Engineering Failure Analysis

Course Description

EML4234 Engineering Failure Analysis is an upper-division mechanical engineering course taught by one Florida public institution, Florida Polytechnic University in Lakeland, at 3 credits. Florida Poly describes it as an introduction to failure analysis methodology, together with macroscopic and microscopic examination methods used to identify the common causes of failure in engineering structures, taught through case studies. In other words, it teaches the investigator's question: a part has broken, cracked, worn or corroded, so how do you work out why, and what evidence would prove it?

Because only one institution teaches it under this title, this guide describes Florida Poly's course. Outcomes and topics beyond Florida Poly's catalog description are drawn from standard failure-analysis practice (the ASM Handbook, Vol. 11, and the ASTM test standards named below) and from Florida Poly's companion course EML4541 Fatigue and Fracture Mechanics. Treat them as the expected shape of the course, and check the syllabus for the term you take it.

At Florida Poly the course is one of the elective options in the Materials & Advanced Manufacturing concentration of the B.S. in Mechanical Engineering, where students choose four courses (12 credits); EML4541 is another option in the same list. Both courses were created in the state course file in 2022.

⚠ The number carries a different statewide title. In Florida's Statewide Course Numbering System (SCNS), courses are matched on the prefix and the last three digits, and the statewide record for EML x234 is titled Material Science and Engineering: "microscopic treatment of the mechanical behavior of engineering materials, strengthening mechanisms, fracture, fatigue and creep." Florida A&M and Florida State (which share the FAMU-FSU College of Engineering) carry that number as EML3234 Material Science & Engineering, a general materials science course. Florida Poly's course and the FAMU-FSU course therefore match by number while teaching different things; see Special Information.

Learning Outcomes

Required Outcomes

• Apply a structured failure analysis methodology: collect background and service history, preserve evidence, plan non-destructive work before destructive work, form and test hypotheses, and reach a root cause.
• Use macroscopic examination (visual inspection, stereo microscopy, photography of fracture surfaces) to locate the origin of a failure and read its direction of propagation.
• Interpret microscopic evidence (optical metallography and scanning electron microscopy) to distinguish ductile overload, brittle fracture, fatigue and environmentally assisted cracking.
• Identify the common failure mechanisms of engineering components: overload, fatigue, wear, corrosion, stress-corrosion cracking, hydrogen embrittlement, creep and elevated-temperature damage.
• Relate a failure to its contributing design, material, manufacturing, installation and service causes, and separate the root cause from the symptoms.
• Analyse published case studies and communicate findings in a written failure analysis report with evidence, conclusions and recommendations.

Optional Outcomes

• Select and interpret mechanical tests used in failure investigations: tension (ASTM E8/E8M), hardness (ASTM E18, E384), Charpy impact (ASTM E23) and fracture toughness (ASTM E399).
• Apply basic fracture mechanics (stress intensity factor, critical crack size) to judge whether a flaw was tolerable. This is treated in depth in EML4541.
• Use chemical analysis and microstructure to check whether the material met its specification.
• Recommend corrective actions and prevention measures: design changes, material or heat-treatment changes, inspection intervals.

Major Topics

Required Topics

• The failure analysis process: investigation plan, evidence handling and chain of custody, sequence of examinations
• Fracture surface examination: macro features (beach marks, chevrons, shear lips, ratchet marks) and micro features (dimples, cleavage, intergranular facets, fatigue striations)
• Ductile and brittle overload; ductile-to-brittle transition
• Fatigue failure: initiation at stress concentrations, crack growth, final fracture
• Wear, corrosion and environmentally assisted cracking
• Elevated-temperature failures and creep
• Manufacturing and processing defects: casting, welding, forging, heat treatment and machining
• Case studies across engineering structures and machine components

Optional Topics

• Non-destructive evaluation: dye penetrant, magnetic particle, ultrasonic and radiographic inspection
• Failures of polymers, ceramics and composites
• Introductory linear-elastic fracture mechanics
• Root-cause analysis tools: fault tree, fishbone diagram, failure mode and effects analysis (FMEA)
• Reporting, expert-witness practice and the role of failure analysis in litigation and insurance

Resources & Tools

• ASM Handbook, Volume 11: Failure Analysis and Prevention (ASM International): the standard reference for the field.
• ASM Handbook, Volume 12: Fractography, for fracture surface interpretation.
• F.C. Campbell, Fatigue and Fracture: Understanding the Basics (ASM International, 2012), the reference text on Florida Poly's EML4541 syllabus (Spring 2026). Its required text is Stephens, Fatemi, Stephens and Fuchs, Metal Fatigue in Engineering, 2nd ed. (Wiley, 2001).
• ASTM standards that govern the tests used in investigations: E8/E8M (tension), E18 (Rockwell hardness), E23 (Charpy impact), E384 (microindentation hardness), E399 (plane-strain fracture toughness), E466 and E606 (fatigue testing), E1823 (fatigue and fracture terminology).
• Laboratory equipment: stereo microscope, metallographic sectioning and polishing, optical microscope, scanning electron microscope (SEM) with energy-dispersive spectroscopy (EDS), hardness testers.
• Professional bodies: ASM International (its Failure Analysis Society) and the National Academy of Forensic Engineers.

Career Pathways

• Materials engineer (SOC 17-2131): failure investigation is a core materials-engineering task.
• Mechanical engineer (SOC 17-2141), especially in design, reliability and product engineering.
• Reliability and quality engineer in manufacturing, aerospace and power generation.
• Forensic engineer in consulting firms that investigate failures for insurers, attorneys and manufacturers. In Florida, offering engineering services to the public requires a Professional Engineer licence under Chapter 471, Florida Statutes.
• Metallurgical laboratory engineer or technician in testing and inspection laboratories.
• Florida context: Florida Poly sits on the I-4 corridor between Tampa and Orlando. Florida's aerospace sector on the Space Coast, its power-generation plants and its manufacturing employers all run failure investigations, which is where this skill set is used.

Special Information

Offering Notes

One public carrier: Florida Polytechnic University, EML4234 Engineering Failure Analysis, 3 credits. Florida Poly does not publish contact hours, so this guide uses 45, Florida's convention for a 3-credit lecture course. The statewide record marks the number as having no laboratory component.

⚠ The same statewide number means a different course at FAMU-FSU

SCNS treats EML3234 and EML4234 as the same course, because equivalence depends on the prefix and the last three digits, not the level digit. The statewide title for EML x234 is Material Science and Engineering. Florida Poly teaches a case-study failure analysis course under it; FAMU and FSU teach a general materials science course ("concepts of materials science and their relevance to engineering design") as EML3234. The statewide description (mechanical behaviour, strengthening, fracture, fatigue and creep) covers ground both touch, but they are not the same preparation.

• A student transferring from FAMU-FSU to Florida Poly with EML3234 has an introductory materials science course, not a failure analysis course. Ask the department how it will be counted.
• A student transferring from Florida Poly with EML4234 should send the syllabus. A receiving department may treat it as a materials elective rather than as its own materials science course.

Related courses elsewhere in Florida

No other public institution teaches a course titled Engineering Failure Analysis, but several cover parts of the subject:

• EML4541 Fatigue and Fracture Mechanics: Florida Poly (its companion elective), and the University of North Florida as Design Against Mechanical Failure from August 2026. Statewide prerequisites: EGN3331 Strength of Materials and EGN3365 Structure and Properties of Materials.
• EML4575 Principles of Fracture Mechanics: USF and UWF.
• EMA4714 Materials Selection & Failure Analysis: University of Florida (materials science and engineering).
• EML5233 Failure of Materials in Mechanical Design: University of Florida, graduate level.

Prerequisites and preparation

Florida Poly's prerequisite for EML4234 could not be read for this guide, because its online catalog does not serve course pages to automated tools. Its companion course EML4541 requires EGN3331 Strength of Materials and EGN3365 Structure and Properties of Materials, and EML4234 sits in the same concentration list, so expect the same preparation. Confirm in Florida Poly's catalog before registering. Come in comfortable with stress and strain, stress concentration, crystal structure, phase diagrams and heat treatment of steels.

FE exam relevance

The NCEES FE Mechanical exam includes Material Properties and Processing and Mechanics of Materials; failure modes, fatigue and fracture toughness appear in both. Florida Poly's EML4541 syllabus already restricts calculators to the FE-approved models, which signals that the department prepares students for that exam.

AI Integration (Optional)

AI tools are useful in failure analysis for literature and case searches (finding published failures of similar components), for drafting report structure, and increasingly for image-based classification of fracture surfaces and microstructures. They are weak at the step this course exists to teach: reasoning from physical evidence to a defensible root cause. A language model asked why a shaft failed will produce a plausible list of usual suspects without having seen the fracture surface, and will often name "fatigue" because it is the most common answer. An investigator must rule causes in or out on evidence, so treat any AI suggestion as a hypothesis to test, never as a finding.

Failure reports are frequently used in warranty claims, insurance and litigation, where every statement must be traceable to an observation or a test. Do not include AI-generated claims you have not verified, and follow your instructor's policy on disclosing AI use in reports.