Journal ArticleDOI
Elastic Stress Waves in Layered Composite Materials
Joseph L. Rose,Pei Chi Chou +1 more
TLDR
In this article, a photoelastic method is used for the study of wave propagation in composite materials and the results show that the wave front is approaching a steady state and propagating with unchanging wave shape.Abstract:
In [1], a theory is proposed by Chou and Wang for the calculation of elastic wave front speeds in unidirectional composite materials. A basic assumption employed in the theory states that after a brief initial transient period, the wave front attains a steady state and propagates with unchanging wave shape. The purpose of this paper is to present a preliminary experimental justification of this assumption. Although the results are not conclusive, they do show that the wave front is approaching a steady state. This paper also demonstrates that the photoelastic method is suitable for the study of wave propagation in composite materials. High speed photography and dynamic photoelasticity are used for testing a photoelastic composite model. The test specimen, shown in Figure 1, consists of two bonded plastic reference plates of PSM-IB* and S-16°°, mounted opposite toread more
Citations
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Dissertation
An embedded fibre optic sensor for impact damage detection in composite materials
TL;DR: In this paper, a structura!ly embedded fiber op tic damage detection sensor for composite materials is described, which is designed specifically for the detection of barely visible damage resulting from low velocity impacts in Kevlar-epoxy laminates.
Journal ArticleDOI
An electromagnetic, plane stress-wave generator
TL;DR: In this paper, a dynamic polariscope was used to photographically stop the movement of the photoelastic-fringe patterns caused by the stress wave, and the results indicated that the scatter from duplicate shots performed with this technique is on the order of 3 percent.
Journal ArticleDOI
On the use of photoelastic composite models - Two approaches for the derivation of material constants for plane-stress layered photoelastic composite materials are presented. Photoelastic models are used to test basic assumptions in the theory and to evaluate experimental equivalent moduli in tension and in shear
TL;DR: In this article, two approaches for the derivation of material constants for plane-stress layered composite materials are presented, and the theoretical and experimental equivalent moduli for test specimens loaded in tension and in shear are also compared.
References
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Journal ArticleDOI
Frequency as a Parameter in Delamination Problems--A Preliminary Investigation
TL;DR: In this article, it is proposed that the natural frequency may be a parameter to reflect the unbonding or weakening of the composite, and the principal aim is to construct a model which nearly corresponds to the actual behavior.
Journal ArticleDOI
A comparison of static and dynamic properties of photoelastic materials
A. B. J. Clark,Robert J. Sanford +1 more
TL;DR: In this paper, the dynamic values of the modulus of elasticity and photoelastic fringe constant of Homalite 100 and ten epoxy resins were determined, and it was found that five materials exhibited desirable dynamic properties including two materials which exhibited no appreciable change in fringe constant.
Journal ArticleDOI
Control Volume Analysis of Elastic Wave Front in Composite Materials
Pei Chi Chou,A.S.D. Wang +1 more
TL;DR: In this paper, a theory for the analysis of an elastic wave front in unidirectionally laminated as well as fiber reinforced composite mate rials was proposed, which is based on the concept of control volume.
Journal ArticleDOI
Study of cylindrical stress waves generated by exploding wires
Joseph L. Rose,Pei Chi Chou +1 more
TL;DR: In this article, an experimental technique utilizing high pressure gas from an exploding wire is used to load long, hollow, thick-walled cylinders from the inside, resulting in plane-strain cylindrical stress waves are one-dimensional in nature.