This paper aims to investigate the cutting behavior of optical glassy polymers in order to identify the shape defects induced by the micro-machining processes.
Polycarbonate (PC), Allyl Diglycol Carbonate (CR39), and polythiourethane (MR7) polymers are considered in this study to perform micro-machining experiments using the orthogonal cutting confi...
This paper aims to investigate the cutting behavior of optical glassy polymers in order to identify the shape defects induced by the micro-machining processes. Polycarbonate (PC), Allyl Diglycol Carbonate (CR39), and polythiourethane (MR7) polymers are considered in this study to perform micro-machining experiments using the orthogonal cutting conf...
Investigation of mixed-gas sorption is necessary for robust design and optimization of membrane-based processes. While sorption models for glassy polymers are well-established, they often deviate from observed mixture data. In doing so, however, parameters of these models are typically estimated via traditional least-squares optimization methods, a...
The stress-strain curve of a glassy polymer can be divided into 4 different regimes. First the linear elastic regime, where stress linearly increases with strain; then yield at strain values of a few percents, characterised by a maximum in the stress-strain curve of order tens of MPa; the strain softening regime follows, defined by a decrease of st...
FFT-based solvers are increasingly used by many researcher groups interested in modelling the mechanical behavior associated to a heterogeneous microstructure. A development is reported here that concerns the viscoelastic behavior of composite structures generally studied experimentally through Dynamic Mechanical Analysis (DMA). A parallelized comp...
A new fitting model for sorption by glassy polymers is suggested based on the Flory–Huggins (FH) equation with a composite formula for the FH interaction parameter, χ, which is applicable if sorption experimental data shows a single-maximum variation of the FH parameter. Namely, a power-like and a linear approximation is assumed for χ(φ1), as a fun...
A novel experimental technique based on in situ AFM monitoring of the mechanisms of damage and the strain fields associated to the slow steady-state propagation of a fracture in glassy polymers is presented. This micron-scale investigation is complemented by optical measurements of the sample deformation up to the millimetric macroscopic scale of t...
Published in Colloid and Polymer Science
The statistical distribution of the lap-shear strength (σ) developed upon the contact of the thick (bulk) films of amorphous polystyrene (PS) and poly(methyl methacrylate) (PMMA) for a short-term (1 h) contact at healing temperatures (T) in the surroundings or well below the bulk glass transition temperature (Tgbulk), down to T = Tgbulk − 50 K, has...
peer reviewed / A large strain hyperelastic phenomenological constitutive model is proposed to model the highly nonlinear, rate-dependent mechanical behavior of amorphous glassy polymers under isothermal conditions. A corotational formulation is used through the total Lagrange formalism. At small strains, the viscoelastic behavior is captured using...
Published in Colloid and Polymer Science
For the first time, the strength distribution upon the bonding onset between the contacting glassy polymer samples has been analysed by employing the Weibull statistics. It has been found that the distribution of the lap-shear strength (σ) developed between the contacting pieces of such representative amorphous polymers as atactic polystyrene (PS) ...
