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Dynamic stress accumulation model of granite residual soil under cyclic loading based on small-size creep tests

Journal of Central South University 2019年第3期26卷 728-742页

作者： TANG Lian-sheng ZHAO Zhan-lun CHEN Hao-kun WU Yan-ping ZENG Yu-chao School of Earth Sciences and Engineering Sun Yat-sen University Guangdong Provincial Key Lab of Geodynamics and Geohazards

The creep behaviors of granite residual soil with pre-stress of 100 kPa was investigated by a series of small size creep tests. Three different types of strain curves were obtained at different stress levels. Based on creep characteristics of the granite residual soil under different stress levels, a creep model of the granite residual soil was established by rheological theory, and related parameters of the model were determined according to the experimental data at the same time. Further on, based on the established creep model, a theoretical model of dynamic stress accumulation in the granite residual soil under cyclic loading was deduced. It is found that there is a threshold of dynamic stress accumulation in this theoretical model. The dynamic stress accumulation laws of the granite residual soil are different under different cyclic loading stress. Finally, with the dynamic stress accumulation laws in the small-size samples of granite residual soil under different cycle loading studied and the experimental results comparing with the theoretical results, it verifies the validity of the theoretical model.

关键词： granite residual soil creep tests dynamic stress accumulation model

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Experimental determination of mechanical properties and short-time creep of AISI 304 stainless steel at elevated temperatures

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International Journal of Minerals,Metallurgy and Materials 2010年第1期17卷 39-45页

作者： Josip Brnic Ji-tai Niu Goran Turkalj Marko Canadija Domagoj Lanc Faculty of Engineering University of Rijeka School of Material and Chemical Engineering Zhongyuan University of Technology

The high temperature properties of AISI 304 stainless steel were studied. Basic data about the employed experimental equipment, testing procedures, and specimen geometry were given. The experimental setup was used to obtain stress-strain diagrams from tensile tests at room temperature as well as several elevated temperatures. Furthermore, the specimens were subjected to short-time creep tests at various temperatures. Stress levels for creep testing were established as a percentage of yield stress. The results indicate that at lowered temperatures and lower stress levels, AISI 304 stainless steel can be used as a sufficiently creep resistant material.

关键词： AISI 304 mechanical properties elevated temperature creep tests constitutive model

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An insight into Mg alloying effects on Cu thin films:microstructural evolution and mechanical behavior

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Journal of Materials Science & Technology 2020年第22期54卷 101-112页

作者： G.Y.Li L.F.Cao J.Y.Zhang X.G.Li Y.Q.Wang K.Wu G.Liu J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'an710049China International Joint Laboratory for Light Alloys(Ministry of Education) College of Materials Science and EngineeringChongqing UniversityChongqing400044China Electron Microscopy Center of Chongqing University Chongqing UniversityChongqing400044China

How to design ultra-strong,light-weight Cu alloys is a long-term pursuit in materials community,which is technically superior and cost-effective for their promising energy-saving *** this work,we prepared Cu-Mg alloyed thin films to study light element Mg alloying effects on the microstructure,hardness and strain rate sensitivity(SRS) of nanocrystalline Cu thin *** the studied Mg concentrationrange spanning from 0 at.% to 16.8 at.%,both the grain size and the twin spacing decrease monotonously with increasing Mg composition while Cu-2.8 at.% Mg sample has the highest twin fraction of ~75%.A combined strengthening model was employed to quantify the Mg concentration-dependent hardness of nanotwinned(NT) Cu-Mg thin films,in which the grain/twin boundary facilitates strengthening while the solute Mg atoms induce *** the constant rate of loading tests and the nanoindentation creep tests uncover that compared with pure Cu samples,the NT Cu-Mg thin films manifest much lower SRS,particularly in the creep tests,owing to the activation of dynamic strain aging effects.

关键词： Cu-Mg thin films Microstructure evolution creep tests Hardness Strain rate sensitivity

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Influence of Interface on the Behavior of Polypropylene Reinforced with Short Glass Fibers

Influence of Interface on the Behavior of Polypropylene Rein...

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第十三届国际复合材料会议

作者： E.Ségard S.Benmedakhene A.Laksimi D.Laǐ Université de Technologie de Compiègne Laboratoire Roberval UMR CNRS Polymères et composites BP 20529 60205 Compiègne France Université de Technologie de Compiègne Laboratoire Roberval UMR CNRS Polymères et composites BP 20529 60205 Compiègne France Université de Technologie de Compiègne Laboratoire Roberval UMR CNRS Polymères et composites BP 20529 60205 Compiègne France Université de Technologie de Compiègne Laboratoire Roberval UMR CNRS Polymères et composites BP 20529 60205 Compiègne France

＜正＞Tensile tests and tensile creep-recovery tests are realized on polypropylene with 40% in mass of short glass fibers. The quality of interface matrix-fibers influence the elastic, viscoelastic and viscoplastic behavior of materials （1）. Tensile tests The study is realized on the polypropylene reinforced with 40% in mass of short glass fiber. We considered two types of fiber which are traeted and untreated short glass fiber. In the first time, monotonous uniaxial tensile tests until fracture with imposed displacement, were carried

关键词： polypropylene treated and untreated short glass fibers interface monotonous tensile tests creep tests creep-recovery tests damage acoustic emission

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