Dipl.-Ing. Parwiz Faqiri
Diplomprüfung: 11/2008
Diplomprüfung: 11/2008
The appliance of composite materials dates back to the ancient times when the combination of materials to form a new material sytem with improved material properties was employed. For example, the ancient Israelite worker under the slavery of the Pharaohs compounded chopped straw in bricks as a means of enhancing their structural integrity. The technique of Laminated Metal Composites (LMCs) was well known by the ancient Japanese Samurais and applied by using laminated metals in forging their swords to create a blade which had a unique hard and highly razor sharp cutting edge with an inner core which is resilient and able to absorb shocks in a way which reduces the possibility of the blade breaking or bending when used in combat. Another more recent invention, which strongly influenced our architecture construction, was made in 1848 by a French gardener named Joseph Monier who placed steel rebars in cement to make a material well known as reinforced concrete. With the introduction of the fibreglass polymer matrix during World War II by the United Kingdom a modern era began and the metallic structured material like steel, aluminum alloy and titanium began to get increasing competition by fibre reinforced composites.
The fabrication of the lamination build-up of Fibre-Reinforced-Plastic (FRP) pipes Type B with Polypropylene (PP) and Polyvinyl Chloride (PVC) liner according to DIN 16964 can be achieved in two different types of lamination methods. The first option is to reinforce the lamination with Fabric Tape. The second option is to reinforce the lamination with Unidirectional (UDI) and Roving.
The aim of this thesis is to analyse the mechancical properties of Unsaturated-Polyester-Fibreglass (UP-GF) Type B according to DIN 16964 "Pipes of glass fibre reinforced polyester resins; wound; general quality requirements and test methods". The Type B pipe consists of an inliner made from a thermoplast Polyvinyl Chloride (PVC) or Polypropylene (PP) for highly hazardous medium application and FRP surfacing for outer protection and mechanical strength enhancement. The material properties of FRP pipes depend strongly on the manufacturing process such as glass-ratio content, fibreglass alignment and lamination build up. In order to analyse the mechanical properties and to calculate the state of stresses in the lamination build-ups, a short time burst pressure test is conducted in an burst experimental set-up as shown in figure below. The quality and quantity of the glass content in ashing tests are determined. All raw materials such as woven glass fabrics reaction resins and reactants are tested for quality. The two lamination methods are evaluated in reflection of economic effciency and the Break-Even-Point are calculated.