Scanning acoustic microscopy investigation of weld lines in injection-molded parts manufactured from industrial thermoplastic polymer

被引:10
作者
Mohamed, Esam T. Ahmed [1 ]
Zhai, Min [1 ,2 ]
Schneider, G. [4 ]
Kalmar, R. [4 ]
Fendler, M. [4 ]
Locquet, Alexandre [1 ,2 ]
Citrin, D. S. [1 ,2 ]
Declercq, N. F. [1 ,3 ]
机构
[1] Georgia Tech Lorraine, Georgia Tech, CNRS UMI2958, 2 Rue Marconi, F-57070 Metz, France
[2] Georgia Inst Technol, Sch Elect & Comp Engn, Atlanta, GA 30332 USA
[3] Georgia Inst Technol, Sch Mech Engn, Atlanta, GA 30332 USA
[4] CEA Tech, 5 Rue Marconi,Batiment Austrasie, F-57070 Metz, France
关键词
Scanning acoustic microscopy; Terahertz imaging; RSAW; Anisotropy; Injection molded plastic weld lines; Birefringence; MECHANICAL-PROPERTIES; PARAMETERS;
D O I
10.1016/j.micron.2020.102925
中图分类号
TH742 [显微镜];
学科分类号
摘要
Scanning acoustic microscopy (SAM) is used to characterize welds in a thermoplastic polymer (ABS) manufactured by injection-molding, particularly at the locations of weld-lines known to form as unavoidable significant defects. Acoustic micrographs obtained at 420 MHz clearly resolve the weld lines with morphological deformations and microelastic heterogenity. This is also where terahertz (THz) measurements, carried out in support of the SAM study, reveal enhanced birefringence corresponding to the location of these lines enabling verification of the SAM results. Rayleigh surface acoustic waves (RSAW), quantified by V(z) curves (with defocusing distance of 85 mu m), are found to propagate slower in regions close to the weld lines than in regions distant from these lines. The discrepancy of about 100 m/s in the velocity of RSAW indicates a large variation in the micro-elastic properties between areas close to and distant from the weld lines. The spatial variations in velocity (VR) of RSAWs indicate anisotropic propagation of the differently polarized ultrasonic waves.
引用
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页数:6
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