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INTRODUCTION The stress singularity may occur in an elastic solid when discontinuities are present in the geometry, materials or loads, such as cracks, multilayer media or point forces.
Bogy, Journal of Applied Mechanics, 38 (1971) p.377 4.
Theocaris, International Journal of Engineering Science, 12 (1974) p.107 5.
Yin, 42 nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference and Exhibit, Seattle, U.S.A. (2001) 14.
Ting, Anisotropic Elasticity – Theory and Application, Oxford Science Publications, New York (1996)

Journal of Materials Science, 2021, 56(23): 1-12.
Journal of Materials Science, 2021, 56(3): 1-13.
Modelling and Simulation in Materials Science and Engineering, 2021, 29(5): 055003 (19pp).
Journal of the mechanical behavior of biomedical materials, 2014, 37: 299-306.
Modelling and Simulation in Materials Science and Engineering, 2016, 24(5): 055006.

The intelligent materials is a new formed branch which follows by the stone material, steel materials, synthetic polymer materials, artificial designed materials, from the development of the material, and it enters the 5th generation materials period.
From the function materials to intelligent materials, it is a leap of material field.
Because the research results of intelligent materials will spread to the information, electronic science and technology, life sciences, universe, marine science technology and the soft science technology, and they can largely increase people's material life which increasingly attract the domestic and foreign various aspects of attention[3].
The research on intelligence material is also serious in China, and the national natural science foundation listed the intelligent materials in the national high technology development plan outline in 1991, the issues and application of intelligent materials is directly as the national high technology research and development project topic(863 program) [4].
Journal of Shanghai economic research(in China).2009(12), p.19 [5] Yu Jie.

Synthesis of AlN Nanowires and Characterization with Properties of Composite Materials LongHai Shen 1, a, Nan Wang1, b 1School of Science, Shenyang Ligong University, Shenyang, 110159, China ashenlonghai@163.com, bwangnan0602@163.com Keywords: AlN; nanowires; vapor–liquid-solid mechanism Abstract.
The experiments were carried out in a horizontal tube furnace using Al and NH3 as the source materials.
Tang: Journal of Alloys and Compounds.
Du: Journal of Crystal Growth.
Yang: Journal of Physical Chemistry C.

Materials and Methods Test materials.
In this test, the white birch fiber and potato starch were taken as the primary materials.
Journal of Materials Science & Engineering, Vol.123(2010), p.136-139 [3] Yuan-yuan Li.
Journal of Jinan University Vol. 5(1995), p. 32-37 [6] Liu zhuang, Wang yong: Study on Composite Cushioning Packing Material of Corn Stalk Flax.
Journal of Harbin University of Commerce (Natural Sciences Edition), Vol.22(2006), p.91-93

Introduction 7050-T7451 aluminum alloys are widely used as important structural materials in aerospace due to their excellent mechanical properties [1,2].
International Journal of Fatigue. 31 (2009) 11-12
International Journal of Fatigue, 66 (2014) 55-64
Materials Science and Engineering A, 527 (2010) 699-707
Materials Science and Engineering, 528 (2011) 3823-3828

Most scholars treat traffic loading as cyclic loading to study the deformation characteristic of weak geotechnical materials.
On the other hand, the test is mainly developed on particular geotechnical materials, which makes the test results have too many regional features, and can't truly reflect the essence of geotechnical materials under cyclic dynamic loading.
The two-surfaced model is first put forward by Krieg (1975) and Dafalias (1975) and is applied to metal materials.
Later, Mroze (1979) and Bardet (1985) applied this theory to describe constitutive properties of geotechnical materials under cyclic load.
A model for nonlinearly hardening materials for complex loading.

Bai has pointed out, all of these fail to predict the experimental results from engineering materials [9].
In this study, we use the Material Failure Process Analysis code (MFPA 2D ), to investigate the behaviors of fractures in layered materials.
Therefore, it is necessary to take the heterogeneity of materials into account.
In experimental study, fractures initiate at the pre-existing weakness in the materials.
We also find that heterogeneity of materials has a strong influence on the stress distribution.

Preparation and Characterization of Al/Pb Layered Composite Materials Shenggang Zhou 1,a, Peixian Zhu 1,b, Yong Sun 2,c and Lida Sun 3,d 1Faculty of Material Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan, 650093, China 2Key Lab of Advanced Materials of Precious-Nonferrous Metals of Yunnan Province, Kunming, Yunnan, 650091, China 3College of science, Honghe University, Mengzi, Yunnan, 661100, China.
Microstructure of the layered composite materials was studied by scanning electron microscope (SEM) and Energy Dispersive Spectrometer (EDS), and then the flexural strength and interface adhesion of the layered composite materials were measured.
The surface of Al-Sn-Pb layered composite materials are observed by SEM, EDS after etch polishing.
Zhu: Journal of Materials Science Vol. 287(1999), p.5873-5881 [2] ZHOU Sheng-Gang, ZHU Pei-Xian, HUANG Wen-Fang, YANG Xiu-Qin, XU Jian: Acta Phys.
Yoon: Journal of Alloys and Compounds Vol. 327(2001), p.270-274

Computation of effective material properties in smart composite materials by a symmetric Galerkin BEM M.
Piezoelectric materials are widely used in smart devices and structures like transducers, actuators and sensors.
Important applications of such materials are related to layered or laminated composites.
The fundamental solutions for linear piezoelectric materials are used in this work.
[2] Zhenhuan Li , Cheng Wang , Chuanyao Chen, Effective electromechanical properties of transversely isotropic piezoelectric ceramics with microvoids, Computational Materials Science 27, 381-392 (2003)