Magnetomechanical model for coating/substrate interface and its application in interfacial crack propagation length characterization

2018 ◽  
Vol 124 (20) ◽  
pp. 203904 ◽  
Author(s):  
Zhengchun Qian ◽  
Haihong Huang ◽  
Wenjie Liu ◽  
Lunwu Zhao ◽  
Gang Han
Keyword(s):  
Crack Propagation ◽  
Interfacial Crack ◽  
Propagation Length ◽  
Substrate Interface ◽  
Crack Propagation Length

A calculation model to assess the crack propagation length of rock block in clastic flow

2020 ◽  
Vol 17 (11) ◽  
pp. 2636-2651
Author(s):  
Yang Liu ◽  
Yong You ◽  
Jin-feng Liu ◽  
Shu-xi Zhao ◽  
Dong-xu Yang ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Calculation Model ◽  
Rock Block ◽  
Propagation Length ◽  
Crack Propagation Length

Engineering Advice for Preventing Crack on the Upstream Surface of Super-High Arch Dam

2013 ◽  
Vol 438-439 ◽  
pp. 1320-1324 ◽  
Author(s):  
Jun Feng Guan ◽  
Long Bang Qing ◽  
Wei Feng Bai ◽  
Juan Wang ◽  
Peng Lin
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Water Pressure ◽  
Arch Dam ◽  
High Arch Dam ◽  
Propagation Length ◽  
Crack Stability ◽  
Dam Concrete ◽  
The Relationship ◽  
Crack Propagation Length

In this paper, the crack stability and crack propagation regularity of the upstream surface of super-high arch dam along the water-stop structure were analyzed in the framework of fracture mechanics. According to fracture toughness of dam concrete, the relationship between the crack propagation length and the allowable water pressure was studied. Finally, two main specific engineering suggestions for avoiding this kind of crack on the upstream surface of super-high arch dam were given: (1) the value of checking water pressure should not exceed 0.4 MPa; (2) the flange of the water-stop structure near the upstream surface of dam should be changed toward the downstream.

Simulation of Reflective Crack Propagation Path in Asphalt Overlay under the Partial Wheel Load

2011 ◽  
Vol 189-193 ◽  
pp. 2001-2004
Author(s):  
Bin Yang ◽  
Qin Shou Huang ◽  
Ping Liang ◽  
Hua Xu
Keyword(s):  
Crack Propagation ◽  
Early Period ◽  
Propagation Path ◽  
Wheel Load ◽  
Propagation Length ◽  
Crack Propagation Path ◽  
Asphalt Overlay ◽  
Cement Concrete Pavement ◽  
Shear Type ◽  
Crack Propagation Length

Partial wheel load is one of the main causes that lead to shear-type reflective crack of asphalt overlay in the old cement concrete pavement. Based on the theory of fracture mechanics and finite element method, this paper focuses on the numerical simulation of the reflective crack propagation path in asphalt overlay under the partial wheel load. Calculation result and analysis show that reflective crack partially expands upwards at the side of wheel load under the effect of partial wheel load with a sequential increase of crack propagation length. As the crack propagation length increases, stress intensity factors grow rapidly in the early period, and then increase by degrees slowly and, in the later period, the amplitude grows increasingly. Stress and strain fields enhance as the reflective crack increases upwards and the crack propagation angle expands gradually with the increase of reflective crack propagation length.

scholarly journals Rate-Dependent Cohesive Models for Dynamic Mode I Interfacial Propagation and Failure of Unidirectional Composite Laminates

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 191
Author(s):  
Chenxu Zhang ◽  
Huifang Liu ◽  
Junchao Cao ◽  
Chao Zhang
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Numerical Models ◽  
Dynamic Mode ◽  
Interface Failure ◽  
Propagation Length ◽  
Zone Length ◽  
Rate Dependent ◽  
Cohesive Models ◽  
Crack Propagation Length

With the increasing application of composite materials in anti-impact structure, the development of reliable rate-dependent interlaminar constitutive model becomes necessary. This study aims to assess and evaluate the applicability of three types of rate-dependent cohesive models (logarithmic, exponential and power) in numerical delamination simulation, through comparison with dynamic test results of double cantilever beam (DCB) specimens made from T700/MTM28-1 composite laminate. Crack propagation length history profiles are extracted to calibrate the numerical models. Crack propagation contours and fracture toughness data are predicted, extracted and compared to investigate the difference of the three different rate-dependent cohesive models. The variation of cohesive zone length and force profiles with the implemented models is also investigated. The results suggest that the crack propagation length can be better predicted by logarithmic and power models. Although crack propagation length profiles are well predicted, the numerical calculated dynamic fracture toughness tends to be higher than that of experimental measured results. The three models also show differences in the prediction of maximum loading forces. The results of this work provide useful guidance for the development of more efficient cohesive models and more reliable interface failure simulation of impact problems.

A Predictive Rolling Contact Fatigue Crack Growth Model: Onset of Branching, Direction, and Growth—Role of Dry and Lubricated Conditions on Crack Patterns

2002 ◽  
Vol 124 (4) ◽  
pp. 680-688 ◽  
Author(s):  
M. C. Dubourg ◽  
V. Lamacq
Keyword(s):  
Fatigue Crack ◽  
Crack Propagation ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Interfacial Crack ◽  
Rolling Contact ◽  
Propagation Behavior ◽  
Branch Formation ◽  
Complex Crack ◽  
Crack Growth Model

Complex crack networks are initiated in rails under Rolling Contact Fatigue. This paper attempts to model the RCF crack propagation with a particular emphasis on the branching conditions and the parameters that play a role on them. The numerical tool proposed rests on the combination of the author’s RCF model, Hourlier and Pineau’s criterion for the branch prediction and experimental data and the corresponding models for fatigue crack extension that are derived from a Joint European project. Parametric studies on the influence of (i) residual stresses, (ii) both interfacial crack and wheel/rail contact frictional effects, (iii) neighboring crack are conducted to reach a better understanding of the RC crack propagation behavior and more particularly the branch conditions, i.e., the length of the primary crack prior to branch formation and the branch direction.

Study on Interfacial Crack Propagation and Fracture between Embedded Steel and HSHPC

2007 ◽  
Vol 348-349 ◽  
pp. 853-856
Author(s):  
Shan Suo Zheng ◽  
Lei Li ◽  
Guo Zhuan Deng ◽  
Liang Zhang
Keyword(s):  
Crack Propagation ◽  
High Performance ◽  
Fracture Process ◽  
Fracture Process Zone ◽  
High Performance Concrete ◽  
Process Zone ◽  
Interfacial Crack ◽  
High Strength ◽  
Interfacial Fracture ◽  
Softening Process

Steel reinforced high strength and high performance concrete (SRHSHPC) specimens were experimented to study the mechanical behaviors between steel and concrete interface. In experiment, interfacial bond softening process was observed, which can be explained in terms of damage along the interface, leading to progressive reduction of shear transfer capability between steel and high strength and high performance concrete (HSHPC). In this paper, bond softening process along the interface is considered in the analysis of crack-induced debonding. Interfacial bond-slip mechanism between steel and HSHPC is studied in detail based on fracture mechanics. With the help of acoustic emissions technology, the crack propagation in the interlayer was observed, thus the interfacial crack propagation and fracture model is set up. Under the assumption that the interlayer is weak concrete compared with concrete matrix, the stress field as well as displacement field around the crack tip is deduced. The characteristics of interfacial fracture process are discussed and a model for interfacial fracture process zone is built up. With this model, the size of fracture process zone can be derived. At last, the influence of the fracture process zone on interfacial fracture toughness is determined using critical fracture toughness. All these may contribute to improvement of theory for SRHSHPC composite structure.

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