Complete Block Shear Fracture Failure Finite Element Analysis
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TECHNICAL ARTICLE–PEER-REVIEWED
Complete Block Shear Fracture Failure Finite Element Analysis Kazeem Kayode Adewole . Gerushom Abaho
Submitted: 17 May 2020 Ó ASM International 2020
Abstract The experimental and finite element (FE) analyses of the block shear fracture failure in the published literature are limited to the analysis of the fracture on the surface of the gusset plates and connected members without the analysis of the through-thickness fracture in block shear fracture failure. This paper presents the FE analysis of the complete block shear fracture failure covering the analyses of the block shear surface and through-thickness fracture failure. This study reveals the following: The block shear fracture initiation occurs at the tensile plane midthickness and not on the tensile plane surface reported in the published literature. The tension plane through-thickness fracture propagation involves mid-thickness-tosurface fracture propagation and not the surface-to-midthickness fracture propagation reported in the published literature. The pure shear fracture that is parallel to the tensile loading direction exhibits a surface-to-mid-thickness fracture sequence while the shear lip fracture that is inclined to the tensile loading direction exhibits a midthickness-to-surface fracture propagation. This paper thus identifies the accurate fracture initiation location and through-thickness fracture propagation sequence in block shear fracture essential for the accurate and complete analysis of the block shear fracture not hitherto presented in any published literature. Keywords Block shear failure Finite element Pure shear fracture Shear lip fracture Through-thickness fracture
K. K. Adewole (&) G. Abaho Department of Civil, Environmental and Geomatics Engineering, University of Rwanda, Kigali, Rwanda e-mail: [email protected]
Introduction Butt, lap and beam-to-column shear joints are structural shear joints/connections commonly found in civil, aerospace, marine, and other mechanical structures [1]. The need for the analysis of the failure of connections has become very important because the failures of connections have led to the collapse of the whole building structures [2] and the collapse of the Minneapolis, Minnesota I-30 35 W bridge [3]. Specifically, there is the need for the analysis of the failure of shear connection as the failure of the Minneapolis, Minnesota I-30 35 W bridge resulted from the fracture of shear connection gusset plates. In particular, there is a need for the analysis of the failure of the block shear fracture as the block shear fracture failure has been observed in service [4]. The block shear fracture failure which is a combination of the fracture of the tensile and shear planes is one of the failure modes exhibited by bolted shear connection gusset plates and connected members in civil, aerospace, marine and other mechanical structures [4–7]. Macrofractography which involves examining the fracture surfaces with the unaided human eye (visual examination) or with a low-magn
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