The accurate prediction of rock cutting forces of disc cutters is crucial for tunnel boring machine (TBM) design and construction. Disc cutter wear, which affects TBM penetration performance, has frequently been found at TBM sites. By considering the operating path and wear of the disc cutter, a new model is proposed for evaluating the cutting force and wear of the disc cutter in the tunneling process. The circular path adopted herein, which is the actual running path of the TBM disc cutter, shows that the lateral force of the disc cutter is asymmetric. The lateral forces on the sides of the disc cutter are clearly different. However, traditional solutions are obtained by assuming a linear path, where the later forces are viewed as equal. To simulate the interaction between the rock and disc cutter, a simple brittle damage model for rock mass is introduced here. Based on the explicit dynamic finite element method, the cutting force acting on the rock generated by a single disc cutter is simulated. It is shown that the lateral cutting force of the disc cutter strongly affects the wear extent of disc cutter. The wear mechanism is thus underestimated by the classical model, which was obtained by linear cutting tests. The simulation results are discussed and compared with other models, and these simulation results agree well with the results of present ones.

Analysis on the Rock–Cutter Interaction Mechanism During the TBM Tunneling Process

Development of a prediction model for the wear evolution of disc cutters on rock TBM cutterhead

What features are needed in a fretting fatigue test

Fretting is a special type of wear, which appears at the contact interface between two solids subjected to constant normal load and periodic tangential forces Although most studies on fretting have been executed experimentally, some approaches for simulating fretting wear have also been introduced during the last decades In particular, fretting wear analysis is concerned with the evolution of the surface profiles of the contacting bodies due to wear, and its modeling was executed using numerical, finite-element, semi-analytical and analytical methods, including the method of dimensionality reduction In the present review we discuss recent analytical results on fretting wear contact geometry adaptation

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Contact Geometry Adaptation in Fretting Wear: A Constructive Review

The paper presents a review of the current state of research in the field of discrete contact mechanics, including the main approaches to the formulation of problems, methods of analytical and numerical solution, the results, and the field of their practical use. It is intended for specialists in contact mechanics and tribology and may also be useful to researchers interested in controlling the interaction of deformable bodies due to the engineering of their surfaces.

A.P. Goryachev

Papers

The wear contact problem with partial slippage

Contact problems of the sliding of a punch with a periodic relief on a viscoelastic half-plane☆