Abstract
The main objective of this study is to measure the distribution of machining stress by the instrumented indentation test (IIT). Finite element method (FEM) was performed to investigate the influences of tensile stress and compression stress on the indentation response (Load-displacement curves, average contact pressure and contact area). The thicknesses of machining stress layer under turning and grinding processing ways were obtained by layer stripping method based on instrumented indentation technique. Results indicate that the machining stress brings complex stress state. Under the same load, the corresponding indentation displacement increases while the indentation plastic work, contact area and average contact pressure decrease with the increases of machining stress (from compressive stress to tensile stress). Tensile stress does just the opposite. In addition, the layer thicknesses of the machining stress for turning and grinding members were measured by instrumented indentation method, results agree with X-ray method and demonstrate the effectiveness of the proposed approach.
Highlights
Metal cutting process is very complicated, the residual stress will produce inside workpiece during the turning, grinding and other different cutting processes, which affects the mechanical properties of materials
It is observed that the indentation depth hm increases when machining stress turns from compressive stress to tensile stress
The test method of machining stress based on the instrumented indentation test is investigated
Summary
Metal cutting process is very complicated, the residual stress will produce inside workpiece during the turning, grinding and other different cutting processes, which affects the mechanical properties of materials. The interior or exterior residual stress of metal components has importance effect on mechanic performance [1]. That is the reason of residual stress caused by mechanical processing [2, 3]. Lots of residual stress measurement methods have been developed at present, familiar ones are hole drilling method and X-ray diffraction method [5]. These methods have certain damages to the specimen and they are relatively difficult to implement
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