2/3/2014· Failure Analysis
By: Dr. Thomas Read
The root cause of the failure of customer returns of heated automobile rear view mirrors was investigated.
articles
Titanium Surgical Screws Failure Analysis
By: Dr. Thomas Read
Tel: (707) 544-2374
Email Dr. Read
Website: www.ReadConsulting.com
View Profile on Experts.com.
Read Consulting Failure Analysis Laboratory was engaged to determine the cause of failure of two titanium surgical screws used in corrective back surgery. These were both 6.5 mm diameter, 40mm long screws that were surgically implanted. in a patient, and they subsequently failed.
Result Summary
Both screws were made from titanium, aluminum, vanadium alloy. In addition, both failures are attributed to bending fatigue that initiated at the screw’s minor diameter (i.e. at the thread root). One failure initiated at what appears to be a “machining” or “turning” mark on the minor diameter. The other failure initiated at a very similar location, but there is no visible machining mark. In either case, the fatigue cracks started at a stress riser.
Figure #1: Photograph of the two failed screws.
Figure #2: Photomicrograph of the fracture surface on screw #1. This fatigue crack appears to have started at the �root� of the thread.
Figure #3: Photomicrograph of the fracture surface on screw #2. This fatigue crack appears to have started at a machining mark in the root of the thread.
Figure #2: Photomicrograph of the fracture surface on screw #1. This fatigue crack appears to have started at the �root� of the thread.
Figure #4: Photomicrograph side view of screw #2. This fatigue crack appears to have started at a machining mark in the "root" of the thread.
Dr. Thomas L. Read, CEO of Read Consulting received his PhD. from Stanford University in 1972. He has over 25 years of manufacturing experience in electronics, metallurgy, factory safety, failure analysis, glass fracture, glass failure and bottle failure. As a member of the electronics industry, Dr. Read has earned process patents and has an extensive background in manufacturing techniques. In parallel, he has spent over twenty five years as a consultant to attorneys and engineers in the areas of failure analysis, metallurgy, glass fracture, glass failure, bottle failure, factory safety, manufacturing problems, intellectual property and patent disputes.
©Copyright - All Rights Reserved
DO NOT REPRODUCE WITHOUT WRITTEN PERMISSION BY AUTHOR.
Related articles
4/5/2024· Failure Analysis
Defending Assets: A Legal Perspective On Corrosion Prevention
Corrosion poses a significant threat to various industries, and its impact on assets cannot be underestimated. As an engineer, you might wonder how this topic can be of interest to an attorney. Well, attorneys play a crucial role in protecting their clients' interests, and corrosion prevention aligns seamlessly with legal strategies aimed at safeguarding assets. In this article, we will explore the legal implications of corrosion and the role attorneys can play in mitigating its risks.
7/7/2009· Failure Analysis
Failure Analysis of a Failed Ceramic Water Holding Tank on a Toilet
By: Dr. Thomas Read
The cracked tank was first inspected in the "as received" condition. In this condition it was cracked, but it was still whole. Next, the failed tank was separated by pulling it apart. This was done to expose the fracture surfaces of the main crack. This allowed for a complete failure analysis and for a determination of where the crack initiated.
Follow us
