Pipe Bend Experiment
The present paper provides the effect of ovality in inlet pigtail pipe bend of a hydrogen reformer under combined internal pressure and in-plane bending loading. Finite element analysis (FEA) and experiments have been used. An incoloy Ni-Fe-Cr B407 alloy material considered for study and assumed to be elastic-perfectly plastic behavior. The design of pipe bend is based on ASME B31.3 standard and during manufacturing process, it is challenging to avoid thickening on the inner radius and thinning on the outer radius of pipe bend. This geometrical shape imperfection is known as ovality and its effect needs investigation which is considered for the study. The finite element analysis (ANSYS Workbench) results showed that ovality affects the load …show more content…
It was found that the FE limit load results were much higher due to the presence of the attached straight pipe to the pipe bend than the existing analytical solution. The plastic deformation could occur not only in pipe bend but also in the attached straight pipe [12]. The limit load was shown decreasing with the decreasing length of the attached straight pipe and eventually to approaching the existing analytical …show more content…
Values of r/t were ranged from r/t=5 to 20, with those of h from h=0.1 to 0.5. The percent ovality Co varied from 0 to 20. As shown in Ref. [2, 3], the effect of ovality in pipe bend for the attached straight pipe on limit loads is important. Thus the present work considered that the bend geometry is modeled with shape imperfection. (Dmax=D+2[X], Dmin= D-2[X]) indicated in Fig. 3. Material The present work includes the stress and deformation analysis of inlet pigtail pipe bend made from an incoloy Ni-Fe-Cr B407 alloy material. The relevant material properties are E=196 KN/mm2, γ=0.3, and σo=172KN/mm2, where E, γ and σo are Young’s modulus, Poisson’s ratio and limiting yield stress respectively. FE mesh and
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