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2010 Vol. 31, No. 6
Published:
论文
587
THERMO-ELECTRO-CHEMO-MECHANICAL COUPLING THEORY AND ITS APPLICATION IN POROUS MEDIA
This paper presents an overview of the multi-field coupled model including chemical effects and its application in various porous media widely distributed in nature. Basic theoretical frameworks of multi-field coupled problem are discussed. Based on phenomenological theory and thermodynamics, a general thermo-electro-chemo-mechanical coupling theory is established and the simplified version for chemo-mechanical coupled problem is then derived on that basis. Using a set of governing equations and constitutive laws, a variational principle is deduced for a linearly coupled system and its closeness is proved. A several numerical examples are considered to illustrate the chemo-mechanical coupling phenomena of porous media and to verify the proposed variational theory and numerical procedure. Finally, some problems and challenges in multi-field couplings in porous media especially in living biological soft tissue are analyzed, and future trends in this field are identified.
2010 Vol. 31 (6): 587-602 [
Abstract
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1013
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1089
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603
Biomechanics of the bone and the knee joint
Osteoarthritis caused by knee sports injuries and cumulative fatigue damage is very common. The research result of biomechanical behavior of the human knee is not only important to know the etiology and pathogenesis, improve the treatment of joint diseases, but also helpful to design the knee rehabilitation and orthopedic brace. The experimental method and simulation method are mainly used in the biomechanical research of the knee joints. The finite element simulation method has been widely used in recent years, and its further development has to depend on the knowledge of macroscopic mechanical properties and microscopic structure of joint bone and tissue.
2010 Vol. 31 (6): 603-612 [
Abstract
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834
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851
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613
Mechanical Properties and Applications of Natural Fiber Reinforced Composites
In this paper, the chemical compositions, structures and mechanical properties of natural fibers were described; Surface treatments of natural fibers were reviewed, mechanisms were analyzed and their effects on the mechanical properties of natural fiber reinforced composites were discussed; Short fiber, mat, fabric and unidirectional fiber reinforced composites were introduced on the basis of different reinforcement layout and effects of fabrication process, fiber content and surface treatment on the tensile, flexural, interfacial properties, impact strength and fracture toughness were studied. Finally, current applications of natural fiber reinforced composites, including transportation and construction industry, were summarized, and the development trends and future applications were prospected.
2010 Vol. 31 (6): 613-630 [
Abstract
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862
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849
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631
STUDY ON BONDING RELIABILITY OF ELECTRICALLY CONDUCTIVE
Electrically conductive adhesive (ECA) bonding is a kind of new packaging technology developed in recent years and its reliability is crucial for the stable operation of ECA bonding assembly. Based on the failure modes of ECA joints, the mechanical properties of Anisotropic Conductive Film (ACF) are introduced and the effects of mechanical loading, environmental factors and properties of the components on the reliability of ECA joints are reviewed in the paper. Theoretical analysis of the contact resistance, bonding strength and failure probability of ECA is presented. Additionally the interfacial residual stress and fatigue life of ECA joints are discussed. Finally, the future researches are proposed for reliability of ECA joints.
2010 Vol. 31 (6): 631-642 [
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900
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696
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643
PLASTIC ANALYSES OF STRUCTURES AND FAILURE ASSESSMENT OF PRESSURE VESSELS AND PIPING WITH VOLUMETRIC DEFECTS
This paper briefly reviews the authors’ systematic research achievements over the past 20 years in their research field——plastic limit and shakedown analyses of structures and their engineering applications to safety assessment of pressure vessels and piping. Attention is focused on introducing some typical advanced numerical methods and ideas proposed by the authors, describing a general approach and procedure of applying limit and shakedown analysis theories to solve practical engineering problems and on highlighting some typical and successful engineering application cases. These results not only possess theoretical innovation and development, but also have solved the key technical problems in engineering. They form a relatively complete and general purpose application theory system in this area and have been adopted by the national standard of China（GB/T19624-2004）and technical codes of government.
2010 Vol. 31 (6): 643-663 [
Abstract
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743
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727
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664
Progress of Micro and Nano Solid Experimental Mechanics Based on the Optical and the Probe Techniques
In this article, we review recent advances in solid experimental techniques for the mechanical characterization of materials and structures at micro and nano scales with emphasis in the optical and probe techniques. Advantages and disadvantages of various approaches are discussed to highlight the need for clamping, loading, force and displacement measuring, as well as carefully designed experiments and rigorous and coupling analysis of experimentally obtained data to yield unambiguous results. By introducing typical studies we demonstrate that the development of robust and innovative experimentation and system is crucial for the tests in micro/nano experiments.
2010 Vol. 31 (6): 664-678 [
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1435
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780
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679
Recent Progress in High Temperature Mechanical Behavior of Materials and Structures
The paper reviews a decade of progress in high temperature mechanical behavior of materials and structures. The highlighted topics are multiscaling of mechanical behavior of materials at high temperature, creep mechanics of multi- component materials system, high temperature fracture under constraint and safety assessment of high temperature components. To meet the future challenges of the safe operation of high temperature plants and the development of high-tech machines, more efforts should be taken to address some critical issues, which includes correlation and transformation of the events in temporal and spatial scales: to understand the physico-chemical kinetics and the influence of external stresses; the measurement and theoretical interpretation of interfacial strength and defects at high temperature; the development of high temperature theory that takes into account the constraint effect on the stress field ahead of crack tip and creep crack growth rate; the extension of the current failure assessment diagram to cover the complexity of damage mechanisms by introducing a time-dependent damage scale.
2010 Vol. 31 (6): 679-695 [
Abstract
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847
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869
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696
Some new progresses on the research of creep and fatigue behaviors of high temperature structural materials
For the hot components suffering elevated temperature and loading conditions, creep and fatigue act as the decisive factors in controlling its service life. They’ve been the critical issues in the field of strength of high temperature structures, which has drawn increasing attention of researchers in recent years. In this paper, advances on the creep and fatigue studies of actual high temperature structures and materials have been summarized from mechanical viewpoint, including the failure mechanisms, damage evaluation, life prediction and so on. Further, some new fruits achieved by our group in the field of creep and fatigue at high temperatures are introduced. Finally, we present further directions in this research field that need to be extended in future work.
2010 Vol. 31 (6): 696-715 [
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930
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874
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716
KEY SOLID MECHANICS ISSUES AND RESEARCH PROGRESSES FOR RAILWAY VEHICLE WHEELSET
Key solid mechanics issues and research progresses relative to reliability and safety in service are reviewed based on investigations of damage modes. The modes five for wheel tread, four for wheel out of tread, five for axle and five for bearing are summarized and the corresponding causes and effects are introduced for railway wheel set. The possible solutions are discussed. And then, the three key issues and progresses are introduced. They are the fatigue reliability analysis covering super long life regime; the smooth surface short fatigue crack behaviour and structural safety assessments; and the matching in materials and morphology of the connectors between wheel tread-track. Multi-principle optimum of the wheel-track contact connector; bearing contact design and analysis considering the geometrical, loading and environmental constraints; and integrated reliability analysis and safety assessment for wheel set are prospected as the valuable fields of the future research for railway vehicle wheel set.
2010 Vol. 31 (6): 716-730 [
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771
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704
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731
Multi-scale Modeling and Analyses on Structural Deteriorating and Damage in Long-span Bridges and its Applications
It is significant to develop the method of multi-scale modeling and damage analyses on structural deteriorating in order to maintain safe and reliable service of long-span bridges. This paper summarize recent works on multi-scale modeling and analyses of long-span bridges for the popurse of evaluating structural deterorating and damage by authors and their research group. The main outcomes include that, the methodology and strategy for concurrent finite element modeling of long-span bridges at the different scale levels have been developed for the purposes of analyses on structural deteriorating. The model updating techniques with concurrent multi-objective and multi-factor optimization technique were developed for concurrently updating the multi-scale model of the bridge. The proposed procedures of multi-scale model modeling, updating and verification were applied to the model verification of Runyang bridges and Tsing Ma Bridge as an actual engineering practice of the proposed procedures. The method of numerically simulating structural deteriorating and damage involution in multiple multiple temporal and spatial scales was developed based on the developed multi-scale model and applied to the analyses on long-span bridges under service loading. At last, it is suggested that, there are some key issues to be studied in the region, such as, how to explain the damage evolution from defects in meso-scale to local fracture and bridge failure, and to develop the theory and analyses method for a trans-scale damage evolution in long-span bridges.
2010 Vol. 31 (6): 731-756 [
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1455
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676
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