Internal Stress Measurement of FRP Materials in Very Low Temperature and High Temperature

2017 Fiscal Year Final Research Report

• Project/Area Number: 25420037
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Materials/Mechanics of materials
• Research Institution: Kobe City College of Technology
• Principal Investigator: Nishida Masayuki 神戸市立工業高等専門学校, その他部局等, 教授 (80332047)
• Project Period (FY): 2013-04-01 – 2018-03-31
• Keywords: X線応力測定 / 複合材料 / CFRP / 極低温 / その場測定

Outline of Final Research Achievements

Residual stresses in the carbon fiber and the polyamide matrix of CFRP composites were measured by the x-ray stress measurement method. In this study, a transmission method of x-ray diffraction was employed for the residual stress measurement of the sin^2psi method. The transmission method enabled to estimate the stress measurement used low angle diffraction peaks. Many stable results were obtained from these new trials. It was succeed to estimate residual stresses in the CFRP pipe and plate by this method. Furthermore, the in-situ residual stresses measurement in the very low temperature is tried using a cryostat system. However, there is a problem in the sample cooling conditions. This is an unexpected phenomenon, and it is under investigation to determine the cause.

Free Research Field

材料強度