ADVANCED MATERIALS & PROCESSES | MARCH 2026 23 This is the third and final part in a series designed to provide readers with an understanding of systematic, team-based failure investigations. This article suggests best practices for documenting and presenting the results of the study. As established in the first two parts of this series, a failure investigation is a problem-solving process with some very specific and unique requirements. Finding the source or the true root cause (TRC) of the failure is and always should be the ultimate goal of the investigation. Every failure investigation must be conducted in a well-documented and systematic method if it is to be successful. The following discussion will provide such a methodology. PROBLEM-SOLVING PROCESSES All problem-solving processes require a systematic methodology. Additionally, the process utilized must be tailored to the nature of the problem to resolve. An internet search for problem solving approaches will reveal roughly 40 processes and methods utilized by industry. Each process has a specific methodology and detailed plan for completion. While the various processes and methods have different steps to follow and slightly different methodology, they all share the same goal of determining the TRC. With the many problem-solving techniques available, it becomes obvious that one FAILURE INVESTIGATIONS: A SYSTEMATIC PROBLEMSOLVING PROCESS, PART III The third article of a series describes the 8P failure investigation process to assist in the initiation, documentation, and presentation of a failure investigation. Jeffrey L. Hess, Fort Wayne, Indiana STAGES OF A METALLURGICAL FAILURE Failures of a component or system have a beginning and an end. The beginning or initiation is the source of the TRC and the end is the final failure, specifically the failure mode(s). The progression of a failure from the beginning to the final failure is termed process does not work for all situations. This premise is particularly true with failure investigations and was the driving force for the development of a process specifically tailored to meet the unique needs of a failure investigation. To understand the requirements and methodology of conducting a failure investigation, the progression of a failure must first be understood. Fig. 1 — Progression of a materials failure investigation. TABLE 1 — STAGES OF A MATERIALS FAILURE Stage Failure progression Question addressed Initiation Source of the failure (TRC) Why Propagation Failure mechanism How Final failure Failure mode What
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