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15. Complete the following sentences:

1. Materials Science and Technology is the study … and how they can ... .to

2. Using the laboratory techniques and knowledge of physics, chemistry, and metallurgy, scientists are finding …. .

3.Engineers must know how materials respond to …. .

4. The materials may also have … or they ….

5. Compression is … .

6. Tension is … .

7. Under larger tensions, the material does not … , and under greater forces … .

8. Fatigue is … .

9. Knowledge of …. , … , and … and … are of basic importance in … .

10. Creep is …

11. Creep … leads to … of the material. 

16. Find in the text answers to the following questions. Work in pairs. Use such expressions as:

I think/suppose/ consider/believe; to my mind/ in my opinion; as far as I remember/ know/ understand; Let me see…; How shall I put it?; Well, let me think..; Let’s put it this way…; I’ll have to think about that; The best way I can answer that is…; That’s a good question.; That’s a difficult question. Let me see….

1. What are the external forces that cause the elastic deformation of materials? Describe those forces that change the form and size of materials.

2. What are the results of external forces?

3. What kinds of deformation are the combinations of tension and compression?

4. What is the result of tension?

5. What happens if the elastic limit of material is exceeded under tension?

6. What do we call fatigue? When does it occur?

7. What are the results of fatigue? 

8. What do we call creep? When does this type of permanent deformation take place?

9. What are the results of creep?

17. Match the following definitions with their terms:

scientist

the action of compressing or being compressed

laboratory

is a twisting effect on something such as a piece of metal or an organ of the body

tension

a person who is studying or has expert knowledge of one or more of the natural or physical sciences

compression

weakness in metal or other materials caused by repeated variations of stress

torsion

the gradual deformation of materials under stress

fatigue

a room or building equipped for scientific experiments, research, or teaching, or for the manufacture of drugs or chemicals

creep

apply a force to (something) which tends to stretch it

18. Speak on the following topic:

  • How materials react to external forces.

19. Translate the following sentences.

1. Упругая деформация — это реакция всех материалов на внешние силы, такие, как растяжение, сжатие, скручивание, изгиб и срез.

2. Усталость и ползучесть материалов являются результатом внешних сил.

3. Внешние силы вызывают постоянную деформацию и разрушение материала.

4. Растягивающие и сжимающие силы работают одновременно, когда мы изгибаем или скручиваем материал.

5. Растяжение материала выше предела его упругости дает постоянную деформацию или разрушение.

6. Когда деталь работает долгое время под циклическими напряжениями, в ней появляются небольшие растущие трещины из-за усталости металла.

7. Ползучесть — это медленное изменение размера детали под напряжением.