Novel temperature measurement method &amp; thermodynamic investigations of amorphous polymers during high rate deformation

Kendall, J.‐M.; Froud, Richard F.; Siviour, Clive R.

doi:10.1016/j.polymer.2014.03.058

Cited by 19 publications

(8 citation statements)

References 15 publications

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“…150 μs) causing thermal strain softening of the specimen. This increase in strain softening with increasing rate of deformation has also been seen in PMMA by Arruda et al [27] and is investigated in more detail for the PPVC-2 material in Kendall et al [28]. The increased strain softening of PPVC-2 relative to PVC is expected to be due to the larger rate and temperature dependence of the flow stress of PPVC-2, so that the effect of adiabatic heating is larger.…”

Section: Results and Discussion (A) Uniaxial Compressionmentioning

confidence: 53%

“…The importance of adiabatic heating in high-rate response is also seen when comparing the low-temperature quasi-static data, showing significant strain hardening at higher strains, to high-rate room temperature data, in which this is not observed. Research by Kendall et al [28] shows that the removal of strain hardening at higher rates can be fully explained by adiabatic heating effects. Finally, it is instructive to compare the stress-strain curves for PPVC-2 to PVC.…”

Section: Results and Discussion (A) Uniaxial Compressionmentioning

confidence: 99%

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Rate dependence of poly(vinyl chloride), the effects of plasticizer and time–temperature superposition

Kendall

Siviour

2014

Proc. R. Soc. A.

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Four different poly(vinyl chloride) (PVC) materials varying in plasticizer content were studied in a combined experimental and analytical investigation including uniaxial compression tests at strain rates ranging from 10 −3 to 10 4 s −1 at room temperature, and temperatures ranging from −115 to 100 • C at a rate of 10 −2 s −1 . Additional tests using a dynamic mechanical and thermal analyser were conducted on each PVC material to give a more detailed analysis of temperature and rate dependence. Adjusting the plasticizer content allows the temperature at which transitions, specifically the α-transition, or 'glass transition', and β-transition, occur to be moved in order to better examine the interplay of temperature and strain rate dependence. This program of research is then extended to time-temperature superposition where a novel application and interpretation of an established superposition method is presented.

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Section: Results and Discussion (A) Uniaxial Compressionmentioning

confidence: 53%

Section: Results and Discussion (A) Uniaxial Compressionmentioning

confidence: 99%

Rate dependence of poly(vinyl chloride), the effects of plasticizer and time–temperature superposition

Kendall

Siviour

2014

Proc. R. Soc. A.

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“…At higher strains, resistance to polymer chain alignment causes strain hardening in the material [96]. However, with increasing strain rate, this strain hardening effect is balanced by adiabatic heating in the material, which ultimately dominates over the hardening from resistance to polymer chain alignment [94,96,124,130,137,142]. Finally, in the case of PMMA (Fig.…”

Section: Glassy Amorphous Polymersmentioning

confidence: 99%

“…Adding to the difficulty of understanding adiabatic heating under dynamic loading is the lack of high speed thermal techniques. Only recently have thermal cameras with sufficient acquisition times become available [142,[187][188][189].…”

Section: Time-temperature Superposition For Large Strain Response Of mentioning

confidence: 99%

High Strain Rate Mechanics of Polymers: A Review

Siviour

Jordan

2016

J. dynamic behavior mater.

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273

121

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The mechanical properties of polymers are becoming increasingly important as they are used in structural applications, both on their own and as matrix materials for composites. It has long been known that these mechanical properties are dependent on strain rate, temperature, and pressure. In this paper, the methods for dynamic loading of polymers will be briefly reviewed. The high strain rate mechanical properties of several classes of polymers, i.e. glassy and rubbery amorphous polymers and semi-crystalline polymers will be reviewed. Additionally, time-temperature superposition for rate dependent large strain properties and pressure dependence in polymers will be discussed. Constitutive modeling and shock properties of polymers will not be discussed in this review.

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“…Rabin and Rittel [22] developed a technical analysis of the time response of solid embedded thermocouples and Rittel [23] used the embedded thermocouple technique to investigate the temperature rises of polycarbonate at high strain rates. Michael et al [24] used a thermocouple method to measure the temperature rise that occurs in the center of specimens undergoing high deformation. If considering the contact technique, it should be noted that it can be intrusive when inserting the thermocouple at the heart of the specimen [25][26], and using this technique, no information regarding damage evolution can be obtained.…”

Section: Temperature Measurements Of Specimens During a Tensile Shb Hmentioning

confidence: 99%

Damage detection versus heat dissipation in E-glass/Epoxy laminated composites under dynamic compression at high strain rate

Tarfaoui

Moumen

Yahia

2018

Composite Structures

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International audienceIn this investigation, a new experimental technique in which the deformation, damage mode, and the temperature are measured simultaneously during a high strain rate on laminated composites materials. The composites consist of unidirectional E-glass fibers reinforced epoxy polymer composites used in industrial applications. The experimental setup consists of a compression Split Hopkinson Pressure Bar (SHPB), a high-speed infrared camera and a high-speed Fastcam rapid camera. Specimens, with cubic like a shape, are impacted at different strain rates ranging from 200 to 2000 s(-1). During impact test, the specimen surface is controlled and monitored with the infrared camera which provides thermal images in time sequence and with high-speed camera which acquires the damage progressive in specimens. Experimental results show that the damage throughout specimens differs and the temperature change depending on the damage mode and their maximum exceed 219 degrees C

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Novel temperature measurement method & thermodynamic investigations of amorphous polymers during high rate deformation

Cited by 19 publications

References 15 publications

Rate dependence of poly(vinyl chloride), the effects of plasticizer and time–temperature superposition

Rate dependence of poly(vinyl chloride), the effects of plasticizer and time–temperature superposition

High Strain Rate Mechanics of Polymers: A Review

Damage detection versus heat dissipation in E-glass/Epoxy laminated composites under dynamic compression at high strain rate

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