scholarly journals Fracture Parameters and Cracking Propagation of Cold Recycled Mixture Considering Material Heterogeneity Based on Extended Finite Element Method

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 1993
Author(s):  
Lei Gao ◽  
Xingkuan Deng ◽  
Ye Zhang ◽  
Xue Ji ◽  
Qiang Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mixed Mode ◽  
Extended Finite Element Method ◽  
Test Method ◽  
Extended Finite Element ◽  
Cracking Resistance ◽  
Fracture Parameters ◽  
Notch Length ◽  
Element Method

Cold recycled mixture (CRM) has been widely used around the world mainly because of its good ability to resist reflection cracking. In this study, mixed-mode cracking tests were carried out by the designed rotary test device to evaluate the cracking resistance of CRM. Through the finite element method, the heterogeneous model of CRM based on its meso-structure was established. The cracking process of CRM was simulated using the extended finite element method, and the influence of different notch lengths on its anti-cracking performance was studied. The results show that the mixed-mode fracture test method can effectively evaluate the cracking resistance of CRM by the proposed fracture parameters. The virtual tests under three of five kinds of mixed-cracking modes have good simulation to capture the cracking behavior of CRM. The effect of notch length on the initial crack angle and the crack propagation process of the CRM is mainly related to the distribution characteristics of its meso-structure. With the increase of the proportion of Mode II cracking, the crack development path gradually deviates, and the failure elements gradually increase. At any mixed-mode level, there is an obvious linear relationship between the peak load, fracture energy, and the notch length.

scholarly journals Fracture analysis for materials by a stable generalized/extended finite element method

2021 ◽  
Vol 37 ◽  
pp. 513-521
Author(s):  
H G Jia ◽  
Y M Zhao ◽  
Y F Nie ◽  
S Q Li
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Extended Finite Element Method ◽  
Fracture Analysis ◽  
System Matrix ◽  
Intensity Factors ◽  
Extended Finite Element ◽  
Fracture Parameters ◽  
Good Agreement ◽  
Element Method

ABSTRACT In this paper, a method is proposed for extracting fracture parameters in isotropic material cracking via a stable generalized/extended finite element method. The numerical results of the stress intensity factors and scaled condition number of the system matrix are presented and compared with different enrichment schemes or those reported in related references. The good agreement and convergence of the results obtained by the developed method with those obtained by other solutions or enrichment schemes proves the applicability of the proposed approach and confirms its capability of efficiently extracting fracture parameters in isotropic materials.

An Investigation of I-II Mixed Mode Structures With Stop Hole Technique Based on Extended Finite Element Method

2017 ◽  
Author(s):  
Xin-Ting Miao ◽  
Chang-Yu Zhou ◽  
Xiao-Hua He
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crack Initiation ◽  
Mixed Mode ◽  
Extended Finite Element Method ◽  
Mode I ◽  
Mode Ii ◽  
Extended Finite Element ◽  
The Difference ◽  
Element Method

Extended finite element method (XFEM) is adopted in this paper to study crack growth path and loading capability for modified compact tension shear (CTS) specimen with stop hole ahead of crack tip. Elliptical stop holes with different values of b/h are considered, where b and h are radii of the ellipse parallel and vertical to the crack. When b/h is 1 (circle stop hole), the locations of crack initiation turn clockwise gradually as the loading angle β (angle between the loading direction and the crack plane) decreases. When b/h is not equal to 1 (elliptical stop hole), the locations of crack initiation are all near the long axis end point of the ellipse no matter what the mode mixity is. Curves of load-COD and ultimate loads are presented for different mixed mode loadings, it can be obtained that for mode I dominant crack loading capability increases, though for mode II dominant crack loading capability decreases due to the stop hole technique. For mode I dominant crack the loading capability increases as the value of b/h decreases, and for mode II dominant crack the trend of loading capability with b/h changes gradually oppositely. The difference of crack initiation locations for different stop holes is due to the stress concentration considering both curvatures and the loading modes. And the difference of loading capability for specimens with stop holes under different mixed mode loadings is due to the shear action due to the discrepancy between the positive and negative stresses. Therefore, stop hole technique can be used to change the crack initiation location in order to avoid the important component and improve the loading capability by choosing an appropriate hole shape.

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