CALCULATION OF STATIC AND DYNAMIC STRESS INTENSITY FACTORS IN ORTHOTROPIC FUNCTIONALLY GRADED MATERIALS USING DISPLACEMENT CORRELATION TECHNIQUE

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GHAJAR RAHMATOLLAH; VARAVI MOHAMMAD REZA; PEYMAN SAFA

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Journal: Modares Mechanical Engineering Year:2016 | Volume:16 | Issue:3 Page(s): 79-86

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Title

CALCULATION OF STATIC AND DYNAMIC STRESS INTENSITY FACTORS IN ORTHOTROPIC FUNCTIONALLY GRADED MATERIALS USING DISPLACEMENT CORRELATION TECHNIQUE

Author(s)

GHAJAR RAHMATOLLAH | VARAVI MOHAMMAD REZA | PEYMAN SAFA | Issue Writer Certificate

Keywords

STRESS INTENSITY FACTORSQ2

FUNCTIONALLY GRADED MATERIALSQ2

DISPLACEMENT CORRELATION TECHNIQUEQ1

NON- HOMOGENEITY PARAMETERQ1

FINITE ELEMENT METHODQ2

Abstract

Static and dynamic STRESS INTENSITY FACTORS are important parameters in the fracture behavior of the cracked bodies. In the present study the DISPLACEMENT CORRELATION TECHNIQUE (DCT) is presented to calculate static and dynamic STRESS INTENSITY FACTORS of FUNCTIONALLY GRADED MATERIALS (FGMs). The displacement field is obtained using FINITE ELEMENT METHOD (FEM) and ABAQUS software. To consider the variation of material properties, a subroutine is prepared in the UMAT subroutine of the software. Eight-node singularity elements are used in the FEM. As ABAQUS software is not able to calculate STRESS INTENSITY FACTORS of FGMs, a MATLAB code is developed to obtain these factors. By analyzing an example under dynamic load, dynamic fracture behavior of orthotropic FGMs and effect of nonhomogeneity parameter are investigated for two cases of material properties variation directions which are perpendicular to each other. To verify presented method, a center crack in a plate of homogeneous and FGM materials are analyzed under static and dynamic loads, the results are compared with data from the literature. The results show that, if the material properties vary parallel to the crack direction, the mode I dynamic stress intensity factor at the crack tip located in the stiffer part increases with increasing of non-homogeneity parameter, while for variation in the normal direction to the crack, this factor first increases and then decreases.

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APA: Copy

GHAJAR, RAHMATOLLAH, VARAVI, MOHAMMAD REZA, & PEYMAN, SAFA. (2016). CALCULATION OF STATIC AND DYNAMIC STRESS INTENSITY FACTORS IN ORTHOTROPIC FUNCTIONALLY GRADED MATERIALS USING DISPLACEMENT CORRELATION TECHNIQUE. MODARES MECHANICAL ENGINEERING, 16(3), 79-86. SID. https://sid.ir/paper/178506/en

Vancouver: Copy

GHAJAR RAHMATOLLAH, VARAVI MOHAMMAD REZA, PEYMAN SAFA. CALCULATION OF STATIC AND DYNAMIC STRESS INTENSITY FACTORS IN ORTHOTROPIC FUNCTIONALLY GRADED MATERIALS USING DISPLACEMENT CORRELATION TECHNIQUE. MODARES MECHANICAL ENGINEERING[Internet]. 2016;16(3):79-86. Available from: https://sid.ir/paper/178506/en

IEEE: Copy

RAHMATOLLAH GHAJAR, MOHAMMAD REZA VARAVI, and SAFA PEYMAN, “CALCULATION OF STATIC AND DYNAMIC STRESS INTENSITY FACTORS IN ORTHOTROPIC FUNCTIONALLY GRADED MATERIALS USING DISPLACEMENT CORRELATION TECHNIQUE,” MODARES MECHANICAL ENGINEERING, vol. 16, no. 3, pp. 79–86, 2016, [Online]. Available: https://sid.ir/paper/178506/en

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