Crack Length-Effective Stress Intensity Factor Relation in Notched Semi-Circular Specimens for Different Mode of Mixity

Hossam El-Din M. Sallam ； Amr A. Abd-Elhady

《Researches and Applications in Mechanical Engineering》 2卷4期 (2013/12) Pp. 120-124

並列摘要

The effects of crack inclination angle and crack length on the through-thickness mode I (KI), mode II (KII), and effective (k_eff=√k^2_I+k^2_(II)) stress intensity factors (SIFs) have been analyzed by using three dimensional finite element analysis (3D FEA). Edge crack in semi circular bend specimen (SCB) was utilized in this investigation. The mode of mixity (Me) values are equal to 1 (pure mode I), 0.75, 0.5, 0.25, and 0 (pure mode II). The crack length ratio, crack length/specimen radius (a/R), ranging from 0.1 to 0.7 by step equal to0.1 has been studied. In SCB specimen, the mode I geometry correction factor (YI) decreased by increasing the crack length for all values of mode of mixity, while, in the case of Me = 1 & 0.75 YI reached its minimum value at a/R ≈ 0.3 then YI increased by increasing the crack length. For all values of Me, Keff increased with the increasing crack length. However, the increment of increment in Keff for a/R ≤ 0.3 is lower than that for a/R ＞ 0.3.

並列關鍵字

Stress Intensity Factor ； Mixed Mode I/II ； SCB Specimen ； Three Dimension Finite Element