engineering

Johan August Brinell

Johan August Brinell is a engineering topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Johan August Brinell rather than just read about it. In short: August Brinell (10 October 1849 – 17 November 1925) was a Swedish metallurgical engineer. Brinell is noted as the creator of a method for quantifying the surface hardness of materials, now known as the Brinell hardness test.

Key takeaways

Johan August Brinell belongs to engineering; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Johan August Brinell to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Johan August Brinell from memory before moving on to harder problems.

Reference excerpt

August Brinell (10 October 1849 – 17 November 1925) was a Swedish metallurgical engineer. Brinell is noted as the creator of a method for quantifying the surface hardness of materials, now known as the Brinell hardness test. His name is also commemorated in the description of a failure mechanism of material surfaces known as Brinelling.

Biography Brinell was born in Bringetofta, Nässjö Kommun, Sweden. He began his career as an Engineer at the Lesjöfors Ironworks and in 1882 became chief engineer at the Fagersta Ironworks. In 1903 he became Chief Engineer at Jernkontoret, the Swedish Ironmasters' Association. He remained at that post until 1914. Brinell was elected a member of the Royal Swedish Academy of Sciences in 1902, and of the Royal Swedish Academy of Engineering Sciences in 1919. He was awarded the Bessemer Gold Medal of the Iron and Steel Institute in 1907. He died of pneumonia in 1925 in Stockholm.

Legacy Brinell is best known today for the Brinell hardness test, which he proposed in 1900. In this test a 10-millimetre (most commonly) diameter tungsten carbide ball is pushed into the surface of the material being tested, by a 3,000 kgf load. Although the 10mm indenter ball and 3,000kgf is the most frequent diameter and load combination used in Brinell testing, the test actually allows the utilisation of a wide range of loads and indenter diameters to maximise its applicability. The diameter of the resulting indentation is directly related to the hardness of the metal (the wider the indentation the softer the material) and by means of the Brinell equation a hardness value expressed as numerals followed by HBW for Hardness Brinell Wolfram (Wolfram being an alternative name for tungsten carbide)) is arrived at:

In this equation ‘P’ is the applied load, typically measured in kilograms-force (kgf). ‘D’ is the diameter of the indenter ball in millimeters (mm) and ‘d’ is the diameter of the resulting indentation in millimeters (mm). It is a rapid, non-destructive (except at the surface being tested) means of determining the hardness of metals. His test remains in wide use today as it is the best for determining the macro-hardness of materials with coarse grain structures such as castings and forgings. This is because the relatively large indentations, typically 2.4mm - 6mm in diameter, are unaffected by the grain structure of the material under test. Brinell testers are therefore found in forges and foundries all over the World. Brinell testing requires that indentation diameters be measured with a low powered microscope, so it is susceptible to errors by workshop technicians who must exercise their judgement as to where the edges of the indentation are (the test requires the measurement of diameters across x and y axes and the calculation of the mean) but a collaboration in the early 1980s between the University of Birmingham (United Kingdom) and the British metrological research and manufacturing company Foundrax Engineering Products, produced an automatic microscope which overcame this weakness.

External links

Complete Dictionary of Scientific Biography Svenskt porträttgalleri. XVII. - Stockholm, 1905, Brinell, Johan August

References

Illustrations

Worked examples

Example 1 — a first encounter with Johan August Brinell

Start with the simplest possible case. Write down what Johan August Brinell claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Johan August Brinell before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Johan August Brinell ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Johan August Brinell

In research: Johan August Brinell appears in engineering research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Johan August Brinell in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Johan August Brinell is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1849 births, 1925 deaths, Bessemer Gold Medal, so understanding it makes those chapters shorter.
In everyday life: Look for Johan August Brinell outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

Ask Teacher Smith questions about this articleOpens your AI tutor with a question about “Johan August Brinell” →

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Johan August Brinell in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Johan August Brinell means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Johan August Brinell out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Johan August Brinell in simple terms?

Why does Johan August Brinell matter?

Because it connects several engineering ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Johan August Brinell?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Johan August Brinell.