A micro-continuum-mechanical material model for failure of rubber-like materials: Application to ageing-induced fracturing

Rubbery polymers are subjected to severe environmental conditions under service. As a consequence of various ageing mechanisms, the outer surface of rubber components hardens in time and cracking occurs as a result of combined mechanical and chemical processes. Conventional phenomenological hyperelastic constitutive models do not account for material softening. Consequently, the stored energy and stresses tend to infinity as stretch increases. In this contribution, a network alteration for the ageing mechanism of rubber-like materials is introduced along with a micromolecular description of material failure. The proposed micro-continuum material model is based on a serial construction of a Langevin-type spring representing the energy storage owing to conformational changes induced by deformation, to a bond potential representing the energy stored in the polymer chain due to the interatomic displacement. For the representation of the micro-macro transition, the non-affine kinematics of the microsphere model is used. The Morse potential is utilized for the interatomic bond, which describes the energetic contribution to rubber-like materials and governs the failure of the polymer chain in terms of bond rupture. A novel numerical scheme for the FE implementation of the proposed model is demonstrated. The hardening phenomenon as a result of diffusion limited oxidation of rubber is explained by the principle of mass conservation which dictates simultaneous modulus hardening along with decrease in ultimate stretch observed in aged rubbery polymers.


A fractographic study on toughening of epoxy resin using ground tyre rubber
Kaynak, Cevdet; Akovali, G. (2001-01-01)
This study is a fractographic examination of epoxy resin modified with scrap car tyre regrinds used as toughening phase. Five different surface treatment techniques, used to improve the compatibility at the interface between the rubber particles and the epoxy matrix, were: oxygen plasma, two silane coupling agents, acrylic acid and acrylic acid/benzoylperoxide mixture. Rubber parts of ground scrap car tyres with a size range of 355-500 mum after surface treatment were mixed with epoxy. This mixture was pour...
The control of fungi and mycotoxins by food active packaging: a review
Jafarzadeh, Shima; Hadidi, Milad; FOROUGH, MEHRDAD; Nafchi, Abdorreza Mohammadi; Khaneghah, Amin Mousavi (2022-01-01)
Conventionally used petrochemical-based plastics are poorly degradable and cause severe environmental pollution. Alternatively, biopolymers (e.g., polysaccharides, proteins, lipids, and their blends) are biodegradable and environment-friendly, and thus their use in packaging technologies has been on the rise. Spoilage of food by mycotoxigenic fungi poses a severe threat to human and animal health. Hence, because of the adverse effects of synthetic preservatives, active packaging as an effective technique fo...
The role of nanoparticle geometry in flame retardancy of polylactide nanocomposites containing aluminium phosphinate
Isitman, Nihat Ali; Doğan, Mehmet Onur; BAYRAMLI, ERDAL; Kaynak, Cevdet (2012-08-01)
Although there is considerable research effort in the development of halogen-free flame-retardant polylactide (PLA), a bio-based aliphatic polyester, the potential synergistic interactions of nanoparticles and conventional additives have scarcely been considered. Therefore, this study aimed to investigate the influence of nanofiller geometry on fire retardancy of PLA nanocomposites containing aluminium diethylphosphinate (AlPi) flame retardant. For this purpose, a variety of nanofiller geometries were utili...
KAMBHAM, KKR; Tuncay, Kağan; CORAPCIOGLU, MY (American Geophysical Union (AGU), 1995-05-01)
Leaks in geomembrane liners of waste landfills and liquid impoundments cause chemical contaminants to leak into the subsurface environment. A mathematical model is presented to simulate electrophoretic sealing of impoundment leaks. The model describes the formation of a compressible clay cake because of electrical and gravitational forces. The model includes mass balance equations for the solid-particles and liquid phase, modified Darcy's law in an electrical field, and Terzaghi's definition of effective st...
An Experimental study of particle size and concentration effects of calcium carbonate on rheological and filtration properties of drill-in fluids
Odabaşı, Aydın; Kök, Mustafa Verşan; Gücüyener, İ. Hakkı; Department of Petroleum and Natural Gas Engineering (2015)
Specially designed non-damaging Drill-In Fluids (DIF) are being effectively applied for drilling depleted zones worldwide. Shape, particle size distribution and concentration of materials like calcium carbonate (CaCO3) are key parameters determining the effectiveness of DIF. In this study, 3 different sized and 5 different concentrations CaCO3 are used to examine the effects of these factors on rheology and fluid loss of DIF. Sized calcium carbonates are used as major particles in different concentrations a...
Citation Formats
H. Dal, “A micro-continuum-mechanical material model for failure of rubber-like materials: Application to ageing-induced fracturing,” JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, pp. 1340–1356, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47934.