Correlation between the strength and relaxation properties of polymers in the rubbery state

Zelenev, Yu. V.; Molotkov, A. P.; Loev, A. M.

doi:10.1007/bf00859643

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“…During the transition of a polymer from the glassy state to the rubbery state, molecular chains of the polymer become more mobile in response to the development of a cohesive, entangled network in the polymer. This contributes to structural compactness and therefore the development of high stiffness 42 . This result provides supplemental evidence for the large enhancement of the mechanical properties of VeroClear upon exposure to temperatures higher than 120 °C.…”

Section: Discussionmentioning

confidence: 99%

The mechanical and photoelastic properties of 3D printable stress-visualized materials

Xie

et al. 2017

Sci Rep

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Three-dimensional (3D) printing technology integrating frozen stress techniques has created a novel way to directly represent and characterize 3D interior discontinuities and the full-field stress induced by mining- or construction-related disturbances of deeply buried rock masses. However, concerns have been raised about the similitude between the mechanical behaviours of the printed model and its prototype rock mass. Ensuring the mechanical properties of the printable materials are as close as possible to those of real rock mass is of critical significance. In this work, a transparent, light, photosensitive polymer material was investigated for applications in frozen stress tests. The chemical composition of the material was determined by integrating the results of infrared spectroscopy (IR spectroscopy), X-ray diffraction (XRD), pyrolysis, gas chromatography and mass spectrometry (PY-GC/MS). Measures to improve the mechanical properties of the printable material, including printing orientation, post-processing, and temperature control, were evaluated by comparing the treated material with its prototype rock. The optical stress sensitivity of the material, including stress-visualized properties and stress-frozen performance, was also tested. This study offers an understanding of how printable materials should be modified to better simulate real rock masses, in terms of not only their geological geometry but also their mechanical performance.

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Section: Discussionmentioning

confidence: 99%

The mechanical and photoelastic properties of 3D printable stress-visualized materials

Xie

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

Correlation between the strength and relaxation properties of polymers in the rubbery state

Cited by 1 publication

References 1 publication

The mechanical and photoelastic properties of 3D printable stress-visualized materials

The mechanical and photoelastic properties of 3D printable stress-visualized materials

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