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81.
N.H. Scott 《Journal of Elasticity》2000,58(3):269-275
A new modulus of elasticity is defined to be the ratio of an equibiaxial stress to the relative area change in the planes
in which the stress acts. This area modulus of elasticity is intermediate in properties between Young's modulus and the bulk
modulus. Expressions for the area modulus are computed in isotropic elasticity. A simple, convenient expression for the compliance
tensor of transverse isotropy is found in terms of, amongst others, the longitudinal (axial) area modulus and this leads to
a new, concise condition for positive definiteness of the compliance tensor. The limits of incompressibility, inextensibility
and constant area are briefly considered.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
82.
V. A. Osinov 《Archive of Applied Mechanics (Ingenieur Archiv)》2009,79(1):69-80
It is known that a high degree of anisotropy in the constitutive behaviour of a solid may result in the loss of hyperbolicity
of the dynamic equations in the form of either complex-conjugate or purely imaginary characteristic wave speeds (flutter ill-posedness
and shear band formation, respectively). In the present paper we investigate the characteristic wave speeds in the dynamic
problem for a transversely isotropic fluid-saturated porous solid. Three cases are considered: a dry solid and a saturated
solid under locally undrained and drained conditions. It is shown that, for given constitutive parameters of the solid skeleton,
the dynamic problem for a drained solid may become ill-posed due to the flutter-type loss of hyperbolicity, while the dynamic
equations for a dry and an undrained solids remain hyperbolic. For a given solid skeleton, the characteristic wave speeds
are strongly influenced by the pore fluid compressibility which, in turn, is extremely sensitive to the presence of a small
amount of free gas. 相似文献
83.
On the Bending, Vibration and Stability of Laminated Rectangular Plates with Transversely Isotropic Layers 总被引:4,自引:1,他引:3
IntroductionThestaticsanddynamicsofrectangularplateshavealwaysbeenofparticularresearchinterestinsolidmechanics.Inparticular,theemergenceofnewmaterialsandnewstructureshasbroughtoutendlessvitalforceintothestudy .Itiswell_knownthattheclassicalplatetheoryb… 相似文献
84.
In this note we give a characterization of taut Riemannian foliations using the transverse divergence. This result turns out to be a convenient tool in the case of some standard examples. Furthermore, we show that a classical tautness result of Haefliger can be obtained in our particular setting as a straightforward consequence. In the final part of the paper we obtain a tautness characterization for transversally oriented foliations with dense leaves. 相似文献
85.
86.
Functional areas specialized for recognition can be activated by a non-preferred stimulus as well as a preferred stimulus. The functional magnetic resonance imaging signals detected in response to different stimuli in an area may have the same or different amplitudes. However, it is uncertain whether the responses originate from the same neuronal populations or heterogeneous ones. To address this concern, we propose a novel method that uses multi-echo echo-planar imaging sequences to evaluate changes in the transverse relaxation profile caused by stimulation. According to this method, the areas related with visual recognition, i.e. fusiform face area and parahippocampal place area, have different transverse relaxation profiles to preferred and non-preferred stimuli, which can be considered as reflecting a difference in neuronal population processing stimuli in those areas. The proposed method can be useful for probing the microscopic functional specificity of brain areas. 相似文献
87.
对氧碘化学激光器的单重态氧发生器(SOG)进行了改进,采用横向射流方式,并对该横向射流式单重态氧发生器的性能进行了检测。实验中过氧化氢碱溶液温度控制在-16℃左右,氯气流量为530mmol/s,He与氯气的流量比为3;采用PS法测量单重态氧分子的产率,吸收法测量氯气的利用率和相对水含量。得出如下结论:在不使用冷阱和分离器的情况下,最高单重态氧分子产率达到58%, 氯气利用率在80%以上,相对水含量小于等于0.5;气体达到最大流量时,发生器仍然能稳定地工作。 相似文献
88.
Mathematical Notes - 相似文献
89.
William Basener 《Topology and its Applications》2006,153(18):3627-3632
Our main result is that for a minimal flow φ on a compact manifold M, either M is a torus and the flow is topologically conjugate to an irrational flow, or M is not a torus and every parametrization of φ has sensitive dependence on initial conditions. Our results depend heavily on the work of Lopez and Candel. 相似文献
90.
Summary In this paper, the method of numerical integration along bicharacteristics is generalized to the case of layered transversely
isotropic medium for analysing the axisymmetric stress wave propagation. The stability of the present scheme is studied. The
advantages and limitations of the method are discussed.
Received 12 June 1996; accepted for publication 6 May 1997 相似文献