The fracture of microcapsules is an important issue to release the healing agent for cracks in encapsulation-based self-healing concrete. capsular clustering generated from concrete mixing process considered one critical factors mechanism. Since there a lack studies literature regarding this issue, design cannot be made without appropriate modelling strategy. In paper, effects microcapsule size...

The fracture mechanical behaviour of thin-walled structures with cracks is highly significant for structural strength design, safety and reliability analysis, defect evaluation. In this study, the effects various factors on parameters, crack initiation angles plastic zones cylindrical shells are investigated. First, based J-integral displacement extrapolation methods, stress intensity circumfer...

We present a combined novel methodology to study the three-dimensional complex geometry of a tortuous crack and identify the essential features of the crack and its propagation inside a heterogeneous material. We find that some severe damage events occur unexpectedly below a local mode-I crack within the sample; we realize that the severe plastic zone of the local mode-I crack is shifted down b...

Oxide dispersion strengthened Cu alloys (ODS-Cu) having dispersed yttria (Y2O3) fabricated using hot isostatic pressing (HIP) of mechanically alloyed (MA) Cu-Y powders. They exhibited a heterogeneous mixed grain structure, which were composed large and small area. In the regions, Y₂O₃ particles segregated along boundaries, acted as crack propagation path, leading to brittle fracture. Therefore,...

This paper investigates the phenomenon of slant fracture observed in stable tearing tests of many ductile materials, where an initially flat crack, loaded under remote Mode I conditions, tends to grow into a slant crack and stay in the slant configuration until final fracture. In an effort to identify potential reasons why cracks prefer to grow in a slant manner, three-dimensional finite elemen...

initial cracks occur in high strength concrete sleepers for various reasons, such as shrinkage and wrong curing and long lifetime of over 50 years of sleepers. these cracks may lead to complete failure of the structure. in order to more accurately design the sleepers, fracture mechanics (not strength of materials) should be incorporated. in order to achieve this purpose, it is important to fore...

Abstract Three asymmetric cracks were postulated at the circumferential horizontal weld H7 of a boiling water reactor type 5 core shroud after 25 years operation. They arranged in an irregular distribution with different depths. Unstable crack propagation can be induced when earthquake and loss coolant accident take place. In this paper, ductile failure analysis has been reported. It done follo...

The coal mine wind shaft is an important ventilation channel in mines, and it of great significance to ensure its long-term safety. At present, the inspection shafts still depends on manual work, which has low reliability high risk. There are two main problems wall detection shafts: (1) humidity dust concentration high, makes imaging difficult; (2) cracks long irregular, so impossible acquire i...