No.8（2013）18.Influence of part-build orientation on mechanical properties of resin plates built by SLS

Takashi Kigure, Yukio Yokoyama, Yuki Yamauchi, Toshiyuki Yamanaka

  The mechanical properties of a resin plates built by selective laser sintering (SLS) were investigated. SLS is one of process to build a model directly from 3D digital data and is a very promising technology. However it is known that models built using this process show different characteristic in different orientation.
  In this study, Tensile strength, fracture strain and Young’s modulus on the resin plates built in various orientations by SLS were measured via a tensile test. Specimens were built in the direction between 0° and 90°. 0° was defined as parallel to the lamination plane and 90° was defined as layer direction. The material used in this study was Nylon-12 which is a popular material in SLS. As a result of tensile tests, tensile strength and fracture strain was found to depend on part-build orientation (anisotropy); however Young’s modulus was not depended on it.
  In order to describe the difference in tensile strength, the Tsai-Hill failure criterion which is a popular theory for anisotropic material was applied for the test result. It is considered that this theory is able to estimate the tensile strength of the parts built by SLS. And this criterion showed good coincidence with the test results.

Keywords
Selective laser sintering (SLS), Anisotropy, Mechanical property, Part-built orientation

Back to Contents