NDLI: The effects of artificial asperities on crack closing behavior in quenched and tempered medium carbon steel

Content Provider	Springer Nature Link
Author	Okayasu, Mitsuhiro Wang, Zhirui
Copyright Year	2012
Abstract	To better understand the effect of an asperity on crack closure behavior, K-CMOD relations were examined using artificial asperity/wedge, inserted into the fatigue crack in a three point bending specimen made of a hardened medium carbon steel. Experimental results revealed that the unloading phase of the K vs. CMOD curve exhibited a concave shape if soft artificial asperity (Al alloy) was inserted, signifying acceleration in the CMOD decrease at zero applied load. This was mainly related to elastic and plastic deformation in the wedge material during the unloading process. On the contrary, the linear unloading portion of K vs. CMOD was obtained as hard asperity (high carbon steel) was employed, which specified deceleration in the CMOD decrease at zero applied load, where the only elastic deformation in the asperity was affected. From their unloading curves, the severity of crack closure or ΔK $_{eff}$ value was found to be related to the strength of the asperity material. The values of ΔK $_{eff}$ were examined in two different ways, e.g., (i) the remote displacement method and (ii) the adjusted compliance ratio method (ACR). The ΔK $_{eff}$ value, measured using both approaches, decreases with increasing wedge strength, such as hardness and yield strength. The rate of reduction in ΔK $_{eff}$ was, however, changed depending on the manner of ΔK $_{eff}$ examination, in which the ΔK $_{eff}$ decreased at a higher rate for the compliance ratio method and at a lower rate for the remote displacement method. The reason for this is discussed in the present work.
Starting Page	3081
Ending Page	3090
Page Count	10
File Format	PDF
ISSN	1738494X
Journal	Journal of Mechanical Science and Technology
Volume Number	26
Issue Number	10
e-ISSN	19763824
Language	English
Publisher	Korean Society of Mechanical Engineers
Publisher Date	2012-11-21
Publisher Place	Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Artificial asperity Crack closure SAE1045 CMOD Crack closure model Vibration, Dynamical Systems, Control Mechanical Engineering Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Mechanical Engineering

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