Crack growth detection for concrete structures based on non-contact displacement measurements

2014 ◽  
pp. 5103-5108
Author(s):  
T Kusaka ◽  
Y Nomura ◽  
Y Hineno ◽  
T Fujii
Keyword(s):  
Crack Growth ◽  
Concrete Structures ◽  
Contact Displacement ◽  
Growth Detection ◽  
Displacement Measurements

scholarly journals Development of a Compound Speckle Interferometer for Precision Three-Degree-of-Freedom Displacement Measurement

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1828
Author(s):  
Hung-Lin Hsieh ◽  
Bo-Yen Sun
Keyword(s):  
Speckle Interferometry ◽  
Degree Of Freedom ◽  
Heterodyne Interferometry ◽  
Beam Splitting ◽  
Speckle Interferometer ◽  
Real World Applications ◽  
Three Degree Of Freedom ◽  
Contact Displacement ◽  
Displacement Measurements ◽  
Measurement Capabilities

In this study, a compound speckle interferometer for measuring three-degree-of-freedom (3-DOF) displacement is proposed. The system, which combines heterodyne interferometry, speckle interferometry and beam splitting techniques, can perform precision 3-DOF displacement measurements, while still having the advantages of high resolution and a relatively simple configuration. The incorporation of speckle interferometry allows for non-contact displacement measurements by detecting the phase of the speckle interference pattern formed from the convergence of laser beams on the measured rough surface. Experiments were conducted to verify the measurement capabilities of the system, and the results show that the proposed system has excellent measurement capabilities suitable for future real-world applications.

A fictitious crack XFEM with two new solution algorithms for cohesive crack growth modeling in concrete structures

2015 ◽  
Vol 32 (2) ◽  
pp. 473-497 ◽  
Author(s):  
Xiaodong Zhang ◽  
Tinh Quoc Bui
Keyword(s):  
Finite Element ◽  
Nonlinear System ◽  
Crack Growth ◽  
Concrete Structures ◽  
Research Paper ◽  
Cohesive Crack ◽  
Multiple Cracks ◽  
System Of Equations ◽  
Nonlinear System Of Equations ◽  
Content Type

Purpose – The purpose of this paper is to achieve numerical simulation of cohesive crack growth in concrete structures. Design/methodology/approach – The extended finite element method (XFEM) using four-node quadrilateral element associated with the fictitious cohesive crack model is used. A mixed-mode traction-separation law is assumed for the cohesive crack in the fracture process zone (FPZ). Enrichments are considered for both partly and fully cracked elements, and it thus makes the evolution of crack to any location inside the element possible. In all. two new solution procedures based on Newton-Raphson method, which differ from the approach suggested by Zi and Belytschko (2003), are presented to solve the nonlinear system of equations. The present formulation results in a symmetric tangent matrix, conveniently in finite element implementation and programming. Findings – The inconvenience in solving the inversion of an unsymmetrical Jacobian matrix encountered in the existing approach is avoided. Numerical results evidently confirm the accuracy of the proposed approach. It is concluded that the developed XFEM approach is especially suitable in simulating cohesive crack growth in concrete structures. Research limitations/implications – Multiple cracks and crack growth in reinforced concretes should be considered in further studies. Practical implications – The research paper presents a very useful and accurate numerical method for engineering application problems that has ability to numerically simulate the cohesive crack growth of concrete structures. Originality/value – The research paper provides a new numerical approach using two new solution procedures in solving nonlinear system of equations for cohesive crack growth in concrete structures that is very convenient in programming and implementation.

scholarly journals Machine learning based real-time visible fatigue crack growth detection

2021 ◽  
Author(s):  
Le Zhang ◽  
Zhichen Wang ◽  
Lei Wang ◽  
Zhe Zhang ◽  
Xu Chen ◽  
...  
Keyword(s):  
Machine Learning ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Real Time ◽  
Crack Growth ◽  
Growth Detection
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