Woehler Driver

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SUBJECT AREA:Metallurgy

b. 22 June 1819 Soltau, Germany

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German railway engineer who first established the fatigue fracture of metals.

Wöhler, the son of a schoolteacher, was born at Soltau on the Luneburg Heath and received his early education at his father's school, where his mathematical abilities soon became apparent. He completed his studies at the Technical High School, Hannover.

In 1840 he obtained a position at the Borsig Engineering Works in Berlin and acquired there much valuable experience in railway technology. He trained as an engine driver in Belgium and in 1843 was appointed as an engineer to the first Hannoverian Railway, then being constructed between Hannover and Lehrte. In 1847 he became Chief Superintendent of rolling stock on the Lower Silesian-Brandenhurg Railway, where his technical abilities influenced the Prussian Minister of Commerce to appoint him to a commission set up to investigate the reasons for the unusually high incidence of axle failures then being encountered on the railways. This was in 1852, and by 1854, when the Brandenburg line had been nationalized, Wöhler had already embarked on the long, systematic programme of mechanical testing which eventually provided him with a clear insight into the process of what is now referred to as 'fatigue failure'. He concentrated initially on the behaviour of machined iron and steel specimens subjected to fluctuating direct, bending and torsional stresses that were imposed by testing machines of his own design.

Although Wöhler was not the first investigator in this area, he was the first to recognize the state of 'fatigue' induced in metals by the repeated application of cycles of stress at levels well below those that would cause immediate failure. His method of plotting the fatigue stress amplitude 'S' against the number of stress cycles necessary to cause failure 'N' yielded the well-known S-N curve which described very precisely the susceptibility to fatigue failure of the material concerned. Engineers were thus provided with an invaluable testing technique that is still widely used in the 1990s.

Between 1851 and 1898 Wöhler published forty-two papers in German technical journals, although the importance of his work was not initially fully appreciated in other countries. A display of some of his fracture fatigue specimens at the Paris Exposition in 1867, however, stimulated a short review of his work in Engineering in London. Four years later, in 1871, Engineering published a series of nine articles which described Wöhler's findings in considerable detail and brought them to the attention of engineers. Wöhler became a member of the newly created management board of the Imperial German Railways in 1874, an appointment that he retained until 1889. He is also remembered for his derivation in 1855 of a formula for calculating the deflections under load of lattice girders, plate girders, and other continuous beams resting on more than two supports. This 'Three Moments' theorem appeared two years before Clapeyron independently advanced the same expression. Wöhler's other major contribution to bridge design was to use rollers at one end to allow for thermal expansion and contraction.

Bibliography

1855, 'Theorie rechteckiger eiserner Brückenbalken', Zeitschrift für Bauwesen 5:122–66. 1870, 'Über die Festigkeitversuche mit Eisen und Stahl', Zeitschrift für Bauwesen 20:73– 106.

Wöhler's experiments on the fatigue of metals were reported in Engineering (1867) 2:160; (1871) 11:199–200, 222, 243–4, 261, 299–300, 326–7, 349–50, 397, 439–41.

R.Blaum, 1918, 'August Wöhler', Beiträge zur Geschichte der Technik und Industrie 8:35–55.

——1925, 'August Wöhler', Deutsches biographisches Jahrbuch, Vol. I, Stuttgart, pp. 103–7.

K.Pearson, 1890, 'On Wöhler's experiments on alternating stress', Messeng. Math.

J.Gilchrist, 1900, 'On Wöhler's Laws', Engineer 90:203–4.

Biographical history of technology. - Taylor & Francis e-Librar. Lance Day and Ian McNeil. 2005.

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Retrotec is excited to reveal that the deal between Retrotec Inc. and Wöhler Technik, a technology applications company, is finalized! The new company, “Wohler Retrotec, Inc.” continues to do business as “Retrotec.”

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Wöhler is a well-respected German company specializing in measuring instruments, inspection systems, cleaning tools, and related heating, ventilation, and building applications.

Retrotec founder, Colin Genge, spent decades strengthening the blower door, duct testing, and clean agent enclosure integrity industries. With Retrotec experiencing unmatched and continued growth, Colin Genge’s decision to retire provided Retrotec with an opportunity to find a strategic partner to further expand into even wider-ranging markets. The decision to pair with Wöhler Technik came as an unmatched opportunity.

While the acquisition stands to provide future opportunities in related industries, Wöhler and Retrotec continue to run as separate entities, with no changes in Retrotec's branding, distribution network, and daily business operations.

You can read the official Press Release below:

Wohler Technik, GmbH. Acquires Retrotec, Inc.

Wöhler Technik GmbH is pleased to announce the acquisition of Retrotec Inc, effective May 1, 2017. Managing Directors Ben Walker and Darren Kennedy will continue to run the operations. A new company titled, “Wohler Retrotec, Inc.” will be formed.

The German enterprise Wöhler was founded in 1932 and since then has earned an international reputation as a manufacturer of high quality measurement instruments for the Building and HVAC industries. The product lines of both companies include Blower Door Systems and leakage testers, which will perfectly complement each other. “Especially the professional customers of Wöhler and Retrotec Inc will benefit from the collaboration of these two experts who join their know-how and experience” comments Johannes Lötfering, managing director of Wöhler Technik GmbH. Air tightness and enclosure integrity will play an even more significant role in the future because of the increasing demands on energy efficiency. For this reason, the requirements regarding the measurement technology will increase respectively.

The deal is a win-win for both parties, because it will help both companies gain unique competitive advantages in their core markets. Wohler Retrotec Inc. will fortify the technological lead of the brands Retrotec and Wöhler and both brands will continue to exist independently. Thus, the companies’ good relationship to customers and suppliers will remain the same. Retrotec managers, Ben Walker and Darren Kennedy, will run the operations and thereby guaranty continuity for the staff. Wohler Retrotec Inc will continue to benefit from the know-how and expertise of the founder and previous owner of Retrotec Inc for 37 years, Colin Genge, who will continue as advisor to the company.

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About Wöhler Technik, GmbH.

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Wöhler Technik, GmbH. manufactures and sells numerous products related to measurement & testing technology, inspection systems, cleaning tools, and related heating, ventilation, and building applications.

As an internationally operating family business, Wöhler Technik maintains a partnership with customers and suppliers. This trusting collaboration, combined with a strong passion for technology, proves to be the ideal basis for sustained growth.

About Retrotec

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Retrotec, Inc. is the world's leading manufacturer of building diagnostic tools. Retrotec’s product line includes blower door systems, air tightness testing equipment, duct testing systems, and air tightness testing software. Retrotec equipment is used around the world, by demanding professionals, to conduct residential energy audits, large building leakage tests, duct leakage tests, and clean agent integrity tests.