Showing papers by "William H. Prosser published in 1990"
TL;DR: In this paper, the normalized change in ultrasonic "natural" velocity as a function of stress and temperature was measured in a unidirectional laminate of T300/5208 graphite/epoxy composite using a pulsed phase locked loop ultrasonic interferometer.
Abstract: The normalized change in ultrasonic "natural" velocity as a function of stress and temperature was measured in a unidirectional laminate of T300/5208 graphite/epoxy composite using a pulsed phase locked loop ultrasonic interferometer. These measurements were used together with the linear (second order) elastic moduli to calculate some of the nonlinear (third order) moduli of this material.
32 citations
01 Jan 1990
TL;DR: One effect of nonlinear elasticity on elastic wave propagation is that the velocity of the elastic wave is a function of the applied stress on the material as mentioned in this paper, which is also important in attempts to non-destructively characterize residual and applied stress in materials.
Abstract: One effect of nonlinear elasticity on elastic wave propagation is that the velocity of the elastic wave is a function of the applied stress on the material. This effect has been used to characterize the nonlinear elastic properties of numerous materials and is also important in attempts to nondestructively characterize residual and applied stress in materials. In addition, investigations have established a possible correlation between the nonlinear elastic properties and ultimate strength in conventional materials such as aluminum [1] and carbon steel [2].
8 citations
04 Dec 1990
TL;DR: In this paper, the effect of stress on flux deviation for unidirectional T300/5208 was modeled using previously measured elastic coefficients. And the results predicted a shift as large as three degrees for the quasi-transverse wave, which offers a new nondestructive technique for evaluating stress in composites.
Abstract: Ultrasonic waves suffer energy flux deviation in graphite/epoxy because of the large anisotropy. The angle of deviation is a function of the elastic coefficients. For nonlinear solids, these coefficients and thus the angle of deviation is a function of stress. Acoustoelastic theory was used to model the effect of stress on flux deviation for unidirectional T300/5208 using previously measured elastic coefficients. Computations were made for uniaxial stress along the chi /sub 3/ axis (fiber axis) and the chi /sub 1/ axis for waves propagating in the chi /sub 1/ chi /sub 3/ plane. These results predict a shift as large as three degrees for the quasi-transverse wave. It is noted that the shift in energy flux offers a new nondestructive technique for evaluating stress in composites. >
6 citations
01 Jan 1990
TL;DR: In this article, the effect of stress on flux deviation for unidirectional T300/5208 using previously measured elastic coefficients is modeled as a function of the elastic coefficients.
Abstract: Ultrasonic waves suffer energy flux deviation in graphite/epoxy because of the large anisotropy. The angle of deviation is a function of the elastic coefficients. For nonlinear solids, these coefficients and thus the angle of deviation is a function of stress. Acoustoelastic theory was used to model the effect of stress on flux deviation for unidirectional T300/5208 using previously measured elastic coefficients. Computations were made for uniaxial stress along the x3 axis fiber axis) and the x1 axis for waves propagating in the x1x3 plane. These results predict a shift as large as three degrees for the quasi-transverse wave. The shift in energy flux offers new nondestructive technique of evaluating stress in composites.