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Material Properties and Testing Overview
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Material Properties and Testing Overview
Material Properties and Testing Overview
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1
Question
What is the focus of Material (Bahan) in this document?
Answer
Properties of material and their influence on manufacturing and use
2
Question
In the HAZ graph, which parameter is plotted on the x-axis?
Answer
Carbon content (%)
3
Question
What are the two labeled hardness areas in the HAZ diagram?
Answer
Maximum hardness and minimum hardness
4
Question
What are the two main subcategories of ferrous materials?
Answer
Steel and cast iron
5
Question
How is non-metallic material Keramik typically defined in this document?
Answer
Typically a compound of metal and non-metal elements like oxygen, nitrogen, and carbon
6
Question
What is the difference between Keramik kristalin and Keramik Gelas according to the document?
Answer
Crystalline ceramics formed by sintering vs glass ceramics formed by melting and casting
7
Question
Give one example of a Thermoplastic polymer from the document.
Answer
Polyethylene (also polystyrene, polyvinyl chloride, nylon)
8
Question
What is a composite material as described in the document?
Answer
A material made from two or more phases to achieve superior properties
9
Question
Which properties are listed as important physical properties to consider in design?
Answer
Specific heat, thermal conductivity, thermal expansion, electrical conductivity, magnetic response, density, melting point, light reflection
10
Question
What is a composite in nonmetallic materials and its basic structure?
Answer
A composite is a material made of two or more phases (particles or fibers in a matrix) to achieve superior properties.
11
Question
What thermophysical properties are listed for thermal and electric behavior in the diagrams, and what do they measure?
Answer
Heat capacity, thermal expansion, thermal conductivity (heat flow), electrical conductivity, and related electrical properties; they measure how materials store heat, expand with temperature, conduct heat, and conduct electricity.
12
Question
Describe the difference between true stress-true strain and engineering stress-engineering strain curves.
Answer
Engineering curves measure nominal stress/strain during load; true curves account for actual area and length changes, often yielding higher strains and different stress.)
13
Question
List common hardness tests mentioned and a brief purpose.
Answer
Brinell, Rockwell, Vickers, Knoop, Mohs, Durometer (rubber), IRHD (rubber) — measure resistance to indentation, wear, or scratching.
14
Question
What are the standard references associated with Brinell hardness testing per the document?
Answer
ISO 6506 parts 1–3 and ASTM E10.
15
Question
Name three common hardness tests.
Answer
Brinell, Rockwell, Vickers.
16
Question
What materials are typically tested with Rockwell hardness?
Answer
Metallic alloys and steels (and similar materials) across scales.
17
Question
What does HV stand for in Vickers hardness testing?
Answer
Hardness value from Vickers test.
18
Question
What standard is associated with Vickers hardness testing for the micro and macro range?
Answer
ASTM E384 and ISO 6507-1,2,3.
19
Question
What is a key advantage of the Rockwell superficial test?
Answer
Rapid, direct readout, non-destructive.
20
Question
What does the term “strain hardening” describe in metals?
Answer
Strengthening of a metal with plastic deformation.
21
Question
What does true stress-true strain show compared to engineering stress-strain?
Answer
Accounts for actual cross-sectional area and length after deformation.
22
Question
What does a larger strain hardening exponent n imply in the true stress-true strain relation?
Answer
More strengthening for a given strain.
23
Question
What is the purpose of the Knoop hardness test?
Answer
Determine surface area hardness using a diamond indenter (HK) value
24
Question
What is the formula provided for Knoop hardness?
Answer
HK = 14.229 (F/A) (kg/mm²)
25
Question
Which standards are associated with organic coating hardness testing in the document?
Answer
ASTM D1474 and ASTM D785
26
Question
What does the Charpy impact test measure?
Answer
Energy to rupture of a notched specimen (impact energy)
27
Question
What are the two common impact test methods mentioned?
Answer
Charpy and Izod impact tests
28
Question
What is the main difference between Charpy and Izod tests as implied by their descriptions?
Answer
Test specimen orientation (notch placement) and energy-rupture relationship
29
Question
What does Fatigue test assess in materials?
Answer
Failure under cyclic loading
30
Question
What does the endurance limit represent?
Answer
Reduced material strength under cyclic loading above which fatigue failure does not occur