A New Finite Element Model with Manufactured Error for Additive Manufacturing

作者：Xia, Zhaohui; He, Zhihao; Wang, Qifu; Wang, Yingjun^*

来源：CMES-COMPUTER MODELING IN ENGINEERING & SCIENCES, 2020, 124(2): 703-720.

DOI：10.32604/cmes.2020.010368

• 3D printing
• overhangs
• finite element analysis
• manufacturing error
• Additive manufacturing

Additive manufacturing (AM), adding materials layer by layer, can be used to produce objects of almost any shape or geometry. However, AM techni- ques cannot accurately build parts with large overhangs, especially for the large features close to horizontal, hanging over the void. The overhangs will make the manufactured model deviate from the design model, which will result in the performance of the manufactured model that cannot satisfy the design require- ments. In this paper, we will propose a new finite element (FE) analysis model that includes the manufacturing errors by mimicking the AM layer by layer con- struction process. In such FE model, an overhang coef ficient is introduced to each FE, which is de fined by the support elements in the lower layer. By mimicking the AM process from the bottom layer to the top layer, all the FE properties are updated based on their overhang coef ficients, which makes the computational model be able to predict the manufactured model with manufacturing errors. The proposed model can be used to predict the performance of the AM objects in the design stage, which will help the designers to improve their design by the simulation results.

• 单位
  华中科技大学