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| 1 | Necking of Q&P Steel during Uniaxial Tensile Test with the Aid of DIC Technique显示文摘A lot of research has been focused on the necking process during the plastic deformation of sheet metals, but the localized necking is rarely distinguished form diffused necking by experiments, due to the limit of measurement equipment and method. Quenching and Partitioning (Q&P) steel is a 3rd generation advanced high strength steel (AHSS). Its good combination of high strength and ductility ensures potential application in automobile industry. Uniaxial tensile tests of QP980 steel sheet at five strain rates are performed to investigate the necking process and the effect of strain rate on necking behavior of Q&P steel. Digital image correlation (DIC) method is applied during tensile tests, and evolutions of major strain, minor strain and normal strain distributions along gauge section of the tensile specimens are obtained. The diffused and localized necking strains are determined according to SWIFT necking theory and HILL necking theory respectively. The test results indicate that with the increasing of strain rate in the investigated range, the diffused necking strain decreases from 0.152 to 0.120 and localized necking strain decreases from 0.245 to 0.137. Meanwhile, the difference of the two strains decreases form 0.096 to 0.017. Thus it can be concluded that strain rate has an influence on both necking strains during the deformation of QP980 steel sheet. Diffused and localized necking strains are determined by uniaxial tensile tests with the aid of DIC technique and the effect of strain rate on necking strains is evaluated. | DING Lei LIN Jianping MIN Junying PANG Zheng YE You | 2013 | Chinese Journal of Mechanical Engineering2013，26，3： | 11 |
| 2 | Investigation on Uniaxial Tensile Instability of USIBOR1500 Steel Sheets at Elevated Temperature显示文摘In the sheet forming process with stretch, diffuse instability and localized instability usually occur in the process one after another. The necking rate has a great impact on the instability process and the forming limits of the rate sensitive material, such as USIBOR1500 steel sheets at elevated temperature. The available reports about this steel mainly focus on hot uniaxial tensile, martensitic transformation and forming process, but there are few investigations on instability behavior and forming limits. Based on Inoue Kachiro’s flow stress constitutive model at elevated temperature, combined with Swift’s diffuse instability rule and Hill’s localized instability rule, the relation is theoretically deduced between the diffuse necking rate along with the localized necking rate and the exponent of strain rate sensitivity together with the strain rate in the case of the USIBOR1500 steel sheets at elevated temperature. According to the time–temperature characteristics of the hot stamping process, tensile tests of the steel sheets were carried out on Gleeble3800, and the stress–strain curves were obtained at different temperatures and different strain rates. Then the values of the exponent of strain rate sensitivity and the hardening exponent were obtained through fitting the curves by least squares. The tests also helped to provide the distribution laws of the major strain of the specimens and the uniform strains as well as the necking width. The uniform strains obtained from the tests are matched well with the theoretical calculations. | MIN Junying LIN Jianping TIAN Haobin SUN Guohua XU Zhou | 2010 | Chinese Journal of Mechanical Engineering2010，23，1： | 9 |
| 3 | Prediction of Cross-Tension Strength of Self-Piercing Riveted Joints Using Finite Element Simulation and XGBoost Algorithm显示文摘Self-piercing riveting(SPR)has been widely used in automobile industry,and the strength prediction of SPR joints always attracts the attention of researchers.In this work,a prediction method of the cross-tension strength of SPR joints was proposed on the basis of finite element(FE)simulation and extreme gradient boosting decision tree(XGBoost)algorithm.An FE model of SPR process was established to simulate the plastic deformations of rivet and substrate materials and verified in terms of cross-sectional dimensions of SPR joints.The residual mechanical field from SPR process simulation was imported into a 2D FE model for the cross-tension testing simulation of SPR joints,and cross-tension strengths from FE simulation show a good consistence with the experiment result.Based on the verified FE model,the mechanical properties and thickness of substrate materials were varied and then used for FE simulation to obtain cross-tension strengths of a number of SPR joints,which were used to train the regression model based on the XGBoost algorithm in order to achieve prediction for cross-tension strength of SPR joints.Results show that the cross-tension strengths of SPR steel/aluminum joints could be successfully predicted by the XGBoost regression model with a respective error less than 7.6%compared to experimental values. | Jianping Lin Chengwei Qi Hailang Wan Junying Min Jiajie Chen Kai Zhang Li Zhang | 2021 | Chinese Journal of Mechanical Engineering2021，34，2： | 8 |
| 4 | Constitutive Model of Friction Stir Weld with Consideration of its Inhomogeneous Mechanical Properties显示文摘In practical engineering, finite element(FE) modeling for weld seam is commonly simplified by neglecting its inhomogeneous mechanical properties. This will cause a significant loss in accuracy of FE forming analysis, in particular, for friction stir welded(FSW) blanks due to the large width and good formability of its weld seam. The inhomogeneous mechanical properties across weld seam need to be well characterized for an accurate FE analysis. Based on a similar AA5182 FSW blank, the metallographic observation and micro-Vickers hardness analysis upon the weld cross-section are performed to identify the interfaces of different sub-zones, i.e., heat affected zone(HAZ), thermal-mechanically affected zone(TMAZ) and weld nugget(WN). Based on the rule of mixture and hardness distribution, a constitutive model is established for each sub-zone to characterize the inhomogeneous mechanical properties across the weld seam. Uniaxial tensile tests of the AA5182 FSW blank are performed with the aid of digital image correlation(DIC) techniques. Experimental local stress-strain curves are obtained for different weld sub-zones. The experimental results show good agreement with those derived from the constitutive models, which demonstrates the feasibility and accuracy of these models. The proposed research gives an accurate characterization of inhomogeneous mechanical properties across the weld seam produced by FSW, which provides solutions for improving the FE simulation accuracy of FSW sheet forming. | ZHANG Ling MIN Junying WANG Bin LIN Jianping LI Fangfang LIU Jing | 2016 | Chinese Journal of Mechanical Engineering2016，29，2： | 2 |
| 5 | Effect of Atmospheric Pressure Plasma Treatment on the Lap-Shear Strength of Adhesive-Bonded Sheet Molding Compound Joints显示文摘Atmospheric pressure plasma treatment(APPT)technology was used herein to treat sheet molding compound(SMC)substrates to increase the lap-shear strength of adhesive-bondedSMCjoints.Further,the mechanisms behind the lap-shear strength improvements in APPT-treated adhesive-bonded SMC joints were explored.A maximum lap-shear strength about three times that of the as-received SMC joints was achieved when the APPT distance was set to 20 mm.The surface roughness,which exhibited little benefit to the lap-shear strength,was determined to not be the primary reason for the increase in lap-shear strength.Specifically,X-ray photoelectron spectra revealed that an increased amount of O-containing groups(i.e.,C–O–H,C–O–C,H–O–C=O or R–O–C=O)following APPT contributed to the improved lap-shear strength.In addition,the surface free energy increased significantly after APPT,which improved the lap-shear strength of the adhesive-bonded SMC joints.Compared to the change of surface morphology,the changes in both the surface chemical property and surface free energy played larger roles in increasing the lap-shear strength of APPT-treated SMC joints. | Shuang Wang Junying Min Jianping Lin Chengcheng Sun Shanglu Yang | 2018 | Automotive Innovation2018，1，3： | 2 |
| 6 | First-principles calculation of compensated (2N,W) codoping impacts on band gap engineering in anatase TiO2显示文摘 | LI Min ZHANG Junying ZHANG Yue | | 0，，： | 1 |
| 7 | An iron-dependent form of non-canonical ferroptosis induced by labile iron显示文摘Ferroptosis is a recently identified iron-dependent form of nonapoptotic cell death characterized by reactive oxygen species(ROS) generation and lipid peroxidation.Here,we report a novel iron-dependent form of ferroptosis induced by labile iron and investigate the mechanism underlying this process.We find that labile iron-induced ferroptosis is distinct from canonical ferroptosis and is linked to the mitochondrial pathway.Specifically,the mitochondrial calcium uniporter mediates the ferroptosis induced by labile iron.Interestingly,cells undergoing labile iron-induced ferroptosis exhibit cytoplasmic features of oncosis and nuclear features of apoptosis.Furthermore,labile iron-induced ferroptosis involves a unique set of genes.Finally,labile ironinduced ferroptosis was observed in liver subjected to acute iron overload in vivo.Our study reveals a novel form of ferroptosis that may be implicated in diseases caused by acute injury. | Yanmeng Li Qin Ouyang Wei Chen Ke Liu Bei Zhang Jingyi Yao Song Zhang Junying Ding Min Cong Anjian Xu | 2023 | Science China(Life Sciences)2023，66，3： | 1 |
| 8 | Production of PEX protein from QM7 cells cultured8in polymer scaffolds in a Taylor-Couette bioreactor显示文摘 | Jian Qiao Chi Min Junie Lew Arunachalam Karthikeyan | 2014 | Biochemical Engineering Journal2014，88，： | 1 |
| 9 | Flexural Performance of Steel-FRP Composites for Automotive Applications显示文摘The design of hybrid structure offers an attractive solution to enhance strength and structural stiffness as well as to achieve lightweight effect and cost reduction.The applications of steel-FRP(fiber-reinforced polymer)composites in trans-portation and civil engineering have been comprehensively reviewed.In order to apply hybrid structures to car body parts such as B-pillar,flexural performance of steel-FRP composites is investigated by means of three-point bending test in this study.An analytical model is deduced to calculate the initial stiffness,the bending load and the energy absorption of steel-FRP composites.Steel-CFRP(carbon fiber-reinforced polymer)and steel-AFRP(aramid fiber-reinforced polymer)composites are experimentally studied and discussed.The results demonstrate that the steel-FRP composites exhibit significantly higher load-carrying capabilities and initial stiffnesses along with larger energy absorptions in the bending process compared to the single steel sheet. | Ye Lin Junying Min Hao Teng Jianping Lin Jiahao Hu NanjieXu | 2020 | Automotive Innovation2020，3，3： | 1 |
| 10 | Investigation on Yield Behavior of 7075‑T6 Aluminum Alloy at Elevated Temperatures显示文摘Aluminum alloys have drawn considerable attention in the area of automotive lightweight.High strength aluminum alloys are usually deformed at elevated temperatures due to their poor formability at room temperature.In this work,the yield behavior of 7075 aluminum alloy in T6 temper(AA7075-T6)within the temperature ranging from 25°C to 230°C was investigated.Uniaxial and biaxial tensile tests with the aid of induction heating system were performed to determine the stress vs.strain curves and the yield loci of AA7075-T6 at elevated temperatures,respectively.Von Mises,Hill48 and Yld2000-2d yield criteria were applied to predicting yield loci which were compared with experimentally measured yield loci of the AA7075-T6.Results show that yield stress corresponding to the same equivalent plastic strain decreases with increasing temperature within the investigated temperature range and the shape of yield loci evolves nearly negligibly.The experimental yield locus expands with an increase of equivalent plastic strain at the same temperature and the work hardening rate of AA7075-T6 exhibits obvious stress-state-dependency.The nonquadratic Yld2000-2d yield criterion describes the yield surfaces of AA7075-T6 more accurately than the quadratic von Mises and Hill48 yield criteria,and an exponent of 14 in the Yld2000-2d yield function gives the optimal predictions for the AA7075-T6 at all investigated temperatures. | Jianping Lin Xingyu Bao Yong Hou Junying Min Xinlei Qu Zhimin Tao Jiajie Chen | 2020 | Chinese Journal of Mechanical Engineering2020，33，5： | 1 |
| 11 | Investigation on hot forming limits of high strength steel 22MnB5 显示文摘 | Min Junying Lin Jianping Li Jiayue | 2010 | Computational Materials Science2010，49，： | 1 |
| 12 | Special Issue on Automotive Lightweight显示文摘Lightweight is one of the core technologies to realize energy saving,to improve the safety and driving performance of vehicles,and to provide added passenger comfort as well.It is of special significance for increasing cruising range of electric or hybrid-powered vehicles.Beyond these,lightweight components use less mass and hence reduce the primary energy requirement imbedded in the component.Therefore,lightweight has always been a central topic and an important direction in the automotive field whether in the past or in the future. | A.Erman Tekkaya Junying Min | 2020 | Automotive Innovation2020，3，3： | 0 |
| 13 | A Novel CAPP System Based on SML for Variant Design of Process Planning显示文摘The production model of“multi-specification and low-quantity”is becoming the main trend of manufacturing industry.As a key activity in the manufacturing chain,traditional computer aided process planning(CAPP)system fails to adapt to the production model of customization.Therefore,a novel method for variant design of process planning was proposed to develop CAPP system based on Tabular Layouts of Article Characteristics(Sach-Merk Leisten in German and SML for short). With the support of standard database of master process planning documents which are developed by parameterization technique, and instance process planning for special product(instance product)can be generated automatically by the sub-system of variant de- sign of process planning.Finally,a CAPP system was developed for process design of rotor of steam turbine to validate the feasibil- ity and applicability of the method. | ZHAO Haibin~1 WANG Junying~1 ZHANG Min~2 (1.Department of Precision Instruments & Mechanology,Tsinghua University,Beijing 100084,China, 2.Department of Mechanical Equipment & Control Engineering,Beijing University of Science and Technology,Bejing 100083,China) | 2006 | 武汉理工大学学报2006，28，S3： | 0 |
| 14 | Elevated peripheral levels of receptor-interacting protein kinase 1(RIPK1)and IL-8 as biomarkers of human amyotrophic lateral sclerosis显示文摘Amyotrophic lateral sclerosis(ALS)is a devastating fatal neurodegenerative disease with no cure.Receptor-interacting protein kinase 1(RIPK1)has been proposed to mediate pathogenesis of ALS.Primidone has been identified as an old drug that can also inhibit RIPK1 kinase.We conducted a drug-repurposing biomarker study of primidone as a RIPK1 inhibitor using SOD1G93A mice and ALS patients.SOD1G93A mice treated with primidone showed significant delay of symptomatic onset and improved motor performance.One-hundred-sixty-two ALS participants dosed daily with primidone(62.5 mg)completed 24-week follow-up.A significant reduction was showed in serum levels of RIPK1 and IL-8,which were significantly higher in ALS patients than that of healthy controls(P<0.0001).Serum RIPK1 levels were correlated positively with the severity of bulbar symptoms(P<0.05).Our study suggests that serum levels of RIPK1 and IL-8 in peripheral can be used as clinical biomarkers for the activation of RIPK1 in central nervous system in human ALS patients.Repurposing primidone may provide a promising therapeutic strategy for ALS.The effect of primidone for the treatment of other inflammatory diseases may also be considered,since the activation of RIPK1 has been implicated in mediating a variety of inflammatory diseases including COVID-19-associated cytokine release syndrome(CRS).(ChiCTR2200060149). | Jun Wei Min Li Zhi Ye Xinqian Hu Xiaoyan He Jia Wang Gaofeng Chen Chengyu Zou Daichao Xu Hongbing Zhang Junying Yuan Yunhong Zha | 2024 | Signal Transduction and Targeted Therapy2024，9，1： | 0 |
| 15 | Preface for Feature Topic on Environmentally Benign Automotive Lightweighting显示文摘To address the pressing energy and environmental challenges and accelerate the realization of the“Carbon Net Zero”concept,the role of Environmentally Benign Automotive Lightweighting is crucial.Among the various technologies available,automotive lightweighting technologies not only contribute to the“Carbon Net Zero”process,but also extend the range of electric and hybrid-powered vehicles.Moreover,the implementation of environmentally-friendly technologies greatly improves the safety and overall performance of automobiles. | Junying Min A.Erman Tekkaya Yongbing Li Yannis P.Korkolis Ying Zhao | 2023 | Automotive Innovation2023，6，3： | 0 |
| 16 | Low‑Carbon‑Emission Hot Stamping:A Review from the Perspectives of Steel Grade,Heating Process,and Part Design显示文摘Hot stamping steels have become a crucial strategy for achieving lightweighting and enhancing crash safety in the automo-tive industry over the past two decades.However,the carbon emissions of the materials and their related stamping processes have been frequently overlooked.It is essential to consider these emissions during the design stage.Emerging materials and technologies in hot stamping pose challenges to the automotive industry's future development in carbon emission reduc-tion.This review discusses the promising materials for future application and their special features,as well as the emerging manufacturing and part design processes that have extended the limit of application for new materials.Advanced heating processes and corresponding equipment have been proven to improve heating efficiency and control temperature uniformity.The material utilization and the overall performance of the components are improved by tailored blanks and an integrated part design approach.To achieve low-carbon-emission(LCE)hot stamping,it is necessary to systematically consider the steel grade,heating process,and part design,rather than solely focusing on reducing carbon emissions during the manufacturing process stage.This review aims to present the latest progress in steel grade,heating process,and part design of hot stamping in the automotive industry,providing solutions for LCE from a holistic perspective. | Zeran Hou Yi Liu Qi He Jianfeng Wang Junying Min | 2023 | Automotive Innovation2023，6，3： | 0 |
| 17 | Non‑associated and Non‑quadratic Characteristics in Plastic Anisotropy of Automotive Lightweight Sheet Metals显示文摘Lightweight sheet metals are highly desirable for automotive applications due to their exceptional strength-to-density ratio.An accurate description of the pronounced plastic anisotropy exhibited by these materials in finite element analysis requires advanced plasticity models.In recent years,significant efforts have been devoted to developing plasticity models and numeri-cal analysis methods based on the non-associated flow rule(non-AFR).In this work,a newly proposed coupled quadratic and non-quadratic model under non-AFR is utilized to comprehensively investigate the non-associated and non-quadratic characteristics during the yielding of three lightweight sheet metals,i.e.,dual-phase steel DP980,TRIP-assisted steel QP980,and aluminum alloy AA5754-O.These materials are subjected to various proportional loading paths,including uniaxial tensile tests with a 15°increment,uniaxial compressive tests with a 45°increment,in-plane torsion tests,and biaxial tensile tests using laser-deposited arm-strengthened cruciform specimens.Results show that the non-AFR approach provides an effective means for accurately modeling the yield behavior,including yield stresses and the direction of plastic strain rates,simultaneously,utilizing two separate functions and a simple calibration procedure.The introduction of the non-quadratic plastic potential reduces the average errors in angle when predicting plastic strain directions by the quadratic plastic potential function.Specifically,for DP980,the average error is reduced from 3.1°to 0.9°,for QP980 it is reduced from 6.1°to 3.9°,and for AA5754-O it is reduced from 7.0°to 0.2°.This highlights the importance of considering the non-quadratic characteristic in plasticity modeling,especially for aluminum alloys such as AA5754-O. | Yong Hou Junying Min Myoung‑Gyu Lee | 2023 | Automotive Innovation2023，6，3： | 0 |
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