Seyyed Ahmad HosseiniFriedrich-Alexander-University of Erlangen-Nürnberg | FAU
Seyyed Ahmad Hosseini
Doctor of Engineering
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16
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Publications (16)
Creep failure of hierarchical materials is investigated by simulation of beam network models. Such models are idealizations of hierarchical fibrous materials where bundles of load-carrying fibers are held together by multi-level (hierarchical) cross-links. Failure of individual beams is assumed to be governed by stress-assisted thermal activation o...
Quasibrittle materials endowed with (statistically) self-similar hierarchical microstructures show distinct failure patterns that deviate from the standard scenario of damage accumulation followed by crack nucleation and growth. Here we study the failure of paper sheets with hierarchical slice patterns as well as nonhierarchical and unpatterned ref...
Hierarchical microstructures are often invoked to explain the high resilience and fracture toughness of biological materials such as bone and nacre. Biomimetic material models inspired by such hierarchical biomaterials face the obvious challenge of capturing their inherent multiscale complexity, both in experiments and in simulations. To study the...
The present work aims to investigate the bending analysis of sandwich and laminated carbon nanotube coated–fiber multi-scale composite (CFMC) beams employing the Refined Zigzag Theory (RZT). The model encompasses core fiber, surrounding carbon nanotube (CNT) coating region, and polymer matrix covering all scales from nano to macro-scale. Hierarchic...
Quasi-brittle materials endowed with (statistically) self-similar hierarcical microstructures show distinct failure patterns that deviate from the standard scenario of damage accumulation followed by crack nucleation-and-growth. Here we study the failure of paper sheets with hierarchical slice patterns as well as non-hierarchical and unpatterned re...
By introducing hierarchical patterns of load-parallel cuts into axially loaded brittle sheets, the resistance to propagation of mode-I cracks is very significantly enhanced. We demonstrate this effect by simulation of two-dimensional beam network models and experimentally by testing paper and polystyrene (PS) sheets that are sliced with a laser cut...
Hierarchical microstructures are often invoked to explain the high resilience and fracture toughness of biological materials such as bone and nacre. Biomimetic material models inspired by those structural arrangements face the obvious challenge of capturing their inherent multi-scale complexity, both in experiments and in simulations. To study the...
The abundance of hierarchical structures in nature, from the modular organization of collagen to tendon and brain, and from mollusk shell to bone and wood, reflects a universal tendency of biological systems after millions of years of evolution to be organized in a hierarchical modular fashion. This microstructural architecture can serve conflictin...
The effect of carbon nanotube (CNT) coated-carbon fibers on thermal residual stresses of multi-scale hybrid composites is assessed employing analytical approach. The model comprises carbon fiber, coating region and surrounding matrix, in which the coating region around core fiber encompasses CNTs and matrix. Considering three configurations of grow...
We introduce a beam network model for hierarchically patterned materials. In these materials, load-parallel gaps intercept stress transmission in the load perpendicular direction in such a manner that damage is confined within hierarchically nested, load-carrying ‘modules’. We describe the morphological characteristics of such materials in terms of...
A beam network model is used to study the nucleation and propagation of cracks in uniaxially loaded materials consisting of randomly cross‐linked fibers with statistically distributed failure thresholds. The failure behavior of such materials is investigated and, for different degrees of disorder, the fraction of cross links required to achieve an...
Mechanical behavior of SiO2 nanoparticle-epoxy matrix composites was investigated via finite element analysis with an emphasis on the nanofiller-interphase debonding effect using a three-dimensional nanoscale representative volume element (RVE). The new model, in which a cohesive zone material (CZM) layer is considered as an inclusion-interphase bo...
Low-velocity impact analysis of 3D woven hollow core sandwich composite was conducted experimentally and numerically. Damage modes, perforation loads, load-time and energy-time curves, contact time, force-displacement and deflection-energy relationships were studied for three energy levels on specimens with different thicknesses utilizing both FE s...
The influence of Stone–Thrower–Wales (STW) defect is scrutinized on the fundamental frequency of single walled carbon nanotube invoking molecular mechanics approach. The modal finite element analysis is carried out by employing Timoshenko׳s beam element to construct the Carbon–Carbon bond of CNT lattice structure. Hence, three configurations of def...