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    • 1. 发明授权
    • Sacrificial specimen for use in monitoring long-term stress intensity of structure and method of using the same
    • 用于监测结构的长期应力强度的牺牲标本及其使用方法
    • US06289739B1
    • 2001-09-18
    • US09459893
    • 1999-12-14
    • Yukio FujimotoEiji ShintakuKunihiro Hamada
    • Yukio FujimotoEiji ShintakuKunihiro Hamada
    • G01N1908
    • G01M5/0033G01N2203/0066G01N2203/0664
    • A sacrificial specimen for use in monitoring a long-term stress intensity of a structure including a main body made of a metal and having an artificial crack formed at a central region thereof, and a pair of metal or synthetic resin thin plates each having a slit formed at a central region, said pair of thin plates being cemented together with interposing the main body therebetween such that said artificial crack is exposed outside through the slits. The sacrificial specimen is cemented onto a structure whose long-term stress intensity has to be monitored such that a central portion corresponding to the central regions of the main body and thin plates is not secured to the structure surface. When the sacrificial specimen is subjected to stress, the slits formed in the thin plates are deformed largely and a fatigue crack is produced in the main body such that the fatigue crack extends from the artificial crack. Stress applied to the sacrificial specimen is amplified and fatigue due to the amplified stress is accumulated in the sacrificial specimen, the long-term stress intensity of the structure can be monitored accurately.
    • 一种用于监测包括由金属制成的主体并且在其中心区域形成有人造裂纹的结构的长期应力强度的牺牲试样,以及一对具有狭缝的金属或合成树脂薄板 形成在中心区域,所述一对薄板被粘合在一起,将主体夹在其间,使得所述人造裂纹通过狭缝暴露在外部。 将牺牲试样粘结到需要监测其长期应力强度的结构上,使得对应于主体和薄板的中心区域的中心部分不固定到结构表面。 当牺牲试样受到应力时,形成在薄板上的狭缝变形很大,并且在主体中产生疲劳裂纹,使得疲劳裂纹从人造裂纹延伸。 施加到牺牲试样上的应力被放大,并且由于放大的应力而累积在牺牲试样中的疲劳,可以准确地监测结构的长期应力强度。