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dynamic mechanical behavior, microstructure evolution, and restoration mechanism of a β‐Ti alloy during hot compression deformation

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International Journal of mechanical System dynamics 2022年第4期2卷 325-338页

作者： Xi Pan Pei Li Yang Chen Zhixiang Qi Hao Xu Yuede Cao Yuan Lei Gong Zheng Guang Chen MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology Engineering Research Center of Materials and DesignMinistry of EducationNanjing University of Science and TechnologyNanjingChina

Metastable β titanium alloys are promising materials for lightweight and energy‐efficient applications due to their high strength and low ***-mechanical processing(TMP)is one of the most effective ways to improve the mechanical properties of such *** paper describes a systematic TMP investigation on a new metastableβtitanium alloy,including its dynamic mechanical behavior,and microstructure evolution,via isothermal compression tests and electron back‐scattered diffraction *** results show that the compression stress increases with an increase in the strain rate and a decrease in the *** yielding,the compression stress-strain pattern shows flow‐softening behavior at a low temperature and a high strain rate,while sustaining a steady flow state at a high temperature and a low strain *** temperature‐rise effect contributes to a large degree of flow softening at high strain *** the correction for temperature rise,the stress-strain constitutive relationships are established,showing that the compression behavior varies in different phase *** on the microstructure characterizations,it is found that the dynamic recovery and dynamic recrystallization dominate the hot deformations inβphase region and at low strain rates,while the deformation band as an additional product is found inα+βphase region and at high strain *** results contribute to a better understanding of the TMP for the considered alloy and may also represent a useful database forβ‐Ti alloy applications in lightweight mechanical systems.

关键词： metastableβtitanium alloy dynamic mechanical behavior microstructure evolution restoration mechanism

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dynamic mechanical behavior and Prediction for PP/POE Blends

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Chemical Research in Chinese Universities 2009年第4期25卷 573-578页

作者： YING Ji-ru XIE Xiao-lin ZHOU Xing-ping ZHOU Hua-min LI De-qun State Key Laboratory of Plastic Forming Simulation and Die ＆ Mould Technology Wuhan 430074 P. R. China Hubei Key Laboratory of Materials Chemistry and Service Failure Department of Chemistry and Chemical Engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China School of Chemical and Environmental Engineering Hubei University of Technology Wuhan 430068 P. R. China

Polypropylene（PP）/ethylene-octene copolymer（POE） blends were prepared with a twin-screw *** dynamic mechanical behavior were systematically *** results show that PP/POE blends are heterogeneities with a partial compatible two-phase structure,the glass transition temperature of PP phases in the blends tends to shift towards high temperature with increasing the POE content,and the glass transition temperature of POE phases shifts towards the low temperature with increasing the PP *** Kerner＇s dispersed phase model and co-continuous phase model can reasonably predict the visco-elasticity of PP/POE blends with different ***,the morphological structure of the blends can be estimated via comparing the predicted DMA behavior with the experimental data.

关键词： PP/POE blend dynamic mechanical behavior Dispersed phase model Co-continuous phase model

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dynamic mechanical behavior of a Zr-based bulk metallic glass during glass transition and crystallization

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Rare Metals 2009年第1期28卷 72-76页

作者： CHAO Qi WANG Qing DONG Yuanda Institute of Materials Science Shanghai University Shanghai 200072 China

The dynamic mechanical behaviors of the Zr41Ti14Cu12.5Ni8Be22.5Fe2 bulk metallic glass （BMG） during continuous heating at a constant rate were investigated. The glass transition and crystallization of the Zr-based BMG were thus characterized by the measurements of storage modulus E′ and internal friction Q^-1. It was found that the variations of these dynamic mechanical quantities with temperature were interre-lated and were well in agreement with the DSC trace obtained at the same heating rate. The origin of the first peak in the internal friction curve was closely related to the dynamic glass transition and subsequent primary crystallization. Moreover, it can be well described by a physical model, which can characterize atomic mobility and mechanical response of disordered condense materials. In comparison with the DSC trace, the relative position of the first internal friction peak of the BMG was found to be dependent on its thermal stability against crys-tallization.

关键词： metallic glass dynamic mechanical behavior internal friction glass transition crystallization

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dynamic mechanical behavior of a Novel Polymeric Composite Damping Material

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Chinese Chemical Letters 2005年第11期16卷 1527-1530页

作者： Cheng ZHANG Jiang Feng SHENG Chun An MA State Key Laboratory Breeding Base for Green Chemistry Synthesis Technology Zhejiang University of Technology Hangzhou 310032

The dynamic mechanical behavior of a novel polymeric composite damping material has been investigated in this article. The composite consists of chlorinated polyethylene （CPE）, N,N-dicyclohexyl-2-benzothiazolylsufenamide （DZ）, 4,4＇-thio-bis（3-methyl-6-tert-buthylphenol）（BPSR） and vapor-grown carbon fiber （VGCF）. It is found that either the position or the intensity of damping peak can be controlled by changing the composition of CPE/DZ/BPSR composite. Within a certain composition region, damping peak maximum depends on CPE/DZ ratio, whereas damping peak position is controlled by BPSR content. Moreover, the improvement of storage modulus can be achieved by incorporation of VGCF. These results may imply that a damping material possessing both good damping properties and high strength can be designed and obtained.

关键词： dynamic mechanical behavior polymeric composite damping material.

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Design,fabrication,and dynamic mechanical responses of fiber-reinforced composite lattice materials

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International Journal of mechanical System dynamics 2023年第3期3卷 213-228页

作者： Jian Xiong Cheng Gong Qianqian Wu Li Ma Jinshui Yang Linzhi Wu Center for Composite Materials and Structures Harbin Institute of TechnologyHarbinChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina

Fiber-reinforced composites are a popular lightweight materials used in a variety of engineering applications,such as aerospace,architecture,automotive,and marine construction,due to their attractive mechanical *** lattice materials from fiber-reinforced composites is an efficient approach for developing ultra-lightweight structural systems with superior mechanical proper-ties and multifunctional *** contrast to corrugated,foam,and honeycomb core materials,composite lattice materials can be manufactured with various architectural designs,such as woven,grid,and truss ***,lattice materials with open-cell topology provide multifunctional advantages over conventional closed-cell honeycomb and foam structures and are thus highly desirable for developing aerospace systems,hypersonic vehicles,long-range rockets and missiles,ship and naval structures,and protective *** objective of this study is to review and analyze dynamic mechanical behavior performed by different researchers in the area of composite lattice materials and to highlight topics for future research.

关键词： fiber-reinforced composite lattice structures sandwich structures dynamic mechanical behavior

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dynamic Testing Technique Based on Multi-channel Photonic Doppler Velocimetry for Investigating the dynamic behavior of Materials

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Acta Mechanica Solida Sinica 2019年第6期32卷 725-736页

作者： Yuanyuan Ding Yonggang Wang Zheng Zhang Huawei Lai Key Laboratory of Impact and Safety Engineering Ministry of EducationNingbo UniversityNingbo 315211China

In the present paper,more attention is paid to develop a new optical measurement approach of split-Hopkinson pressure bar(SHPB)and wave propagation inverse analysis(WPIA)by using multi-channel photonic Doppler velocimetry(PDV).Based on the particle velocities measured by PDV,the dynamic stress-strain curve of material is obtained in SHPB *** strain is determined by the radial particle velocity of specimen,and the stress is determined by the free surface particle velocity of the transmit ted *** results obtained by the new method coincide with those obtained by the conventional strain gauge *** new method is non-intrusive and insensitive to electrical noise,making it significantly more reliable than strain *** the oblique incidence of laser beam,a series of particle velocity wave propagation signals for long rod specimen are measured *** on the measurements of particle velocity profile,the dynamic constitutive response of polymethyl methacrylate(PMMA)is det ermined by WPIA *** comparison bet ween the dynamic st ress-s train curve and the quasi-static one indicates that the strain-rate effect must be taken into account for PMMA.

关键词： dynamic mechanical behavior Photonic Doppler velocimetry Split-Hopkinson pressure bar Lagrangian analysis

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dynamic response characteristics of dry and watersaturated schist under impact loading

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Journal of Mountain Science 2020年第12期17卷 3123-3136页

作者： ZHOU Yang SU Sheng-rui CHEN Jian-xun School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710064China School of Highway Chang’an UniversityXi’an 710064China

Many geological engineering hazards are closely related to the dynamic mechanical properties of rock ***,most existing studies on the dynamic mechanical properties of rock materials were conducted on the hard rocks such as sandstone,granite,limestone,and marble,whereas soft rocks,such as schist,are less ***,in this study,a series of triaxial impact tests were conducted on dry and saturated schist by employing a modified triaxial split Hopkinson pressure bar system to reveal the coupling effects of water,strain rate,and triaxial confining pressure on the mechanical properties of *** results show that schist is a type of watersensitive rock and the stress-strain curve of saturated schist has apparent *** effects of strain rate on dynamic strain,deformation modulus and peak stress were *** results also show that the dynamic peak stress is affected by the combined softening effect and viscous effect of water under impact ***,it was found that the failure mode of schist belongs to typical axial tensile failure under uniaxial impact tests,and shear failure is the main failure mode under triaxial impact *** the increase in confining pressure,the failure modes of schist change from tensile failure to shear *** research can provide useful parameters for geological engineering hazard prevention in mountain areas.

关键词： Dry and water-saturated schist Triaxial stress constraint Modified triaxial split Hopkinson pressure bar dynamic mechanical behavior Impact loading

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