scholarly journals Three-Dimensional Surface Crack Growth of Maraging Steel Spherical Pressure Shell

2021 ◽  
Vol 9 (11) ◽  
pp. 1280
Author(s):  
Yongmei Zhu ◽  
Rujun Li ◽  
Jiahao Yang
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Spherical Shell ◽  
Crack Growth ◽  
Maraging Steel ◽  
Surface Crack ◽  
Three Dimensional ◽  
Spherical Pressure ◽  
Surface Crack Growth ◽  
Dimensional Surface

This study focused on the three-dimensional surface crack growth of a spherical pressure shell. Eight maraging steel 18Ni (250) samples were fabricated and tested, and the fatigue crack growth rate curves were obtained. Considering the influence of plastic closure effect and sample thickness on crack growth, the fitting formula of fatigue crack growth only related to materials was obtained. Based on the three-dimensional crack closure theory and the strip yield model, a three-dimensional surface crack growth model of spherical pressure shell was established. By using a self-written program and FRANC3D, the three-dimensional surface crack growth simulations of the spherical shell were completed. The influence of the initial shape ratio and initial depth of the crack on the crack growth and the fatigue life of the spherical shell was analyzed.

Fatigue Crack Growth Life Prediction for Surface Crack Located in Stress Concentration Part Based on the Three-Dimensional Finite Element Method

2004 ◽  
Vol 126 (1) ◽  
pp. 160-166 ◽  
Author(s):  
Y. Yamashita ◽  
M. Shinozaki ◽  
Y. Ueda ◽  
K. Sakano
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Surface Crack ◽  
Three Dimensional ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Element Method

Fatigue crack growth prediction methods using three-dimensional finite element analyses were investigated to improve the predictability of part-through surface crack growth life. First, a direct analysis method of cyclic finite element analysis was adopted. Fatigue crack growth was predicted on a step by step basis from the Paris’ law using stress intensity factor range ΔK calculated by the three-dimensional finite element method. This method takes the procedure of cyclic operation of finite element analysis modeled with crack tip elements, crack growth increment calculation and remeshing of the finite element model. Second, a method based on the influence function method for the ΔK calculation directly using three-dimensional finite element method analysis result has been developed and applied. It was found that crack growth prediction based on the step by step finite element method and the method based on the influence function method showed good correlation with the experimental results if Paris’ law coefficient C, determined by CT specimen, was appropriately used for a semi-elliptical surface crack.

Fatigue crack growth of filament wound GRP pipes with a surface crack under cyclic internal pressure

2008 ◽  
Vol 43 (16) ◽  
pp. 5569-5573 ◽  
Author(s):  
Ahmet Samanci ◽  
Ahmet Avci ◽  
Necmettin Tarakcioglu ◽  
Ömer Sinan Şahin
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Internal Pressure ◽  
Crack Growth ◽  
Surface Crack ◽  
Filament Wound

Three-Dimensional Study of Fatigue Crack Growth in a Rotating Disc

2013 ◽  
Vol 3 (2) ◽  
pp. 45-62
Author(s):  
Eskandari Hadi ◽  
Nami Mohammad Rahim
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Crack Front ◽  
Numerical Technique ◽  
Three Dimensional ◽  
Crack Orientation ◽  
Rotating Disc ◽  
Mesh Density ◽  
Three Dimensional Finite Element

The problem of fatigue-crack-growth in a rotating disc at different crack orientation angles is studied by using an automated numerical technique, which calculates the stress intensity factors on the crack front through the three-dimensional finite element method. Paris law is used to develop the fatigue shape of initially semi-elliptical surface crack. Because of needs for the higher mesh density and accuracy near the crack, the sub-modeling technique is used in the analysis. The distribution of SIF’s along the crack front at each step of growth is studied and the effect of crack orientation on the rate of crack-growth is investigated. The calculated SIF’s are reasonable and could be used to predict the probable crack growth rates in fracture mechanics analysis and can help engineers to consider in their designing and to prevent any unwanted failure of such components.

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