crack bifurcation
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2021 ◽  
Author(s):  
Mufei Wang ◽  
Zhiqiang Li

Abstract Crack initiation and propagation is a long-standing difficulty in solid mechanics, especially for elastic-brittle material. To explore the damage and crack propagation behavior of architectural glass under different type of loads, the element deletion (ED), discontinuous Galerkin peridynamics (DG-PD) and meshless peridynamics (M-PD) methods are studied. Taking the architecture glass as an example, the crack propagation behavior under the bullet impact and explosion load are studied. The JH-2 material model is used in the ED method, and the maximum principal stress and maximum principal strain failure criteria are applied at the same time. In the DG-PD method, it conducts a node separation operation and imposes the criterion of the critical energy release rate. The M-PD method adopts a self-programmed particle discretization method and imposes a criterion of critical elongation. Three methods can simulate the crack growth behavior of glass material, but the PD method has great advantages in detail, such as crack bifurcation and penetration. For low-velocity bullets, the failure behavior of glass all shows cross-shaped cracks in different methods. The splashing of elements or particles appears in the two PD methods, but the particle splashing of the M-PD method is more obvious, and the DG-PD method captures the crack bifurcation effect better. For the failure behavior of glass under explosive loading, the PD method is obviously better than the ED method in terms of modal appearance. However, in the mechanical behavior of specific elements, the two methods have a high degree of agreement.


2020 ◽  
Vol 110 ◽  
pp. 102790 ◽  
Author(s):  
Majid R. Ayatollahi ◽  
Robab Bahadori ◽  
Bahador Bahrami ◽  
M. Yazid Yahya ◽  
Filippo Berto
Keyword(s):  

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-7
Author(s):  
Huafu Qiu ◽  
Fushun Zhang ◽  
Lang Liu ◽  
Dongzhuang Hou ◽  
Bingbing Tu

Tailing cement filling is an important development direction in mine filling, as it is a green and environmentally friendly method for efficiently treating solid waste in mines. Adding a certain amount of waste rock can effectively improve the backfill strength and better meet the filling strength requirements. To address the use of waste rock tailings in cemented filling materials, a uniaxial compression test was carried out on backfills with different cement/sand ratios and waste rock contents, and the influence of the cement/sand ratio and waste rock content on the strength of the backfill was studied. This study found that when the waste rock content is certain, the strength of the backfill increases with the increase in the cement/sand ratio, and the increase in strength slows with the increase in the cement/sand ratio until the strength of the backfill reaches a limit and no longer increases. When the cement/sand ratio is constant, the strength of the backfill first increases and then decreases as the waste rock content increases. When the cement content is constant, the addition of a certain amount of waste rock reduces the specific surface area of the solid materials in the backfill, increases the amount of cement per unit area, and improves the strength of the backfill. When the waste rock content is too high, due to the large particle size of the waste rock, the tailings cannot completely wrap around the waste rock, resulting in a weakening of the cement in the backfill, which reduces the strength of the backfill. This study found that the waste rock content and the cement/sand ratio in the backfill have a significant impact on backfill damage. The damage is mainly caused by insufficient cement strength. The presence of waste rock will change the original direction of crack propagation, resulting in more crack bifurcation, and the form of the destruction surface on the backfill is complicated and diverse.


2020 ◽  
Vol 190 ◽  
pp. 108014 ◽  
Author(s):  
Xinchen Ni ◽  
Carolina Furtado ◽  
Nathan K. Fritz ◽  
Reed Kopp ◽  
Pedro P. Camanho ◽  
...  

Author(s):  
Xinyu Yan ◽  
Shouren Wang ◽  
Daosheng Wen ◽  
Gaoqi Wang ◽  
Wentao Liu

Tungsten carbide composites were prepared by cold-pressing and hot-pressing sintering; fracture toughness and bending strength of the specimens were tested. The microstructures of HfC/WC/Co composites were observed with the SEM. The mathematical models were established to investigate the relationship between stress intensity factors of crack straight-through, crack deflection, and crack bifurcation with crack length, based on the crack propagation energy release rate. The simulation software ABAQUS was used to verify the four crack propagation methods of crack straight-through, crack deflection, crack bifurcation and crack pinning. The simulation results show that adding appropriate amount of HfC can effectively improve the fracture toughness and bending strength of the composites. The homogeneous distribution of HfC and Co in the matrix has a significant effect on the improvement of the strength and toughness of the composites, and the improvement mechanism is to disperse or transfer the stress at the crack tip to HfC by crack deflection, crack bifurcation, crack pinning, transcrystalline fracture, etc. As a result, the stress concentration at the crack tip in the matrix is reduced, and the toughness of the composites is improved.


2019 ◽  
Vol 28 ◽  
pp. 2633366X1989062 ◽  
Author(s):  
Jianying Hao ◽  
Baolin Mu ◽  
Yunfeng Gao ◽  
Pinbo Bai ◽  
Yuming Tian ◽  
...  

Main crystal phases of low-density ceramic proppants prepared by bauxite and feldspar are granular corundum and whisker-shaped mullite. Mullite whiskers are interlocked with one another and piled up inside the pores. High aspect ratio of mullite whiskers inside the pores can greatly enhance the fracture toughness. The dominant toughening mechanism for the proppants is attributed to crack bifurcation and deflection and pulling out and bridging effect of mullite whiskers.


2017 ◽  
Vol 4 (5) ◽  
pp. 16-00705-16-00705 ◽  
Author(s):  
Yoshitomo OBA ◽  
Kyohei TAKEO ◽  
Wataru NAKAO ◽  
Shingo OZAKI

2016 ◽  
Vol 28 (33) ◽  
pp. 7043-7043 ◽  
Author(s):  
Hui Guo ◽  
Nicolas Sanson ◽  
Dominique Hourdet ◽  
Alba Marcellan
Keyword(s):  

2016 ◽  
Vol 28 (28) ◽  
pp. 5857-5864 ◽  
Author(s):  
Hui Guo ◽  
Nicolas Sanson ◽  
Dominique Hourdet ◽  
Alba Marcellan
Keyword(s):  

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