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Numerical simulation of tectonic stress and strain rate fields in the northeastern margin of the Tibetan Plateau in association with major fault zones

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Science China Earth Sciences 2023年第10期66卷 2353-2367页

作者： Shuhong ZHOU Huai ZHANG Yunqiang SUN Caibo HU Yaolin SHI Key Laboratory of Computational Geodynamics University of Chinese Academy of SciencesBeijing100049China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519080China Beijing Yanshan Earth Critical Zone National Research Station University of Chinese Academy of SciencesBeijing101408China College of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou350002China

A series of large strike-slip and thrust faults have developed in the northeastern margin of the Tibetan Plateau since the Late Cenozoic,with strong and active tectonic activity and frequent occurrences of large *** of regional tectonic stress distribution,strain fields,and seismic hazards has not been well *** study introduces a three-dimensional viscoelastic finite element numerical model to calculate crustal stress and strain rate fields under current tectonic *** preliminary results show that the direction of the horizontal principal compressive stress rate and compressive horizontal principal strain rate in the northeastern margin of the Tibetan Plateau rotate clockwise as a whole,and this rotation is more significant in the southeast direction because of the block of the Alxa and the Ordos *** NE-SW horizontal principal compressive stress rate and SE horizontal tensile stress rate dominate the entire study *** maximum value of the horizontal principal compressive strain rate at a depth of 0 km in the model is approximately 4×10^(-8)yr^(-1)near the East Kunlun fault and is smaller in the stable Alxa and Ordos blocks at approximately 1×10^(-8)yr^(-1).The calculated regional stress state is in good agreement with the actual focal mechanism solution,indicating that strike-slip and thrust stress fields dominate the northeastern margin of the Tibetan *** Altyn Tagh,East Kunlun,and Haiyuan faults demonstrate that the maximum shear strain rate gradually decreases eastward,and the decrease in the maximum shear strain rate value is absorbed by orogenic uplift and crustal shortening at its *** western section of the Altyn Tagh fault,west-to-middle sections of the East Kunlun fault,and west-to-middle sections of the Haiyuan fault will have high seismic hazards in the future.

关键词： Northeastern margin of the Tibetan Plateau Finite element model stress and strain fields Seismic hazard

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stress-strain characteristics of linear friction welding of TC11 and TC17 alloys

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China Welding 2015年第1期24卷 13-17页

作者：赵鹏康傅莉张田仓钟德超王佩艳 State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding Technologies Northwestern Polytechnical University Xi' an 710072 Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 Civil Engineering and Architecture Northwestern Polytechnical University Xi' an710129

Abstract Transient stress and strain fields of dissimilar titanium alloys （TCll and TC17 ） joint during linear friction welding （ LFW） were investigated by a two-dimensional model with ABAQUS/Explicit. The results showed that in the X-axis, the maximum compressive stress of 850 MPa occurred in the center zone of friction interface , and the maximum tensile stress of 190 MPa distributed at the flash; in the Y-axis, the maximum compressive stress of 1 261 MPa located at the junction region between the welding fixture and edge of the specimen, and the maximum tensile stress of 320 MPa distributed in the connecting portion between the flash and edge of the specimen. In addition, areas of plastic strain increased gradually during welding process. In the X-axis, tensile strain mainly existed at the heads of the specimens; in the Y-axis, compressive strain mainly occurred at the heads of the specimens.

关键词： linear friction welding TC11/TC17 titanium alloys joint stress and strain fields

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stress FIELD OF A DAMAGED MATERIAL NEAR THE CRACK TIP

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Acta Mechanica Sinica 1987年第3期3卷 231-238页

作者： Tang Qiheng Wang Tzuchiang (Institute of Mechanics,Academia Sinica) Institute of Mechanics Academia Sinica Taiwan

In this paper,a deformation theory of phsticity for damaged materials is *** expression for H near a crack tip is ***,the stress and strain fields near the cracktip are presented.

关键词： damaged materials deformation theory of plasticity asymptotic expression crack tip stress and strain fields

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