Tensile strength is one of the most important mechanical properties in industrial design and material selection. It indicates the ability of a material to withstand forces that tend to elongate or fracture it.
In this 2026 guide, we shall examine everything worth knowing about tensile strength: from the definition and units of measurement, to the formula and test methods, through to the principal factors that influence it and the strategies for improving it.
What is Tensile Strength
Tensile strength is the maximum stress that a material can withstand before fracturing when subjected to a tensile force, that is, a force that tends to elongate it along an axis.
In practical terms: it measures how much resistance a material can offer before failure.
It is typically expressed in megapascals (MPa).
Tensile stress is calculated as follows:
σ = F / A
Where:
σ = stress (MPa)
F = applied force (N)
A = original cross-sectional area (mm²)
The ultimate tensile strength corresponds to the highest point reached on the stress–strain curve prior to fracture.
The standard method for measuring tensile strength is the tensile test, governed by international standards such as:
In steels, the addition of alloying elements such as carbon, manganese, chromium, and nickel increases tensile strength.
As temperature rises, the tensile strength of metals tends to decrease. For this reason, components operating at elevated temperatures (such as turbines, furnaces, and engines) employ purpose-designed superalloys.
Inclusions, porosity, and surface defects act as stress concentrators and reduce the effective strength of the actual component relative to the theoretical value of the material.
Processes such as quenching, tempering, and annealing profoundly alter the microstructure of a material and, consequently, its mechanical properties. Correct quenching can raise the tensile strength of a steel from 500 MPa to in excess of 1,500 MPa.
Casting, CNC machining, and additive manufacturing all influence microstructure. Cold working induces residual stresses and modifies the grain structure, generally increasing tensile strength whilst reducing ductility.
|
Material |
Tensile Strength (MPa) |
|
Pure aluminum (1050) |
75-115 MPa |
|
Aluminum Alloy 6061-T6 |
290-310 MPa |
|
Mild steel (S235) |
360-510 MPa |
|
515-820 MPa |
|
|
Tool steel (H13) |
1,000-1,400 MPa |
|
Titanium (Ti-6Al-4V) |
895-1,000 MPa |
|
Carbon fibre (CFRP) |
600-3,500 MPa |
|
Nylon 66 |
70-85 MPa |
|
Concrete (compressive) |
20-50 MPa |
Concrete has very low tensile strength (approximately 1/10 of its compressive strength), which is why it is always reinforced with steel in structural applications.
If you are designing a component and need to increase its tensile strength, the following strategies are the most effective:
Tensile strength is one of the fundamental parameters for assessing the mechanical behaviour of a material.
Understanding it enables engineers to select the correct material, prevent fractures, design more efficient components, and optimise both safety and performance. Whether working with metals, polymers, composites, or additive manufacturing, tensile strength remains one of the primary reference parameters in materials engineering.
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Yield strength indicates the point at which a material begins to deform permanently, whilst tensile strength indicates the maximum stress the material can sustain prior to fracture.
In other words, yield strength is the threshold beyond which the component no longer returns to its original shape, whilst tensile strength represents the maximum load the material is able to bear during a tensile test.
It is calculated by dividing the maximum force applied during the tensile test by the original cross-sectional area of the specimen:
σ = F / A
Where F is the maximum force in newtons and A is the original cross-sectional area in mm². The result is expressed in MPa (N/mm²).
Tensile strength is the ability of a material to withstand an applied tensile force prior to fracture. It is one of the principal parameters used to assess the mechanical performance of metals, plastics, and other engineering materials.
Tensile strength represents the maximum stress sustained by the material during the tensile test. Breaking load, by contrast, refers to the actual force that causes fracture of the specimen.
Materials with high tensile strength include high-strength steels, titanium, certain aluminium alloys, carbon fibre composites, and specific engineering polymers. The selection depends upon the application, the required weight, and the service environment.
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