High Temperature Nanoindentation of PMR-15 Polyimide

Yang, Lih-Mei; Jones, David F.; Tandon, G. P.; Putthanarat, S.; Schoeppner, G. A.

doi:10.1007/s11340-009-9254-5

Cited by 29 publications

(11 citation statements)

References 26 publications

(61 reference statements)

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“…As polymers are exposed to higher hydrostatic pressure under nanoindentation (compared to tensile test), the elastic modulus of polymers obtained from nanoindentation is argued to be likely higher than the one obtained from tensile test particularly at high temperatures in (Seltzer et al, 2001). However, the indentation and tensile elastic moduli of polyimide were found to agree well with each other at different temperatures ranging from 20 to 200 o C (Lu et al, 2010).…”

Section: Non-local Clausius-duhem Inequalitymentioning

confidence: 72%

On couple-stress elasto-plastic constitutive frameworks for glassy polymers

Alisafaei

Han

Garg

2016

International Journal of Plasticity

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Various experimental studies have revealed length scale dependent deformation of different materials at micron and sub-micron length scales. In metals, such length scale dependent deformations are considered to be associated with geometrically necessary dislocations arising from an increase in strain gradients related to non-uniform plastic deformation. Recent experiments, however, have shown that the nature of length scale dependent deformation in polymers is quite different from metals as in polymers size effects have been observed in pure elastic as well as in elasto-plastic deformation. It is shown in this study that similar to metals, size effects in polymers can be associated with an increase in higher order displacement gradients with decreasing length scale. However, the experimental results discussed here reveals that, in contrast to metals, these higher order displacement gradients are mainly of elastic nature even when glassy polymers deform elasto-plastically. Taking the effects of these elastic higher order displacement gradients into account, a couple-stress theory is developed to predict size effect in glassy polymers with elasto-plastic deformation.

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Section: Non-local Clausius-duhem Inequalitymentioning

confidence: 72%

On couple-stress elasto-plastic constitutive frameworks for glassy polymers

Alisafaei

Han

Garg

2016

International Journal of Plasticity

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“…With the increase of indentation depth, the deformation in a material can change from purely elastic to elastic‐plastic. The “held‐at‐the‐peak” method was used for the indentation experiment, which is a technique used for testing polymer and soft materials 20–23. In this method, the indenter was held at the maximum load for a length of time prior to unloading.…”

Section: Methodsmentioning

confidence: 99%

Thermomechanical and shape memory properties of thermosetting shape memory polymer under compressive loadings

Fulcher

Karaca

Tandon

et al. 2012

J of Applied Polymer Sci

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Shape memory polymers (SMPs) are an emerging class of active polymers that may be used for a range of reconfigurable structures. In this study, the thermomechanical and shape memory behavior of a thermosetting SMP was investigated using large‐scale compressive tests and small‐scale indentation tests. Results show that the SMP exhibits different deformation modes and mechanical properties in compression than in tension. In glassy state, the SMP displays significant plastic deformation and has a much higher modulus and yield strength in comparison to those obtained in tension. In rubbery state, the SMP behaves like a hyperelastic material and again has a much higher modulus than that obtained in tension. The SMPs were further conditioned separately in simulated service environments relevant to Air Force missions, namely, (1) exposure to UV radiation, (2) immersion in jet‐oil, and (3) immersion in water. The thermomechanical and shape recovery properties of the original and conditioned SMPs were examined under compression. Results show that all the conditioned SMPs exhibit a decrease in Tg as compared to the original SMP. Environmental conditionings generally result in higher moduli and yield strength of the SMPs in the glassy state but lower modulus in the rubbery state. In particular, the UV exposure and water immersion, also weaken the shape recovery abilities of the SMPs. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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“…These non-ambient temperature nanoindentation instruments/techniques have been successfully utilized to characterize the mechanical properties of polymers, metals and hard coatings (Beake and Smith 2002;Everitt et al 2011;Fox-Rabinovich et al 2006;Beake 2007, Gray et al 2009;Lu et al 2010;Sawant and Tin 2008;Schuh et al 2005;Xia et al 2003;Ye et al 2005). Encouragingly, it has been found that the properties at measured at non-ambient temperature can reflect their performance at real in-service conditions.…”

Section: Influence Of Temperaturementioning

confidence: 99%

“…An aerospace polymer resin, PMR-15 polyimide, was investigated by Lu et al (2010) using a MTS nanoindenter up to 200 °C. An aerospace polymer resin, PMR-15 polyimide, was investigated by Lu et al (2010) using a MTS nanoindenter up to 200 °C.…”

Section: Influence Of Temperaturementioning

confidence: 99%

Nanomechanical Analysis of High Performance Materials

Tiwari¹

2014

Solid Mechanics and Its Applications

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The fundamental questions arising in mechanics are: Why?, How?, and How much? The aim of this series is to provide lucid accounts written by authoritative researchers giving vision and insight in answering these questions on the subject of mechanics as it relates to solids.The scope of the series covers the entire spectrum of solid mechanics. Thus it includes the foundation of mechanics; variational formulations; computational mechanics; statics, kinematics and dynamics of rigid and elastic bodies: vibrations of solids and structures; dynamical systems and chaos; the theories of elasticity, plasticity and viscoelasticity; composite materials; rods, beams, shells and membranes; structural control and stability; soils, rocks and geomechanics; fracture; tribology; experimental mechanics; biomechanics and machine design.The median level of presentation is the first year graduate student. Some texts are monographs defining the current state of the field; others are accessible to final year undergraduates; but essentially the emphasis is on readability and clarity.

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High Temperature Nanoindentation of PMR-15 Polyimide

Cited by 29 publications

References 26 publications

On couple-stress elasto-plastic constitutive frameworks for glassy polymers

On couple-stress elasto-plastic constitutive frameworks for glassy polymers

Thermomechanical and shape memory properties of thermosetting shape memory polymer under compressive loadings

Nanomechanical Analysis of High Performance Materials

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