Photoelastic study on the effect of flow induced residual stresses on fracture parameters

Reddy, M. Subramanyam; Ramesh, K.

doi:10.1016/j.tafmec.2016.04.003

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…However, metals and plastics differ greatly in their structure and properties, so some adaptations were necessary to introduce them 22 . Destructive (layer‐removal, 23 hole drilling, 24 stress whitening 9 ) and nondestructive (X‐ray diffraction [XRD], 25 indentation, 26 time‐resolved fluorescence, 27 photoelastic, 28 etc.) methods have been developed 1,4 .…”

Section: Introductionmentioning

confidence: 99%

Determination of residual stresses in amorphous thermoplastic polymers by DMA

Vesel

Kusić

Pulko

et al. 2022

J of Applied Polymer Sci

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The processing of polymers and polymeric materials always leaves some residual stresses in the final product, which can have a positive but usually a negative effect on the properties of the final product. Polycarbonate was injection molded into the mold, which was heated to 50, 60, or 70°C to produce test specimens with different amounts of residual stresses. They were then annealed at various temperatures below Tg to partially remove the stresses or heated to 145°C (above Tg) to completely remove them. Comparison between annealed and as‐molded samples showed a strong influence of residual stresses on mechanical properties. Dynamic mechanical analysis (DMA) analysis showed that the loss modulus can be divided into the intrinsic loss modulus, which is a material property, and the residual stress, which can be relaxed at a given temperature. The stress relaxation curve, obtained by subtracting the loss modulus of the annealed sample from the loss modulus of the as‐molded sample gives us the ability to estimate the residual stresses that have been or can still be relaxed by heating to a given temperature.

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Section: Introductionmentioning

confidence: 99%

Determination of residual stresses in amorphous thermoplastic polymers by DMA

Vesel

Kusić

Pulko

et al. 2022

J of Applied Polymer Sci

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“…The oriented structure plays an important role in viscoelasticity of polymers. [3][4][5][6][7][8][9][10] Miranda et al 7 explored the influence of orientation induced by uniaxial drawing on the crystalline structure and relaxation of poly(ethylene tetrafluoroethylene). van Berkel et al 8 investigated the interplay between the level of orientation and the relaxation processes occurring in poly(ethylene 2,5-furandicarboxylate) and poly(ethylene terephthalate) (PET).…”

Section: Introductionmentioning

confidence: 99%

“…To achieve cracking resistance performance improvement, a critical issue is managing the viscoelasticity of PC. The oriented structure plays an important role in viscoelasticity of polymers . Miranda et al .…”

Section: Introductionmentioning

confidence: 99%

Dynamic viscoelasticity and molecular orientation in uniaxially drawn PC/PET blends

Luo

Liu

et al. 2019

J of Applied Polymer Sci

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The dependence of dynamic viscoelasticity on molecular orientation of the hot-drawn polycarbonate (PC)/poly(ethylene terephthalate) blends was studied experimentally. The oriented states of samples were investigated by wide-angle X-ray diffraction and quantified by Hermans' factor. The viscoelasticity was probed by dynamic mechanical analysis. For the fitting curves of dynamic modulus versus orientation, the PC-rich blends with different compositions had an opposite concavity and convexity compared with the neat PC. The difference revealed the influence of molecular mobility on orientation and viscoelasticity. The assumption on the phase morphological change from sea-island to local sandwich-like structure in blends was proposed and used to interpret the variation of slope of fitting curves. The relationship between orientation and viscoelasticity was observed in PC-rich blends, which can help understand the mechanism of molecular orientation and develop the constitutive relations for simulation.

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Digital photoelasticity: Recent developments and diverse applications

Ramesh

Sasikumar

2020

Optics and Lasers in Engineering

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Photoelastic study on the effect of flow induced residual stresses on fracture parameters

Cited by 6 publications

References 12 publications

Determination of residual stresses in amorphous thermoplastic polymers by DMA

Determination of residual stresses in amorphous thermoplastic polymers by DMA

Dynamic viscoelasticity and molecular orientation in uniaxially drawn PC/PET blends

Digital photoelasticity: Recent developments and diverse applications

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