STRESS INTENSITY FACTOR CALCULATION FOR SURFACE CRACK IN A FAMILY OF THIN AND THICK ROTATING DISKS USING TWO DIMENSIONAL WEIGHT FUNCTIONS

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GHAJAR RAHMATOLLAH; DAVOUD ABADI MEYSAM; SAEIDI GOOGARCHIN HAMED

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Journal: Modares Mechanical Engineering Year:2016 | Volume:15 | Issue:12 Page(s): 84-94

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Information Journal Paper

Title

STRESS INTENSITY FACTOR CALCULATION FOR SURFACE CRACK IN A FAMILY OF THIN AND THICK ROTATING DISKS USING TWO DIMENSIONAL WEIGHT FUNCTIONS

Author(s)

GHAJAR RAHMATOLLAH | DAVOUD ABADI MEYSAM | SAEIDI GOOGARCHIN HAMED | Issue Writer Certificate

Keywords

ROTATING DISKQ2

TWO-DIMENSIONAL WEIGHT FUNCTIONQ2

STRESS INTENSITY FACTORQ2

SURFACE CRACKQ2

Abstract

A family of ROTATING DISKs used in Iranian turbine and compressor industry is investigated. Mechanical and thermal loads due to working condition leads to the crack initiation in the inner surface of the disk. The aim of this paper is the development of the TWO-DIMENSIONAL WEIGHT FUNCTION for the ROTATING DISKs containing semi-elliptical longitudinal cracks. The general form of the TWO-DIMENSIONAL WEIGHT FUNCTION is related to the proposed weight functions for embedded cracked domain in literature. In order to determine the unknown coefficient of the weight function, the reference STRESS INTENSITY FACTORs for cracked geometry subjected to reference loads are calculated. The analysis indicated that the results are independent of the number of terms in proposed weight function expansion. Extracting the weight function for disks from 90 to 420 mm thickness enables prediction of STRESS INTENSITY FACTOR for cracks in the structure subjected to arbitrary loading. The STRESS INTENSITY FACTOR for each point on the crack front subjected to one or two dimensional loads are calculated using the derived weight function. The results reveal that increasing the height to thickness ratio in ROTATING DISKs leads to the increase of the STRESS INTENSITY FACTOR for high depth ratio crack ones. Results show that the configuration of the disk sections affects the STRESS INTENSITY FACTORs of the same aspect ratio cracks in the structures. Comparison of the results obtained from the weight function method and those obtained with FEM are in good agreement.

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APA: Copy

GHAJAR, RAHMATOLLAH, DAVOUD ABADI, MEYSAM, & SAEIDI GOOGARCHIN, HAMED. (2016). STRESS INTENSITY FACTOR CALCULATION FOR SURFACE CRACK IN A FAMILY OF THIN AND THICK ROTATING DISKS USING TWO DIMENSIONAL WEIGHT FUNCTIONS. MODARES MECHANICAL ENGINEERING, 15(12), 84-94. SID. https://sid.ir/paper/179910/en

Vancouver: Copy

GHAJAR RAHMATOLLAH, DAVOUD ABADI MEYSAM, SAEIDI GOOGARCHIN HAMED. STRESS INTENSITY FACTOR CALCULATION FOR SURFACE CRACK IN A FAMILY OF THIN AND THICK ROTATING DISKS USING TWO DIMENSIONAL WEIGHT FUNCTIONS. MODARES MECHANICAL ENGINEERING[Internet]. 2016;15(12):84-94. Available from: https://sid.ir/paper/179910/en

IEEE: Copy

RAHMATOLLAH GHAJAR, MEYSAM DAVOUD ABADI, and HAMED SAEIDI GOOGARCHIN, “STRESS INTENSITY FACTOR CALCULATION FOR SURFACE CRACK IN A FAMILY OF THIN AND THICK ROTATING DISKS USING TWO DIMENSIONAL WEIGHT FUNCTIONS,” MODARES MECHANICAL ENGINEERING, vol. 15, no. 12, pp. 84–94, 2016, [Online]. Available: https://sid.ir/paper/179910/en

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