ISSN:
1573-2673
Keywords:
Dynamic crack propagation
;
unloading behavior
;
stress intensity factor
;
crack velocity
;
unloading rate
;
brittle polymers
;
epoxy
;
PMMA
;
homalite-100
;
caustic method.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The method of caustics in combination with a Cranz–Schardin high-speed camera was utilized to study dynamic crack propagation and unloading behavior of epoxy, PMMA and Homalite-100 specimens. Dynamic stress intensity factor K ID and crack velocity $$\dot a$$ were evaluated in the course of crack propagation. Caustic patterns at the loading points were also recorded to estimate load P applied to the specimen. Unloading rate $$\dot P$$ , the time derivative of P, was determined as a function of time t, and its time correlation with K ID or $$\dot a$$ was examined. The findings showed that the change in $$\dot P$$ was qualitatively in accord with the change in K ID or $$\dot a$$ . However, there existed slight differences among the values of t giving the maximum $$\dot P$$ , $$\dot a$$ and K ID, so that their order was $$\dot a$$ , $$\dot P$$ and K ID.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1018697630909
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