Characterization and Failure Analysis of a Polymeric Clamp Hanger Component

Francis, D.K., Deang, J., Florea, R. S., Gaston, D. R., Lee, N., Nouranian, S., Permann, C., Rudd, J., Seely, D. W., Whittington, W. R., & Horstemeyer, M. (2012). Characterization and Failure Analysis of a Polymeric Clamp Hanger Component. Engineering Failure Analysis. 26, 230-239. DOI:10.1016/j.engfailanal.2012.07.020.

This paper characterizes the failure of a polymeric clamp hanger component using finite element analysis coupled with experimental methods such as scanning electron microscopy, x-ray computed tomography, and mechanical testing. Using Fourier transform infrared spectroscopy, the material was quantified as a polypropylene. Internal porosity that arose from the manufacturing procedure was determined using three dimensional x-ray computed tomography. From experimental mechanical static tests, the forces applied on the component were determined and used in a finite element simulation, which clearly showed the process of fracture arising from the pre-existing processing pores. The fracture surfaces were observed under a scanning electron microscope confirming the finite element simulation results illustrating that low-cycle fatigue fracture occurred in which the fatigue cracks nucleated from the manufacturing porosity.