ISSN:
1573-2673
Keywords:
Dynamics
;
roughness
;
stress intensity
;
crack velocity
;
acceleration
;
high speed photography
;
caustic method
;
photoelastic 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 evolution of roughness RMS during dynamic fracture in thin plates of epoxy (Araldite B) was studied in relation to important fracture parameters such as crack velocity a, acceleration and deceleration ä and mode I stress intensity factors ( KID ). Dual-focus high speed photography was carried out to evaluate values of KID by the caustic ( KID ( C ) ) and photoelastic ( KID ( P ) ) methods simultaneously. A specially designed jig applied successive tensile loadings to specimens which resulted in cyclic change of a and ä. The changes of a, RMS and KID are shown to be qualitatively similar with respect to the value of a. Quantitatively, a typical result showed that the position of the first maximum value of a came 7 mm behind the first loading axis, while that of KID ( P ), RMS and KID, ( C ) appeared on the fracture surface 7 mm, 15 mm, and 25 mm behind the axis, respectively. The agreement between KID ( C ) and KID ( P ) was acceptable except for data around the first loading axis. Discussions are given on the uniqueness problem of a and KID.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007443419107
Permalink
