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1856年英国物理学家开尔文(load Kelvin)在指导铺设大西洋海底电缆时,发现了金属材料在压力和张力作用下会发生电阻变化的现象,金属材料的这种应变—电阻效应,是现今电阻应变计的基本原理.美国西蒙斯(Simmons)和鲁奇(Ruge)于1938年几乎同时发明了现今的电阻应变计,其后美国Baldwin-lima-HamiltonCorp取得了专利权生产应变计,并把产品以西蒙斯和鲁奇两人姓名的第一个字母命名为SR-4,以纪念西蒙斯和鲁奇及其助手们的功绩.
In 1856, the British physicist Kelvin Kelvin instructed the laying of the transatlantic submarine cable and found the phenomenon that the resistance changes under the pressure and the tension of the metal material. The strain-resistance effect of the metal material is the result of the current resistance strain The United States Simmons and Ruge invented today’s resistance strain gauges almost simultaneously in 1938, after which Baldwin-lima-Hamilton Corp. of the United States obtained a patented production strain gauge, The first letters of names Simmons and Lurgi were named SR-4 in honor of the merits of Simmons and Lutz and their assistants.