High-amplitude stress-wave propagation in an anisotropic quartz-phenolic composite

Berkowitz, Harvey M.; Cohen, Leslie J.

doi:10.2514/6.1971-179

Cited by 2 publications

(4 citation statements)

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“…The wave shapes observed in our tests are similar to those observed by Michaels [36] ] and Berkowitz and Cohen [27] in cloth-laminate quartz phenolic and by Lundergan [37] for a short duration pulses in plate laminates of stainless steel and epoxy. Similar wave front profiles were observed in carbon phenolics at low stress amplitudes by Whittier and Peck [38] for propagation parallel to the layers.…”

Section: Analysis and Discussion Of Resultssupporting

confidence: 87%

“…This correction would bring all calculations into excellent agreement with experiment, and is, we believe, verification of both the adequacy of the model and the numerical values selected for the model parameters from our experiments. Berkowitz and Cohen [27] tested two orientations, propagation at 0° and 90° to the laminates, of Astroquartz 581 quartz -SC1008 phenolic resin composites. These had densities of 1.676 and 1.718 g/cm3 , and weight per cent quartz of 46.4 and 49.7 for the 0° and 90° orientation, respectively.…”

Section: Stress Wave Profilesmentioning

confidence: 99%

“…Stress profiles in cloth-laminate, quartz phenolic similar to our material have been measured by Michaels [36] and Berkowitz and Cohen [27 ] . We made rate dependent model calculations simulating these experiments.…”

Section: Stress Wave Profilesmentioning

confidence: 99%

“…Several models of this type have been proposed. Among the approaches are the artificial viscosity method incorporating dispersion and attenuation behavior into finite difference schemes [25], and various analogies to wave propagation in porous materials [11,26] , to elastic-plastic models [27], wave guides [25,28,29] , and wave filters [30].…”

Section: Theorymentioning

confidence: 99%

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Stress Pulse Attenuation in Cloth-Laminate Quartz Phenolic

Reed¹,

Munson²

1972

Journal of Composite Materials

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Using flat plate impact techniques and quartz stress gages, a study of the propagation of short-duration stress pulses in a cloth-laminate quartz phenolic composite was made. Propagation characteristics, wave shape and peak stress attenuation, were measured for 14.5 and 7 kbar initial impact stresses and 0.1, 0.2, and 0.3 μsec initial pulse durations for propagation distances up to 52 times the impactor thickness. The experimental results showed marked dispersive spreading of the wave profiles and very strong attenuation of stress, but no evidence of elastic-plastic effects. The amount of attenuation was much greater than could be attributed to "normal" attenuation in homogeneous materials with a modulus equivalent to the composite modulus.Experimental results were compared to calculations based on a rate dependent analogy using a generalized Maxwell model. The instantaneous and equilibrium response of the model was defined solely in terms of bulk properties of the components of the composite; while a single relaxation time of 0.023 μsec was determined from experiment. Model predictions agreed extremely well with the measured profiles, giving ± 10% agreement to the measured half-amplitude wave velocities. Attenuation was predicted to better than 20% in stress, which is quite good. Quantitative agreement was found between calculations and the measured results of other investigations, as well.

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Section: Analysis and Discussion Of Resultssupporting

confidence: 87%

Section: Stress Wave Profilesmentioning

confidence: 99%

Section: Stress Wave Profilesmentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

See 2 more Smart Citations