Temperature Dependence of Very High Temperature Vacuum Tensile-Fatigue and Tensile Strengths in Drawn Tungsten Wire

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概要

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• Tensile-fatigue and tensile tests of drawn tungsten wire (diameter 0.30 mm : JIS-H4461. VWW1-D) at very high temperature (800-2700℃) in vacuum (pressure 10^<-5> mmHg) were made using a very high temperature vacuum tensile-fatigue tester of electrical current transite heating type [J. JSMS, Vol. 16 (1967), P. 89]. And temperature-dependences of fatigue and tensile strengths were studied. The main results obtained are as follows : (1) According to the increase of testing temperature, the tendency of necking in the specimen becomes weak and the deformed range increases. (2) Relation between testing temperature T and tensile strength σ_o to cause the fracture is expressed by log_<10> [σ_o (kg/mm^2)]=AT+B, A=-6.7×10^<-3o>K and B=2.40. (3) Relation among testing temperature T, cyclic stress σ and the number N of stress cycles to cause the failure is expressed by log_<10>N=αT+βlog_<10>[σ (kg/mm^2)]+γ, α=-3.56×10^<-3o>K, β=-3.4×10^<-3>, and γ=1.45.

• 一般社団法人日本機械学会の論文

著者

• Matsushima Shigeo

  Department Of Mechanical Engineering The Defense Academy

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