Advanced composites are not without a trade-off. Their increased designability brings an increase in the complexity of their internal geometry and, as a result, possible modes of failure. When two or more isotropic materials are combined in a composite, the isotropic failure modes may also combine. In a laminate, matrix delamination, cracking and crazing, and voids and porosity, will often comb...

The edge waviness in hot rolled steel is a common defect. Variables that affect such defect include raw material and machine. These variables are necessary to consider to understand such defect. This research studied the defect of edge waviness for SS 400 of metal sheet manufacture. Defect of metal sheets were divided into two groups. The specimens were investigated on chemical composition and ...

Effective elastic properties for carbon nanotube reinforced composites are obtained through a variety of micromechanics techniques. An embedded carbon nanotube  in  a  polymer  matrix  and  its surrounding  interphase  is  replaced with an equivalent fiber for  predicting  the  mechanical  properties of  the  carbon  nanotube/polymer composite. The effects of an interphase layer between the nan...

A methodology was developed for the prediction of the electrical properties of carbon nanotube-polymer nanocomposites via Monte Carlo computational simulations. A two-dimensional microstructure that takes into account waviness, fiber length and diameter distributions is used as a representative volume element. Fiber interactions in the microstructure are identified and then modeled as an equiva...

The presence of fiber waviness defects is well-known to reduce the compressive strength. A FE model was established and results failure load mode were compared with test demonstrate validity accuracy. influence two parameters L offset Angle θ defect studied. simulation show that compression increases increasing at constant A/H for convex concave fold by 33.0% 20.1% respectively, but there no si...

In this study, the effect of rapid laser heating, which is typical during laser-assisted fiber placement (LAFP), on micro- and meso- structure thermoplastic tape was investigated. Thermoplastic tapes were heated above melting temperature with different lengths (30 80 mm heating times (0.2 0.8 s) in a dedicated experimental setup. In-situ ex-situ characterization techniques used to observe diffe...

A theoretical model for the edge image waviness effect is developed for the ground-to-ground imaging scheme and validated by use of IR imagery data collected at the White Sands Missile Range. It is shown that angle-of-arrival (AA) angular anisoplanatism causes the phenomenon of edge image waviness and that the AA correlation scale, not the isoplanatic angle, characterizes the edge image wavines...

In this paper the vibration signature of single walled carbon nano tube (SWCNT) with waviness along its axis which is doubly clamped at a source and a drain and is used to represent a single mode resonator has been analyzed. In most of previous study, experimentally measured resonance frequencies of CNTs along with classical beam theory for straight beams CNT have used. However, from photo micr...

It is well established that fiber waviness in continuous fiber-reinforced polymer composites a defect rather than an aesthetic flaw, as it potentially leads to severe knockdown of the mechanical properties. Consequently, desirable minimize or prevent during processing. This research explored experimentally influence tool material, release media and laminate size on formation in-plane C/PEEK con...