منابع مشابه
The Use of Acoustoelastic Measurements to Characterize the Stress States in Cracked Solids
The theory of acoustoelasticity predicts that a plane longitudinal acoustic wave passing through a solid which is already in a deformed state will propagate with a velocity (v) which is different from the (v0) of the same wave propagating through the undeformed medium. It may be shown that b.v/vo = (v-vo)/vo = B(o1+o2l where o1 and o2 are the principal stress in the plane normal to the wave pro...
متن کاملAcoustic Nondestructive Evaluation of Energy Release Rates in Plane Cracked Solids
Acoustic measurements, using longitudinal waves in plane specimens, based on the theory of acoustoe~asticity, permit the determination of the sum of the principal stresses (crl + cr2). By automatic scannlng, we are able to make such measurements throughout a region of interest. In this paper we shall be concerned with the application of this acoustoelastic stress analysis to fracture mechanics....
متن کاملUsing Gsc Theory for Effective Thermal Expansion and Pyroelectric Coefficients of Cracked Piezoelectric Solids
Many brittle materials, such as concrete, piezoelectricity, have a large number of preexisting microcracks, The determination of their effective material properties has been the focus of considerable research. Current research into the development of effective material properties has mostly concentrated on the Taylor's method[l], the self-consistent method[2], the differential theory[3], the Mo...
متن کاملTwo Micromechanical Models in Acoustoelasticity: a Comparative Study
Herein we derive, under the micromechanical model we propose earlier (C. a complete set of for-mulae for the twelve material constants in the acoustoelastic constitutive equation for orthorhombic aggregates of cubic crystallites. We present also a second model and compare its predictions on the material constants with those of the rst model. Both these models lead to constitutive equations whic...
متن کاملBehavior of cracked materials
Abstract. Due to their microstructure, quasi brittle materials present rough cracks. Under sliding of the crack lips, this roughness involves in one hand induced opening and in the other hand some apparent plasticity which is due to the interlocking of the crack lips combined with Coulomb’s friction. The proposed model is written under the irreversible thermodynamics framework. Micromechanics u...
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1997
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1997.tb00946.x