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Paper Information

Journal:   IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN)   FEBRUARY-MARCH 2007 , Volume 19 , Number 6 (ISSUE NO. 86); Page(s) 439 To 450.
 
Paper: 

DETERMINATION OF CALIBRATION FACTORS OF THE CENTRAL HOLE DRILLING METHOD FOR ORTHOTROPIC COMPOSITES USING AN EXACT SOLUTION

 
 
Author(s):  SHOKRIEH M.M.*, GHASEMI KHOUZANI A.R.
 
* DEPARTMENT OF MECHANICAL ENGINEERING, IRAN UNIVERSITY OF SCIENCE AND TECHNOLOGY, TEHRAN, IRAN
 
Abstract: 

The hole drilling method has been used for determination of residual stresses in various materials. The released strains measured by the hole drilling method are converted to residual stresses using calibration factors. There is a standard for hole drilling method for isotropic materials. Also for orthotropic materials, there are various methods for converting the released strains to residual stresses. In these methods the numbers of calibration factors vary from two to nine (a three by three matrix). In this research, using an exact solution method, calibration factors for orthotropic plates are determined. For this purpose, by assuming a plane stress condition, the stresses and strains around the area under a rosette strain gauge mounted to an orthotropic plate are calculated. Making a hole in the centre of the rosette strain gauge changes the distribution of the stress and strain forces. Using the closed form solution proposed in this research the released strains and the calibration factors are calculated, and the residual stresses are evaluated. Using the proposed method, calibration factors for any orthotropic material with any level of orthotropy are calculated.
These factors are independent of loading levels and depend on material properties of orthotropic materials and ratio of the rosette diameter to the hole diameter. The material properties and the ratio of the rosette diameter to the hole diameter are considered in the equations, therefore there is no need for presenting the results in tabular form or any interpolations. The results for an orthotropic unidirectional ply made of carbon/epoxy are obtained. Also the calibration factors for three different dunidirectional composites are calculated. The data from the proposed closed form solution are compared with the 'simulated hole drilling method which has been proposed by authors earlier. A good agreement between the results shows the reliability of the closed form solution presented in this study.

 
Keyword(s): EXACT SOLUTION, RESIDUAL STRESS, ORTHOTROPIC MATERIAL, CALIBRATION FACTORS, HOLE DRILLING METHOD
 
 
References: 
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Cite:
APA: Copy

SHOKRIEH, M., & GHASEMI KHOUZANI, A. (2007). DETERMINATION OF CALIBRATION FACTORS OF THE CENTRAL HOLE DRILLING METHOD FOR ORTHOTROPIC COMPOSITES USING AN EXACT SOLUTION. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), 19(6 (ISSUE NO. 86)), 439-450. https://www.sid.ir/en/journal/ViewPaper.aspx?id=108066



Vancouver: Copy

SHOKRIEH M.M., GHASEMI KHOUZANI A.R.. DETERMINATION OF CALIBRATION FACTORS OF THE CENTRAL HOLE DRILLING METHOD FOR ORTHOTROPIC COMPOSITES USING AN EXACT SOLUTION. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN). 2007 [cited 2021April15];19(6 (ISSUE NO. 86)):439-450. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=108066



IEEE: Copy

SHOKRIEH, M., GHASEMI KHOUZANI, A., 2007. DETERMINATION OF CALIBRATION FACTORS OF THE CENTRAL HOLE DRILLING METHOD FOR ORTHOTROPIC COMPOSITES USING AN EXACT SOLUTION. IRANIAN JOURNAL OF POLYMER SCIENCE AND TECHNOLOGY (PERSIAN), [online] 19(6 (ISSUE NO. 86)), pp.439-450. Available at: <https://www.sid.ir/en/journal/ViewPaper.aspx?id=108066>.



 
 
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