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Showing 1 to 15 of 15 for “"cohesive fracture"”.
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Anti-plane Shear of Cylinders and Layered Systems: Cohesive Fracture and Instability
… research examines the mechanics of mode-III cohesive fracture by defect initiation and quasi-static growth in both cylinder and layered systems. The analysis, which is exact, is based on the solution of two fundamental elasticity problems: i) a cylinder subject to an arbitrary shear on one …
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A hybrid technique to extract cohesive fracture properties of elasto-plastic materials using inverse analysis and digital image correlation
Item released from any restrictions by Sarah Shreeves (sshreeve@illinois.edu) on 2012-05-19T10:00:18Z
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Functionally Graded Fiber-Reinforced Cementitious Composites---Manufacturing and Extraction of Cohesive Fracture Properties Using Finite Elements and Digital Image Correlation
… a hybrid technique for the extraction of mode I cohesive zone model (CZM). First, a full-field digital image correlation (DIC) technique has been adopted to compute the two-dimensional displacement fields. Such displacement fields are used as the input to the finite element (FE) formulation of an …
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Photo-Curing Behavior and Thermal Properties of Silicone Semi Interpenetrating Polymer Network (Semi-IPN) Organogels
… thermal, mechanical, viscoelastic and adhesive/cohesive fracture properties of silicone semi-interpenetrating polymer network organogels. Curing time may affect the extent of reaction and the crosslink density of a gel network. In order to investigate the effect of this parameter, materials were …
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Failure processes in soft and quasi-brittle materials with nonhomogeneous microstructures
… in structural engineering, understanding the fracture of concrete and steel can lead to improved structural systems and safer designs; in geological engineering, understanding the fracture of rock can lead to increased efficiency in oil and gas extraction; and in biological engineering, …
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Computational modeling of crack initiation in cross-role piercing
… tile specimen is studied. Other simple ductile fracture criteria that are proposed in literature are also implemented. An interface model for fracture using the discontinuous Galerkin framework combined with a cohesive fracture law is implemented. This approach and its advantages are illustrated …
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Strength Development at Incompatible Polymer Interfaces
… parameter, X. Microscopic investigation of the fracture surfaces revealed dissimilar fracture surfaces for a given pair, with evidence of stick-slip crack growth. X-ray photoelectron spectroscopy revealed residues of one polymer on the other's surface, indicating cohesive fracture occurred to …
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Potential-Based Fracture Mechanics Using Cohesive Zone and Virtual Internal Bond Modeling
… of nonlinear constitutive relationships along fracture surfaces is a fundamental issue in mixed-mode cohesive fracture simulations. A generalized potential-based constitutive theory of mixed-mode fracture is proposed in conjunction with physical quantities such as fracture energy, cohesive …
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Spacetime damage-based cohesive model for elastodynamic fracture with dynamic contact
… and implementation of an interfacial-damage, cohesive-fracture model, including contact and friction effects, for dynamic failure of brittle materials. The model is implemented within a spacetime discontinuous Galerkin (SDG) finite element method. An adaptive meshing procedure generates %When …
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Fracture of Asphalt Concrete: A Cohesive Zone Modeling Approach Considering Viscoelastic Effects
… that exhibits time and temperature dependent fracture behavior. Softening of the material can be associated to interlocking and sliding between aggregates, while the asphalt mastic displays cohesion and viscoelastic properties. To properly account for both progressive softening and …
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Characterization of the Viscoelastic Fracture of Solvated Semi-Interpenetrating Polymer Network Silicone Hydrogels
… attempting to understand their constitutive and fracture properties in order to improve hydrogel manufacturing and performance in applications. In this thesis, a series of experimental techniques were developed or adapted from common engineering approaches in order to investigate the effects of …
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Clarification of the notched beam Level II Testing Procedures of ACI 446 Committee Report 5
… is not only a gross oversimplification of the fracture process of concrete in tension, but is also overly conservative. However, research in the field of fracture mechanics has produced models that can accurately predict crack propagation in concrete using fracture parameters determined from …
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Influence of the Interphase on the Mechanical Properties of Nylon 66 Composites
… Scanning electron microscopy revealed a more cohesive fracture surface of the samples having a transcrystalline interphase. Dynamic mechanical analysis showed that the damping behavior of E-glass/nylon 66 composites does not change with PVP sizing, while carbon fiber/nylon 66 composites showed …
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A Computational Thermo-Chemo-Mechanics Framework for the Large-Scale Simulation of Material and Structural Failure in Hypersonic Environments
… flight undergo complex degradation and fracture processes. This thesis presents a theoretical formulation and a computational framework that enables the large-scale simulation of thermochemically fracturing solids exhibiting complex post-fracture interface response. The continuum theory …