Study on anisotropy of inside decorative material of the ceiling of cars

This paper takes the inside decorative material of the ceiling of cars,which is polyester fiber,needle-punched nonwoven fabric,as the objective of exploration.The indexes were tested,such as breaking strength and elongation at all directions,width of the sample after breaking,crease recovery angle,relaxation(reduction rate of strength),fatigue(reduction rate of breaking strength),and their change rule and forming cause are investigated.It is found that there exists obvious anisotropy of the decorative material of the ceiling of cars.The density of surface and the processing process have significant impact on the anisotropy of the product.Breaking strength first decreases with sampling angle increasing,and when reduced to 45°,the decreasing trend of the breaking strength slows down.The breaking elongation,fatigue and relaxation increase with sampling angle increasing.The width and crease recovery angles of fractured specimens drop as the sampling angle increases.