scholarly journals Evaluation of Internal Stress in Short-Carbon-Fiber Reinforced Plastics by Transmission X-Ray Diffraction

2016 ◽  
Vol 65 (9) ◽  
pp. 657-664 ◽  
Author(s):  
Kenichi SHIMIZU ◽  
Yuki KOIKE ◽  
Daiki YAMADA ◽  
Kazuya OHARADA ◽  
Keisuke TANAKA ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Internal Stress ◽  
Fiber Reinforced ◽  
X Ray Diffraction ◽  
Short Carbon Fiber ◽  
X Ray ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Fiber Reinforced Plastics ◽  
Short Carbon

scholarly journals Fatigue Damage Evaluation of Short Carbon Fiber Reinforced Plastics Based on Thermoelastic Temperature Change and Second Harmonic Components of Thermal Signal

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4941
Author(s):  
Daiki Shiozawa ◽  
Takahide Sakagami ◽  
Yu Nakamura ◽  
Takato Tamashiro ◽  
Shinichi Nonaka ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Temperature Change ◽  
Stress Level ◽  
Second Harmonic ◽  
Fiber Reinforced ◽  
Carbon Fiber Reinforced Plastics ◽  
Reinforced Plastics ◽  
Thermal Signal ◽  
Fiber Reinforced Plastics ◽  
Short Carbon

Short fiber reinforced plastics (SFRPs) have excellent moldability and productivity compared to continuous fiber composites. In this study, thermoelastic stress analysis (TSA) was applied to detect delamination defects in short carbon fiber reinforced plastics (SCFRPs). The thermoelastic temperature change ΔTE, phase of thermal signal θE, and second harmonic temperature component ΔTD were measured. In the fatigue test of SCFRP, it was confirmed that changes in ΔTE, θE, and ΔTD appeared in the damaged regions. A staircase-like stress level test for a SCFRP specimen was conducted to investigate the generation mechanism of the ΔTD. The distortion of the temperature change appeared at the maximum tension stress of the sinusoidal load—and when the stress level decreased, the temperature change returned to the original sinusoidal waveform. ΔTD changed according to the change in the maximum stress during the staircase-like stress level test, and a large value of ΔTD was observed in the final ruptured region. A distortion of the temperature change and ΔTD was considered to be caused by the change in stress sharing condition between the fiber and resin due to delamination damage. Therefore, ΔTD can be applied to the detection of delamination defects and the evaluation of damage propagation.

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