- •Передмова
- •Contents
- •Lesson 1
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: Deformation and Stress
- •Answer the following questions:
- •Translate the following words and word combinations into Ukrainian:
- •Match the first part of the sentence (1-7) with the second part (a-g).
- •Finish the following sentences:
- •The definitions of the words are given. Try to guess these words.
- •8. Match English words with their Ukrainian equivalents:
- •9. Make a summary of the text. Lesson 2
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: Types of Deformation
- •Answer the following questions:
- •Complete the sentences with the appropriate words from the text:
- •Make up word combinations from the following words, translate them into Ukrainian.
- •Finish the following sentences:
- •Match the words with their definitions:
- •8. Match English words with their Ukrainian equivalents:
- •9. Express the main idea of the text in the shortest possible way. Lesson 3
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: Compressive Stress
- •Answer the following questions:
- •The definitions of the words are given. Try to guess these words.
- •Make up word combinations from the following words, translate them into Ukrainian.
- •Decide whether the statements below are true or false:
- •Lesson 4
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Tensile Strength
- •Answer the following questions:
- •Match the English phrases with their Ukrainian equivalents:
- •Decide whether the statements below are true or false:
- •The definitions of the words are given. Try to guess these words.
- •Lesson 5
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Controlling Shock and Vibration in Electronic Products
- •Answer the following questions:
- •Match the first part of the sentence (1-7) with the second part (a-g).
- •Match the words with their definitions:
- •Complete the sentences with the appropriate words from the text:
- •Lesson 6
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Random Vibration. Design Rules of Thumb
- •Answer the following questions:
- •Put these words in to the right order to make sentences:
- •Match the English phrases with their Ukrainian equivalents:
- •Complete the sentences with the appropriate words from the text:
- •Finish the following sentences:
- •8. Match English words with their Ukrainian equivalents:
- •9. Express the main idea of the text in the shortest possible way. Lesson 7
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: From the History of Strength Theories
- •Answer the following questions:
- •Match the words with their definitions:
- •Put these words in to the right order to make sentences:
- •Make up word combinations from the following words, translate them into Ukrainian:
- •Decide whether the statements below are true or false:
- •8. Match English words with their Ukrainian equivalents:
- •9. Make a plan of the text. Lesson 8
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: Mohr's Strength Theories
- •Answer the following questions:
- •Finish the following sentences:
- •Translate the following words and word combinations into Ukrainian:
- •Put these words in to the right order to make sentences:
- •Complete the sentences with the appropriate words from the text.
- •8. Match English words with their Ukrainian equivalents:
- •9. Give subtitles to each paragraph of the text. Lesson 9
- •Find in the text English equivalents for the following Ukrainian words and word combinations:
- •Read and translate the text: Strength Theories
- •Answer the following questions:
- •Decide, whether the statements below are true or false:
- •Match the first part of the sentence (1-7) with the second part (a-g).
- •Translation Techniques
- •References:
9. Make a summary of the text. Lesson 2
Find in the text English equivalents for the following Ukrainian words and word combinations:
утома(матеріалу), сила, залежить від, початковий,розрив, повторення, повністю, молекулярний рівень, реверсивний, податливий(матеріал), м’який, усувати, помірний, твердий, уразливий(матеріал), невеликий, форма, повертатися, визначити, виявити, достатній, деформація, розмір, тріщина, рішення, границя, достатній, можливість, поломка.
Read and translate the text: Types of Deformation
Depending on the type of material, size and geometry of the object, and the forces applied, various types of deformation may result.
Elastic deformation. This type of deformation is reversible. Once the forces are no longer applied, the object returns to its original shape. As the name implies, elastic (rubber) has a rather large elastic deformation range. Soft thermoplastics and metals have moderate elastic deformation ranges while ceramics, crystals, and hard thermosetting plastics undergo almost no elastic deformation.
Metal fatigue. A phenomenon only discovered in modern times is metal fatigue, which occurs primarily in ductile metals. It was originally thought that a material deformed only within the elastic range returned completely to its original state once the forces were removed. However, faults are introduced at the molecular level with each deformation. After many deformations, cracks will begin to appear, followed soon after by a fracture, with no apparent plastic deformation in between. Depending on the material, shape, and how close to the elastic limit it is deformed, failure may require thousands, millions, billions, or trillions of deformations.
Metal fatigue has been a major cause of aircraft failure, such as the De Havilland Comet, especially before the process was well understood. There are two ways to determine when a part is in danger of metal fatigue; either predict when failure will occur due to the material/force/shape/iteration combination, and replace the vulnerable materials before this occurs, or perform inspections to detect the microscopic cracks and perform replacement once they occur. Selection of materials which are not likely to suffer from metal fatigue during the life of the product is the best solution, but not always possible. Avoiding shapes with sharp corners limits metal fatigue by reducing force concentrations, but does not eliminate it.
Plastic deformation. This type of deformation is not reversible. However, an object in the plastic deformation range will first have undergone elastic deformation, which is reversible, so the object will return part way to its original shape. Soft thermoplastics have a rather large plastic deformation range as do ductile metals such as copper, silver, and gold. Steel does, too, but not iron. Hard thermosetting plastics, rubber, crystals, and ceramics have minimal plastic deformation ranges. Perhaps the material with the largest plastic deformation range is wet chewing gum, which can be stretched dozens of times its original length.
Fracture. This type of deformation is also not reversible. A break occurs after the material has reached the end of the elastic, and then plastic, deformation ranges. At this point forces accumulate until they are sufficient to cause a fracture. All materials will eventually fracture, if sufficient forces are applied.