A novel mixed-mode brittle fracture criterion for crack growth path prediction under static and fatigue loading

2015 ◽  
Vol 38 (11) ◽  
pp. 1372-1382 ◽  
Author(s):  
S. H. Sajjadi ◽  
M. J. Ostad Ahmad Ghorabi ◽  
D. Salimi-Majd
Keyword(s):  
Brittle Fracture ◽  
Crack Growth ◽  
Mixed Mode ◽  
Fracture Criterion ◽  
Fatigue Loading ◽  
Growth Path ◽  
Path Prediction ◽  
Crack Growth Path ◽  
Brittle Fracture Criterion

A general mixed-mode brittle fracture criterion for cracked materials

2006 ◽  
Vol 73 (9) ◽  
pp. 1249-1263 ◽  
Author(s):  
Jun Chang ◽  
Jin-quan Xu ◽  
Yoshiharu Mutoh
Keyword(s):  
Brittle Fracture ◽  
Mixed Mode ◽  
Fracture Criterion ◽  
Brittle Fracture Criterion

Morphology Analysis of Mixed Mode Fatigue Crack Growth in a Low Alloy Steel

2013 ◽  
Vol 787 ◽  
pp. 745-749
Author(s):  
Hui Fang Li ◽  
Xiao Ju Sun ◽  
Lan Qing Tang ◽  
Cai Fu Qian
Keyword(s):  
Fatigue Crack ◽  
Fracture Surface ◽  
Crack Growth ◽  
Alloy Steel ◽  
Mixed Mode ◽  
Low Alloy Steel ◽  
Growth Path ◽  
Fatigue Fracture Surface ◽  
Final Fracture ◽  
Crack Growth Path

In this paper, I+II mixed mode fatigue crack propagation in a low alloy steel 16MnDR was experimentally investigated. Morphologies of crack growth path and fracture surface are analyzed. It is found that upon initiation from the inclined pre-crack, the newly formed crack grows in a direction to be perpendicular to the applied load, making crack mode transformation from I+II mixed mode to mode I. The crack growth is transgranular and no clear branches are presented. Striations and dimples are found on the fatigue fracture surface and the final fracture surface, respectively, showing that the material is ductile in nature.

scholarly journals Numerical Analysis of Fatigue Crack Growth Path and Life Predictions for Linear Elastic Material

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3380
Author(s):  
Abdulnaser M. Alshoaibi ◽  
Yahya Ali Fageehi
Keyword(s):  
Fatigue Crack ◽  
Fatigue Life ◽  
Crack Propagation ◽  
Crack Growth ◽  
Mixed Mode ◽  
Compact Tension ◽  
Compact Tension Specimen ◽  
Growth Path ◽  
Linear Elastic ◽  
Crack Growth Path

The main objective of this work was to present a numerical modelling of crack growth path in linear elastic materials under mixed-mode loadings, as well as to study the effect of presence of a hole on fatigue crack propagation and fatigue life in a modified compact tension specimen under constant amplitude loading condition. The ANSYS Mechanical APDL 19.2 is implemented for accurate prediction of the crack propagation paths and the associated fatigue life under constant amplitude loading conditions using a new feature in ANSYS which is the smart crack growth technique. The Paris law model has been employed for the evaluation of the mixed-mode fatigue life for the modified compact tension specimen (MCTS) with different configuration of MCTS under the linear elastic fracture mechanics (LEFM) assumption. The approach involves accurate evaluation of stress intensity factors (SIFs), path of crack growth and a fatigue life evaluation through an incremental crack extension analysis. Fatigue crack growth results indicate that the fatigue crack has always been attracted to the hole, so either it can only curve its path and propagate towards the hole, or it can only float from the hole and grow further once the hole has been lost. In terms of trajectories of crack propagation under mixed-mode load conditions, the results of this study are validated with several crack propagation experiments published in literature showing the similar observations. Accurate results of the predicted fatigue life were achieved compared to the two-dimensional data performed by other researchers.

Crack Growth Path Prediction Based on Surface Roughness Evolution

2017 ◽  
Author(s):  
J. Sola ◽  
R. Kelton ◽  
H. Huang ◽  
E. Meletis
Keyword(s):  
Surface Roughness ◽  
Crack Growth ◽  
Growth Path ◽  
Path Prediction ◽  
Crack Growth Path ◽  
Surface Roughness Evolution

Crack growth simulation in heterogeneous material by S-FEM and comparison with experiments

2015 ◽  
Author(s):  
Masanori Kikuchi ◽  
Yoshitaka Wada ◽  
Yulong Li
Keyword(s):  
Aluminum Alloy ◽  
Crack Growth ◽  
Mixed Mode ◽  
Heterogeneous Material ◽  
Initial Crack ◽  
Growth Path ◽  
Growth Simulation ◽  
Crack Growth Simulation ◽  
Cfrp Plate ◽  
Crack Growth Path

Fully automatic fatigue crack growth simulation system is developed using S-version FEM (SFEM). This system is extended to fracture in heterogeneous material. In the heterogeneous material, crack tip stress field becomes mixed mode condition, and crack growth path is affected by inhomogeneous materials and mixed mode conditions. Stress Intensity Factors (SIF) in mixed mode condition are evaluated using Virtual Crack Closure Method (VCCM). Criteria for crack growth amount and crack growth path are used based on these SIFs, and growing crack configurations are obtained. Three crack growth problems are simulated. One is crack growth in bi-materila made of CFRP plate and Aluminum alloy. Initial crack is located in CFRP plate, and grows toward Aluminum alloy. Crack growing direction changes and results are compared with experimental one. Second problem is crack growth in bimaterial made of PMMA and Aluminum alloy. Initial crack is located in PMMA plate and parallel to phase boundary. By cahnging loading conditions, several cases are simulated and compared with experimental ones. In the experiment, crack grows into pahse boundary and grow along it. This case is simulated precisely, and the effect of pahse boundary is discussed. Last case is Stress Corrosion Cracking (SCC) at Hot-Leg Safe-End of Pressurized Water Rreactor. This location is made of many kinds of steels by welding. In some steel, SCC does not occur and in other steel, SCC is accelerated. As a result, small surface crack grows in complicated manner.

Crack Growth Path Prediction Based on Surface Roughness Evolution

2017 ◽  
Author(s):  
J. Sola ◽  
R. Kelton ◽  
H. Huang ◽  
E. Meletis
Keyword(s):  
Surface Roughness ◽  
Crack Growth ◽  
Growth Path ◽  
Path Prediction ◽  
Crack Growth Path ◽  
Surface Roughness Evolution

Development of a Numerical Prediction Method for Crack Growth Path Under Mixed-mode Static Load

2000 ◽  
Vol 2000.3 (0) ◽  
pp. 59-60
Author(s):  
Toshihisa NISHIOKA ◽  
Takehiro FUJIMOTO ◽  
Masanori HASHIMOTO ◽  
Hiroki NISHIDA
Keyword(s):  
Crack Growth ◽  
Mixed Mode ◽  
Static Load ◽  
Prediction Method ◽  
Numerical Prediction ◽  
Growth Path ◽  
Crack Growth Path
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