1. Investigation on very high cycle fatigue of PA66-GF30 GFRP based on fiber orientation
- Author
-
Yong Kap Kim, Chang Soon Lee, Hee Jun Kim, Jeong Hwan Choo, In Sik Cho, and Auezhan Amanov
- Subjects
Materials science ,Fiber orientation ,Glass fiber ,General Engineering ,Fatigue testing ,02 engineering and technology ,Fibre-reinforced plastic ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Fatigue limit ,0104 chemical sciences ,Ultimate tensile strength ,Ceramics and Composites ,Fracture (geology) ,Composite material ,0210 nano-technology ,Ultrasonic fatigue - Abstract
The purpose of this study is to evaluate the effects of glass fiber (GF) of PA66-GF30 orientation on very high cycle fatigue (HVCF) life and also to develop an optimized test apparatus such as measurement of dynamic elastic modulus and design of test specimens. Dynamic elastic modulus, tensile strength and fatigue strength tests were conducted at room temperature based on GF orientation (0°, 45°, 90°). Conventional fatigue (3 Hz) and ultrasonic fatigue (20 kHz) tests were performed at the same stress ratio (R = ā1). Fracture surface observation showed that GF 0° exhibited a higher fatigue strength in comparison with GF 45 and 90°. Various defects such as voids and microcracks to the load direction around the GF end or debonding in glass fiber reinforced plastic (GFRP) and the slope change in very long life regime of SāN diagram.
- Published
- 2019
- Full Text
- View/download PDF