High-Cycle Fatigue of Polyamide-6,6 and Glass Fiber-Based Short Fiber Composite Using Finite Element Analysis
2021-01-5051
05/11/2021
- Features
- Event
- Content
- As the automotive industry strives for an increased fuel economy, lightweighting is a key factor and can be realized through composite materials. Composites have better strength-to-weight ratio as compared to metals. In this paper, static and fatigue analysis is performed on an oil pan made of polyamide-6,6 and 50% glass fiber (PA66-GF50). PA66 has a glass transition temperature of 170°C; therefore, it is suitable for automotive applications where the operating range is −40°C to 150°C. Long glass fiber (LGF) composite has an aspect ratio of 30-50 in the oil pan. Fibers break in the molding process but are still considerably longer than with conventionally compounded short glass fiber (SGF) composite, where the aspect ratio of fiber is between 10 and 20. However, the computer-aided engineering (CAE) procedure for life prediction of short glass fiber-reinforced (SGFR) plastic versus LGF-reinforced plastic is the same. CAE simulations have been performed for both static and fatigue analysis, and results are compared to the physical test. The fiber orientation of the composite is generated in Moldflow software using flow properties and multiple gate locations. These orientation tensors are used in static load displacement and fatigue life prediction. Fatigue properties of short fiber are derived from 0°/45°/90° coupon tests at room temperature, constant stress ratio, and relative humidity RH50 condition. Life predicted from finite element analysis (FEA) is compared to the physical test performed on the oil pan using the same environmental and test condition.
- Pages
- 11
- Citation
- Singh, S., and Wys, D., "High-Cycle Fatigue of Polyamide-6,6 and Glass Fiber-Based Short Fiber Composite Using Finite Element Analysis," SAE Technical Paper 2021-01-5051, 2021, https://doi.org/10.4271/2021-01-5051.