Chikosha, SMachaka, RonaldChikwanda, HK2016-07-112016-07-112015-05Chikosha, S., Machaka, R. and Chikwanda, L.H.K. 2015. Evaluating the Johanson theory for titanium powder. Materials Science Forum, 828-829,447-452.1662-975210.4028/www.scientific.net/MSF.828-829.447http://hdl.handle.net/10204/8610Copyright: 2015 Tras Tech Publications. Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's website. The definitive version of the work is published in Materials Science Forum,828-829,447-452Direct powder rolling (DPR)/roll compaction has been labelled a complex and sample sensitive process. As such the design of the instrument and the determination of the optimal processing conditions for a given feed are very challenging. The challenge is attributed to a wide range of operating parameters and material properties. Several theoretical models can be used to evaluate the interaction of the different parameters and properties and how their changes affect the rolling process. In this study, the Johanson theory was used to determine the rolling parameters of titanium powder. Preliminary results of the nip angle, nip pressures and maximum horizontal pressures of the mill for the powder rolled on a 55mm diameter roll with roll gap sizes of 0.175, 0.15 and 0.05 mm were obtained. The results were found to be acceptable for the nip angle estimation, however improvement on predicting the maximum horizontal pressure is required.enDirect powder rollingMaximum pressureJohanson theoryTitanium powderiPython codeArticleChikosha, S., Machaka, R., & Chikwanda, H. (2015). Evaluating the Johanson theory for titanium powder. http://hdl.handle.net/10204/8610Chikosha, S, Ronald Machaka, and HK Chikwanda "Evaluating the Johanson theory for titanium powder." (2015) http://hdl.handle.net/10204/8610Chikosha S, Machaka R, Chikwanda H. Evaluating the Johanson theory for titanium powder. 2015; http://hdl.handle.net/10204/8610.TY - Article AU - Chikosha, S AU - Machaka, Ronald AU - Chikwanda, HK AB - Direct powder rolling (DPR)/roll compaction has been labelled a complex and sample sensitive process. As such the design of the instrument and the determination of the optimal processing conditions for a given feed are very challenging. The challenge is attributed to a wide range of operating parameters and material properties. Several theoretical models can be used to evaluate the interaction of the different parameters and properties and how their changes affect the rolling process. In this study, the Johanson theory was used to determine the rolling parameters of titanium powder. Preliminary results of the nip angle, nip pressures and maximum horizontal pressures of the mill for the powder rolled on a 55mm diameter roll with roll gap sizes of 0.175, 0.15 and 0.05 mm were obtained. The results were found to be acceptable for the nip angle estimation, however improvement on predicting the maximum horizontal pressure is required. DA - 2015-05 DB - ResearchSpace DP - CSIR KW - Direct powder rolling KW - Maximum pressure KW - Johanson theory KW - Titanium powder KW - iPython code LK - https://researchspace.csir.co.za PY - 2015 SM - 1662-9752 T1 - Evaluating the Johanson theory for titanium powder TI - Evaluating the Johanson theory for titanium powder UR - http://hdl.handle.net/10204/8610 ER -