Accepted Manuscripts

Review Article  
Ala Tabiei and Wenlong Zhang
Appl. Mech. Rev   doi: 10.1115/1.4040448
Composite laminate has wide usage in aerospace and automotive industry. Thus delamination, one of its most prevalent and challenging failure mode, has attracted substantial research effort, and lead to the rapid development of both simulation and experiment method. Although reviews exist about simulation and experiment method, there is not many that covers the development in most recent five years. This paper is targeted to fill that gap. We covered a broad range of topic in delamination, from the basic delamination onset and propagation theories to complex loading scenarios like impact and fatigue loading. From a simulation point of view, virtual crack closure technique (VCCT) and cohesive zone model (CZM), two most famous methods of delamination modeling, are compared and elaborated. Their implementation techniques are discussed, and we hope to give not only a description of the implementations but also their merits and drawbacks. We also covered the failure mode of combined delamination and matrix cracking, which is prevalent in impact loading scenario. Simulation techniques along with the failure mechanisms are presented. From experiment point of view, the discussed topics ranging from the basic delamination fracture toughness tests under static, dynamic or cyclic loading condition, to impact tests that aim to obtain the impact resistance and residual strength after impact. We hope to provide readers a useful collection of recent experiment data, and information about test method development.
TOPICS: Composite materials, Laminates, Simulation, Delamination, Failure mechanisms, Fracture (Process), Modeling, Fracture toughness, Impact testing, Cracking (Materials), Fracture (Materials), Aerospace industry, Automotive industry, Fatigue
Review Article  
Wei Cai, Wen Chen, Jun Fang and Sverre Holm
Appl. Mech. Rev   doi: 10.1115/1.4040402
This paper aims at presenting a survey of the fractional derivative acoustic wave equations, which have been developed in recent decades to describe the observed arbitrarily frequency-dependent attenuation and scattering of acoustic wave propagating through complex media. The derivation of these models and their underlying elasto-viscous constitutive relationships are reviewed, and the successful applications and numerical simulations are also highlighted. The different fractional derivative acoustic wave equations characterizing viscous dissipation are analyzed and compared with each other, along with the connections and differences between these models. These model equations are mainly classified into the two categories: the temporal and spatial fractional derivative models. The statistical interpretation for the range of power-law index is presented with the help of Lévy stable distribution. In addition, the fractional derivative biharmonic wave equations governing the scattering attenuation are introduced and can be viewed as a generalization of viscous dissipative attenuation models.
TOPICS: Wave propagation, Scattering (Physics), Acoustics, Radiation scattering, Electromagnetic scattering, Modeling, Wave equations, Computer simulation, Waves, Energy dissipation

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