This article deals with the formulation of wear behaviours of nickel-free stainless steel/hydroxyapatite bio-composites that were tested in air and Ringer's physiological solution. The model is based on experimental data related to wear tests of the composites with various hydroxyapatite contents under various wear loads and distances. The wear load, hydroxyapatite volume fraction, and wear distance were considered as the independent variables (input para-meters) and the wear volume loss as the target value (output parameter) to develop a database. A non-linear regression procedure based on simulated surface methodology was employed to develop an approximate formula for predicting the wear volume loss. The results obtained by formulation were compared with the results achieved from experiments for investigating their accuracy and agreement. Then, the formula was used for determining the wear volume loss sensitivity of the composites related to each effective parameter (wear load, hydroxyapatite content, and wear distance) on the wear behaviour of the composites. The results were presented by plots and graphs herein. Generally, this formula describes the wear behaviour of nickel-free stainless steel-hydroxyapatite bio-composites with good precision.
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