scholarly journals Structural Safety Analysis on Crack Propagation in Compact Tension Specimen

2014 ◽  
Vol 5 (1) ◽  
pp. 23-27
Author(s):  
Jae-Ung Cho
Keyword(s):  
Crack Propagation ◽  
Safety Analysis ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Structural Safety ◽  
Tension Specimen

Analysis of the Crack Propagation Based on Extended Finite Method

2013 ◽  
Vol 275-277 ◽  
pp. 169-173 ◽  
Author(s):  
Zhen Wen Jang ◽  
Shui Wan ◽  
Chen Cheng
Keyword(s):  
Crack Propagation ◽  
Crack Growth ◽  
Circular Hole ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Mode I ◽  
Shape Functions ◽  
Tension Specimen ◽  
Calculation Results ◽  
Finite Method

For solve efficiently the problem of crack propagation, the extended finite method(XFEM) was applied to analyse the problem. The extended finite method introduced nodal enrichment functions based on usual nodal shape functions, and traced crack propagation with the level set method. The extended finite method can model arbitrary crack growth without remeshing. This paper simulated the problem of the compact tension specimen with circular hole by extended finite method. The calculation results show that the extended finite method can solve efficiently the problem of crack growth , and the circular hole of compact tension specimen effect the trajectory of mode I crack propagation within certain distance.

Analysis of a main fatigue crack interaction with multiple micro-cracks/voids in a compact tension specimen repaired by stop-hole technique

2018 ◽  
Vol 53 (8) ◽  
pp. 648-662 ◽  
Author(s):  
Mohammad Malekan ◽  
Hermes Carvalho
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Growth ◽  
Growth Period ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Tension Specimen ◽  
Extended Finite Element ◽  
Forming Process ◽  
Micro Cracks

Fatigue is a process in engineering materials in which damage accumulates due to the fluctuating loading. One solution for a component under the fatigue process is to arrest the crack propagation before the final failure using different available retardation methods, such as drilling/stop-hole technique. In addition, structural components may also suffer from the existence of micro-cracks or voids due to their forming process or service lives. These micro-cracks/voids are very critical to study, since they can effectively play an important role in the behavior of the existing main crack in a component. This article aims to investigate the effect of the stop-hole retardation technique and multiple micro-cracks/voids with different characteristic lengths and geometries on the fatigue crack propagation in a compact tension specimen. A modified Forman equation, the so-called NASGRO equation is used to define the transition between crack initiation and crack growth period. Also, the extended finite element method is adapted in the crack propagation phase in order to model crack path in the geometry eliminating the need for remeshing procedure. The whole analyses are conducted in a commercial package through a user-written code that handles all fatigue crack growth analysis. The reference solutions from the literature are used to compare and to validate results obtained from current work.

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