Analysis of a Semi-Elliptical Crack on a Surface of a Piezoelectric Patch Attached on a Beam by Finite Element Method

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ประเสริฐ อังกาบ
เอกอุ ธรรมกรบัญญัติ


 This research intends to investigate the effects of some parameters to the stress intensity factor of a semi-elliptical surface crack under the open mode condition. The model has been simplified from cracking failures which occurred at piezoelectric patches embedded on an actuator arm in hard disk drive. Thus a cantilever beam with a piezoelectric patch subject to bending moment at its free end is chosen. Stress intensity factors at crack fronts are then calculated by a commercial finite element software, ANSYS. From the numerical results, crack size ratio and crack position have significant effects to the stress intensity factor. When the crack size ratio is increased (the crack depth is increased until equal to the half crack length) the maximum KI will also be increased. For crack position, more closer to the edge of a piezoelectric patch the KI will be higher. In the other hand, the piezoelectric patch position is not affect to KI.



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