Viscoelastic behavior of PMMA in relation to deformation mode

Ionita, Daniela; Cristea, Mariana; Banabic, Dorel

doi:10.1007/s10973-015-4558-4

Cited by 24 publications

(14 citation statements)

References 39 publications

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“…+100 • C and characterizes the relaxation transition (glass transition). Beta-relaxations due to local mobility of side groups are observed in the region between 25 to 30 • C and confirm the findings in (Ionita et al 2015;Menard and Menard 2020).…”

Section: Discussionsupporting

confidence: 87%

Experimental investigations and numerical simulations of innovative lightweight glass–plastic-composite panels made of thin glass and PMMA

Hänig

Weller

2021

Glass Struct Eng

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Composites are being increasingly used for industrial applications and combine the advantageous properties of two or more constituents. The urge to reduce material to a minimum and the trend towards lightweight glass structures require further developments in high performance and fully transparent composite structures for the building industry. Novel innovative glass–plastic-composite panels combining a lightweight polymer polymethylmethacrylate (PMMA) interlayer core and cover layers of thin glass are currently under development. The panels exhibit high structural load-bearing performance, are durable and fully transparent with a low self-weight. These properties make the composite panels suitable for slender and lightweight glass constructions and reveal new design possibilities for the building industry. However, the material properties of the modified PMMA polymer interlayer core for precise design considerations are lacking. Furthermore, the material behaviour of thermoplastic polymers changes over time, ages due to environmental influences and is temperature-dependent. This significantly affects the composite load-bearing behaviour and defines the limits of application for the composite panels in the building industry. In order to facilitate during the development process and to build a design basis for the composite panels, material model parameters and simulation methods are required. Hence, an extensive test programme was conducted to investigate the material properties of the PMMA interlayer core by means of dynamic mechanical thermal analysis as well as uniaxial tensile and creep tests. The dataset and subsequent implementation into finite element software allowed for realistic simulations of the glass–plastic-composite panels and an extension of experimental results. Numerical simulations were performed with the commercial finite element programme ANSYS Workbench 19.3. Additionally, four-point bending tests were performed on composite test specimens with a different build-up and conventional glass panels to validate the material model and finite element simulations. These investigations and adopted material properties formed the basis for a numerical parametric study to evaluate the influence of stiffness, the load-bearing and lightweight performance in different build-ups. All the results are evaluated in detail and discussed in comparison with conventional monolithic and laminated glass panels. The dataset and material model parameters can be applied to further developments and design of lightweight glass–plastic-composite panels for structural applications in the building industry.

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Section: Discussionsupporting

confidence: 87%

Experimental investigations and numerical simulations of innovative lightweight glass–plastic-composite panels made of thin glass and PMMA

Hänig

Weller

2021

Glass Struct Eng

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“…With the presented modified 3PBTs, a novel test setup was proposed to determine quasi-static material behavior of a material using DIC measurements in a 3PBT setup. Within the test, stress relaxation, creep and a hysteresis loop during loading and unloading were observed which clearly indicate a viscoelastic-viscoplastic material behavior of the investigated PMMA [31][32][33] .…”

Section: Discussionmentioning

confidence: 99%

Is the assumption of linear elasticity within prosthodontics valid for polymers? —An exemplary study of possible problems

et al. 2021

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As shown in previous studies within other scientific fields, the material behavior of polymethyl methacrylate (PMMA) is viscoelasticviscoplastic. However, in dental biomaterial science it is mostly considered as linear elastic or elastic-plastic. The aim of the present study was to evaluate, whether the assumption of elastic or elastic-plastic material behavior for PMMA is a practicable simplification or a potential source of error, especially considering clinical loading conditions. Telio-CAD was tested in three-point bending tests with different test velocities to examine the material behavior at different initial loading rates. Additionally, a dynamic-mechanicalthermal-analysis at different frequencies and temperatures was used. Here, a significant influence of loading rate and temperature as well as stress relaxation and creep were observed. To describe the rate-dependency of the elastic modulus, a new model was created, from which the elastic modulus can be calculated with a given strain rate. This model was validated using linear elastic finite element analysis.

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“…The transitions are named α, β, and γ in temperature descending order. The γ‐relaxation can be ascribed to the motion of α‐methyl groups bonded to the main chain whereas the β‐relaxation can be associated with the side motion (rotation) and/or interaction of pendant groups . In the literature the γ‐relaxation was attributed to local twisting motions of ethylene glycol moieties and the β‐process to the rotation of carboxylic groups.…”

Section: Resultsmentioning

confidence: 99%

Investigating the Free‐Volume Characteristics of Regulated Dimethacrylate Networks Below and Above Glass Transition Temperature

Švajdlenková

Šauša

Maťko

et al. 2018

Macro Chemistry & Physics

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Studying the relationship between microstructural interactions and resulting macroscopic material properties gives a more elaborate understanding on final material performance. The microstructural arrangement with characteristic length, relaxation, and thermal expansion behavior of regulated dimethacrylate networks is studied by differential scanning calorimetry, dynamic mechanical analysis, thermomechanical analysis, and positron annihilation lifetime spectroscopy at a broad temperature range (250–380 K). The length scale ξ (Tg) of cooperative segmental rearrangement is decreased with increasing crosslinking and degree of freedom in regulated chain transfer agent (CTA)‐based networks. The macro and microscopic thermal expansion coefficients are determined in the glassy and rubbery state for three polymer systems—a dimethacrylate‐based reference (poly2M) and regulated photopolymers with CTAs (i.e., thiol, β‐allyl sulfone). The influence of CTAs on the free volume characteristics (i.e., free volume void size, the specific occupied volume V0, free volume number density per unit mass N′, and free volume fraction f) at the glass transition temperature Tg is correlated with the cooperative length, activation energy Ea,α, and mechanically effective crosslinking density. A more complex understanding of the revealed relations contributes to a more elaborate explanation of final material performance.

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Viscoelastic behavior of PMMA in relation to deformation mode

Cited by 24 publications

References 39 publications

Experimental investigations and numerical simulations of innovative lightweight glass–plastic-composite panels made of thin glass and PMMA

Experimental investigations and numerical simulations of innovative lightweight glass–plastic-composite panels made of thin glass and PMMA

Is the assumption of linear elasticity within prosthodontics valid for polymers? —An exemplary study of possible problems

Investigating the Free‐Volume Characteristics of Regulated Dimethacrylate Networks Below and Above Glass Transition Temperature

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