A Research about the Fracture Analysis on Compact Tension Specimen Applied to Motor Core Composed of Silicon Steel
Abstract
Background/Objectives:Because silicon steel as an important element for motor core is related to the motor efficiency, this study aims at analyzing it before making a core with silicon steel.
Methods/Statistical analysis: In this study, CT specimensconformedwith ASTM(E647) and ISO Standards were designed. The finite element analyseswere carried out. In order to examine the reaction force to the displacement of specimen, the top of specimen was pulled by1 mm/min on Z-axis direction and the bottom of specimen was fixed. With the designed CT specimens, thephenomena of buckling modes are analyzed with the modal analysis technique.
Findings: As silicon steel is the rolled steel sheet, its rolling and transverse directions must be checked.It is necessary to examine the different fracture behavior of CT specimen by section. Before final fracture, It first has a buckling phenomenon and goes through the period of plasticity. The specimen stacked in more than two layers was made in order to investigate the material property in the direction of its thickness and estimate its stress and deformation. The specimen was divided into multiple sections in it and designed its layers in the direction of thickness. Each section was constructed with hexahedrons to create the dense mesh structure. A constraint condition was given: the top and bottom of the specimen were constrained by pins while given a rotational DOFto move in Z-axis direction. The speed of forced displacement was set to 1 mm/min and the interference between the elements was minimized. And the mesh was differently structured for each section of the specimen to enhance the efficiency of the analysis.
Improvements/Applications: This result on theCTspecimen of silicon steelcan be appliedfordesigning the motor core. The efficiency of analysis can be improved by utilizing the analysis technique.
Keywords: Motor core, Silicon steel, Compact tension specimen,Finiteelement analysis, Buckling, Fracture behavior characteristic
