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The 9th National Conference on Rheology

作者：杨占宇罗迎社粟建新张永忠邓旭华陈胜铭邓瑞基马敏伟张亮 Institute of Rheological Mechanics and Material Engineering Central South University of Forestry and Technology College of Information Engineering Xiangtan University College of Electronic and Information Engineering Central South University of Forestry and Technology Institute of Fundmental Mechanics and Material Engineering Xiangtan University

＜正＞thermomechanical coupling of PVC sheet with defects under uniaxial loading at different rates and different sizes of microbores was *** local temperature field of the dynamic damage-rupture process zone at crack tip was surveyed with infrared thermographic *** on the irreversible thermomechanics theory,the dissipation law of deformation-heat effect during the whole process was ***,the effect of thermoelasticity in the initial stage of extension was explained.

关键词： thermomechanical coupling irreversible thermomechanics dissipation thermoelasticity effect

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A Coupled thermomechanical Crack Propagation Behavior of Brittle Materials by Peridynamic Differential Operator

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 339-361页

作者： Tianyi Li Xin Gu Qing Zhang College of Architectural Engineering Jiangsu Open UniversityNanjing210036China Department of Engineering Mechanics Hohai UniversityNanjing211100China

This study proposes a comprehensive,coupled thermomechanical model that replaces local spatial derivatives in classical differential thermomechanical equations with nonlocal integral forms derived from the peridynamic differential operator(PDDO),eliminating the need for calibration *** model employs a multi-rate explicit time integration scheme to handle varying time scales in multi-physics *** simulations conducted on granite and ceramic materials,this model demonstrates its *** successfully simulates thermal damage behavior in granite arising from incompatible mineral expansion and accurately calculates thermal crack propagation in ceramic slabs during *** account for material heterogeneity,the model utilizes the Shuffle algorithm andWeibull distribution,yielding results that align with numerical simulations and experimental *** coupled thermomechanical model shows great promise for analyzing intricate thermomechanical phenomena in brittle materials.

关键词： Peridynamic differential operator thermomechanical coupling heterogeneity numerical simulation

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Flexible and elastic thermal regulator for multimode intelligent temperature control

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SusMat 2023年第6期3卷 843-858页

作者： Can Chen Huitao Yu Tao Lai Jun Guo Mengmeng Qin Zhiguo Qu Yiyu Feng Wei Feng Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinP.R.China MOE Key Laboratory of Thermo-Fluid Science and Engineering School of Energy and Power EngineeringXi’an Jiaotong UniversityXi’anP.R.China

As nonlinear thermal devices,thermal regulators can intelligently respond to temperature and control heat flow through changes in heat transfer capacities,which allows them to reduce energy consumption without external ***,current thermal regulators generally based on high-quality crystallinestructure transitions are intrinsically rigid,which may cause structural damage and functional failure under mechanical strain;moreover,they are difficult to integrate into emerging soft electronic *** this study,we develop a flexible,elastic thermal regulator based on the reversible thermally induced deformation of a liquid crystal elastomer/liquid metal(LCE/LM)composite *** adjusting the crosslinking densities,the LCE foam exhibits a high actuation strain of 121%with flexibility below the nematic–isotropic phase transition temperature(TNI)and hyperelasticity above *** incorporation of LMresults in a high thermal resistance switching ratio of 3.8 over a wide working temperature window of 60◦C with good cycling *** feature originates from the synergistic effect of fragmentation and recombination of the internal LM network and lengthening and shortening of the bond line ***,we fabricate a“grid window”utilizing photic-thermal integrated thermal control,achieving a superior heat supply of 13.7℃ at a light intensity of 180mW/cm^(2)and a thermal protection of 43.4℃at 1200 mW/cm^(2).The proposed method meets the mechanical softness requirements of thermal regulatormaterials with multimode intelligent temperature control.

关键词： intelligent temperature control liquid crystal elastomer liquid metal thermal regulator thermomechanical coupling

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thermomechanical analysis of triangular zone cracks in vertical continuous casting slabs based on viscoelastic-plastic model

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Journal of Iron and Steel Research(International) 2018年第8期25卷 813-820页

作者： Juan Cheng Yan-xin Wu Yang Wang Jian-xun Fu Materials Genome Institute and State Key Laboratory of Advanced Special Steel and School of Materials Science andEngineering Shanghai University Shanghai 200444 China

The triangular zone cracks in 2101 duplex stainless steel produced by the vertical continuous caster have troubled company A for a long time. To simulate the temperature and thermal stress distributions in the solidification process of 2101 duplex stainless steel produced by the vertical continuous caster, a two-dimensional viscoelastic-plastic thermomechanically coupled finite element model was established by the secondary development of the commercial nonlinear finite element analysis software MSC Marc. The results show that the thermal stress on the surface reaches a maximum at the exit of the mould, and the highest thermal stresses at the centre of the wide face and the narrow face are 75 and 115 MPa, respectively. Meanwhile, the internal temperature of slab is still higher than the solidus temperature, resulting in no thermal stress. The slab shows different high-temperature strengths and suffers from different stresses at different positions; thus, the risk of cracking also varies. At a location of 6-8 m from the meniscus, the temperature of the triangular zone is 1270-1360℃ and the corresponding permissible high-temperature strength is about 10-30 MPa, while the thermal stress at this time is 60 MPa, which is higher than the high-temperature strength. As a result, triangular zone cracks form easily.

关键词： Vertical continuous caster Triangular zone crack thermomechanical coupling Viscoelastic-plastic model -Finite element analysis

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RECOVERY EXPERIMENTAL TECHNIQUES OF TENSILE IMPACT

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Acta Mechanica Sinica 1996年第3期12卷 243-250页

作者：夏源明周元鑫 Department of Modern Mechanics University of Science and Technology of China Hefei 230026 China

Based on loading-unloading test, tensile impact recovery experimental techniques have been developed to obtain the isothermal stress-strain curves of materials under high strain rates. The thermal softening effect can be decoupled by comparing the isothermal stress-strain curves with the adiabatic stress-strain curves at the same strain rate. In the present paper, recovery experiments of brass have been carried out on a self-designed rotating disk tensile impact apparatus. According to the parabolic strain hardening power-law thermo-viscoplastic constitutive model, strain hardening parameter, strain rates strengthening parameter and thermal softening synthetical parameter have been decoupled from experimental results. Furthermore, from these parameters, one can determine the theoretical isothermal curves and adiabatic curves at high strain rates well-coinciding the experimental results respectively. It indicates that the recovery experimental techniques of tensile impact are effective and reliable and are important means for the study of thermo-mechanical coupling. The experimental results also reveals that brass is a typical thermo-viscoplastic material.

关键词： recovery experimental technique tensile impact thermomechanical coupling

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Frictional Heat-Induced Phase Transformation on Train Wheel Surface

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Journal of Iron and Steel Research(International) 2008年第5期15卷 49-55页

作者： SU Hang PAN Tao LI Li YANG Cai-fu CUI Yin-hui JI Huai-zhong Division of Structural Material Research Central Iron and Steel Research Institute Beijing 100081 China Ma＇anshan Iron and Steel Company Limited Ma＇anshan 243000 Anhui China

By combining thermomechanical coupling finite element analysis with the characteristics of phase transformation [continuous cooling transformation （CCT） curve], the thermal fatigue behavior of train wheel steel under high speed and heavy load conditions was analyzed. The influence of different materials on the formation of the phase transformation zone of the wheel tread was discussed. The result showed that the peak temperature of wheel/track friction zone could be higher than the austenitizing temperature for braking. The depth of the austenitized region could reach a point of 0.9 mm beneath the wheel tread surface. The supercooled austenite is transformed to a hard and brittle martensite layer during the following rapid cooling process, which may lead to cracking and then spalling on the wheel tread surface. The decrease in carbon contents of the train wheel steel helps inhibit the formation of martensite by increasing the austenitizing temperature of the train wheel steel. When the carbon contents decrease from 0.7% to 0.4%, the Ac3 of the wheel steel is increased by 45 ℃, and the thickness of the martensite layer is de creased by 30 %, which is helpful in reducing the thermal cycling fatigue of the train wheel tread such as spalling.

关键词： train wheel steel thermal cycling fatigue friction martensite transformation thermomechanical coupling

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