PSI - Issue 60

Nagaraja Bhat Y V et al. / Procedia Structural Integrity 60 (2024) 345–354 353 Y V N Bhat, M A Davinci, A Kumar, N L Parthasarathi, S I S Raj, D Samataray, B.K. Sreedhar / StructuralIntegrity Procedia 00 (2019) 000– 000 loss and wear diameter of the pin. For all the cases, specific wear coefficients lie in the order 10 -14 m 3 /N-m. Theoretical prediction of wear depth of the pin is carried out using GIWM and it is compared with the experimental results. In GIWM, prediction of wear depth is done using either Archard wear equation or the Sarkar wear model. From the theoretical prediction, following conclusions are made. • It is observed that, prediction from GIWM matches fairly good with experimental results at steady state region. This matching results also validate specific wear coefficient obtained from the experiment for given load condition in the steady state region. • In the running in region, predictions of pin wear depth using GIWM considering either Archard wear equation or Sarkar wear model are not matching with experimental results. • The reason for not matching theoretical result with experimental result at running in region is might be due to consideration of average contact stress in the GIWM instead actual case of varying contact stress across the contact area. Wear volume can be estimated from the cap formulae for spherical ended tip of pin as shown below =      where, V = Wear volume in ‘m 3 ’ h = Wear depth in ‘m’ R = Sphere radius of pin ‘m’ Here, ‘R’ is known and ‘h’ can be estimated from following equation =     Where ‘a’ is the radius of wear surface which can be measured using confocal microscope. Once ‘h’ wear depth is known, Wear volume V can be estimated using equation 17. Based on wear volume, using Archard wear equation “K H ” is estimated as shown in equation-19.   =    (19) Where, F = Applied normal force in’N’ S = Sliding distance in “m’ (17) (18) Wear volume can be estimated from pin weight loss using following equation =   Where, w = Weight loss in ‘kg’  = density of material in ‘kg/m 3 ’ Based on wear volume, using Archard wear equation “K H ” is estimated as shown in equation-19. (20) Appendix A. Estimation K H from wear radius and weight loss of pin A.1. From wear radius A.2. From weight loss of pin