Investigation Experimentally the Effect of Thermal Stresses on the Straight and Curved Natural Composite Material Pipes

Abstract

This paper study experimentally the effect of changing the angle of curvature pipe made from natural composite materials (eggshell powder with polyester) under thermal load. This work involves the design and fabricate of straight and curved pipe samples with difference angle of curvatures (34° and 48°) at 50 % weight fraction. Three composite pipes were tested (straight pipe, curved pipe with angle 34°, and curved pipe with angle 48°). Tensile and thermo-mechanical test were performing to find the mechanical properties of the specimens. Experimental work included design and manufacturing test rig to simulate thermal stress. The experimental results revealed that a maximum hoop strain and longitudinal strain increased with increasing the temperature for all test pipes. The longitudinal stresses at crown and intrados positions were more than the longitudinal stress at extrados position by 258 % and 199 % respectively and the von mises stresses at crown and intrados positions were more than the von mises stress at extrados position by 180 % and 165 % respectively. In the curved pipe with angle 48°, the hoop strains at intrados and crown positions were more than the hoop strain at extrados position by 78 % and 37 % respectively.