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采用静态单轴拉伸手段,研究了不同试验温度(-40℃、20℃、50℃)、相同拉伸速率(500mm/min)以及相同试验温度(-40℃)、不同拉伸速率(50mm/min、100mm/min、500mm/min)对三元乙丙橡胶类包覆层拉伸应力应变性能的影响。研究结果表明:同一拉伸速率(500mm/min),-40℃试验温度,材料发生脆性断裂,20℃、50℃试验温度,材料均发生屈服、高弹形变直至断裂;随着温度的升高,拉伸强度降低,拉断伸长率增加;同一试验温度(-40℃),拉伸速率为500mm/min时,材料发生脆性断裂,拉伸速率为50mm/min和100mm/min时,材料发生弹性形变。结合GJB770B-2005方法413.1,选用100mm/min的拉伸速率比较适合。
The effects of different test temperature (-40 ℃, 20 ℃, 50 ℃), the same tensile rate (500mm / min) and the same test temperature (-40 ℃) / min, 100mm / min, 500mm / min) on the tensile stress-strain properties of EPDM claddings. The results show that the brittle fracture occurs at the test temperature of-40 ℃ and the test temperature of 20 ℃ and 50 ℃ at the same tensile rate (500mm / min), the materials all yield and deform until the fracture occurs. With the increase of temperature , The tensile strength decreases and the elongation at break increases. At the same test temperature (-40 ℃) and the tensile rate of 500mm / min, the material brittle fracture, the tensile rate of 50mm / min and 100mm / min, the material Elastic deformation occurred. Combined with GJB770B-2005 method 413.1, the selection of 100mm / min stretching rate is more suitable.