This paper presents a new micromechanical model for a collection of cohesive zone models embedded between each mesh of a finite element-type discretization. It aims to forth fully extend the previous linear results of [1] to the calibration of damageable cohesive parameters (cohesive peak stress, critical opening displacement, cohesive energy, etc). The main idea of the approach consists in rep...

In this paper, the mechanical behavior and damage evolution of CFRP laminates under three-point bending loads were investigated. Based on three-dimensional Hashin failure criterion cohesive zone method, a progressive analysis model was constructed to predict seven different modes, an improved stiffness matrix degradation law proposed. Numerical simulations performed using ABAQUS finite element ...

This study examines a new approach to facilitate the convergence of upcoming user-subroutines UMAT when secant material matrix is applied rather than conventional tangent (also known as Jacobian) matrix. algorithm makes use viscous regularization technique stabilize numerical solution softening models. The Newton–Raphson predictor-corrector ABAQUS then applies this type using only When time ste...

The process of ductile fracture which occurs due to the accumulation, growth and combination of defects or cracks of material is called ductile damage. Failure in materials can be predicted, using damage mechanics and damage criteria. On the other hand, most of the materials depended to the manufacturing process, are formed in warm or hot conditions so that; the temperature also affects on the ...

The rigidity of a network of elastic beams crucially depends on the specific details of its structure. We show both numerically and theoretically that there is a class of isotropic networks which are stiffer than any other isotropic network with same density. The elastic moduli of these stiffest elastic networks are explicitly given. They constitute upper-bounds which compete or improve the wel...

A combination of stiffness and loss (the product Etan ) is desirable in damping layer and structural damping applications. Composite materials of structure which gives rise to Reuss or Hashin–Shtrikman lower bound behavior can give rise to such properties. Hierarchical particulate morphologies attain the Hashin– Shtrikman curve. We show that hierarchical composites give rise to complex Poisson’...

Methods of damage development analyses for various types of composite materials such as 3-D woven composite have not been established sufficiently because it is quite difficult to simulate the failure propagation. A FEM simulation of failure process of 3-D composite was executed by Mibayashi including the thermal residual stresses after the curing process, and the deformations and stresses calc...

Recent technological advancements led to active research in the field of additive manufacturing (AM) thanks its ability fabricate complex structures with reduced material waste. While many studies focused on quasi-static performance AM materials and structures, investigations dynamic these are still limited, especially for polymers composites. The aim this is investigate fracture behaviour poly...

An interval-based method is presented to evaluate the uncertainty in computed mechanical properties and failure assessment of composite unidirectional (UD) laminates. The was applied two laminates: a carbon/epoxy glass/epoxy. UD lamina were derived using simplified micromechanical equations. level ±5% assumed for input constituents. global minimum maximum values an interval branch-and-bound alg...