Effect of Temperature on Acoustic Emission Evaluation of FRP Vessels (Tensile Specimens)

2006 ◽  
Vol 129 (3) ◽  
pp. 516-524 ◽  
Author(s):  
Yizhuo Chen ◽  
Paul Ziehl ◽  
Guillermo Ramirez ◽  
Timothy J. Fowler
Keyword(s):  
Experimental Investigation ◽  
Acoustic Emission ◽  
Elevated Temperature ◽  
Operating Temperature ◽  
Fiber Reinforced Polymer ◽  
Effect Of Temperature ◽  
Reinforced Polymer ◽  
Emission Testing ◽  
Acoustic Emission Testing ◽  
American Society

Current American Society of Mechanical Engineers (ASME) provisions require that acoustic emission testing for class II vessels be carried out at operating temperature in the event that the operating temperature exceeds 120°F(49°C). This causes increased cost due to the need for a boiler. Safety is also a concern due to the possibility of a leak or failure of the vessel during testing. More important than these two items is the lack of data that is available from fiber reinforced polymer (FRP) vessels and/or components that have been subjected to acoustic emission evaluation at elevated temperature. This has lead to speculation regarding the appropriateness of conducting acoustic emission evaluations at elevated temperature. To address these issues an experimental investigation was conducted on representative coupon specimens at differing temperatures. The results of the investigation are described.

Influence of Elevated Temperature on the Acoustic Emission Evaluation of FRP Vessels Through Internal Fluid Pressure Tests

2009 ◽  
Vol 131 (5) ◽  
Author(s):  
Guillermo Ramirez ◽  
Paul H. Ziehl ◽  
Timothy J. Fowler
Keyword(s):  
Acoustic Emission ◽  
Elevated Temperature ◽  
Operating Temperature ◽  
Fluid Pressure ◽  
Pressure Vessels ◽  
The Body ◽  
Emission Testing ◽  
Internal Fluid ◽  
Asme Code ◽  
Acoustic Emission Testing

A research program evaluating the effect of elevated temperature in the acoustic emission testing of fiberglass vessels was completed recently. The program aimed at evaluating the current ASME provisions that require acoustic emission testing for Class II vessels be carried out at operating temperature in the event that the operating temperature exceeds 49°C (120°F). Lack of data from fiber reinforced polymer vessels and/or components that have been subjected to acoustic emission evaluation at elevated temperature has resulted in speculation regarding the appropriateness of conducting the acoustic emission evaluation at elevated temperature. To address these issues, an experimental investigation was conducted on representative coupon specimens and pressurized cylindrical specimens at differing temperatures. The results from the coupon tests were presented in a previous publication. This paper will present the results of the cylindrical specimens and compare them to the coupon specimens drawing the final conclusions from the overall results of the program. The results from this study resulted in changes in the body of the ASME code for testing pressure vessels with acoustic emission at temperature.

scholarly journals Acoustic Emission Testing and Ib-Value Analysis of Ultraviolet Light-Irradiated Fiber Composites

2021 ◽  
Vol 11 (14) ◽  
pp. 6550
Author(s):  
Doyun Jung ◽  
Wonjin Na
Keyword(s):  
Acoustic Emission ◽  
Irradiation Time ◽  
Tensile Load ◽  
Failure Behavior ◽  
Value Analysis ◽  
Emission Testing ◽  
Final Failure ◽  
Acoustic Emission Testing ◽  
Woven Glass Fiber ◽  
Ae Signals

The failure behavior of composites under ultraviolet (UV) irradiation was investigated by acoustic emission (AE) testing and Ib-value analysis. AE signals were acquired from woven glass fiber/epoxy specimens tested under tensile load. Cracks initiated earlier in UV-irradiated specimens, with a higher crack growth rate in comparison to the pristine specimen. In the UV-degraded specimen, a serrated fracture surface appeared due to surface hardening and damaged interfaces. All specimens displayed a linearly decreasing trend in Ib-values with an increasing irradiation time, reaching the same value at final failure even when the starting values were different.

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