| タイトル | Distortion and Residual Stress Control in Integrally Stiffened Structure Produced by Direct Metal Deposition |
| 本文（外部サイト） | http://hdl.handle.net/2060/20080013388 |
| 著者（英） | Lin, Shih-Yung; Domack, Marcia S.; Hoffman, Eric K. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2007-06-27 |
| 言語 | eng |
| 内容記述 | 2-D thermo-mechanical model developed to characterize distortion and residual stresses in integral structure produced by DMD. Demonstrated as a tool to guide experimental development of DMD fabrication process for aero structures. Distortion and residual stresses are local to deposit. Most distortion develops during deposition of the first few layers; Little change in distortion or residual stresses after fifth deposit layer Most of distortion is localized just beneath the build. Thicker build plates and the use of build lands results in greatest decrease in levels of distortion. Pre-straining shown to reduce distortion. Difficult to implement, particularly for complex stiffener arrays. Clamp position has complex effect on distortion and stresses. Overall distortion reduced with decreasing clamp clearance. Larger clamp clearances induce bending. Use of pre-heat and active cooling show minor influence on panel distortion. Generate changes in thermal gradients in the build plate. |
| NASA分類 | Metals and Metallic Materials |
| 権利 | Copyright, Distribution as joint owner in the copyright |
