Thermomechanical response studies of solid propellants subjected to cyclic and random loading.

Schapery, R. A.; Cantey, Dalton

doi:10.2514/3.3426

Cited by 24 publications

(3 citation statements)

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“…Tormey and Britton showed that vibration tends to soften or degrade the propellant mechanically, but that some of the degradation disappears during periods of rest. This point was also made by Schapery and Cantey in 1966 [12], who published a theoretical framework of the vibrational self-heating of solid propellants. While their analysis was primarily limited to dissipative viscoelastic heating, they noted that for cyclic loading, "it was necessary to account for degradation and to use a corrected loss tangent".…”

Section: Early Literature On Vibrational Heating Of Energeticsmentioning

confidence: 66%

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Vibration-Induced Heating of Energetic Materials: A Review

Perry

Walley

2021

J. dynamic behavior mater.

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The transport of energetic materials—whether by truck over rough terrain, or attached to the undercarriage of a high-performance jet aircraft—carries a certain level of inherent risk as the repeatedly applied stresses from vibration may lead to heating, mechanical degradation, and potentially even the triggering of an ignition event. Increasing knowledge of the underlying physics which control ignition is allowing us to better understand, and thus reduce, the risk of a catastrophic event occurring. The Apollo and Space Shuttle programmes provided motivation for research into the topic in the 1960s and 1970s, and some recent studies have focussed on the grain-scale physics of ignition. However, much of the useful insight has arisen from work with other primary applications in mind. Therefore, this review aims to bring together literature from several fields, with the intention of better understanding vibration-induced heating (VIH) phenomena in energetic materials. Sensitivity, VIH in viscoelastic polymers and inert composites, and a technique known as vibrothermography which uses VIH to detect cracks, are all considered where relevant read-across can be found. Often being viscoelastic materials and composites with complex rheology, energetic materials subjected to vibrational loading tend to warm up, with potential for even greater temperature rises due to anisotropy-driven localised heating mechanisms. Binders soften as temperature rises, and the chance of damage increases, which may lead to runaway heating and thermal failure (if mechanical failure does not occur first).

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Section: Early Literature On Vibrational Heating Of Energeticsmentioning

confidence: 66%

“…1 Schematic diagram of a constant shear-strain amplitude test device. From [12] by vibrational loading might affect the conditions required for ignition to occur.…”

Section: Sensitivity Of Energeticsmentioning

confidence: 99%

Vibration-Induced Heating of Energetic Materials: A Review

Perry

Walley

2021

J. dynamic behavior mater.

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“…Due to its practical importance, numerous researchers were focused on the development of empirical fracture models of polymeric elements that were subjected to self-heating, in order to describe the phenomenology, and to predict this process. Such models were presented, in particular, in the studies of Tormey [54], as well as in numerous studies of Schapery (see e.g., [56,57]).…”

Section: Literature Review On the Self-heating Effectmentioning

confidence: 99%

Criticality of the Self-Heating Effect in Polymers and Polymer Matrix Composites during Fatigue, and Their Application in Non-Destructive Testing

Katunin

2018

Polymers

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The self-heating effect is a dangerous phenomenon that occurs in polymers and polymer matrix composites during their cyclic loading, and may significantly influence structural degradation and durability as a consequence. Therefore, an analysis of its criticality is highly demanding, due to the wide occurrence of this effect, both in laboratory fatigue tests, as well as in engineering practice. In order to overcome the problem of the accelerated degradation of polymer matrix structures, it is essential to evaluate the characteristic temperature values of self-heating, which are critical from the point of view of the fatigue life of these structures, i.e., the temperature at which damage initiates, and the safe temperature range in which these structures can be safely maintained. The experimental studies performed were focused on the determination of the critical self-heating temperature, using various approaches and measurement techniques. This paper present an overview of the research studies performed in the field of structural degradation, due to self-heating, and summarizes the studies performed on the evaluation of the criticality of the self-heating effect. Moreover, the non-destructive testing method, which uses the self-heating effect as a thermal excitation source, is discussed, and the non-destructivity of this method is confirmed by experimental results.

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