Design Of Reliable And Effective Damage Detection Techniques

However, the absence of plastic deformation does not mean that composites are brittle materials like monolithic ceramics. The heterogeneous nature of composites result in complex failure mechanisms which impart toughness. Fiber-reinforced materials have been found to produce durable, reliable structural components in countless applications. The unique characteristic of composite materials, especially anisotropy, require the use of special design

The use of fiber reinforced composites materials as an alternative to traditional metal materials is becoming widespread. The main technological advantages of these materials are low weight, high specific strength and stiffness, environmental resistance and long life. Compared to metals, composites can be easily made by relatively low tooling cost. Polymer matrix reinforced by woven fabrics is probably the most commonly used form of composites in structural application such as aircrafts, boats, and automobiles

Composite materials have been evaluated with a matrix properties unsaturated polyester resin by conducting mechanical testing, including the pressure, compression, hardness and impact resistance.. While wood flour helped add to the balance between the original compression strength reductions up to 3 wt. wood flour and then reduce the strength. The results confirmed that the best promote and 3% by weight of wood flour consider the compression strength

Composite structures have been around since the beginning of time, but the modern day uses were first applied during World War II. Composites such as rubber tires and glass were used in structures where metal or other material structures could not be applied. The past few years, composite material structures have been used more in aircraft structures than any other time in the history of man. The main reason is that the understanding and technology are at a point were composite structures could be applied in greater use due to human understanding. Composite structures in aircraft are becoming more practical for more applications. This is based on the how/why composites are being applied, the benefits of composites, the problems/ failures of

The building materials available to engineers today are vastly improved over those of the past. One class which has seen wide spread usage in many fields are composites. These new materials first appeared on the aerospace scene in the early 1970’s, for these materials were found to provide many benefits over the previous metal-based designs.

This paper discusses the different properties of composite materials under static testing condition to determine the effect of aging due to change in temperature and moisture content. Effects on tensile, shear, impact, stiffness and fatigue parameters are studied. For each property, application specific composite materials are taken into consideration with different stacking sequence and number of plies. Different samples of these are then introduced to different hygrothermal environments for example: temperatures ranging from -50 degree Celsius to +50 degree Celsius or kept in wet conditions for 24 hours at different temperatures of 21, 37 and 50 degree Celsius etc. Different tests are performed based on the material property to observe a change from the initial unaged specimen. To study every property a different test method is discussed. A final comparison for each property between the unaged and aged specimen is shown in order to see the property’s dependence on temperature and moisture. This comparison highlights the temperature and moisture dependent properties and showcase a trend. Properties like tensile modulus, shear modulus, shear strength, flexural stiffness and fatigue life show a decrease with increase in temperature and moisture content while Poisson’s ratio and impact strength increase with increase in temperature and moisture content.

Principal Investigator Dr. Roy Xu (US citizen) worked as an aerospace structural engineer in China. He came to the US and received his Ph.D. in Aeronautics and Materials Science from California Institute of Technology in 2002. He started his interdisciplinary faculty career as a civil engineering faculty at Vanderbilt University, and a mechanical and aerospace engineering faculty at University of Texas at El Paso and New Mexico State University (NMSU). His honor and award include an Office of Naval Research (ONR) Young Investigator Award in 2003, and a Fellow of the American Society of Mechanical Engineers (ASME) in 2012. He is the Chair of the ASME Fracture and Failure Mechanics Technical Committee. As an author of 46 journal papers,

Design technicians and engineers love to use carbon fibre in manufacturing as it has many desirable properties. First of all is its strength. Carbon fibre is five times stronger than steel and is twice as stiff [2]. The strands of carbon are lined up parallel to each other when producing a sheet. For maximum results in strength, the fibres must be parallel with the forces that will act upon that element, this is to make sure it can withstand the forces going through the object when in use.

Composite materials are multiphase materials obtained through the artificial combination of different materials in order to attain properties that the individual components by themselves cannot attain. They are not multiphase materials in which the different phases are formed naturally by reactions, phase transformations, or other phenomena. An example is carbon fiber reinforced polymer. Composite materials should be distinguished from alloys, which can comprise two more components but are formed naturally through processes such as casting. Composite materials can be tailored for various properties by appropriately choosing their components, their proportions, their distributions, their morphologies, their degrees of crystallinity, their crystallographic textures, as well as the structure and composition of the interface between components. Due to this strong tailor ability, composite materials can be designed to satisfy the needs of

Piezoelectricity is the capacity of particular materials to produce an electrical charge when they undergo mechanical stress and vice versa. This characteristic enables piezoelectric materials to be effective actuators, sensors and transducers used in aviation, autmobile and health sectors. Piezoelectricity is known to be a reputable and secured technology

Composite materials are the engineering materials made from two or more constituent materials they remain separate and distinct on a macroscopic level but forming a single component or Composites can defined as materials that consist of two more chemically and physically different phases separated by a distinct interface(matrix phase and dispersed phase). The different systems are combined judiciously to achieve a component with more and more useful structural or functional properties non-attainable by any of the constituent alone. In the composites usually Matrix phase is the primary or base phase having a continuous character or continuous molecular chain. But these Matrixes are usually less hard and more ductile phase. In composites it holds the dispersed (reinforcing) phase, shares a load with it. The Dispersed phase is encapsulated in the matrix in a discontinuous form called a secondary phase. This Secondary phase

Composite materials are the engineering materials made from two or more constituent materials they remain separate and distinct on a macroscopic level but forming a single component or Composites can defined as materials that consist of two more chemically and physically different phases separated by a distinct interface(matrix phase and dispersed phase). The different systems are combined judiciously to achieve a component with more and more useful structural or functional properties non-attainable by any of the constituent alone. In the composites usually Matrix phase is the primary or base phase having a continuous character or continuous molecular chain. But these Matrixes are usually less hard and more ductile phase. In composites it holds the dispersed (reinforcing) phase, shares a load with it. The Dispersed phase is encapsulated in the matrix in a discontinuous form called a secondary phase. This Secondary phase is usually stronger than that of the matrix phase, so is also called as reinforcing phase.

Engineering demands innovation to survive the ever-changing desires of society. In civil engineering those desires revolve around creating unique, interesting structures that the public can enjoy both astatically and functionally. Carbon fiber is not a new technology, but its implementation into the structural designs of

Having these parameters, the re-entrant struts and vertical struts are designed in Solidworks and then assembled into lattice in Netfabb. Note that the entire lattice is divided into two material sets, so the

The major step of composite in automotive business is extension of use in to truly structural application such as primary body structure and to chassis and suspension system. These are the area which has to sustain all major road load