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2010 Vol. 31, No. 5
Published:
论文
433
Discussion on the development of solid mechanics based on the application and supported projects on mechanics of NSFC
Solid mechanics is the largest branch of mechanics. The application and supported projects of NSFC in this field were analyzed. On the basis of these, The current situations and research trends of solid mechanics were discussed, the suggestions and solutions for the development of solid mechanics were proposed.
2010 Vol. 31 (5): 433-439 [
Abstract
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672
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711
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440
Mechanical Problems on FRP Laminate Applied in Civil and Construction Repairing and Strengthening Engineering
A large number of researches and applications in civil and construction engineering have been focused on fiber reinforced plastic (or fiber reinforced polymer, FRP), because of FRP’s excellent mechanical properties and their constructional convenience. In this paper, based on some previous researches by authors and the present studies on FRP laminate (fiber sheet, fiber plate or fiber laminate) applied in civil and construction engineering for repairing and strengthening in the world, some key mechanical problems of the strengthened structures with FRP, such as the static mechanical properties, fatigue performances, the mechanical properties of the interface between FRP and RC members, and the durability of the strengthened structure are summarized and discussed. Some developmental ways are also proposed.
2010 Vol. 31 (5): 440-450 [
Abstract
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625
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671
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451
ANALYSIS ON THE STRUCTURES OF PIEZOELECTRIC HARVESTERS AND THE CORRESPONDING ELECTROMECHANICAN COUPLINGS
A novel practical technology of energy-scavenging, through electromechanical conversion of piezoelectric structures to extract energy from ambient vibrations, is introduced for the realization of wireless energy supply to microelectronic devices. These acoustic-wave devices, consisting of piezoelectric structures for energy-scavenging, are called piezoelectric harvesters which can be divided into two categories: One is called piezoelectric power harvester whose ac output power scavenged from ambient vibrations is directly supply to electronic devices without any energy-storage; the second is called piezoelectric energy harvester which possesses energy-storage function. In some applications, a microelectronic device is required to perform its duty infrequently, for example a few minutes over a long period of time. The harvesters with energy-storage function can still supply those devices after a long energy accumulation, even if they operate in a low vibration background environment. The structures of piezoelectric power/energy harvesters and the analysis methods are described in detail in the paper. The effective measures to improve the efficiency of harvesters are illustrated and the corresponding mechanisms are revealed. There is some great significance on the design and application of piezoelectric power/energy harvesters.
2010 Vol. 31 (5): 451-467 [
Abstract
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1361
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734
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468
EXPERIMENT-BASED INVERSE / IDENTIFICATION METHOD AND ITS APPLICATION TO STUDY ON MATERIAL MECHANICS PROPERTIES
This paper reviews recent advances in experiment-based inverse/identification method. In particular, the technical scheme of experiment-based inverse/identification and its application to study on material mechanics properties are introduced. Firstly, the scheme and corresponding key technicas of experiment-based inverse/identification method are proposed, and the merits and limitations of some optimization methods are presented. Then, the application of this method in interfacial damage and failure of metal matrix composite and experimental characterization on time-dependent interfacial mechanics model of adhesive structrue are discussed in detail. Meanwhile, recent advances in some material mechanics properties by inverse/identification method are presented. Finally, from the results obtained, the advantages in solving problems of mechanics properties characterization with this method are demonstrated, and several future research topics are outlined.
2010 Vol. 31 (5): 468-480 [
Abstract
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744
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597
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496
Understanding Fatigue Failure in Structural Metals in Ultra-high Cycle Regime
Most experimental studies on fatigue of structural materials are usually limited by conventional testing to lifetimes of 107 cycles or less. However, during the last decade, several unexpected failures have been recorded even for structural components made of ferrous metals, which were assumed to have a distinct fatigue limit. Consequently, there has been a growing interest especially in the recent years in studying ultra-high cycle fatigue up to 1010 cycles in various materials. This paper reviews the state of the art and presents some fundamental aspects on ultra-high cycle fatigue in structural metals. The main contents covered by the paper included: Development of accelerated fatigue testing method and its application, crack initiation and growth mechanisms of internal fracture due to very high cycle fatigue, S-N diagram, fatigue limit and life prediction, frequency and environmental effects, and surface treatments, etc. Future research topics have also been identified.
2010 Vol. 31 (5): 496-503 [
Abstract
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1361
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914
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504
FAILURE MECHANISMS AND LIFE PREDICTION OF THERMAL BARRIER COATINGS
Thermal barrier coatings (TBCs) are one of the key materials of turbines for propulsion and power generation. The failure mechanisms and life prediction of TBCs are the key problems which are urgently needed to be resolved. The TBCs research history and current status both at home and abroad are reviewed. The paper mainly introduces the recent developments of the failure mechanisms, measurement techniques, experimental and numerical simulations and life prediction models of TBCs. Finally, the development tendency of TBCs is proposed.
2010 Vol. 31 (5): 504-531 [
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746
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756
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532
RESPONSE AND PROTECTION OF MATERIALS AND STRUCTURES UDNER IMPACT LOADINGS
Response and protection of materials and structures under impact loadings are the hot topics in solid mechanics and explosion mechanics with important application background in national defense and civil protection. The present paper mainly reviews the research status and development trend of the response and protection of materials and structures under impact loadings. The content covers the dynamic characteristic, constitutive relation and the deformation and failure of some common materials and structures in weapons equipment and protection engineering, focusing on the dynamic constitutive behavior of concrete, tungsten alloy, alumina and the protection mechanism of concrete tunnel, ship, etc.
2010 Vol. 31 (5): 532-552 [
Abstract
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830
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1050
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