Structure, Mechanics and Failure of Stochastic Fibrous Networks : Part I - Microscale Considerations  

Oleh:

Wang, C. W. ; Berhan, L. ; Sastry, A. M.

Jenis: Article from Bulletin/Magazine
Dalam koleksi: Journal of Engineering Materials and Technology vol. 122 no. 4 (2000), page 450-459.
Topik: networks; structure; mechnaics; failure; stochastic fibrous networks; microscale considerations

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: JJ87.2 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Applications for porous fibrous materials range from electrochemical substrates to web reinforcement in polymeric composite materials. The details of local load transfer are studied in a class of cost - effective, stochastic fibrous networks used in battery applications, which form the substrate for a composite electrode. The connectivity of these materials is quantitatively related to modulus and strength, and detailed results of different simulations approaches in approximating material construction are discussed. In Part I, we discuss microscale assumptions, including beam type, nodal connections and equivalence of models to more physically realistic models. Simulation of large networks is computationally intensive, and show low - strain, non linear behaviour even when comprised of elastic elements when failure criteria (here, strength - of - materials) are applied to produce sequential rupture of beams and nodes. Strategies for effective simulation of these materials requires detailed analysis of the simplest assumptions which can be made at the microscale which produce acceptably realistic response. We show that simple Euler - Bernoulli beam elements can be used to effectively model such materials, even when segment lengths in a network are very small. Moreover, connections comprised of simple torsion springs produce realistic behaviour, and can mimic more realistic junctures by adaptation of the linear solution to a compliant zone model. In Part II of this work, we demonstrate the effect of model selection on full network behaviour, and also discuss issues of connectivity at the scale of the porous material rather than element - by - element. This work points toward use of simple constructions to model complex behaviour, and may ultimately provide insight into modeling of a large class of porous materials.

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