List of 14 Different Mechanical Properties of Materials

What are the Material’s Properties?

When we talk about a material’s property, we’re referring to an intensive property in other words, it’s a physical trait that doesn’t change just because you have more or less of the material on hand.

These kinds of quantitative properties are actually quite useful: they give us a reliable way to compare one material to another, which comes in handy when you’re trying to figure out the best material for a specific purpose.

Interestingly, a material’s property isn’t always just a fixed number. It might remain constant, or it might change depending on factors like temperature or pressure.

Sometimes, you’ll even notice that the measured property can vary depending on the direction you measure it in the material. This directional dependence is called anisotropy, and it’s something materials scientists keep a close eye on.

Many of the properties tied to different physical phenomena tend to act in a linear fashion at least within certain operating conditions. Treating them as linear can really streamline the math involved, especially when using differential constitutive equations to describe how those properties behave.

To make things practical, equations based on material properties are often used to predict how a whole system will perform. But before any of that is possible, the properties themselves need to be measured, and this is typically done using standardized testing methods.

Many of these standards are put together by specialized groups ASTM International, for example and are widely shared online for anyone in the field to reference.

List of Mechanical properties of Materials

A description of some common mechanical and physical properties will provide information that product designers could consider in selecting materials for a given application.

• Conductivity
• Corrosion Resistance
• Density
• Ductility/Malleability
• Elasticity/Stiffness
• Fracture Toughness
• Hardness
• Plasticity
• Strength, Fatigue
• Strength, Shear
• Strength, Tensile
• Strength, Yield
• Toughness
• Wear Resistance

Expanding on those definitions:

1. Conductivity

Thermal conductivity essentially tells us how well a material can carry heat from one side to the other. It’s measured by seeing how much heat passes through a given thickness and area of the material in a set amount of time, for each degree of temperature difference.

If you’ve ever wondered why certain materials are used to keep things warm (or cool), it comes down to this property.

Materials with low thermal conductivity are chosen as insulators they slow down the flow of heat. On the other hand, those with high thermal conductivity are perfect as heat sinks because they move heat away quickly.

Take metals, for example. Because they tend to have high thermal conductivity, they’re often used in places like heat exchangers or refrigeration systems, where efficiently moving heat matters a lot.

But it’s not always black and white; sometimes you need a material that doesn’t conduct heat well, especially for parts exposed to high temperatures. The trick is understanding what the application needs sometimes high heat flow is helpful, sometimes you want to block it.

Electrical conductivity works on a similar idea, but instead of heat, it’s all about how easily electricity travels through a material. Again, we look at how much electric current moves through a material of a certain length and cross section.

2. Corrosion Resistance

When we talk about corrosion resistance, we’re essentially referring to how well a material can stand up to chemical or electrochemical attacks from things like moisture, air, or other environmental agents.

Corrosion isn’t just one thing it can show up in a bunch of different ways, such as pitting, galvanic reactions, stress corrosion, parting, and intergranular corrosion, to name a few. (And, honestly, each of these could have their own whole article we’ll touch on some of them in future newsletters.)

Now, if you’re trying to put a number on corrosion resistance, it’s often described in terms of how deep the corrosion would go over the course of a year, usually measured in mils.

This figure typically comes from a straight-line projection based on how the material performed during testing or real world use.

It’s worth noting that some materials just naturally hold up well against corrosion, while others might need a little help like a protective coating or plating.

But here’s the catch: even metals that are famous for their resistance aren’t completely immune. Given the right (or, really, the wrong) environmental conditions, just about any metal can end up corroding.

3. Density

Density is simply a measure of how much mass is packed into a given volume. You’ll often see it reported as pounds per cubic inch, grams per cubic centimeter, or similar units. In practical terms, density tells you how heavy an alloy will be, based on its size.

This property isn’t just a technical curiosity it’s a big deal in fields like aerospace and automotive engineering, where shaving off extra weight can have major benefits. If you’re an engineer aiming to lighten a component, you might gravitate toward alloys with lower densities.

Of course, you’d also need to think about the material’s strength relative to its weight; lighter isn’t always better if it means compromising on durability.

Sometimes, materials with higher density like steel are still the go to choice. That’s often because they offer greater strength compared to less dense alternatives.

In these cases, designers might offset the heavier material by using it more efficiently, perhaps by making parts thinner, so you use less of it overall.

4. Ductility/Malleability

Ductility refers to a material’s capacity to undergo significant plastic deformation essentially, to stretch without fracturing, and to retain its altered shape even after the applied force is removed. An everyday example of this property is the way certain metals can be drawn out into thin wires without snapping.

Engineers and scientists typically evaluate ductility through a tensile test, measuring it as either the percentage of elongation or the reduction in the cross sectional area just before the material fails.

These same tests often yield other valuable properties, such as Young’s Modulus (or modulus of elasticity), which represents the stress to strain ratio and plays a crucial role in design calculations.

One of the key reasons ductile materials are valued is their resistance to cracking or breaking under stress, which makes them well suited to metalworking methods like rolling and drawing. However, it’s worth noting that processes like cold working can reduce a metal’s ductility over time.

Closely related but distinct, malleability is another physical property that describes how well a metal can be formed or shaped without breaking, typically under compressive stress.

This characteristic becomes evident when a material is pressed or rolled into thinner sheets. Materials with high malleability can endure greater pressures without fracturing, which makes them especially useful in applications that require extensive reshaping.

5. Elasticity, Stiffness

Elasticity refers to how a material bounces back to its original shape and size once any force causing it to deform is taken away. Unlike materials with plasticity which stay deformed after the force is removed elastic materials spring back to how they were before the stress.

When we talk about how stiff a metal is, we usually look at something called Young’s Modulus. This value basically tells us how much a material will stretch or compress under a given force.

If a metal has a high Young’s Modulus, it means you have to apply a lot of force to get even a small change in its shape so it’s considered very stiff.

Take glass, for example: it’s known for being quite stiff, so it has a high Modulus. Rubber, on the other hand, is at the opposite end of the spectrum it’s much more flexible and has a low Modulus.

This difference really matters when engineers or designers need a material that can hold its shape under pressure.

6. Fracture Toughness

Impact resistance essentially refers to how well a material can handle sudden shocks or blows. When something collides with a material over a very short period, the force involved tends to have a much stronger effect compared to a gentler force that’s applied more gradually.

That’s why it’s important to keep impact resistance in mind, especially if the material will be used in situations where bumps, knocks, or other sudden impacts might occur.

It’s worth noting that some metals might hold up just fine when exposed to a constant or steady load, but those same materials could actually fail if they’re hit with a quick, dynamic force or if they’re part of a collision scenario.

To evaluate this in a controlled setting, labs commonly use what’s known as the Charpy test. In this method, a weighted pendulum is swung to strike a test sample right at the side that’s opposite a specially machined V-shaped notch.

This setup helps researchers gauge just how much impact energy the material can absorb before it breaks.

7. Hardness

When we talk about hardness, we’re essentially describing how well a material can stand up to things like dents or other permanent changes to its shape what scientists call plastic deformation.

If a material is hard, it generally means it’s better at holding its form and doesn’t wear down or get scratched easily. So, hardness isn’t just about how tough something is on the outside; it also tells us how much it can resist scratches, cuts, or surface damage.

To actually figure out how hard something is, there are a few common tests you might hear about Brinell, Rockwell, and Vickers.

These tests all work a bit differently, but the basic idea is the same: you press a hard object (like a steel ball or a diamond) into the material and measure how deep or wide the mark is. The smaller the dent, the harder the material.

8. Plasticity

Plasticity, unlike elasticity, refers to how some solid materials keep their new shape after being molded or formed. In other words, it’s the property that lets a material be bent, stretched, or worked into a different shape and then actually stay that way, rather than snapping back.

This shift from simply springing back (elastic behavior) to holding a new shape (plastic behavior) happens at what’s known as the yield point.

9. Strength-Fatigue

Fatigue is a phenomenon where a material can eventually fracture if it is subjected to repeated or fluctuating stresses even when those stresses remain below the material’s ultimate tensile strength.

Generally, the higher the applied stress, the sooner the material is likely to fail; the lower the stress, the longer it can endure. This inverse relationship between the applied stress and the number of cycles until failure is central to understanding fatigue behavior.

When we talk about the fatigue limit, we’re referring to the highest level of stress a metal can handle for a specific number of cycles without failing. In other words, it’s the stress threshold below which the material can theoretically withstand endless repetitions without breaking.

On the other hand, fatigue life is measured by keeping the load constant and observing how many cycles the material survives before it fractures. Both concepts fatigue limit and fatigue life are essential when it comes to designing parts that have to handle repetitive loading.

Understanding a material’s fatigue strength is crucial for ensuring long-term reliability and safety in components exposed to cyclic stresses.

10. Strength-Shear

Shear strength plays a key role in practical situations, such as with bolts or beams, where both the direction and the size of the applied force really matter.

In simple terms, shear happens when forces push in specific directions, causing the tiny grains within the metal to shift and slide past one another. This internal sliding at the granular level is what we recognize as shear.

11. Strength-Tensile

Tensile strength sometimes called ultimate strength is probably the metal property you’ll hear about most often. Basically, it’s a way of describing just how much pulling force a piece of metal can handle before it snaps.

In laboratory settings, when a metal sample is stretched, it’ll first lengthen a bit and then spring back into shape as long as it stays within its elastic range.

But once you push it past that elastic limit reaching what’s called the yield point the metal starts to change permanently.

At this stage, even if you take the force away, the metal keeps its stretched-out shape. Keep pulling, and you eventually hit the tensile point, where the metal simply breaks apart.

This property is key for telling apart metals that are more brittle (they break easily) from those that are ductile (they stretch more before breaking).

For reference, tensile strength is usually measured in units like Newtons per square millimeter (that’s Mega Pascals, or MPa) or in pounds per square inch, depending on where you are.

12. Strength-Yield

Yield strength, much like tensile strength, is a critical property when evaluating how a material behaves under stress. Specifically, yield strength refers to the point at which a material, once loaded, undergoes a change it cannot reverse it won’t snap back to its original shape. This is the stage where deformation shifts from being elastic (temporary) to plastic (permanent).

When engineers or designers run their calculations, the yield point serves as a key marker. It’s what lets them know just how much force a material can handle before it loses its dimensional stability.

For consistency, yield strength is reported in the same units as tensile strength: either Newtons per square millimeter (also known as megapascals, or MPa), or pounds per square inch.

13. Toughness

Toughness, much like impact resistance, is evaluated using the Charpy impact test, which essentially gauges how well a material can absorb sudden shocks without breaking especially at specific temperatures.

It’s important to note that many materials tend to become more brittle when exposed to lower temperatures, and their impact resistance drops accordingly.

In practice, Charpy values are especially significant when dealing with ferrous alloys, particularly in scenarios where equipment or structures might face cold environments think offshore oil platforms or long stretches of oil pipelines.

These measurements also come into play in situations where materials are exposed to quick, forceful loads, such as ballistic protection in military or aerospace settings.

So, having reliable Charpy impact data isn’t just about ticking boxes it’s about ensuring safety and performance in some of the most demanding conditions out there.

14. Wear Resistance

Wear resistance describes how well a material can cope when two surfaces are in contact and moving against each other. This isn’t limited to just one type of action; it covers everything from abrasion and adhesion to scratching, gouging, and even galling.

In practice, if you have two materials with different hardness levels, it’s usually the softer one that starts to show signs of wear first. That’s why engineers often factor in wear resistance when choosing materials for a project.

It’s not just sliding or scraping that matters even something as simple as rolling can lead to abrasion, especially if there’s dirt or other debris caught in between.

To get a sense of how wear-resistant a material actually is, a common approach is to run a controlled test: you cycle the materials against each other a set number of times at a specific load, then measure how much mass the sample lost. The less it loses, the better its wear resistance.

Other Mechanical properties

• Brittleness: Ability of a material to break or shatter without significant deformation when under stress; opposite of plasticity, examples: glass, concrete, cast iron, ceramics etc.
• Bulk modulus: Ratio of pressure to volumetric compression (GPa) or ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume
• Coefficient of restitution: The ratio of the final to initial relative velocity between two objects after they collide. Range: 0-1, 1 for perfectly elastic collision.
• Compressive strength: Maximum stress a material can withstand before compressive failure (MPa)
• Creep: The slow and gradual deformation of an object with respect to time. If the s in a material exceeds the yield point, the strain caused in the material by the application of load does not disappear totally on the removal of load. The plastic deformation caused to the material is known as creep. At high temperatures, the strain due to creep is quite appreciable.
• Durability: Ability to withstand wear, pressure, or damage; hard wearing
• Fatigue limit: Maximum stress a material can withstand under repeated loading (MPa)
• Flexibility: Ability of an object to bend or deform in response to an applied force; pliability; complementary to stiffness
• Flexural modulus
• Flexural strength: Maximum bending stress a material can withstand before failure (MPa)
• Friction coefficient: The amount of force normal to surface which converts to force resisting relative movement of contacting surfaces between material pair
• Mass diffusivity: Ability of one substance to diffuse through another
• Poisson’s ratio: Ratio of lateral strain to axial strain (no units)
• Resilience: Ability of a material to absorb energy when it is deformed elastically (MPa); combination of strength and elasticity
• Slip: A tendency of a material’s particles to undergo plastic deformation due to a dislocation motion within the material. Common in Crystals.
• Specific modulus: Modulus per unit volume (MPa/m^3)
• Specific strength: Strength per unit density (Nm/kg)
• Specific weight: Weight per unit volume (N/m^3)
• Stiffness: Ability of an object to resist deformation in response to an applied force; rigidity; complementary to flexibility
• Surface roughness: The deviations in the direction of the normal vector of a real surface from its ideal form
• Tensile strength: Maximum tensile stress of a material can withstands before failure (MPa)
• Viscosity: A fluid’s resistance to gradual deformation by tensile or shear stress; thickness
• Young’s modulus: Ratio of linear stress to linear strain (MPa)

Acoustical properties

• Acoustical absorption
• Speed of sound
• Sound reflection
• Sound transfer
• Third-order elasticity (Acoustoelastic effect)

Atomic properties

• Atomic mass: Applies to all elements. The average mass of the atoms of an element measured in atomic mass unit.
• Atomic number: Applies to pure elements only
• Atomic weight: Applies to individual isotopes or specific mixtures of isotopes of a given element

Chemical properties

• Corrosion resistance
• Hygroscopy
• pH
• Reactivity
• Specific internal surface area
• Surface energy
• Surface tension

Electrical properties

• Capacitance
• Dielectric constant
• Dielectric strength
• Electrical resistivity and conductivity
• Electric susceptibility
• Electrocaloric coefficient
• Electrostriction
• Magnetoelectric polarizability
• Nernst coefficient (thermoelectric effect)
• Permittivity
• Piezoelectric constants
• Pyroelectricity
• Seebeck coefficient

Magnetic properties

• Curie temperature
• Diamagnetism
• Hall coefficient
• Hysteresis
• Magnetostriction
• Magnetocaloric coefficient
• Magnetothermoelectric power (magneto Seebeck effect coefficient)
• Magnetoresistance
• Permeability
• Piezomagnetism
• Pyromagnetic coefficient
• Spin Hall effect

Manufacturing properties

• Castability: How easily a quality casting can be obtained from the material
• Machinability rating
• Machining speeds and feeds

Optical properties

• Absorbance: How strongly a chemical attenuates light
• Birefringence
• Color
• Electro optic effect
• Luminosity
• Optical activity
• Photoelasticity
• Photosensitivity
• Reflectivity
• Refractive index
• Scattering
• Transmittance

Radiological properties

• Neutron cross section
• Specific activity
• Half life

Thermal properties

• Binary phase diagram
• Boiling point
• Coefficient of thermal expansion
• Critical temperature
• Curie point
• Ductile to brittle transition temperature
• Emissivity
• Eutectic point
• Flammability
• Flash point
• Glass transition temperature
• Heat of vaporization
• Inversion temperature
• Melting point
• Thermal conductivity
• Thermal diffusivity
• Thermal expansion
• Triple point
• Vapor pressure
• Specific heat capacity

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