This paper presents an investigation of ceramic shell cracking during the burnout process in investment casting with internally webbed laser stereolithography patterns. We hypothesize that shell cracking will occur when the rupture temperature of the ceramic shell is lower than both the glass transition temperature of the pattern material and the web· link buckling temperature. The hypothesis is validated by our experimental observations which confirm the numerical predictions from our finite element analysis. This provides a basis for design of the internal web geometry of a lithography pattern and evaluation of the burnout process with such a pattern. We show the shell cracking and weblink buckling temperatures to be functions of the pattern geometry (including the cross-sectional dimensions and span length of the web link) and the shell thickness.

Meeting Name

9th Annual Solid Freeform Fabrication Symposium (1998: Aug. 11-13, Austin, TX)


Mechanical and Aerospace Engineering


This work was partially supported by the Multi-lifecycle Engineering Research Center at New Jersey Institute of Technology and by the National Science Foundation.

Keywords and Phrases

Rapid Prototyping; Investment Casting; Solid Freeform Fabrication; Rapid Tooling

Document Type

Article - Conference proceedings

Document Version

Final Version

File Type




Publication Date

13 Aug 1998

Included in

Manufacturing Commons