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INTRODUCTION Since the phenomenon of piezoelectricity in natural crystals was discovered in 1880, it has been applied in many fields, such as smart structure, sensing devices and active control, because of its special properties. Combining electrical behavior with mechanical deformation is the special property which attracted great interest of researchers. Many models have been developed for studying piezoelec- tric effects. Dunn and Wienecke (1996) used Green’s functions for transverse… 相似文献
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Pure bending of simply supported circular plate of transversely isotropic functionally graded material 总被引：3，自引：0，他引：3
LI Xiang-yu DING Hao-jiang CHEN Wei-qiu 《浙江大学学报(A卷英文版)》2006,7(8):1324-1328
INTRODUCTION In recent years, functionally graded materials (FGMs) have attracted more and more attention. Due to their continuously varying material properties in space on the macroscopic scale, FGMs, therefore, are usually superior to conventional fiber-matrix materi-als in mechanical behavior, especially for perform-ance under thermal loading. Now FGMs have been widely used in various fields including electronics, chemistry, optics, biomedicine, etc. Heretofore, volumes of literatu… 相似文献
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Biot's two-phase theory for fluid-saturated porous media was applied in a study carried out to investigate the influence of water saturation on propagation of elastic wave in transversely isotropic nearly saturated soil. The characteristic equations for wave propagation were derived and solved analytically. The results showed that there are four waves: the first and second quasi-longitudinal waves (QP1 and QP2), the quasi-transverse wave (QSV) and the anti-plane transverse wave (SH). Numerical results are given to illustrate the influence of saturation on the velocity, dispersion and attenuation of the four body waves. Some typical numerical results are discussed and plotted. The results can be meaningful for soil dynamics and earthquake engineering. 相似文献
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李凤高 《河北北方学院学报(社会科学版)》1994,(6)
取有限域 F_q上2×2 2维伪辛空间中（2,0,0,0）型子空间作为处理,构作了具有4个结合类的结合方案和PBIB设计,并且计算了它们的参数。 相似文献
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Let K be a 1-unconditional convex bodies in Euclidean spaces. We study the asymptotic properties of two affine invariants m2(K) and S2(K) for a random simplex inside K. As an application, we discuss the asymptotic properties of two affine invariants m2(Bnp) and S2(Bnp), where Bnp = {χ∈ Rn: ‖χ‖p ≤ 1}. 相似文献
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马良财 《佳木斯教育学院学报》2012,(12):15-15
本文对各向同性晶体中电光探测过程进行了详细的数学描述,推导出了电光探测信号与太赫兹致晶体双折射的线性关系式。给出了四分之一波片与沃拉斯顿棱镜间的最佳布局方式。 相似文献
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CHEN Jiang-ying CHEN Wei-qiu 《浙江大学学报(A卷英文版)》2007,8(7):1038-1043
The analytical solution for an annular plate rotating at a constant angular velocity is derived by means of direct displacement method from the elasticity equations for axisymmetric problems of functionally graded transversely isotropic media. The displacement components are assumed as a linear combination of certain explicit functions of the radial coordinate, with seven undetermined coefficients being functions of the axial coordinate z. Seven equations governing these z-dependent functions are derived and solved by a progressive integrating scheme. The present solution can be degenerated into the solution of a rotating isotropic functionally graded annular plate. The solution also can be degenerated into that for transversely isotropic or isotropic homogeneous materials. Finally, a special case is considered and the effect of the material gradient index on the elastic field is illustrated numerically. 相似文献
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Let K be a 1-unconditional convex bodies in Euclidean spaces.We study the asymptotic properties of two affine invariants m2（K） and S2（K） for a random simplex inside K.As an application,we discuss the asymptotic properties of two affine invariants m2（Bpn ） and S2（Bpn ）,where Bpn = {x ∈ Rn ： ‖x‖ p 1}. 相似文献
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In this study, Fabrikant (1989, 1991)'s new results in potential theory were used to obtain the exact and complete solution
for the problem of a penny-shaped crack in an infinite transversely isotropic piezoelectric body subjected to antisymmetric
point loads (point charges and normal point forces); then the complete solution for the problem of one-sided loading of a
penny-shaped crack was obtained by the superposition of the symmetric loading solution in Chen and Shioya (1999) and the antisymmetric
one presented here; and then the reciprocity theorem of piezoelectric media was used to deal with the problem of interaction
between arbitrarily located point forces and a point charge with a penny-shaped crack and obtained the exact expressions of
the crack faces' normal displacement in terms of elementary functions and some non-singular integrals; and finally obtained
the normal displacement of the positive and negative faces of the crack under many loading cases as shown in figures for an
infinite PZT-4 piezoelectric ceramic body weakened by a penny-shaped crack.
Project (19872060) supported by the Natural Science Foundation of China. 相似文献