Mechanical responses of Semi-crystalline thermoplastic polymers at various temperatures

Song, Ruyue; Berer, Michael; Muliana, Anastasia

doi:10.1016/j.ijsolstr.2021.111398

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…One can also note from Fig. 2 b that the possible degradation induced by injection process does not significantly affect neither the Young's modulus nor the yield stress (NB: consistently with other recent examples illustrating the effect of crystallinity on PBT storage [16] or modulus average molar mass and crystalline ratio on POM yield stress [17] ).…”

Section: Mechanical Testssupporting

confidence: 87%

Embrittlement of polybutylene terephthalate induced by injection molding

Loyer

Ferreira

Marijon

et al. 2022

Polymer Degradation and Stability

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Section: Mechanical Testssupporting

confidence: 87%

Embrittlement of polybutylene terephthalate induced by injection molding

Loyer

Ferreira

Marijon

et al. 2022

Polymer Degradation and Stability

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“…Due to the generally low thermal conductivity (K) of polymers, this thermal energy is stored in a structure. Since the stored thermal energy is accumulated, it provokes the heating of a structure and consequently the decrease in its mechanical performance causing irreversible changes in a material at the final stages of degradation [4]. The structural changes in a material influenced by the self-heating are caused by the increase in the activity of polymer chains with the increase in temperature, which, in consequence, results in material softening and, in ultimate cases, in the breaking of polymer chains.…”

Section: The Self-heating Effectmentioning

confidence: 99%

Recent Advances in Limiting Fatigue Damage Accumulation Induced by Self-Heating in Polymer–Matrix Composites

Amraei

Katunin

2022

Polymers

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The self-heating effect can be considered as a catastrophic phenomenon that occurs in polymers and polymer–matrix composites (PMCs) subjected to fatigue loading or vibrations. This phenomenon appears in the form of temperature growth in such structures due to their relatively low thermal conductivities. The appearance of thermal stress resulting from temperature growth and the coefficient of thermal expansion (CTE) mismatch between fibers and neighboring polymer matrix initiates and/or accelerates structural degradation and consequently provokes sudden fatigue failure in the structures. Therefore, it is of primary significance for a number of practical applications to first characterize the degradation mechanism at the nano-, micro- and macroscales caused by the self-heating phenomenon and then minimize it through the implementation of numerous approaches. One viable solution is to cool the surfaces of considered structures using various cooling scenarios, such as environmental and operational factors, linked with convection, contributing to enhancing heat removal through convection. Furthermore, if materials are appropriately selected regarding their thermomechanical properties involving thermal conductivity, structural degradation may be prevented or at least minimized. This article presents a benchmarking survey of the conducted research studies associated with the fatigue performance of cyclically loaded PMC structures and an analysis of possible solutions to avoid structural degradation caused by the self-heating effect.

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Experimental and theoretical study of stress relaxation in high-density polyethylene

Kroon,

Görtz,

Islam

et al. 2024

Acta Mech

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Stress relaxation of high-density polyethylene is addressed both experimentally and theoretically. Two types of stress relaxation testing are carried out: uniaxial tensile testing at constant test specimen length and compression testing of a 3D structure producing inhomogeneous deformation fields and relaxation. A constitutive model for isotropic, semi-crystalline polymers is also proposed. The model has the ability to model stress relaxation at different time scales. The developed model was implemented as a user subroutine in Abaqus (UMAT). The implicit integration scheme including an algorithmic tangent modulus is described in detail. The material model is calibrated by use of the uniaxial tensile tests, and the model is then validated by simulating the compression tests of the 3D structure. The model is able to describe the uniaxial tension tests well, and the comparison between the simulations and experimental testing of the 3D structure shows very good agreement.

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Mechanical responses of Semi-crystalline thermoplastic polymers at various temperatures

Cited by 5 publications

References 31 publications

Embrittlement of polybutylene terephthalate induced by injection molding

Embrittlement of polybutylene terephthalate induced by injection molding

Recent Advances in Limiting Fatigue Damage Accumulation Induced by Self-Heating in Polymer–Matrix Composites

Experimental and theoretical study of stress relaxation in high-density polyethylene

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