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51315-5783-Back-Face Strain Compliance Relation for SEN (B) Specimens for Wide Range in Crack Lengths

Picture for Back-Face Strain Compliance Relation for SEN (B) Specimens for Wide Range in Crack Lengths
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Product Number: 51315-5783-SG
ISBN: 5783 2015 CP
Author: Rodrigo Garcia
Publication Date: 2015
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An alternative method to the Direct Current Potential Drop (DCPD) for the fatigue crack growth rate (FCGR) measurement called Back Face Strain (BFS) is known more than 30 years in the literature. However recently the BFS suffered considerable improvements for two reasons: (1) the high-efficiency calibration curve obtained by finite elements for the FCGR measurement specifically for Compact Tension C(T) specimen; (2) an improvement of polymers composites resins and strain gages development with better performance which confers a more efficient bound process in metals. Although C(T) specimen requires lower loads to obtain a crack-tip stress-intensity factor single-edge notched bend SENB could have a better representation of the oil pipeline crack-tip stress-intensity factor. This paper aimed to establish a relationship between BFS compliance equation with a fatigue testing in SENB specimen measured with BFS method. Futhermore we developed an efficient sealing system of the strain gage which allowed the use of BFS method in SENB specimen even in acidic environments and cathodic protection. Afterwards an optical microscopy was applied for data validation. The relationship was validated and a good accuracy is found applying both techniques with this new perspective.
An alternative method to the Direct Current Potential Drop (DCPD) for the fatigue crack growth rate (FCGR) measurement called Back Face Strain (BFS) is known more than 30 years in the literature. However recently the BFS suffered considerable improvements for two reasons: (1) the high-efficiency calibration curve obtained by finite elements for the FCGR measurement specifically for Compact Tension C(T) specimen; (2) an improvement of polymers composites resins and strain gages development with better performance which confers a more efficient bound process in metals. Although C(T) specimen requires lower loads to obtain a crack-tip stress-intensity factor single-edge notched bend SENB could have a better representation of the oil pipeline crack-tip stress-intensity factor. This paper aimed to establish a relationship between BFS compliance equation with a fatigue testing in SENB specimen measured with BFS method. Futhermore we developed an efficient sealing system of the strain gage which allowed the use of BFS method in SENB specimen even in acidic environments and cathodic protection. Afterwards an optical microscopy was applied for data validation. The relationship was validated and a good accuracy is found applying both techniques with this new perspective.
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