chapter  3
102 Pages

Stress, Deformation, and Strength of Sandwich Reinforced Thick-walled Pipes with Regard to Change of Physico–Chemical Properties of Binder

Regard to Interaction Forces with Elastic Medium .......... 169 3.2.2 Elastico-Plastic Properties of a Bundle from Fibers

with Regard to Interaction Force with Elastic-Plastic Matrix ....................................................... 181

3.2.3 Visco-Elastic Properties of a Bundle from Fibers with regard to Interaction Forces with a Visco-Elastic Matrix ........................................................ 193

3.2.4 On an Approximate Visco-Elastic Model of a Polymerized Bundle from Fibers with regard to Interaction Forces with Viscous-Elastic Matrix ........... 201

3.3 Experimental Investigations of Mechanical Properties of Bundles Made up of Glass Fibers in Quasistatic Interaction with a Polymer Matrix ................................................................. 206

3.4 Physico-Mechanical Deformation Model of a Polymerized Bundle From Fibers in the Neck Zone ......................................... 212 3.4.1 Experimental-theoretical method for defining mechanical

characteristics of a polymerized bar made of fibers )(xE f , )(xνλ , )(xτλ and the neck zone ....................... 217

3.5 Experimental-Theoretical Method for Defining Physico-Mechanical Properties of a Polymerized Bundle from Fibers With Regard to Change of Physico-Chemical Properties of a Binding Material ................... 226 3.5.1 A way for experimental definition of elastic constants of

a polymerized filament )(λfE , ⊥′ν , ⊥′′ν , )(λfE , fα with regard to swelling effect of a binding material. ................ 235

3.6 Stress-Strain State of a Sandwich-Reinforced Pipe Under the Action of Corrosive Liquid Medium and the System of External Loads ......................................................................... 242

3.7 Stress-Strain State of a Three-layer Reinforced Pipe Under the Action of Internal Pressure and Axial Tension With Regard to Physico-Chemical Change of the Binding Material .................... 256

Keywords .............................................................................................. 259 References ............................................................................................. 259

3.1 INTERACTION OF REINFORCED ELEMENTS WITH POLYMER MATRIX

A reinforced metal is a composition made of two or more various materials. Application of continuous glass fibers and high-strength polymer fibers for marking goods by the winding method is one of the achievements in the field of choice of reinforced materials. Various thermoactive and thermoplastic resins (e.g., phenolic, polyester, melamine silicon, and epoxy resins) and also high elastic rubber and elastics are used as a binder in reinforced plates. Making of responsible constructions of pipelines, reservoirs, and high-pressure vessels by the winding method is the achievement in the field of application of reinforced plastic materials: Flexibility and high specific strength is the advantage of these goods. Introduction of winding processes to the production of bodies of rocket engines and bodies of buoyant constructions (of tankers, submarines, underwater flexible aerials, and oil storages) accelerated development of manufacturing methods of high strength and reliable goods by the winding method.