Deformation and failure maps for PMMA in uniaxial tension

Loock, Frederik Van; Fleck, N.A.

doi:10.1016/j.polymer.2018.06.027

Cited by 32 publications

(56 citation statements)

References 48 publications

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“…The solid PMMA is compared with the nanocomposite 2%‐S, together with their corresponding cellular materials at high relative density (close to 0.5). The solid and cellular materials initially deform in a linear, elastic manner up until the yield point after which softening and subsequent hardening is observed . The elastic (secant) modulus E is measured from the slope of the initial linear region.…”

Section: Resultsmentioning

confidence: 99%

“…The solid and cellular materials initially deform in a linear, elastic manner up until the yield point after which softening and subsequent hardening is observed. [46] The elastic (secant) modulus E is measured from the slope of the initial www.advancedsciencenews.com www.mme-journal.de linear region. The compressive yield strength σ y corresponds to the peak load before softening.…”

Section: Cellular Structurementioning

confidence: 99%

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Mechanical Properties of PMMA‐Sepiolite Nanocellular Materials with a Bimodal Cellular Structure

Bernardo

Loock

León

et al. 2019

Macro Materials & Eng

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Bimodal cellular poly(methyl methacrylate) with micro‐ and nano‐sized (300–500 nm) cells with up to 5 wt% of sepiolite nanoparticles and porosity from 50% to 75% are produced by solid‐state foaming. Uniaxial compression tests are performed to measure the effect of sepiolite concentration on the elastic modulus and the yield strength of the solid and cellular nanocomposites. Single edge notch bend tests are conducted to relate the fracture toughness of the solid and cellular nanocomposites to sepiolite concentration. The relative modulus is independent of sepiolite content to within material scatter when considering the complete porosity range. In contrast, a mild enhancement of the relative modulus is observed by the addition of sepiolite particles for the foamed nanocomposites with a porosity close to 50%. The relative compressive strength of the cellular nanocomposites mildly decreases as a function of sepiolite concentration. A strong enhancement of the relative fracture toughness by the addition of sepiolites is observed. The enhancement of the relative fracture toughness and the relative modulus (at 50% porosity) can be attributed to an improved dispersion of the particles due to foaming and the migration of micro‐sized aggregates from the solid phase to the microcellular pores during foaming.

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Section: Resultsmentioning

confidence: 99%

Section: Cellular Structurementioning

confidence: 99%

Mechanical Properties of PMMA‐Sepiolite Nanocellular Materials with a Bimodal Cellular Structure

Bernardo

Loock

León

et al. 2019

Macro Materials & Eng

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“…The operative deformation mechanism depends upon the temperature g / TT , the strain rate e  , and strain e  . We shall make use of the constitutive models as calibrated by Van Loock and Fleck [19]…”

Section: Constitutive Model For the Pmma-co2 Solidmentioning

confidence: 99%

“…where  is a temperature-dependent viscosity [37,38]: (24) in terms of a reference viscosity 0  at g / TT = 1; 1 C and 2 C are fitting constants. [19] and are summarized in Table 3. Table 3.…”

Section: Constitutive Model For the Pmma-co2 Solidmentioning

confidence: 99%

“…The values of the processing parameters and the material properties are summarized in Table 4. Note that the initial porosity 0 f is: (28) and is estimated 19 to equal 3 10 − for both the low w M and high w M PMMA nanofoams. The initial void radius 0 a is estimated by: 17 Measured by placing a thermocouple on the sample after pressure release at the end of the saturation phase.…”

Section: Void Growth Simulationsmentioning

confidence: 99%

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The mechanics of solid-state nanofoaming

et al. 2019

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Solid-state nanofoaming experiments are conducted on two PMMA grades of markedly different molecular weight using CO2 as the blowing agent. The dependence of porosity of the nanofoams upon foaming time and foaming temperature is measured. Also, the microstructure of the PMMA nanofoams is characterized in terms of cell size and cell nucleation density. A one dimensional numerical model is developed to predict the growth of spherical, gas-filled voids during the solid-state foaming process. Diffusion of CO2 within the PMMA matrix is sufficiently rapid for the concentration of CO2 to remain almost uniform spatially. The foaming model makes use of experimentally calibrated constitutive laws for the PMMA grades, and the effect of dissolved CO2 is accounted for by a shift in the glass transition temperature of the PMMA. The observed limit of achievable porosity is interpreted in terms of cell wall tearing;it is deduced that the failure criterion is sensitive to cell wall thickness.

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Effects of strain rate and temperature on the mechanical behavior of polymethyl methacrylate (PMMA)

Zhang

Sun

et al. 2022

Polym. Bull.

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Deformation and failure maps for PMMA in uniaxial tension

Cited by 32 publications

References 48 publications

Mechanical Properties of PMMA‐Sepiolite Nanocellular Materials with a Bimodal Cellular Structure

Mechanical Properties of PMMA‐Sepiolite Nanocellular Materials with a Bimodal Cellular Structure

The mechanics of solid-state nanofoaming

Effects of strain rate and temperature on the mechanical behavior of polymethyl methacrylate (PMMA)

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