A. A. Deshpande, S. B. Leen, T. H. Hyde, University of Nottingham, Nottingham, United Kingdom
SPF tool distortion due to the thermal cycling and cyclic creep can lead to the forming of faulty SPF parts. In addition, thermo-mechanical fatigue and creep can cause cracking, which eventually lead to un-repairable damage to the tool. The aim of the present research work is to develop a generic methodology for predicting the distortion behaviour of large aerospace SPF tools, made from 40% nickel, 20% chromium alloys. Initially FE modelling of the SPF process is performed under realistic forming conditions to understand distortion behaviour of a large representative SPF tool. Progressive distortion of the tool due to creep relaxation during forming cycle (dwell period) is predicted. Thermo-mechanical fatigue-creep interaction tests and high temperature creep tests are designed and carried out based on FE predicted results. FE predictions and experimental results are compared and analysed. Factors affecting tool distortion such as heating and cooling cycles, heating and cooling rates and the batch size are studied to optimize the SPF process.
Summary: This is Aditya Deshpande from University of Nottingham. I am doing PhD in mechanical enginnering. My research topic is 'Life limiting behaviour of large SPF tool using FE analysis and TMF testing.'
The aim of my presentation is to develop a generic methodology for predicting distortion behaviour of large SPF tool using FE analysis and thermo-mechanical fatigue and fatigue-creep interaction tests.
