The Woodruff School

SUMMARY

The work focuses on the fretting damage analysis via Finite Element Analysis (FEA) method. The 2D and 3D models are built. The fretting motions are between identical steels and between special alloys. Inconel 617 and Incoloy 800H are investigated. Both the displacement-controlled and the load&displacement controlled models are investigated. Different coefficient of frictions, normal loads, and tangential loads are input. The distribution of von-Mises stresses, plastic strains, evolution of the tangential force, junction growth, scars on the deformed contacting surfaces, and work done to the systems during the fretting motions are obtained. The Arhcard wear model and Adhesion model are planned to be applied to the interface. Theoretical equations for the initiation of gross slip and wear volume are planned to be derived with constant COF. The influence of the plasticity on the wear volume and stress distribution will be investigated. The FEA results in 3D between special alloys are planned to be compared with those from experiments (done by another group at Purdue University). A scheme of results normalization is proposed and it is shown to be effective for different material pairs. The results add insight to the damage behavior of fretting fatigue and wear.

SUBJECT:	Ph.D. Proposal Presentation

BY:	Huaidong Yang

TIME:	Thursday, April 4, 2019, 10:00 a.m.

PLACE:	MRDC Building, 4211

TITLE:	A Finite Element Fretting Analysis of Cylindrical and Spherical Contacts at Room and High Temperatures

COMMITTEE:	Dr. Itzhak Green, Chair (ME) Dr. Jeffrey Streator (ME) Dr. Michael Varenberg (ME) Dr. Richard W.Neu (MSE) Dr. Robert L. Jackson (University of Auburn)

SUMMARY The work focuses on the fretting damage analysis via Finite Element Analysis (FEA) method. The 2D and 3D models are built. The fretting motions are between identical steels and between special alloys. Inconel 617 and Incoloy 800H are investigated. Both the displacement-controlled and the load&displacement controlled models are investigated. Different coefficient of frictions, normal loads, and tangential loads are input. The distribution of von-Mises stresses, plastic strains, evolution of the tangential force, junction growth, scars on the deformed contacting surfaces, and work done to the systems during the fretting motions are obtained. The Arhcard wear model and Adhesion model are planned to be applied to the interface. Theoretical equations for the initiation of gross slip and wear volume are planned to be derived with constant COF. The influence of the plasticity on the wear volume and stress distribution will be investigated. The FEA results in 3D between special alloys are planned to be compared with those from experiments (done by another group at Purdue University). A scheme of results normalization is proposed and it is shown to be effective for different material pairs. The results add insight to the damage behavior of fretting fatigue and wear.