On Measuring the Near-Tip Plastic Strain Singularity

[+] Author and Article Information
Sundar M. Kamath

I.B.M. General Technology Division, East Fishkill, NY 12533

Kyung S. Kim

Division of Engineering, Brown University, Providence, RI 02912

J. Appl. Mech 57(4), 901-905 (Dec 01, 1990) (5 pages) doi:10.1115/1.2897659 History: Received March 18, 1988; Revised July 27, 1989; Online March 31, 2008


A recently developed experimental method, stress intensity factor tracer, is extended to measure the strength, J , of the HRR singularity for near-tip plastic deformation. Focal-plane mapping of the HRR field shows that the light intensity, I , collected on a finite area of the focal plane has a simple relationship with J as I = βJ 2n/(2n+1) . The constant, β, is a product of several experimental parameters and “n ” is the hardening parameter of a power-law hardening material. The focal-plane mapping technique is also capable of estimating the shape and size of the HRR-field dominant region for a relatively thin (<10mm) metallic specimen. In addition, a continuous trace of the J variation can be monitored using a single, stationary photodetector. Because the measurement value of this method is independent of crack-tip motion, the transition of HRR singularity from stationary to moving can also be studied. In this paper, the theoretical analysis of the method is presented.

Copyright © 1990 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.






Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In