Jurnal Tribologi 38 (2023) 69-81 Received 21 September 2022; received in revised form 27 November 2022; accepted 5 February 2023. To cite this article: Ammarullah et al. (2023). Relationship between deformation and running-in wear on hard-on-hard bearings from metal, ceramic, and diamond materials for total hip prosthesis. Jurnal Tribologi 38, pp.69-81. Relationship between deformation and running-in wear on hard- on-hard bearings from metal, ceramic, and diamond materials for total hip prosthesis Muhammad Imam Ammarullah 1,2,3* , Taufiq Hidayat 4 , M. Danny Pratama Lamura 3,5 , J. Jamari 3,5 1 Department of Mechanics and Aerospace Engineering, College of Engineering, Southern University of Science and Technology, Shenzhen, 518055 Guangdong, CHINA. 2 Biomechanics and Biomedics Engineering Research Centre, Universitas Pasundan, Bandung, 40153, West Java, INDONESIA. 3 Undip Biomechanics Engineering & Research Centre (UBM-ERC), Universitas Diponegoro, Semarang 50275, Central Java, INDONESIA. 4 Department of Mechanical Engineering, Faculty of Engineering, Universitas Muria Kudus, Kudus 59324, Central Java, INDONESIA. 5 Department of Mechanical Engineering, Faculty of Engineering, Universitas Diponegoro, Semarang 50275, Central Java, INDONESIA. * Corresponding author: imamammarullah@gmail.com KEYWORDS ABSTRACT Deformation Running-in wear Hard-on-hard Bearing Total hip prosthesis Since polyethylene wear particles reduce the lifetime of the total hip prosthesis in hard-on-soft bearing couples, hard-on-hard applications are more promising. Running- in wear evaluation can be the basis for determining the material selection for the hard-on-hard bearing couple. In addition, each material for hard-on-hard has a different magnitude of deformation during loading conditions. The current work gains an in-depth understanding relationship between deformation and running-in wear on three different hard materials: metal, ceramic, and diamond for use in hard-on-hard bearing couples. Computational study with a two-dimensional finite element-based model has been chosen to obtain the deformation of hard-on-hard bearing couples under simulated walking conditions and then compared with the running-in linear and volumetric wear to understand the relationship. The results show that with less deformation the hard-on-hard bearings exhibit lower running-in linear and volumetric wear.