Creep Mechanics

Betten, Josef

doi:10.1007/978-3-662-04971-6

Cited by 83 publications

(88 citation statements)

References 130 publications

(237 reference statements)

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“…Besides experimental observation, highly developed creep modeling can also be applied to PBT processed at different mold temperatures to develop comprehensive understanding of the creep deformation. In the past half-century, numerous creep models [11,[19][20][21] have been proposed and applied to describe the creep behavior of viscoelastic materials. Various materials of the same geometry may respond differently under identical external effects.…”

Section: Resultsmentioning

confidence: 99%

Effect of mold temperature on short and long-term mechanical properties of PBT

Banik¹

2008

Express Polym. Lett.

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Abstract. In this work, the effect of mold temperature variation on the short-term mechanical properties obtained from the tensile and Charpy impact tests, and the long-term mechanical properties obtained from dynamic mechanical loading and flexural creep of injection molded polybutylene terepthalate (PBT) are reported. It has been observed that the effect of changing the processing condition viz. mold temperature on the viscoelastic properties are more pronounced when their long-term behavior is tested. The tensile and impact properties showed only a negligible effect to the change in mold temperature. Further, analysis of the creep curves by applying a four-element Burger model presented a comprehensive understanding of their long-term viscoelastic behavior with respect to the change in mold temperature.

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Section: Resultsmentioning

confidence: 99%

Effect of mold temperature on short and long-term mechanical properties of PBT

Banik¹

2008

Express Polym. Lett.

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“…Till now, numerous constitutive models have been presented to address viscoplastic, plasticity and the creep behaviors of materials [89][90][91][92][93][94][95][96][97][98][99][100][101][102][103][104][105][106][107]. Also, the time-dependent creep deformation of a metallic component under applied stress and temperature was studied by many researchers [92,99,104,105].…”

Section: Creep 200mentioning

confidence: 99%

Review on Creep Analysis and Solved Problems

Monfared¹

2018

Creep

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This chapter presents a useful literature reviews and applied solved problems that focus on the creep phenomenon and behavior of it in the solids. Various insights and available studies are reviewed and investigated regarding the creep behavior analysis in three categories such as analytical, numerical and experimental methods. In addition, novel and recent findings are presented in this chapter such as predicting and obtaining the viscosity of the solids at high temperatures using steady state creep phenomenon (i.e., introducing a simulation and analogy between creeping solids and viscous fluids).

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“…The EVCP protocol [16] for rigorously establishing Eqs. (23) to (25) is to first derive the pertinent viscoelastic governing relations and their generalized constitutive relations and solutions in the time space and then take their FT and compare these transforms to the FTs of the corresponding elastic solutions.…”

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confidence: 99%

Elastic and Viscoelastic Poisson’s Ratios: The Theoretical Mechanics Perspective

Hilton¹

2017

MSA

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A recent review publication presented an extensive and comprehensive assessment of the phenomenological relations of Poisson's ratios (PRs) to the behavior and responses of contemporary materials under specific loading conditions. The present review and analysis paper is intended as a theoretical mechanics complement covering mathematical and physical modeling of a single original elastic and of six time and process (i.e. path and stress) dependent viscoelastic PR definitions as well as a seventh special path independent one. The implications and consequences of such models on material characterization are analyzed and summarized. Indeed, PRs based on experimentally obtained 2-D strains under distinct creep and/or relaxation processes exhibit radically different time responses for identical material specimen. These results confirm the PR's implicit path dependence in addition to their separate intrinsic time reliance. Such non-uniqueness of viscoelastic PRs renders them unsuitable as universal material descriptors. Analytical formulations and experimental measurements also examine the physical impossibility of instantaneously achieving time independent loads or strains or their rates thus making certain PR definitions based on constant state variables, while mathematically valid, physically unrealistic and unachievable. A newly developed theoretical/experimental protocol for the determination of the time when loading patterns reach stead-state conditions based on strain accelerations demonstrates the capability to measure this time from experimental data. Due to the process dependent PRs, i.e. stress and stress history paths, the non-existence of a unique viscoelastic PR and of a universal elastic-viscoelastic correspondence principle or analogy (EVCP) in terms of PRs is demonstrated. Additionally and independently, the required double convolution integral construction of linear viscoelastic constitutive relations with the inclusion of PRs is cumbersome analytically and computationally needlessly highly CPU intensive. Furthermore, there is no theoretical fundamental hint as to what loading path is required to produce a unique universal viscoelastic PR definition necessary for formulating a PR based constitutive relation or an EVCP protocol. The analysis associated with an additional Class VII viscoelastic PR establishes it as a universal representation which is loading path and strain independent while still remaining time dependent. This Class PR can be the one used if it is desired to express constitutive relations in terms of PRs, subject to the caveat applying to all PR Classes regarding the CPU intensiveness in the time space due to triple product and double convolution integral constitutive relations. However, the use PRs is unnecessary since any set of material behavior can be uniquely and completely defined in terms of only moduli and/or compliances. The mathematical model of instantaneous initial loading paths, based on Heaviside functions, is examined in detail and shown to lead to infinite vel...

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Creep Mechanics

Cited by 83 publications

References 130 publications

Effect of mold temperature on short and long-term mechanical properties of PBT

Effect of mold temperature on short and long-term mechanical properties of PBT

Review on Creep Analysis and Solved Problems

Elastic and Viscoelastic Poisson’s Ratios: The Theoretical Mechanics Perspective

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