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61.
The first part of the paper deals with homogenization models of unidirectional composites, in which each phase of the material
is bounded by parallel cylindrical surfaces. For a GFRP with epoxy resin and glass fibres, five elastic constants for six
models of the composite are calculated. In the second part, the results of strain gauge tests, photoelasticity investigations,
and scanning electron inspection are discussed. With these data, some elastic constants of the composite in tension and compression
are found. A comparison of experimental and analytical results is presented.
Russian translation published in Mekhanika Kompozitnykh Materialov, Vol. 44, No. 2, pp. 195–206, March–April, 2008. 相似文献
62.
By measuring stresses in cylinders with no stress gradient in axial direction, the cross-section of the cylinder may be considered
as consisting of concentric rings in each of which the stresses are constant. Axial stress distribution in the cylinder is
determined stepwise starting with the outermost ring (the so-called onion-peeling method). This paper generalizes the onion-peeling
method for the case of axisymmetric stress distributions when stress gradient in the axial direction is present. Measurement
of the integrated isoclinic and optical retardation is carried out in two parallel sections which are perpendicular to the
specimen axis, Δz apart from each other. The distributions of the axial stress and shear stress are determined directly from the measurement
data, using linear approximation of integrated photoelasticity. Other stress components are determined using the equilibrium
equation and the compatibility equation (if stresses are due to external loads) or using the generalized sum rule (if residual
stresses in glass are measured). The method is less sensitive to measurement errors than the Abel inversion. In comparison
with the polynomial approximation of the stress distributions, the onion-peeling method gives more adequate results if stress
distribution is not smooth. The paper is illustrated with several applications. 相似文献
63.
64.
《Mathematical Methods in the Applied Sciences》2018,41(8):3103-3116
An exact knowledge of the mechanical and optical properties of crystals allows not only for theoretical advances, but it is also a useful tool to asses crystal quality in the technological processes of growth and production of advanced crystals like, eg, scintillators. In this paper, we study the elasto‐optic behavior of tetragonal crystals to evaluate the photoelastic constants, associated to various states of stress, in terms of the components of the piezo‐optic tensor. Moreover, we arrive at a generalization, for tetragonal crystals, of the Brewster law for optically isotropic materials. 相似文献
65.
Stress Concentration in an Orthotropic Plate with a Circular Hole under Dynamic Loading 总被引:2,自引:0,他引:2
The paper sets forth a photoelastic method for the determination of the dynamic stress concentration factor near a hole in an orthotropic plate. The stress distribution at the periphery of a circular hole is analyzed. The stress concentration factors for orthotropic and isotropic plates under dynamic and statical loading are compared 相似文献
66.
67.
不耦合装药爆炸应力场的动光弹研究 总被引:1,自引:0,他引:1
用动光弹方法定量研究了多个不耦合系数下爆炸应力场衰减规律。模型材料为环氧树脂平板。研究表明:当不耦合系数在1~1.75之间取值时,比例距离在15~60范围内,|(?)/(?)|max的值介于3.21~5.00之间,|(?)/(?)|max的值介于小4.61~9.50之间。 相似文献
68.
69.
本文提出一种求解平面接触应力最大值的光弹性—数值计算组合方法,仅从光弹性等差线上采集实验数据,然后用牛顿—拉斐逊技术与最小二乘法相结合计算出结果。文中推导了控制方程,阐述了方法,研究了实验数据取值区域、取值个数以及接触长度测试误差等因素的影响。用两类平面接触问题作为应用实例,结果符合工程要求的精度。 相似文献
70.
M. P. Malezhik O. P. Malezhik A. I. Zirka I. S. Chernyshenko 《International Applied Mechanics》2005,41(12):1399-1406
The method of dynamic photoelasticity is used to study the dynamic failure of structural members in the form of plates with
a curvilinear (circular or elliptic) hole and an isolated crack under impulsive loading. The time-dependences of the stress
intensity factors and the crack tip velocity are investigated for two types of models
__________
Translated from Prikladnaya Mekhanika, Vol. 41, No. 12, pp. 84–92, December 2005. 相似文献