Chapter Eight Exam Flashcards
When performing mechanical testing, reference should always be made to: (Multiple Choice)
Appropriate standard to make sure correct procedure is followed.
The strain in a body is a measurement of the:
Changes in dimension due to an applied load.
The modulus of elasticity for steel is usually taken as: (Multiple Choice)
200 000 MPa
What is defined by the yield point? (Multiple Choice)
Change from elastic to plastic deformation.
What is the relationship between the value E and the stress and strain defined as? (Multiple Choice)
Hookes Law
Young’s Modulus (E) is:
modulus of elasticity
Which mechanical test type requires polished and chemically etched specimens?
Metallographic tests.
When using fracture mechanics testing, the fracture behaviour of a material tested is dependent on:
Presence of a sharp crack.
When performing the drop weight test, the plate being tested contains:
Small weld bead of hardfacing metal deposited on it.
What is the drop weight test
Reducing sample size for testing? No maybe real world fracture testing?
CTOD testing of materials measures the resistance of the material to crack extension and depends on:
Thickness, temperature, and crack susceptibility? No. maybe toughnes temp and loading rate?
When is the nil-ductility temperature determined when a drop weight specimen breaks?
Max temperature.
What are the three types of guided bend tests used?
Root, face, and side bends.
CSA W47.1 uses the fillet weld break test to:
Reveal defects such as porosity, penetration or IP.
A nick-break test:
Reveal internal defects.
Bend testing can provide information regarding:
Weld soundness.
Rotating parts are proof tested by
Rotate at high speed to increase centrifugal stresses.
A proof test on a pressure vessel is safer using:
Water
Which of the following are two types of tests performed for corrosion evaluation?
Electrochemical and direct exposure testing.
Creep testing is:
High temp progressive deformation at constant stres.
Which hardness test method is best suited for use on thin samples?
Vickers
Which two test methods can be used for hardness measurements of relatively small areas?
Vickers and Rockwell.
The S/N curve shows the stress range against cycles to failure and is used to establish the fatigue life of:
Base material. NO ?
Which of the following discontinuities have the highest probability of leading to fatigue failure?
Overlap surface undercut, inclusions an dmicrocracks.
