Study of effect of roughness on hardness and p-h curve behavior

نوع: Type: thesis

مقطع: Segment: Masters

عنوان: Title: Study of effect of roughness on hardness and p-h curve behavior

ارائه دهنده: Provider: Masoud Shirazi

اساتید راهنما: Supervisors: Dr. Amir-Hossein Mahmoudi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Dr. Gholam-Hossein Majzoobi And Dr. Hashem Mazaheri

زمان و تاریخ ارائه: Time and date of presentation: 2/13/2022

مکان ارائه: Place of presentation: online

چکیده: Abstract: The spherical Indentation test is one of the non-destructive methods to attain the mechanical properties of materials that have been interested by many researchers. This test is a cheap and fast method that provides so much information for researchers with minimum side effects on the sample tests. In engineering, there is no completely flat surface and each surface has its own roughness. Roughness is always one of the effective and important parameters on the extracting of some mechanical properties and it has been investigated in various studies. Studies show that many mechanical properties such as elastic modulus, yield stress, hardness, etc. can be achieved by using the information of the indentation process, which is obtained from the load-displacement diagram. To estimate mentioned properties, a reliable load-displacement diagram should be used as input. In this thesis, the effect of surface roughness on the load-displacement diagram and hardness measurement has been studied. A rough surface was created on the samples by using Electrical Discharge Machining and Ultrasonic Shot Peening. Also, the Indentation process was simulated on different rough surfaces in ABAQUS CAE software. By performing indentation tests in both laboratory and simulations conditions at different penetration depths, it was observed that with increasing the roughness, the level of load-displacement diagrams decreased. Also with increasing roughness, the measured hardness value decreased. In another case, it was observed that, with increasing indentation depth, the effect of roughness on hardness measurement values reduced. Finally, according to the simulation and experimental results the roughness range of 2 micron and less, is considered as a reliable range of roughness to extract the load-displacement diagram.

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