Mode I stress intensity factors of slanted cracks in plates

Colloquium of Advanced Mechanics 2016

Ismail, Al Emran^1 ; Mohd Ghazali, Mohd Zubir^2 ; Muhd Nor, Nik Hisyamudin^1

Faculty of Mechanical and Manufacturing Engineering, Universiti Tun Hussein Onn Malaysia, Johor, Batu Pahat

86400, Malaysia^1

Malaysia Marine and Heavy Engineering SDN. Bhd., Pasir Gudang, Johor

81700, Malaysia^2

关键词: Ansys finite elements;    Bending loading;    Cracked plate;    Domain integrals;    Literature survey;    Mode I stress intensity factor;    Normal cracks;    Stress intensity factor (SIF);   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/165/1/012008/pdf
DOI  :  10.1088/1757-899X/165/1/012008

来源: IOP

【 摘 要 】

This paper presents the roles of slanted cracks on the stress intensity factors (SIF) under mode I tension and bending loading. Based on the literature survey, lack of solution of SIFs of slanted cracks in plain strain plates are available. In this work, the cracks are modelled numerically using ANSYS finite element program. There are two important parameters such as slanted angles and relative crack length. SIFs at the crack tips are calculated according to domain integral method. Before the model is further used, it is validated with the existing model. It is found that the present model is well agreed with the previous model. According to finite element analysis, there are not only mode I SIFs produced but also mode II. As expected the SIFs increased as the relative crack length increased. However, when slanted angles are introduced (slightly higher than normal crack), the SIFs increased. Once the angles are further increased, the SIFs decreased gradually however they are still higher than the SIFs of normal cracks. For mode II SIFs, higher the slanted angels higher the SIFs. This is due to the fact that when the cracks are slanted, the cracked plates are not only failed due to mode I but a combination between both modes I and II.