Assessment of Damage and Fracture Behaviours in a Cast Aluminium Alloy via In Situ Synchrotron Microtomography

2006 ◽  
Vol 519-521 ◽  
pp. 1005-1010 ◽  
Author(s):  
Shin Yamamoto ◽  
Hiroyuki Toda ◽  
L. Qian ◽  
Tomomi Ohgaki ◽  
Masakazu Kobayashi ◽  
...  
Keyword(s):  
Driving Forces ◽  
Crack Opening ◽  
Crack Tip ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Contrast Imaging ◽  
Cracking Behavior ◽  
Damage And Fracture ◽  
Void Initiation

High resolution phase contrast imaging technique has been applied to obtain clear crack images together with the detailed of microstructural features in a cast aluminum alloy. Crack opening/closure, crack extension and damage evolution in the vicinity of a crack-tip is observed three-dimensionally (3-D). 3-D image analysis is performed to evaluate void initiation and growth near the crack-tip. The information on physical displacement of each microstructural feature is provided for analyzing local crack driving forces at crack front. This technique has been identified to provide a unique possibility to quantitatively interpret the 3-D cracking behavior in bulk materials.

Influence of Martensitic Phase on Microcrack Propagation in a Ferritic-Martensitic Steel

2014 ◽  
Vol 891-892 ◽  
pp. 301-306 ◽  
Author(s):  
Angelika Brueckner-Foit ◽  
Pascal Pitz ◽  
Frank Zeismann ◽  
Lisa Zellmer
Keyword(s):  
Dual Phase Steel ◽  
Martensitic Steel ◽  
Crack Opening ◽  
Crack Tip ◽  
Relative Displacement ◽  
Image Correlation ◽  
X Ray ◽  
Crack Wake ◽  
Microcrack Propagation

Hard phases such as martensite regions affect micro-crack extension by blocking the plastic zone ahead of the crack tip, but also by changing the crack opening which can be taken as loading quantity for cracks. This paper deals with the measurement of crack opening for microcracks in a ferrite/martensite dual phase steel. The methods used are in-situ testing in the SEM, X-ray tomography, and digital image correlation. It was found that martensite regions affect the relative displacement of the crack phases both at the crack tip and in the crack wake.

scholarly journals In situ 3D characterization of high temperature fatigue damage mechanisms in a cast aluminum alloy using synchrotron X-ray tomography

2016 ◽  
Vol 113 ◽  
pp. 254-258 ◽  
Author(s):  
Sebastien Dezecot ◽  
Jean-Yves Buffiere ◽  
Alain Koster ◽  
Vincent Maurel ◽  
Fabien Szmytka ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
High Temperature ◽  
Fatigue Damage ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Damage Mechanisms ◽  
X Ray ◽  
High Temperature Fatigue

scholarly journals Three-Dimensional In Situ XCT Characterisation and FE Modelling of Cracking in Concrete

Complexity ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Wenyuan Ren ◽  
Zhenjun Yang ◽  
Rajneesh Sharma ◽  
Samuel A. McDonald ◽  
Paul M. Mummery
Keyword(s):  
Fe Simulation ◽  
Fracture Behaviour ◽  
Crack Opening ◽  
Three Dimensional ◽  
Internal Crack ◽  
Fe Modelling ◽  
Internal Damage ◽  
Damage And Fracture ◽  
Discrete Crack

Three-dimensional (3D) characterisation and modelling of cracking in concrete have been always of great importance and interest in civil engineering. In this study, an in situ microscale X-ray computed tomography (XCT) test was carried out to characterise the 3D microscale structure and cracking behaviour under progressive uniaxial compressive loading. The 3D cracking and fracture behaviour including internal crack opening, closing, and bridging were observed through both 2D tomography slices and 3D CT images. Spatial distributions of voids and cracks were obtained to understand the overall cracking process within the specimen. Furthermore, the XCT images of the original configuration of the specimen were processed and used to build microscale realistic 3D finite element (FE) models. Cohesive interface elements were inserted into the FE mesh to capture complicated discrete crack initiation and propagation. An FE simulation of uniaxial compression was conducted and validated by the in situ XCT compression test results, followed by a tension simulation using the same image-based model to investigate the cracking behaviour. The quantitative agreement between the FE simulation and experiment demonstrates that it is a very promising and effective technique to investigate the internal damage and fracture behaviour in multiphasic composites by combining the in situ micro XCT experiment and image-based FE modelling.

3D Observation and Image-Based Finite Element Analyses of Fatigue Crack Propagation in an Al-Mg-Si Alloy

2010 ◽  
Vol 89-91 ◽  
pp. 449-454 ◽  
Author(s):  
Peng Chang Qu ◽  
Hiroyuki Toda ◽  
Hui Zhang ◽  
L. Qian ◽  
M. Sakaguchi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Fatigue Crack ◽  
Crack Front ◽  
Driving Forces ◽  
Crack Opening ◽  
Front Line ◽  
Mode Iii ◽  
Complex Deformation ◽  
Crack Morphology

3D fatigue crack opening and propagation behaviors in an Al-Mg-Si alloy have been investigated in this study. A combined methodology of an in-situ 3D crack visualization via the synchrotron X-ray CT and image-based numerical simulation which takes into account real crack morphology has been applied for the study. The details of a crack with non-planar torturous crack morphology have been observed and many essential features of the crack and its opening/propagation inside the material have been identified. Typical example would be the complex deformation behaviors in the region where two crack segments lying on different horizontal planes overlap each other, and the influence of complicated crack front line on local crack driving forces. We recognized that two overlapping crack segments affected significantly the local crack driving force ΔkI each other, and large mode III displacement occurred near the edge of overlapping region. The region next to overlapping was influenced to a relatively large extent through shielding the near-tip stress/strain fields thereby reducing the local crack driving forces. We also found that the sharp extrusion on crack front line had no significant influence on neighboring cracks. The combined methodology of the in-situ 3D crack visualization and the image-based numerical simulation has been demonstrated to be powerful and feasible in revealing and understanding various fracture phenomena inside materials

THE PROCESS OF NANOMODIFYING CAST ALUMINUM ALLOY INGOTS FOR COMPONENTS OF AEROSPACE VEHICLES

2019 ◽  
Vol 20 (2) ◽  
pp. 268-276
Author(s):  
G. G. Krushenko ◽  
◽  
V. P. Nazarov ◽  
S. N. Reshetnikova ◽  
G. V. Dvirnyi ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Cast Aluminum Alloy ◽  
Cast Aluminum ◽  
Aerospace Vehicles
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