An Introduction to Fatigue Testing

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Material or structural failures are typically the result of two types of loading modes: a single (static) load that results in failure or a repeated (cyclic) load that causes the material or structure to fatigue over time. When designing materials or structures it is important to understand which loading types will be experienced, and to account for them in the design process. In this presentation, Troy Nickel focuses on repeated loading that ultimately leads to construct fatigue, and explores some real world examples of how ElectroForce test instruments are used to determine fatigue limits. The presentation will address the following topics:
- Introduce failure modes and why they are important
- Identify the principles of fatigue and considerations for fatigue test development
- Real world case studies of fatigue testing
- Instrument selection considerations for fatigue test protocol design
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CHAPTERS
0:00 Intro
1:39 Measuring Fatigue Strength
2:08 TA Instruments
2:54 Why Understanding Strength is Important
6:04 Failure Regimes
8:46 Simple Demonstration
10:16 Single Load to Failure
12:15 Principles of Fatigue
13:17 Fatigue Test Design
24:31 Fatigue Test Results
34:12 Fatigue Composite Example
36:24 Composite Example Results
38:06 Fatigue Stent Wire Example
40:20 Stent Wire Example Results
42:18 Fatigue Nuclear Fuel Rod Example
44:45 Nuclear Fuel Rod Results
46:27 Fatigue Running Shoe Foam Example
48:35 Running Shoe Foam Results
49:47 Instrument Selection
59:25 Outro/Q&A Session

[@pacifist9947]

I wonder why stress ratio of classic tension-tension test is 0.1. Is there any special reason or something?