Reaching Breaking Point: Materials, Stresses, & Toughness: Crash Course Engineering #18

The video explores the importance of selecting appropriate materials in engineering to prevent disasters like the Titanic. It covers the historical use of materials, modern advancements, and categorizes materials into metals, ceramics, and polymers. The focus is on understanding mechanical properties such as stress, strain, modulus of elasticity, and toughness. The video also explains testing methods like the Charpy impact test and discusses additional properties like hardness, creep strength, and fatigue strength, emphasizing their role in ensuring structural integrity.

What was the primary reason for the Titanic's sinking?

• A fire on board

• A collision with another ship

• A mechanical failure

• A collision with an iceberg

Which of the following is an example of a modern advanced material?

• Iron

• Stone

• Graphene

• Wood

What is the primary focus when selecting materials for engineering applications?

• Color of the material

• Availability of the material

• Mechanical properties

• Cost of the material

Which type of stress stretches and potentially elongates a material?

• Compressive stress

• Thermal stress

• Tensile stress

• Shear stress

What does the modulus of elasticity measure?

• The resistance to bending and stretching

• The weight of a material

• The color of a material

• The cost of a material

What is the yield stress in a material?

• The temperature at which a material melts

• The color change in a material

• The point at which a material starts to deform

• The maximum weight a material can hold

How is toughness represented on a stress-strain diagram?

• By the color of the line

• By the slope of the line

• By the area under the curve

• By the length of the line

What does the Charpy impact test measure?

• The temperature resistance of a material

• The toughness of a material

• The weight of a material

• The color of a material

What is creep strength?

• Resistance to deformation under long-term stress

• The ability to conduct electricity

• The color change over time

• The weight of a material

Which property measures how many times a material can endure stress before failing?

• Thermal resistance

• Creep strength

• Hardness

• Fatigue strength