When it comes to material property there are many terms like toughness, stiffness, resilience, hardness,elasticity etc. So what does one compare between two samples in order to determine the mechanical superiority without any conflict?
Also is it possible that, avoiding all these above terminologies - using just the numerical values of Young's modulus, yield stress (and ultimate stress) to decide which one's better?
A materials scientist takes materials as the basis of activities; the designer takes the functional and/or manufacturing requirements as the basis of activities. It may seem rather obvious to link the essential functional and/or manufacturing properties to an essential material property. However, there is no theoretical foundation for this link. Besides, a product with one essential functional property or requirement is rare. So materials selection, even only on the basis of mechanical properties, is not the outcome of a mathematical formula. This means that for a given product one mechanical property may prevail, while for another design problem another mechanical property can be decisive. Note that often specifc values (i.e. values divided by the relative density) play an important role in materials selection. See for a further discussion of materials selection and its three different approaches:
Chapter 11 of Materials Science in Design and Engineering
Pieter van Mourik, Jaap van Dam & Stephen J. Picken
DAP/VSSD, Delft NL, 2012, 468 p.
http://www.vssd.nl/hlf/m017.htm
ISBN 978 90 6562 301 0
Dear Srujan Singh
Another question shines through your original question: Are material properties interrelated? A material property can be defined as any measurable aspect that links a material to a functional or manufacturing requirement. The measurement can either be quantitative (strength) or qualitative (colour). Properties that primarily depend on the extent and/or composition of the assemblies of atoms forming the material are called extrinsic properties, while properties depending on the behaviour of the atoms are called intrinsic properties. Strength is an example of an extrinsic property, but Young's modulus is an intrinsic property. The Grüneisen constant interrelates some intrinsic properties. So it is almost impossible to rationalize combinations of Young's modulus with different values of strength. Again, for a proper materials selection one has to link the functional of manufacturing requirements to the most obvious materials properties.
A further discussion of the above issues can be found in
Chapter 2 of Materials Science in Design and Engineering
Pieter van Mourik, Jaap van Dam & Stephen J. Picken
DAP/VSSD, Delft NL, 2012, 468 p.
http://www.vssd.nl/hlf/m017.htm
ISBN 978 90 6562 301 0
- Badges
- Science topic
- Similar topics
- Comment