THIN-WALLED STRUCTURES (4)
TAILOR-WELDED BLANK (TWB) (3)
WELD LINE (3)
DYNAMIC CRASHING (2)
FINITE ELEMENT ANALYSIS (FEA) (2)
GRADED THICKNESS (2)
MECHANICAL PROPERTIES (2)
MULBERRY (2)
MULTIOBJECTIVE OPTIMIZATION (2)
TAILOR-WELDED BLANKS (TWBS) (2)
14-3-3 GENE (1)
3D DIGITAL IMAGE CORRELATION (DIC) (1)
ADVANCED HIGH STRENGTH STEEL (AHSS) (1)
AIRY STRESS FUNCTION (1)
ANTIGENICITY (1)
CELLULAR MATERIALS (1)
CHALCONE SYNTHASE (1)
CIRCULAR TUBES (1)
CO-EXPRESSION (1)
DEVELOPMENT ANALYSIS (1)
DIGITAL IMAGE CORRELATION (DIC) (1)
DISCRETE DESIGN (1)
DISCRETE VARIABLES BASED MULTI-OBJECTIVE OPTIMIZATION (1)
FAILURE MECHANISM (1)
FINITE ELEMENT ANALYSIS (1)
FLAVONOIDS (1)
FUNCTIONALLY GRADED FOAM (FGF)-FILLED TUBES (1)
FUNCTIONALLY GRADED MATERIAL (1)
FUNCTIONALLY GRADED THICKNESS (1)
FUNCTIONALLY GRADED THICKNESS (FGT) (1)
GENETIC ALGORITHM (1)
GRAY RELATIONAL ANALYSIS (1)
H3N2 INFLUENZA VIRUS (1)
HIGH STRENGTH STEEL (HSS) (1)
HIGH-STRENGTH STEEL (HSS) (1)
INVERSE MODELING METHODOLOGY (1)
INVERSE PROBLEM (1)
KCHS METHOD (1)
LATERAL IMPACT (1)
LIGHT-WEIGHT (1)
MECHANICAL CHARACTERISTICS (1)
METAMODELING METHOD (1)
MICRO-INDENTATION TEST (1)
MULTIOBJECTIVE OPTIMIZATION (MOO) (1)
MULTIOBJECTIVE OPTIMIZATION DESIGN (1)
MULTIPLE LOADING CASES (1)
NON-UNIFORM THICKNESS SHEET (1)
OBLIQUE IMPACTING (1)
OPTIMIZATION DESIGN (1)
PATHOGENICITY (1)
PLASTIC DEFORMATION (1)
QRT-PCR (1)
QUASI-STATIC TEST (1)
RANDOM SEARCH (1)
RECEPTOR BINDING FEATURE (1)
REPLICATION (1)
SIDE IMPACT (1)
SPOT WELDS (1)
STILBENE SYNTHASE (1)
TAGUCHI METHOD (1)
TAILOR ROLLING BLANK (TRB) (1)
TAILOR-WELDED BLANK (TWB) STRUCTURES (1)
TAILOR ROLLED BLANK (TRB) (1)
TAPERED TUBES (1)
THIN-WALLED STRUCTURE (1)
THIN-WALLED TUBES (1)
THREE-POINT BENDING TEST (1)
TRANSGENIC (1)
UPDA STRATEGY (1)
WELD ORIENTATION (1)
more

Data set

Elsevier (12)
Springer (6)
Wiley (1)

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Search results for: Fengxiang Xu

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