An analytical method for predicting mode-I crack propagation process and resistance curve of rock and concrete materials

2019 ◽  
Vol 100 ◽  
pp. 328-341 ◽  
Author(s):  
Hong-Wei Wang ◽  
Zhi-Min Wu ◽  
Yan-Jie Wang ◽  
Rena C. Yu
Keyword(s):  
Crack Propagation ◽  
Analytical Method ◽  
Mode I ◽  
Mode I Crack ◽  
Resistance Curve ◽  
Propagation Process ◽  
Crack Propagation Process ◽  
Concrete Materials

Experimental and Numerical Study on Mode I-II Crack Propagation for Small Size Specimens of Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 908-912
Author(s):  
Wei Dong ◽  
Hua Nan He ◽  
Zhi Min Wu
Keyword(s):  
Crack Propagation ◽  
Numerical Study ◽  
Initial Crack ◽  
Mode I ◽  
Propagation Process ◽  
Crack Propagation Process ◽  
Series Of Experiments ◽  
The Difference ◽  
The One ◽  
Good Agreement

The crack criterion is important to determine the crack propagation for mode I-II fracture in concrete. The paper aims to obtain the initial crack criterion of four-point shearing beams experimentally, which can be applied in the numerical simulation for crack propagation process. A series of experiments of four-point shearing notched beams of concrete with five different heights of 80mm, 100mm, 120mm, 140mm and 160mm respectively were carried out to measure the initial loading Pini. The different combinations of KiniI and KiniII corresponding to Pini were obtained according to different positions of pre-cracks in the specimens, and the initial crack criterion was fitted using the combinations of KiniI and KiniII. With the assumption that the crack will extend when the difference between the stress intensity factor at the crack tip caused by the load P and the one caused by the cohesive force attained the above KiniI- KiniII curve, the criterion was applied to simulate the crack propagation process in the paper. It was found that the numerical analysis showed a good agreement with the experimental results and that the size effect is not remarkable for the KiniI-KiniII curves of different heights specimens in the test.

Numerical Simulation on the Compound Crack Propagation Process in Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1139-1142
Author(s):  
Pei Xiu Xia ◽  
Guang Ping Zou ◽  
Li Qiang Tang
Keyword(s):  
Numerical Simulation ◽  
Crack Propagation ◽  
Failure Process ◽  
Peak Load ◽  
Propagation Path ◽  
Propagation Process ◽  
Load Increase ◽  
Crack Propagation Process ◽  
Crack Initiation Angle ◽  
Concrete Materials

In this paper, numerical simulation on the failure process of the mixed mode crack about the concrete is carried out. The results show that the crack initiation angle and the peak load increase as the distance between the preexisting crack and the midline of the beam is greater, the distance is constant, the longer the length of the preexisting crack is, the bigger the peak load is. Due to the heterogeneity of concrete materials, the crack propagation path is tortuous, and tensile stress is the major driving force.

scholarly journals Mode I Crack Propagation Experimental Analysis of Adhesive Bonded Joints Comprising Glass Fibre Composite Material under Impact and Constant Amplitude Fatigue Loading

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4380
Author(s):  
Alirio Andres Bautista Villamil ◽  
Juan Pablo Casas Rodriguez ◽  
Alicia Porras Holguin ◽  
Maribel Silva Barrera
Keyword(s):  
Crack Propagation ◽  
Structural Integrity ◽  
Crack Propagation Rate ◽  
Fatigue Loading ◽  
Propagation Rate ◽  
Operating Conditions ◽  
Impact Testing ◽  
Mode I ◽  
Mode I Crack ◽  
Constant Amplitude

The T-90 Calima is a low-wing monoplane aircraft. Its structure is mainly composed of different components of composite materials, which are mainly bonded by using adhesive joints of different thicknesses. The T-90 Calima is a trainer aircraft; thus, adverse operating conditions such as hard landings, which cause impact loads, may affect the structural integrity of aircrafts. As a result, in this study, the mode I crack propagation rate of a typical adhesive joint of the aircraft is estimated under impact and constant amplitude fatigue loading. To this end, effects of adhesive thickness on the mechanical performance of the joint under quasistatic loading conditions, impact and constant amplitude fatigue in double cantilever beam (DCB) specimens are experimentally investigated. Cyclic impact is induced using a drop-weight impact testing machine to obtain the crack propagation rate (da/dN) as a function of the maximum strain energy release rate (GImax) diagram; likewise, this diagram is also obtained under constant amplitude fatigue, and both diagrams are compared to determine the effect of each type of loading on the structural integrity of the joint. Results reveal that the crack propagation rate under impact fatigue is three orders of magnitude greater than that under constant amplitude fatigue.

The Comparison of Self-Compacting Rock-Filled Concrete with Large-Size Natural and Recycled Aggregate

2014 ◽  
Vol 513-517 ◽  
pp. 20-23
Author(s):  
Hai Chao Wang ◽  
Xue Hua Wang ◽  
Xue Hui An
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Fracture Energy ◽  
Fracture Mechanism ◽  
Recycled Aggregate ◽  
Propagation Process ◽  
Fracture Characteristics ◽  
Three Point Bending ◽  
Large Size ◽  
Crack Propagation Process

The different fracture characteristics of self-compacting rock-filled concrete with large-size natural and recycled aggregate are analyzed by three-point bending experiment. According to the analysis of the crack propagation process, the fracture mechanism differences of self-compacting rock-filled concrete with large-size natural and recycled aggregate are discussed. The further analysis of the differences of fracture toughness, fracture energy, and are gain

1928 Evaluation of Thermal Fatigue Micro-crack Propagation Process in Flip Chip Interconnects by Synchrotron Radiation X-ray Micro-tomography

2007 ◽  
Vol 2007.7 (0) ◽  
pp. 221-222
Author(s):  
Hiroyuki Tsuritani ◽  
Toshihiko Sayama ◽  
Yoshiyuki Okamoto ◽  
Takeshi Takayanagi ◽  
Kentaro Uesugi ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Crack Propagation ◽  
Thermal Fatigue ◽  
Flip Chip ◽  
Propagation Process ◽  
X Ray ◽  
Crack Propagation Process ◽  
Micro Tomography
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