【摘要】 研究了短切玻纤增强尼龙6(PA6/SGF)的缺口拉伸性能。结果表明,在实验速度范围(0.1～500mm/min)内,PA6/SGF的拉伸断裂功主要消耗在裂纹萌生过程。一旦裂纹源尺寸达到临界值,裂纹瞬间扩展。拉伸位移随着拉伸速度的增加而降低,最大力值随着拉伸速度的增加先提高后降低。当拉伸速度达到300mm/min后,最大力值和拉伸位移急剧下降导致拉伸断裂功大幅度下降。PA6/SGF的缺口拉伸断面主要分为裂纹萌生区及裂纹扩展区,基体的塑性变形主要集中在裂纹萌生区,剧烈的塑性变形可使基体上出现明显的孔洞。在裂纹扩展区,裂纹的快速扩展导致基体断面平坦,且由于SGF的阻碍作用,基体具有断裂分层现象。更多还原

【Abstract】 The notched tensile property of short glass fiber reinforced PA6(PA6/SGF) was studied. The results showed that the fracture work was mainly consumed in crack initiation process in tensile velocity range 0.1-500 mm/min. Crack quickly propagated as soon as the crack origin achieved critical value. The tensile displacement decreased with tensile velocity increasing. The maximum force firstly increased,and then decreased with tensile velocity increasing. After tensile velocity achieving 300mm/min,the rapid decreasing of maximum force and tensile displacement resulted in the fracture work violently decreasing. The fracture surface was divided into crack initiation region and crack propagation region. The violent plastic deformation of matrix mainly occured in crack initiation region,which resulted in the holes in matrix. The crack propagation surface was smooth and processed fracture layers because of the obstruction of glass fibers.更多还原