ISSN:
1573-2673
Keywords:
Dynamic crack propagation
;
stress intensity factor
;
crack velocity
;
crack acceleration
;
caustic method
;
high-speed photography
;
PMMA.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Dynamic fracture in PMMA was studied to determine the correlations among dynamic stress intensity factor K ID, crack velocity $$ \dot a $$ and acceleration ä. Specimen geometry, a single-edge-cracked tensile plate with two circular holes, was employed to obtain the crack acceleration, deceleration and re-acceleration process in a single fracture event. K ID was evaluated using the method of caustics in combination with a Cranz-Schardin high-speed camera and correlated with $$ \dot a $$ and ä. The behaviors of K ID $$ \dot a $$ and ä in a SEN specimen were also examined, and the following correlations were obtained: (1) K ID was an increasing function of $$ \dot a $$ , but their relation was not unique. (2) K ID for a constant velocity $$ \dot a $$ was larger when the crack was decelerated than when it was accelerated. (3) K ID was dependent on both $$ \dot a $$ and ä, and K ID for ä=constant could be uniquely related to $$ \dot a $$ .
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007654002732
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