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- W2183614714 abstract "Multiple cracks emanating from threaded fasteners and rectangular plates represent one of the most common fracture sources in aircraft structures and automobiles. Due to complexities in analysis of multiple cracks, many researchers have studied the damage tolerance analysis of single crack in rectangular plate, notched and un-notched round bar in which the effect of crack interaction has been neglected. This paper presents the stress intensity factor and interaction behavior of multiple cracks which are located in opposite direction in a rectangular bar subjected to far filed tension loading. Two surface cracks of same dimensions were introduced in the opposite sides of a rectangular bar. The crack depth ratio (a/t) ranging between 0.1 and 0.4 was considered for different crack aspect ratios (a/c = 0.6 and 1.0). The crack front region was meshed with iso-parametric singular elements to determine the SIF values accurately. The SIF values of single and multiple cracks are compared to understand the interaction behaviour of opposite cracks. Higher SIF values are observed at the crack surface region (S/S0 = +1, -1) for a semi circular crack (a/c=1.0) at lower crack depths ((a/t) < 0.2 whereas, the SIF values are higher at the crack middle region (S/S0 = 0) for a semi elliptic crack (a/c = 0.6) irrespective of the crack depth ratios. It is observed that, SIF values are not symmetric with crack middle region at higher depths due to additional effect of mode II and mode III fracture. It is also noted that the interaction effect of the growing cracks is more significant at higher crack depths. The effect is more significant at the crack middle region compared to crack surface region. The SIF values at the middle region of an elliptic crack are higher than circular crack irrespective of crack depth ratios considered in the present study. Index Terms— multiple cracks, stress intensity factor, Iso-parametric element, interaction effect, crack depth ratio, crack aspect ratio, mixed mode fracture —————————— ——————————" @default.
- W2183614714 created "2016-06-24" @default.
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- W2183614714 date "2013-01-01" @default.
- W2183614714 modified "2023-09-27" @default.
- W2183614714 title "Estimation of Mixed mode Stress Intensity Factor and Interaction Behaviour of Surface Cracks in Rectangular Bar" @default.
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