Ultrasonic damage detection and characterization is commonly used in nondestructive evaluation (NDE) of aerospace composite components. In recent years there has been an increased development of guided wave based methods. In real materials and structures, these dispersive waves result in complicated behavior in the presence of complex damage scenarios. Model-based characterization methods utili...

The nite element method (FEM) has proven to be a popular spatial discretization technique in the simulation of complex physical systems in many areas of science and engineering. Implicit solution schemes, used in the time discretization, require the application of the inverse of an operator which is usually linear or linearized; thus, after the FEM discretization, a linear set of discrete equat...

In this study, the stress distribution in the shrinkage process when a light-cured composite resin is irradiated with light was estimated. We assumed that shrinkage and hardening of the light-cured composite resin resulted from light irradiation and was the same as that caused thermally. On the basis of this assumption, we simulated the deformation during the shrinkage of the composite resin us...

Ceramic matrix composites (CMCs) are currently being considered for applications in the hot-section components of aviation gas turbines owing to their favorable characteristics. Herein, a micromechanical modeling is presented orthogonal 3 D woven CMCs under in-plane loading. The three-dimensional effective compliance composite was derived using laminate theory and continuum damage mechanics. va...

Delamination caused by low velocity impact is one of the most frequent cases of damage in sandwich composite materials. When delamination is present the ability of the material to withstand structural loading is limited [1, 2]. In many cases, a local repair of a damaged sandwich structure is preferable over replacement for economical, mechanical and environmental reasons. Bonded repairs are wid...

Multidirectional composite laminates have been increasingly used as primary load-bearing structures in many applications such as aircraft frames, wings, and turbine or wind-mill blades, owing to their excellent weight-to-strength ratios, better environmental resistance, and much improved long-term durability. Such highperformance polymer matrix composites typically consist of dozens of unidirec...

In this paper, a general elastoplastic-damage constitutive model considering the effect of strain rate has been developed. The derivation of this model has been cast into the irreversible thermodynamics with internal variables within the fundamentals of Continuum Damage Mechanics (CDM). The rate effect has been involved as an additional term into the plastic yield surface (dynamic plastic yield...

In this paper, a multi-scale coupling mathematical model is suggested for simulating the polymer filling process in weld line region on micro scale. The considers two aspects: one based stresses whole cavity region; other of continuum mechanics (CM) and molecular dynamics (MD) weldline region. A weak variational formulation constructed finite element method (FEM), which coupled with Verlet algo...