不同拉伸速度下尼龙66材料的性能研究

Study of Properties for Nylon 66 Material under Different Tensile Speeds

研究不同拉伸速度对两种尼龙(PA)材料(纯PA66和增韧PA66)拉伸性能的影响,并通过扫描电子显微镜(SEM)研究不同速度下PA材料的断口形貌。结果表明,无论增韧与否,随着拉伸速度的减小,拉伸强度下降,断裂伸长率增加。当拉伸速度足够小时,纯PA66由脆性断裂转变为韧性断裂。从SEM结果可以看出,两种PA材料拉伸断口的平坦区面积均随着拉伸速度下降而增加。由于增韧PA66的两相结构,两种PA材料拉伸断口形貌存在显著差异。

The tensile properties of nylon materials（pure PA66 and toughening PA66） under different tensile speeds （0.001-500 mm/min） were researched. Scanning electron microscopy（SEM） was used to study the fracture morphology of the nylon materials under different speeds. The results show that,the tensile strength of the two nylon materials decreases respectively with tensile speed decreases,and elongation at break increases. When the tensile speed is small enough,the brittle-tough transition of pure PA66 appears. From SEM images,the tensile fracture flat area of both pure PA66 and toughening PA66 increase with tensile speed decreases. Due to two-phase structure of toughening PA66,different fracture surfaces are obtained of the two types PA66 materials.