fatigue life
lowtechnical / engineering
Definition
Meaning
The number of cycles of stress a material can endure before failure under repeated loading.
A measure of durability and resilience under cyclic stress; used metaphorically to describe the operational lifespan of systems or components before wear-out.
Linguistics
Semantic Notes
A compound noun used almost exclusively in materials science, mechanical engineering, and related fields. It is a quantifiable, measurable property.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences; the term is identical in both varieties. Spelling follows local conventions (e.g., British 'fibre' vs. American 'fiber' in related contexts).
Connotations
Technical, precise, quantitative. No regional connotative differences.
Frequency
Equally low frequency in both regions, confined to engineering contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
The fatigue life of [COMPONENT] is [NUMBER] cycles.Engineers estimated the fatigue life.A key design goal is to maximise fatigue life.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “[No common idioms. Technical term.]”
Usage
Context Usage
Business
Used in procurement, warranty specifications, and lifecycle cost analysis for mechanical components.
Academic
Central term in materials science, mechanical engineering, and structural integrity research papers.
Everyday
Virtually never used in everyday conversation.
Technical
Precise, measurable property critical for design, testing, and certification of aircraft, vehicles, machinery, and structures.
Examples
By Part of Speech
verb
British English
- The component was fatigued to determine its life.
- They are fatiguing the test coupons in the laboratory.
American English
- We need to fatigue-test the prototype.
- The alloy fatigued more rapidly than predicted.
adverb
British English
- [No standard adverbial use.]
American English
- [No standard adverbial use.]
adjective
British English
- The fatigue-life properties were outstanding.
- A fatigue-life analysis was conducted.
American English
- Fatigue life testing is mandatory.
- The report included fatigue-life predictions.
Examples
By CEFR Level
- [Too technical for A2.]
- [Too technical for B1.]
- The engineer explained that a longer fatigue life means the part won't break as quickly.
- A key factor in bridge design is the fatigue life of the steel cables.
- The study aimed to correlate microstructural features with the observed fatigue life of the titanium alloy.
- We must increase the gear's fatigue life by at least 20% to meet the new safety standards.
Learning
Memory Aids
Mnemonic
Think of a paperclip bent back and forth until it snaps. The number of bends it survives is its 'fatigue life'.
Conceptual Metaphor
MATERIAL DURABILITY IS A MEASURABLE LIFESPAN / CYCLIC STRESS IS A COUNTDOWN TO FAILURE.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid direct translation as 'усталостная жизнь'. Use 'ресурс усталости', 'предел выносливости', or 'долговечность при циклических нагрузках'.
- The word 'life' here means 'duration' or 'span', not biological life.
Common Mistakes
- Using 'fatigue life' to refer to general tiredness in people.
- Confusing it with 'fatigue strength' (the stress level that causes failure at a given number of cycles).
Practice
Quiz
What does 'fatigue life' specifically measure?
FAQ
Frequently Asked Questions
No. 'Shelf life' refers to degradation over time in storage. 'Fatigue life' refers to failure from repeated mechanical stress or strain.
Only metaphorically or humorously in very informal contexts (e.g., 'My fatigue life after three kids is about two cycles per night'). Technically, it is for materials and components.
It is expressed as a number of cycles (e.g., 1,000,000 cycles). Sometimes expressed with respect to a probability of failure (e.g., B10 life).
Through design (smoothing stress concentrations), material selection (tougher alloys), and manufacturing processes (shot peening, surface hardening).