Dissertation/Thesis Abstract

Failure Analysis of a Thermoplastic Plumbing Fitting Assembly
by Yano, Derek J., M.S., California State University, Long Beach, 2018, 55; 10837700
Abstract (Summary)

Environmental Stress Cracking (ESC) is a phenomenon that can cause pipes and fittings to fail, often causing extensive water damage to residential homes and commercial businesses. Premature failure was observed in a bathroom sink faucet that had been in service for approximately one month. The failure involved the fracture of a plastic coupling nut molded from a Polyethylene Ether-Polystyrene (PPE-PS) material. The objective of this investigation was to determine the nature and cause of the failure. The mechanism and type of failure have been deduced from a morphological examination of the fracture surface via Scanning Electron Microscopy (SEM), material analysis via Fourier-Transform Infrared Spectroscopy (FT-IR), Finite Element Analysis (FEA), and analytical testing. The results of the analysis indicated that the failure mode was caused by ESC, due to the presence of an incompatible chemical and mechanical stress that caused localized stress and crack initiation.

Indexing (document details)
Advisor: Chen, Hsin-Piao
Commitee: Shabeer, Ahamed, Torabzadeh, Jalal
School: California State University, Long Beach
Department: Mechanical and Aerospace Engineering
School Location: United States -- California
Source: MAI 58/01M(E), Masters Abstracts International
Subjects: Mechanical engineering
Keywords: Environmental stress cracking, Failure analysis, Fourier-transform infrared spectroscopy, Polyphenylene ether, Polystyrene, Scanning electron microscopy
Publication Number: 10837700
ISBN: 978-0-438-41995-7
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