Finite Element Implementation of Failure and Damage Simulation in Composite Plates
Continuum damage mechanics CDM proposed by Kachanov has shown that damage, similar to strain, can be a measure of characterizing material responses, and thus can be treated as an internal state variable. Continuum damage is considered as an average density of microcracks or microvoids over a certain volume in a body. Nonlinear responses of a material can be correctly described using the damage concept. Since late s, lots of researches have been successful in developing rational CDM model and its applications to engineering fields.
Among them is an analysis of a welded tubular joint of offshore platforms Jubran and Cofer, Other Resources.
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Basic governing equations of damage evolution and material constitutive relation are established considering random damage which conforms to a modified Weibull type distribution proposed in this paper. Calculation suggests that Weibull distribution can describe damage evolution of UHPCC and predict the constitutive relation and damage evolution equation. Abstract: The failure process for an extra-long pre-stressed concrete beam under static loads was simulated based on the elastic damage theory with the commercial software ABAQUS.
By taking account of the different damage behaviors of concrete under tension and compression conditions, a damage mechanics model with three independent parameters was derived from the elastic damage theory.
This method was developed to analyze the failure process of the extra-long pre-stressed concrete beams. The theoretical results show that the proposed damage constitutive model can be applied to describe the damage and fracture behaviors of the extra-long pre-stressed concrete beams.
Abstract: Fiber-reinforced composite materials FRC are used in a wide range of applications, since FRC exhibits higher strength-to-density ratio in comparison to traditional materials due to long fibers embedded in a matrix material. Failures occurred in FRC components are complicated because of the interaction of the constituents. The aim of this study is to investigate damage behavior in a unidirectional glass fiber-reinforced epoxy on both macro-and micro-levels by using finite element method.
The Hashins criterion was applied to define the onset of macroscopic damage.
Damage Mechanics-Finite Element Full-Couple Method to Predict the Fatigue Life of Metallic Material
The progression of the macroscopic damage was described using the Matzenmiller-Lubliner-Taylor model that was based on fracture energy dissipation of material. To examine the microscopic failure FE representative volume elements consisting of the glass fibers surrounded by epoxy matrix with defined volume fraction was considered. Elastic-brittle isotropic behaviour and the Coulomb-Mohr criterion were applied for both fiber and epoxy. This paper evaluates the effect of restricting CDM matrix crack development to discrete, fiber-aligned rows where the spacing of these rows is controlled by a user-defined crack spacing parameter.
Damage Mechanics with Finite Elements : Practical Applications with Computer Tools
Initially, the effect of incrementally increasing matrix crack spacing in a unidirectional center notch coupon is evaluated. Then, the lessons learned from the center notch specimen are applied to open-hole compression finite element models.
http://clublavoute.ca/dawek-horcajo-de.php Results are compared to test data, and the limitations, successes, and potential of the matrix crack spacing approach are discussed.