On the Relation Between Stress and Strain in the Impact Test

Yamada, Ryota

doi:10.1299/jsmemagazine.31.136_420

Cited by 8 publications

(3 citation statements)

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“…Yamada 12 and Watanabe 13 performed significant work in Japan during this time period. Yamada was able to optically measure the change in velocity of the pendulum during contact with the test specimen.…”

Section: Piezoelectricity and Oscillographs 1927 -1930mentioning

confidence: 97%

The History of Instrumented Impact Testing

Manahan

Siewert²

2006

Journal of ASTM International

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Pendulum impact testing is widely known to have a history that extends back to the turn of the last century. To many researchers today, instrumentation of the impact test to acquire a load-time history, and thereby provide important data in addition to absorbed energy, is usually considered to be a relatively recent development. However, our literature review has shown that starting from the earliest test machine development work, researchers have been interested in designing equipment capable of measuring both the energy expended in fracturing the specimen, as well as the force-deflection and energy-deflection curves. This paper recounts the early history of instrumented impact testing, and shows that it also extends back over 100 years. In fact, the earliest known paper on instrumented impact testing predates the first pendulum test machine publication by one year.

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Section: Piezoelectricity and Oscillographs 1927 -1930mentioning

confidence: 97%

The History of Instrumented Impact Testing

Manahan

Siewert²

2006

Journal of ASTM International

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“…This study was performed by Johnson and co-workers in the same forging shop as Massey used in 1921 to study this phenomenon [289]. From [290] Again Japanese researchers also appear to have been in the vanguard of those seeking to make dynamic fracture tests more quantitative [275][276][277][278][279][280].…”

Section: The Beginnings Of Serious High Strain Rate Testingmentioning

confidence: 99%

Highways and Byways in the History of High Rate Mechanical Testing

Walley

2020

J. dynamic behavior mater.

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Up until the Industrial Revolution, the dynamic mechanical properties of materials were only of importance in warfare, particularly after the powder-driven gun was invented. With the invention of the steam engine, the explosion of steam boilers (which is similar to the explosion of cannon) became a concern. When railways began to be built, the lack of knowledge of the dynamic properties of the iron alloys used in rails and railway bridges was understood to be a problem, but no way of measuring them was devised until the end of the nineteenth century. Ingenious mechanical (and later electromechanical) methods of recording signals onto rotating drums or moving smoked glass plates began to be developed from the middle of the nineteenth century onwards. Optical/photographic methods of recording information from dynamic experiments date from the 1890s. The rod-on-anvil technique (later named after Taylor) was developed in France at the beginning of the twentieth century but not mathematically analysed until the 1940s. The Hopkinson pressure bar was invented just before the start of the First World War and found to be useful in improving British artillery shells. It was then forgotten about until the Second World War when a two-bar version was developed for measuring the dynamic properties of soft materials such as explosives and polyethylene. As the story of high rate mechanical testing from about 1950 onwards is quite well known to the high rate testing community, this date is taken as the end point of this article. Keywords Isaac Newton • Ballistics • Taylor impact • Hopkinson bar • Spall • Adiabatic shear band Note on Imperial Units of Measurement Some quotes in this article are taken from British and American sources where Imperial Units of length and weight were used. For those unfamiliar with these units, the (approximate) conversion factors to the metric system are as follows: 1 in. is 25 mm; 1 ft. (= 12 in.) is 305 mm; 1 lb (abbreviation lb.) is 0.45 kg; 1 (British) ton (= 2240 lbs) is 1008 kg).

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“…After the instrumentation of the striker presented by R. Yamada in 1928 [7] in Japan, extensive development and quantitative in-terpretation of the results in conjunction with the development of fracture mechanics and use of precracked CVN specimens enabled derivation of dynamic strength and fracture toughness parameters by T. Kobayashi in 1980's [8]. After the instrumentation of the striker presented by R. Yamada in 1928 [7] in Japan, extensive development and quantitative in-terpretation of the results in conjunction with the development of fracture mechanics and use of precracked CVN specimens enabled derivation of dynamic strength and fracture toughness parameters by T. Kobayashi in 1980's [8].…”

Section: Introductionmentioning

confidence: 99%