A material point method framework for the simulation of extrusion based additive manufacturing processes
Başlık çevirisi mevcut değil.
- Tez No: 598840
- Danışmanlar: PROF. TAREK I. ZOHDI
- Tez Türü: Doktora
- Konular: Makine Mühendisliği, Mechanical Engineering
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2018
- Dil: İngilizce
- Üniversite: University of California Berkeley
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 105
Özet
Özet yok.
Özet (Çeviri)
Additive Manufacturing (AM), also known as 3D Printing (3DP) or rapid prototyping, is de ned as building three-dimensional objects by adding materials in a layer-by-layer fashion. Although AM technologies have been developed since the late 1980's, they have garnered academic and industrial interest in the past ten years due to its wide application in di erent industrial elds such as automotive, aerospace, biomedical, architecture, and medicine. Currently, AM is seen as a clever solution in a more and more complex manufacturing environment, speci cally in terms of customization, multifunctionality, innovative design, and geometry. Many industrial companies are now trying to improve their manufacturing capabilities by adopting di erent AM technologies to fabricate their products. In this study, a computational framework is developed to optimize process parameters and simulate residual stresses in extrusion-based additive manufacturing processes. A particlebased method, namely the material point method (MPM) is adopted for simulations. The proposed numerical framework has two main parts. In the rst part, the extrusion behavior of print material is simulated. Here, the uid ow is modeled as an incompressible viscous uid with the thermal changes due to cooling accounted for the simulations. Moreover, the main MPM code is coupled with the level set method and the ghost uid method to track the free surface and apply the free surface boundary conditions. In the second part, a thermomechanical model is solved to investigate the cooling-induced residual stresses of extruded material. The applicability of the proposed numerical framework is rst validated by solving select representative problems and comparing with other numerical methods. Then, it is applied to the extrusion-based manufacturing processes. The e ects of di erent process parameters (nozzle velocity, extrusion velocity, nozzle temperature, etc.) are investigated by adopting a parametric study.
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