ISSN:
1573-2673
Keywords:
integro-differential equations in space and time
;
numerical algorithm
;
cohesive fracture
;
rate-effect
;
viscoelasticity
;
creep
;
quasibrittle materials
;
concrete
;
numerical algorithm
;
scaling
;
size effect
;
analysis of test data.
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract In the preceding companion paper (Bažant and Li, 1995), the solution of an aging viscoelastic law was structure containing a cohesive crack with a rate-dependent stress-displacement softening law was reduced to a system of one-dimensional integro-differential equations involving compliance functions for points on the crack faces and the load point. An effective numerical algorithm for solving these equations, which dramatically reduces the computer time compared to the general two-dimensional finite element solution, is presented. The behavior of the model for various loading conditions is studied. It is shown that the model can closely reproduce the available experimental data from fracture tests with different loading rates spanning several orders of magnitude, and tests with sudden changes of the loading rate. Influence of the loading rate on the size effect and brittleness is also analyzed and is shown to agree with experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1007497104557
