Implementation of A Cohesive Zone Model on A Cracked Plate to Estimate the Stress Intensity Factor  

Oleh:

Liong, A. Rugerri Toni ; De Fretes, Anthon

Jenis: Article from Journal - ilmiah nasional - tidak terakreditasi DIKTI - atma jaya
Dalam koleksi: Cylinder: Jurnal Ilmiah Teknik Mesin vol. 1 no. 1 (Apr. 2012), page 1-8.
Topik: Cohesive Zone Model; Fracture Mechanics; Crocked Plate; Stress Intensity Factor.
Fulltext: A. Rugerri Toni Liong and Anthon de Fretes 1-8.pdf (1.89MB)

Isi artikel

In recent years, the cohesive zone model (CZM) approach has emerged as a popular tool for investigating fracture processes in materials and structures. In a CZM. a narrow band of vanishing thickness termed the cohesive zone is assumed to exist ahead of a crack tip to represent the fracture process zone. The upper and lower surfaces of the narrow-band are termed as the cohesive surfaces and are acted by the so-called cohesive traction which follows a cohesive constitutive law that relates the cohesive traction to the separation displacement of the cohesive surface. Crack growth occurs when the separation at the tail of the cohesive zone (physical crack tip) reaches a critical value at which the cohesive traction vanishes. Clearly, the CZM approach does not involve crack tip stress singularities in classical fracture mechanics, and material failure is controlled by quantities such as displacements and stresses, which are consistent with the usual strength of materials theory. This paper aims at the implementation of CZM on a cracked plate to estimate the stress intensity factor (SIF). The CZM using traction-separation law (TSL) is implemented in the finite element (FE) modeling. Stress distribution on a cracked plate based on linear-elastic fracture mechanics (LEFM), also on elastic-plastic fracture mechanics (EPFM) like Irwin's model, Dugdale's model and the CZM are explored. These implementations are made to show that the presence of cohesive elements in a zone ahead of the crack tip has stresses lowering due to the softening of cohesive elements.

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