PA6单边缺口拉伸性能的研究  

Study on Single Notched Tensile Properties of PA6

作　　者：刘振宇[1,2] 熊玉竹[1,2,3] 梅文杰[1] 

机构地区：[1]贵州大学材料科学与冶金工程学院,贵州贵阳550003 [2]贵州省材料强度与结构重点实验室,贵州贵阳550003 [3]国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014

出　　处：《塑料工业》2013年第11期84-86,99,共4页China Plastics Industry

摘　　要：对尼龙6（PA6）进行不同缺口深度和不同缺口曲率半径的单边缺口拉伸试验，同时采用SEM观察断口形貌。结果表明，随着缺1：5曲率半径的增加，PA6缺口尖端应力呈逐渐降低，而断裂伸长率呈逐渐上升趋势。缺口曲率半径在0．1～0．5mm范围内时，拉伸断裂功基本消耗在裂纹萌生阶段，PA6裂纹扩展区表现为脆性断裂方式。当缺口曲率半径大于0．5mm后，拉伸断裂功主要消耗在裂纹扩展阶段，PA6裂纹扩展区表现为韧性断裂方式。随着缺口深度的增加，缺口附近应力集中程度增大，PA6塑性变形能力下降，缺口尖端应力呈逐渐增大，而断裂伸长率呈逐渐下降趋势，PA6的破坏方式由韧性断裂逐渐转变为脆性断裂。The experimental investigation of the effect of notch root radius and notch depth on tensile properties of PA6 and the fracture morphology was characterized by SEM has been given in the paper. The result showed that： with the increase of notch root radius, PA6 notch tip stress gradually decreased and the elongation at break increased. In notch root radius range （0. 1 -O. 5 mm）, the tensile fracture energy was dissipated in process of crack initiation and PA6 was showed brittle fracture. When the gap after the radius of curvature was more than O. 5 mm, the tensile fracture energy dissipated in process of crack propagation and PA6 showed ductile fracture. With increase of notch depth, PA6 stress concentration increased, the plastic deformation capacity was decrease, and PA6 notch tip stress gradually increased and the elongation at break decreased, and PA6 failure mode from ductile to brittle fracture gradually.

关 键 词：尼龙6 缺口曲率半径 缺口深度 缺口尖端应力 断裂伸长率 断裂方式 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]