04. Factors Influencing Choice of Material 1

Recap Questions

Multiple Choice

DMADV stands for

• design measure analyse define validate

• define measure analyse design verify

• define measure analyse design validate

• design measure analyse define verify

Multiple Choice

we use DMADV if ...

• it can't be analyse in DMAIC

• the cpk value below 1.33

• any special cause

• the process doesn't exist

Multiple Select

DMADV is a .... approach/method

• reengineering

• continous improvement

Multiple Choice

Verify cause & effect relationship and to determine the root cause(s) of the defect is the definition of ... stage

• analyse

• verify

• control

• design

Multiple Choice

The Six Sigma method DMADV is used to?

• Improve an existing business process

• Create new products or process designs

• Optimise an existing product

• Define high level project goals

Multiple Choice

In the Six Sigma method DMADV, at what stage would you ‘identify factors critical to quality, and identify the capabilities of the product and the production process’ ?

• Define

• Measure

• Analyse

• Verify

Multiple Choice

The Six Sigma Business Improvement Technique aims to?

• Minimise the process outputs

• Maximises variability

• Identify and remove the causes of defects

• Eliminate any future defects

Activity

Classification of Material

Open Ended

How many mechanical properties can you name?

Questions on

Mechanical

properties

Multiple Choice

What property does a material have if it returns to its original shape after being deformed?

• Elasticity

• Plasticity

• Strength

• Ductility

Multiple Choice

Which of the following is not a mechanical property of materials?

• Hardness

• Resistivity

• Brittleness

• Toughness

Multiple Choice

Which do you think is the least plastic material

• Putty

• Dough

• Gum

• Spoung

Multiple Choice

Which property is defined from the ability to be drawn out into a wire?

• Hardness

• Malleability

• Ductility

• Plasticity

Multiple Choice

Which do you think is the most malleable substance?

• Copper

• Ice

• Glass

• Rubber

Fill in the Blanks

Fill in the Blanks

Fill in the Blanks

Open Ended

Can you suggest a material for the body, tires and windscreen

Activity

Stress Calculations

Open Ended

Question 1: Basic Stress Calculation

A metal rod has a cross-sectional area of 0.002 m² and experiences a tensile force of 2000 N. What is the stress in the rod?

Open Ended

Question 2: Finding the Force

A steel cable experiences a stress of 50 MPa. If its cross-sectional area is 0.005 m², what force is acting on it?

Open Ended

Question 3: Finding the Cross-Sectional Area

A bolt experiences a tensile force of 15,000 N and the resulting stress is 300 MPa. What is the cross-sectional area of the bolt?

Open Ended

Question 4: Stress in a Circular Rod

A circular rod with a diameter of 10 mm carries a tensile force of 5000 N. Calculate the stress in the rod.

Open Ended

Question 5: Stress in a Rectangular Plate

A rectangular metal plate with a width of 50 mm and thickness of 10 mm carries a force of 25,000 N. Calculate the stress in the plate.

Activity

Strain Calculations

Open Ended

Question 1: Basic Strain Calculation

A steel rod originally 2 m long is stretched by 0.002 m under tension. What is the strain?

Open Ended

Question 2: Finding the Change in Length

A metal wire experiences a strain of 0.005 when stretched. If its original length was 1.5 m, how much has it elongated?

Open Ended

Question 3: Finding the Original Length

A plastic strip stretches by 4 mm under tension. If the strain is 0.002, what was its original length?

Open Ended

Question 4: Strain in a Compressed Bar

A wooden bar originally 0.8 m long is compressed by 1.6 mm. What is the strain?

Open Ended

Question 5: Strain in a Long Wire

A 3.5 m long copper wire is stretched by 5 mm due to a load. Calculate the strain.

Case Study:- Read the following article, Questions to follow

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Multiple Choice

What was the primary cause of the Hyatt Regency walkway collapse?

• Hurricane

• Fire

• Structural overload resulting from design flaws

• Earthquake

Multiple Choice

How many people were injured in the collapse?

• 300

• 216

• 150

• 100

Multiple Choice

How many people were killed in the Hyatt Regency walkway collapse?

• 50

• 114

• 200

• 300

Multiple Choice

In which city did the Hyatt Regency walkway collapse occur?

• Chicago

• Kansas City

• Los Angeles

• New York

Multiple Choice

What year did the Hyatt Regency walkway collapse happen?

• 1981

• 1980

• 1982

• 1979

Multiple Choice

What was the main material used in the construction of the walkways?

• Brick

• Plastic

• Steel

• Wood

Multiple Choice

What was the immediate cause of the walkway collapse?

• Earthquake

• Design change in steel hanger rods

• Flood

• Fire

Multiple Choice

What was the original design flaw in the walkway?

• Improper lighting

• Insufficient support for the weight

• Lack of fire exits

• Incorrect material used

Multiple Choice

What was the response of the engineering community after the disaster?

• No changes were made

• Increased construction speed

• Increased focus on engineering ethics

• Decreased safety standards

Multiple Choice

What was the final outcome for the hotel after the collapse?

• It was demolished

• It was never reopened

• It was renovated and reopened

• It was converted into a museum

Factor of Safety

Open Ended

What do you think was the cause of these disasters?

Open Ended

What have you learnt from this lesson