Fiber orientation of polymer injection weld and its strength evaluation

Jae Kyoo Lim, Tetsuo Shoji

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This paper discusses the microstrure related fracture behavior of short-fiber reinforced thermoplastics. The microstructure of an injection molded weld was studied by microscopic methods for the purpose of describing fiber orientation. Injection welds are the place where two flow fronts come together, leading to fiber orientations having flower and volcano-like patterns. The polymer composite materials used in the experiment were polycarbonate(PC) with amorphous structure containing 30% short glass fiber and polyphenylene sulfide(PPS) with crystalline structure containing 40% short glass fiber. The specimen used was a dumbbell type tensile specimen with a weld line created by double gate injection molding. Microtoming technique was used for slicing ultrathin sections from the molded polymer parts. Microstructural analysis of fiber orientation at injection weld was carried out using light transmission microscopy (LM) and scanning electronic microscopy (SEM).

Original languageEnglish
Pages (from-to)173-181
Number of pages9
JournalKSME Journal
Issue number2
Publication statusPublished - 1993 Jan 1


  • Fiber Orientation
  • Microtoming Technique
  • Polycarbonate
  • Polymer Injection Weld
  • Polyphenylene Sulfide
  • SEM
  • Tensile Strength
  • V-Notch

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering


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