BEM analysis of crack onset and growth in composites using the linear elastic–brittle interface model

2010 ◽  
pp. 281-293
Author(s):  
L. Távara ◽  
V. Mantič ◽  
J. Cañas ◽  
E. Graciani ◽  
F. París
Keyword(s):  
Interface Model ◽  
Linear Elastic

Revisiting the Problem of Debond Initiation at Fibre-Matrix Interface under Transversal Biaxial Loads - A Comparison of Several Non-Classical Fracture Mechanics Approaches

2016 ◽  
Vol 713 ◽  
pp. 232-235 ◽  
Author(s):  
L. Távara ◽  
I.G. García ◽  
Roman Vodička ◽  
C.G. Panagiotopoulos ◽  
Vladislav Mantič
Keyword(s):  
Fracture Mechanics ◽  
Cohesive Zone Model ◽  
Failure Criteria ◽  
Transverse Load ◽  
Zone Model ◽  
Interface Model ◽  
Matrix Interface ◽  
Linear Elastic ◽  
Energetic Approach ◽  
Fibre Matrix

Understanding matrix failure in LFRP composites is one of the main challenges when developing failure criteria for these materials. This work aims to study the influence of the secondary transverse load on the crack initiation at micro-scale. Four non-classical approaches of fracture mechanics are used to model the onset of fibre-matrix interface debonds: Linear Elastic Brittle Interface Model (LEBIM), an Energetic Approach for the Linear Elastic Brittle Interface Model (EA-LEBIM), an Energetic Approach for the bilinear Cohesive Zone Model (EA-CZM) and the Coupled Criterion of the Finite Fracture Mechanics (CC-FFM). Results obtained by these approaches predict that, for brittle fibre-matrix configurations, a secondary transverse compression reduces the critical value of the main transverse tension leading to the debond onset. This fact is not taken into account by the currently used failure criteria

Convergence of the BEM Solution Applied to the CCFFM for LEBIM

2018 ◽  
Vol 774 ◽  
pp. 355-360 ◽  
Author(s):  
M. Muñoz-Reja ◽  
L. Távara ◽  
Vladislav Mantič
Keyword(s):  
Fracture Toughness ◽  
Crack Propagation ◽  
Interface Fracture ◽  
Displacement Curve ◽  
Interface Model ◽  
Linear Elastic ◽  
Finite Fracture Mechanics ◽  
Interface Fracture Toughness ◽  
Elastic Interface ◽  
Coupled Criterion

A procedure based on the Linear Elastic Brittle Interface Model (LEBIM) combined with the Coupled Criterion of Finite Fracture Mechanics (CCFFM) is successfully implemented in a 2D Boundary Element Method (BEM) code. In the original LEBIM formulation, the values of the interface strength, fracture toughness and stiffness are dependent on each other. Therefore, for a large interface stiffness, when the elastic interface tends to a perfect (infinitely stiff) interface, LEBIM is not able to properly characterize the crack propagation. The use of the CCFFM applied to LEBIM, with both the stress and energy criteria imposed as independent fracture conditions, allows to uncouple the interface fracture toughness and strength, obtaining realistic predictions for crack propagation even for stiff interfaces. This code is successfully applied to the problem of debond onset and growth in the pull push test. A benchmark problem is solved, focusing on the convergence of the load-displacement curve and crack-tip solution for h-refinements of BE meshes.

Modeling the Tensile Behavior of the Cement-Bone Interface Using Nonlinear Fracture Mechanics

1997 ◽  
Vol 119 (2) ◽  
pp. 175-178 ◽  
Author(s):  
K. A. Mann ◽  
F. W. Werner ◽  
D. C. Ayers
Keyword(s):  
Fracture Mechanics ◽  
Yield Strength ◽  
Marked Effect ◽  
Interface Model ◽  
Structural Stiffness ◽  
Nonlinear Fracture Mechanics ◽  
Bone Interface ◽  
Linear Elastic ◽  
Nonlinear Fracture ◽  
Nonlinear Interface

The tensile mechanical behavior of the cement-bone interface where there was a large process (plastic) zone at the interface was modeled using a nonlinear fracture mechanics approach. A finite element method was employed, which included a piecewise nonlinear interface, to investigate the behavior of experimental cement-bone test specimens and an idealized stem-cement-bone (SCB) structure. The interface model consisted of a linear elastic region with high stiffness until the yield strength was reached, followed by an exponential softening region, until zero stress. The yield strength and rate of exponential softening after yielding at the cement-bone interface were shown to have a marked effect on the structural stiffness of the SCB model. The results indicate that both yield strength and postyield behavior should be included to characterize the mechanics of the cement-bone interface fully.

scholarly journals A linear elastic-brittle interface model: application for the onset and propagation of a fibre-matrix interface crack under biaxial transverse loads

2015 ◽  
Vol 195 (1-2) ◽  
pp. 15-38 ◽  
Author(s):  
Vladislav Mantič ◽  
Luis Távara ◽  
Antonio Blázquez ◽  
Enrique Graciani ◽  
Federico París
Keyword(s):  
Interface Crack ◽  
Interface Model ◽  
Matrix Interface ◽  
Model Application ◽  
Linear Elastic ◽  
Transverse Loads ◽  
Fibre Matrix
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