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Peeling of composite sandwich structure yang sebenar
peeling of composite sandwich structure(c.s.s )<br />
Group presenter and supervisor<br />SUPERVISOR : <br />DR ZAHURIN BINTI HALIM<br />PRESENTER : <br />1) NURUL NAJWA AHMAD 0822450<br />2) SITI NORAINI KAWAEED 0724126<br />3) MOHD BUKHARI YAHYA 0827361<br />
definitions<br /><ul><li>PEELING : A piece or strip, as of skin or vegetable rind, that has been peeled off.
COMPOSITE : Made up of distinct components; compound.</li></li></ul><li>CONTINUE..<br />SANDWICH : A laminar construction, consisting of thin facings bonded to a relatively thick lightweight core,resulting in a rigid and lightweight panel. In this standard, bonded means “joined by welding, brazing or adhesive. ”<br />STRUCTURE :<br />1. Something made up of a number of parts that are held or put together in a particular way<br />2. The arrangement or formation of the tissues, organs, or other parts of an organism.<br />
Problem statement<br />Weak joints between an outer metal sheet and the core of sandwich assemblies.<br />Fracture toughness of the facesheet bond.<br />Crack defects<br />
introduction<br />A composite sandwich structures:<br />1) special class of composite materials <br />2) fabricated by attaching two thin but stiff skins to a lightweight but thick core. <br />
What is core?<br /><ul><li>A lightweight natural, synthetic, or fabricated material
bonded between the facings of sandwich construction
to support them against buckling under stress.</li></li></ul><li>review<br />Review of the current state of research related to the topic :<br /><ul><li>THE FLEXURAL BEHAVIOR OFCOMPOSITE SANDWICH STRUCTURE[MOHD HAKIMI BIN OMAR,2008]
COMPOSITE SANDWICH STRUCTURE WITH GRID STIFFENED CORE[VENKATA DINESH MUTHYALA,2005]
A TEST TECHNIQUE FOR ASSESSING CORE-SKIN ADHESION IN COMPOSITE STRUCTURES</li></li></ul><li> Types of composite sandwich structure <br />
PROCEDURETEST<br />Problems on the sandwich structure has been identified from the problem statement:<br />One of them is poor bonding face problem<br />In order to solve that problem, Climbing drum peel test is used in this case.<br />
Honeycomb is one of good core for composite sandwich structure.
Get the best strength of the weight ratios.</li></li></ul><li>How to repair the peeled section.<br />Cosmetic repair<br />>In this case inspection has determined that the damage has not affected the structural integrity of the component. A cosmetic repair is carried out to protect and decorate the surface. This will not involve the use of reinforcing materials.<br />
Structural repair<br />If the damage has weakened the structure through fibre fracture, delamination or disbonding the repair will involve replacement of the damaged fibre reinforcement, and core in sandwich structures to restore the original mechanical properties. <br />Since a bonded-on repair constitutes a discontinuity of the original plies, and therefore a stress raiser, structural repair schemes normally require extra plies to be provided in the repair area.<br />If the damaged area is very small it can be questionable whether a structural repair is required but more preferable to a cosmetic repair<br />
Patch repair<br />In this case the thickness of the original laminate is made up with filler plies and the repair materials are bonded to the surface of the laminate.<br />Advantages<br />> Quick and simple to do<br />>Requires minimum preparation<br />Disadvantages<br />>A repaired laminate is thicker and heavier than the original<br />>Very careful surface preparation is needed for good adhesion<br />