bone test events specimen Modulus important in Fixed strain rate buried pipeline design Modulus is needed to Modulus values at determine deflection other temperatures and buckling from and design life are design loads required for design Determination of Modulus 1% Proportional Limit 85% of Tangent Modulus Properties of Materials Hoop Stress Ring Bending Strain Importanceof Strain Property Comparison to other materials ABS 1% PE 4.0% PVC-U 1% PVC-O 1.3% Steel & DICL Not relevant GRP 0.2 to 0.6 % Stiffness AS 2566.1 ABS is classified as a rigid thermoplastic over its working temperature range of -30º to 70ºC Stiffness AS 2566.1 ·2 year value can be used where soil support is provided ·50 year value should be used in poor soils Creep Variation of properties in time Long Term Loading/Stress Relaxation
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