一、前言随着我国飞机制造业等的发展,要求应力、应变测试枝术要有相应的发展,中温大变形量应变电阻合金丝的研制,就是航空部某单位提出的科研任务。要求这种丝材制成的应变片,能在室温～250℃的范围内测定应变量达到4％以上。 1969年英国R·Bertodo曾发表了研究类似的应变丝及应变计的结果,为以后的研究工作提供了经验,所研制的应变计可在400℃下工作,但变形量为±1.5％。大变形量应变计,在美国、日本等国虽然早已有正常商品出售,但从近期这些国家公布的样本看,大都限于204℃以下工作的大变形量应变计。国内中温大变形量应变计及应变丝材都处于首次研制状态,因此这是一项新的应变 I. INTRODUCTION With the development of China’s aircraft manufacturing industry and other requirements, stress and strain testing should be developed accordingly. The development of strain resistance alloy wire with large deformation in mid-temperature is a scientific research task proposed by a unit of Ministry of Aviation. The strain gauge made of such a wire is required to measure a strain amount of 4% or more at room temperature to 250 ° C. In 1969, the British R. Bertodo published a study of similar strain gauges and strain gauges, which provided experience for further research work. The strain gauges developed at 400 ° C with a deformation of ± 1.5% are available. Large deformation strain gauge, although the United States, Japan and other countries already have normal sales of goods, but the recent national release of these samples, mostly limited to work below 204 ℃ large deformation strain gauge. Large deformation in the domestic strain gauge strain and strain wire are in the first state of development, so this is a new strain