ISSN:
1432-0924
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract A boundary element method based numerical model is presented to simulate the nonlinear fracture process zone in cementitious materials. A cohesive type stress-separation constitutive relationship (σ-w curve) is incorporated in the model to represent the process zone. Numerical algorithms for both force-controlled (prescribed loading history) and crack-tip-control-led (prescribed crack tip position) are implemented to allow whole range simulations, including strain-softening and snap-back behavior. The numerical program includes special features to permit re-adjustment of nodal points such that accurate determination of the crack-tip position is achieved. A series of numerical simulations on both 3-point beams and double cantilever beams (DCB) are conducted to investigate the development of the inelastic process zone with respect to load level, loading configuration, specimen size, and the stress-separation relationship in the process zone. Size effect on fracture resistance is clearly demonstrated. Conclusions are drawn regarding the importance of determining the details of σ-w curve (i.e., the values of f t and w c )and the need for re-evaluating the R-curves approach in cementitious materials.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00350169
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