scholarly journals Determination of some characteristic fracture of concrete of notched beam in bending test

2020 ◽  
Vol 61 (HTCS6) ◽  
pp. 96-101
Author(s):  
Bui Truong Son ◽  
Pham Duc Tho ◽  
Nguyen Thi Nu ◽  
Tran The Truyen ◽  
Tran Nam Hung ◽  
...  
Keyword(s):  
Stress Intensity ◽  
Critical Stress ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Bending Test ◽  
Intensity Factors ◽  
Simulation Results ◽  
Compression Resistance

This paper presents the identification some principal fracture parameters of concretes by experiment and simulation on notched beam in bending. The comparison between experimental and simulation results allows to determinate the Critical stress intensity factors KIC, fracture energy Gf and characteristic lengths of fracture process zone (FPZ) lch of 6 class of concrete with the compression resistance varying from 20 MPa to 50 MPa. These are important parameter in the model for predicting the timelife of concrete structure exposed in coastal area.

scholarly journals Determining the Fracture Process Zone Length and Mode I Stress Intensity Factor in Concrete Structures via Mechanoluminescent Technology

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1257
Author(s):  
Seong-Kyum Kim ◽  
Ho Geun Shin ◽  
Suman Timilsina ◽  
Ji Sik Kim
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Structural Health Monitoring ◽  
Intensity Factor ◽  
Health Monitoring ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Monitoring Systems ◽  
Health Monitoring Systems

The mechanoluminescent (ML) technology that is being developed as a new and substitutive technology for structural health monitoring systems (SHMS) comprises stress/strain sensing micro-/nanoparticles embedded in a suitable binder, digital imaging system, and digital image processing techniques. The potential of ML technology to reveal the fracture process zone (FPZ) that is commonly found in structural materials like concrete and to calculate the stress intensity factor (SIF) of concrete, which are crucial for SHMS, has never been done before. Therefore, the potential of ML technology to measure the length of the FPZ and to calculate the SIF has been demonstrated in this work by considering a single-edge notched bend (SENB) test of the concrete structures. The image segmentation approach based on the histogram of an ML image as well the skeletonization of an ML image have been introduced in this work to facilitate the measurement of the length of ML pattern, crack, and FPZ. The results show ML technology has the potential to determine fracture toughness, to visualize FPZ and cracks, and to measure their lengths in structural material like concrete, which makes it applicable to structural health monitoring systems (SHMS) to characterize the structural integrity of structures.

Applications of Acoustic Emission Technique Associated with the Fracture Process Zone in Concrete Beam – A Review

2012 ◽  
Vol 626 ◽  
pp. 147-151 ◽  
Author(s):  
Siti Ramziah Basri ◽  
Norazura Muhamad Bunnori ◽  
Sakhiah Abdul Kudus ◽  
Shahidan Shahiron ◽  
Mohd Nazli Md. Jamil ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Concrete Beam ◽  
Process Zone ◽  
Failure Mechanisms ◽  
Aggregate Size ◽  
Plain Concrete ◽  
Bending Test ◽  
Acoustic Emission Technique

This paper summarized the recent development within the application of acoustic emission technique in the formation of fracture process zone and the AE energy released during the fracture process in concrete beam specimens. AE technique is a non destructive technique which is a useful tool to study the energy released during the different failure mechanisms in different types of materials and fracture process is one of the failure mechanisms in concrete. Most of the researchers were applied three point bending test on plain concrete in order to determine the facture process zone of the concrete and some of them were used numerical modeling to verify their results. The results between AE data and experimental in different parameters such as specimens size and aggregate size are normally compared. As a conclusion, AE technique is a very useful tool to determine the fracture process zone in concrete.

Experimental determination of the fracture process zone in concrete

1983 ◽  
Vol 13 (4) ◽  
pp. 557-567 ◽  
Author(s):  
Luigi Cedolin ◽  
Sandro Dei Poli ◽  
Ivo Iori
Keyword(s):  
Experimental Determination ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone

Estimation of the Zone of Failure Extent in Quasi-Brittle Specimens with Different Crack-Tip Constraint Conditions from Stress Field

2013 ◽  
Vol 592-593 ◽  
pp. 262-265 ◽  
Author(s):  
Václav Veselý ◽  
Jakub Sobek ◽  
Petr Frantík ◽  
Michal Štafa ◽  
Lucie Šestáková ◽  
...  
Keyword(s):  
Stress Field ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
Process Zone ◽  
Crack Tip ◽  
Bending Test ◽  
Stress Fields ◽  
Three Point Bending ◽  
Higher Order Terms ◽  
Crack Tip Constraint

A multi-parameter fracture mechanics concept based on the Williams power series is applied on novel cracked specimen geometries utilizing combined boundary conditions of the wedge splitting and the three-point bending test. Crack tip stress fields for various configurations (causing different constraint conditions at the crack tip and thus also different fracture process zone extents) are numerically investigated and subsequently analytically reconstructed using developed procedure. An importance of using higher order terms of the Williams series is demonstrated.

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