scholarly journals Crack Opening and Sliding Behavior in Fatigue Crack under Mixed-Mode Condition : Based on Image Correlation Method and FEM Analysis

2010 ◽  
Vol 76 (762) ◽  
pp. 182-189
Author(s):  
Kenichi SHIMIZU ◽  
Tashiyuki TORII ◽  
Junichi NYUYA
Keyword(s):  
Fatigue Crack ◽  
Mixed Mode ◽  
Crack Opening ◽  
Correlation Method ◽  
Fem Analysis ◽  
Image Correlation

scholarly journals Identification and Prediction of Mixed-Mode Fatigue Crack Path in High Strength Low Alloy Steel

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 504
Author(s):  
Jie Zhang ◽  
Cedric Kiekens ◽  
Stijn Hertelé ◽  
Wim De Waele
Keyword(s):  
Fatigue Crack ◽  
Digital Image Correlation ◽  
Crack Propagation ◽  
Digital Image ◽  
Mixed Mode ◽  
Standardized Test ◽  
Crack Tip ◽  
Shear Loading ◽  
Image Correlation ◽  
Crack Trajectory

The trajectory of fatigue crack growth is influenced by many parameters and can be irregular due to changes in stress distribution or in material properties as the crack progresses. Images of the surface of a standardized test specimen can be used to visualize the crack trajectory in a non-destructive way. Accurately identifying the location of the crack tip, however, is challenging and requires devoted image postprocessing. In this respect, digital image correlation allows to obtain full field displacement and strain fields by analysing changes of digital images of the same sample at different stages of loading. This information can be used for the purpose of crack tip tracking. This paper presents a combined experimental-numerical study of detection and prediction of fatigue crack propagation path by means of digital image correlation (DIC) and the extended finite element method (X-FEM). Experimental validation and analyses are carried out on a modified C(T) specimen in which a curved crack trajectory is triggered by introducing mixed-mode (tension + shear) loading. The developed tools are used for validating an automated framework for crack propagation prediction.

Study of Deformations for Thermoplastic Polyurethane Membrane by Finite Elements Method (FEM)

2016 ◽  
Vol 841 ◽  
pp. 72-76 ◽  
Author(s):  
Mihai Sorin Tripa ◽  
Adrian Botean ◽  
Lucia Ghioltean ◽  
Adriana Sorcoi ◽  
Călin Rareş Roman ◽  
...  
Keyword(s):  
Finite Elements ◽  
Mechanical Characteristics ◽  
Thermoplastic Polyurethane ◽  
Correlation Method ◽  
Fem Analysis ◽  
Finite Elements Method ◽  
Image Correlation ◽  
Wide Range ◽  
Made In ◽  
Polyurethane Membrane

The study about deformations of thermoplastic polyurethane membrane (desmopan membrane) is very important for a lot of industry domains (mechanic, transport, agriculture, chemistry, medicine, ...). This paper presents an original work about deformations by Finite Elements Method (FEM) analysis for desmopan membrane. Thermoplastic polyurethane (desmopan), an anisotropic material, is made in a very wide range of models and types. By Digital Image Correlation Method (DICM) we have determined mechanical characteristics [5].These with geometrical characteristics are required as input for FEM. Stresses [2] and deformations output of FEM, are necessary to calculate the fatigue resistance to limited durability to fracture [7]. After, we can study the membrane reliability of the desmopan membranes for diaphragm pumps.

Fatigue Crack Propagation in Haynes 230: A Comparison between Single and Polycrystal Crack Closure Levels

2016 ◽  
Vol 258 ◽  
pp. 243-248 ◽  
Author(s):  
Stefano Beretta ◽  
Stefano Foletti ◽  
Silvio Rabbolini ◽  
Huseyin Sehitoglu
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Crack Closure ◽  
Driving Forces ◽  
Crack Opening ◽  
Image Correlation ◽  
Accurate Estimation ◽  
Haynes 230 ◽  
Local Measurements ◽  
Plasticity Induced Crack Closure

An experimental campaign was developed to evaluate fatigue crack growth in Haynes 230. The effects of plasticity induced crack closure were investigated with Digital Image Correlation. In particular, crack opening levels were measured with the digital extensometer technique, which allowed the evaluation of crack flanks relative displacements. Experimental results were compared with a reference da/dn – ΔKeff curve and with the data of a previous study, which analyzed single crystal propagation. It was found that the adoption of crack closure local measurements provided an accurate estimation of crack propagation driving forces, since all the experimental points from single crystals and polycrystals collapse onto the da/dn – ΔKeff curve.

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