Galling

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/galling

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the classification of wear?Severe adhesive wear involving material transfer and plastic deformation
2. What is the key influencing factors?Material properties (affinity, crystal structure), surface cleanliness, load, sliding speed, temperature, lubrication
3. Why does galling happen when metal parts slide?When the bumps on the metal touch hard enough, they can break and stick together, forming tiny welds that break when the parts keep moving.
4. How does lack of lubrication cause galling?If there is no oil or grease to keep a thin film between the parts, the metal bumps touch directly and can stick and tear.

Adhesive Wear: Wear caused by the formation and fracture of junctions between sliding surfaces.
Tribology: The science and engineering of interacting surfaces in relative motion, including friction, wear, and lubrication.
Asperities: Microscopic irregularities or high points on a seemingly smooth surface.