江蘇春晨電纜有限公司生產YFFBPGG扁電纜 春晨3*120，YFFBPGG扁電纜 春晨3*120，
如45號鋼經亞火處理後疲勞極限為34.3MPa，經退火處理後為24.5MPa。經840℃淬火，420℃回火處理後為52.9MPa。由此可見45號鋼經不同熱處理後其機械性能有很大不同。
For example, the fatigue limit of 45 steel is 34.3mpa after sub fire treatment and 24.5mpa after annealing treatment. After quenching at 840 ℃ and tempering at 420 ℃, it is 52.9mpa. It can be seen that the mechanical properties of 45 steel are very different after different heat treatment.
環氧酚醛玻璃鋼的疲勞特性：玻璃鋼是一種多相材料，是一種纖維重合材料，是一種脆性材料（延伸率小於5%）
Fatigue characteristics of epoxy phenolic FRP: FRP is a kind of polyphase material, a kind of fiber coincidence material, and a kind of brittle material (elongation less than 5%)
玻璃鋼的疲勞過程：玻璃鋼的疲勞破壞過程是界面脫膠、樹脂開裂和纖維斷裂的綜合過程。對於玻璃鋼壓板來說，破壞開始於與交變應力方向垂直的橫向纖維束內，首先是界面個別點處的脫膠，脫膠沿著纖維方向發展，致使橫向纖維束產生剝離。經過一段時間，樹脂內產生裂紋，部件由半透明逐漸變為不透明，當裂紋進一步擴大時，局部纖維開始斷裂，破壞區的樹脂變為白色粉末，後部件破壞。
Fatigue process of FRP: the fatigue failure process of FRP is a comprehensive process of interface degumming, resin cracking and fiber fracture. For FRP laminates, the failure begins in the transverse fiber bundle perpendicular to the direction of alternating stress. The first is the degumming at individual points of the interface, which develops along the fiber direction, causing the transverse fiber bundle to peel off. After a period of time, there are cracks in the resin, and the parts gradually become opaque from translucency. When the cracks further expand, local fibers begin to break, the resin in the damaged area becomes white powder, and finally the parts are damaged.
影響玻璃鋼疲勞強度的因素：玻璃鋼是由無鹼玻璃纖維布和合成樹脂復合而成的材料，樹脂種類不同時玻璃鋼的疲勞強度也不同。對同類樹脂來說，採用酚醛樹脂或環氧樹脂比採用聚酯樹脂時的疲勞強度高。耐熱型比普通型的疲勞強度高。若樹脂強度相同，延伸率高的樹脂其玻璃鋼的疲勞強度也高。
Factors affecting the fatigue strength of FRP: FRP is a composite material composed of alkali free fiberglass cloth and synthetic resin. The fatigue strength of FRP varies with different resin types. For the same kind of resin, the fatigue strength of phenolic resin or epoxy resin is higher than that of polyester resin. The fatigue strength of heat resistant type is higher than that of common type. If the strength of resin is the same, the fatigue strength of FRP with high elongation is also high.
應力集中對玻璃鋼的疲勞強度影響也較嚴重，在靜態載荷作用下，玻璃鋼比金屬有較高的缺口敏感性，金屬的應力集中係數為3,玻璃鋼層壓板的應力集中係數 為3~9。
The influence of stress concentration on the fatigue strength of FRP is also serious. Under the static load, FRP has higher notch sensitivity than metal. The stress concentration coefficient of metal is 3, and the stress concentration coefficient of FRP laminate is 3 ~ 9.
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