Characteristics of Strength and Fracture in Strength Mismatched Joint by Dynamic Loading

An, Gyu-Baek; Mochizuki, Masahito; Ohata, Mitsuru; Bang, Han-Sur; Toyoda, Masao

Journal of KWJS 2003;21(6):55-63.
Published online October 27, 2003.

[연구논문] 동적하중 하에서의 강도적 불균질부를 갖는 용접이음재의 강도및 파괴 특성

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Characteristics of Strength and Fracture in Strength Mismatched Joint by Dynamic Loading

Gyu-Baek An, Masahito Mochizuki, Mitsuru Ohata, Han-Sur Bang, Masao Toyoda

Abstract

Welded joint generally has heterogeneity of strength, material, and fracture toughness and it is important to understand the characteristics of material strength and fracture of welded joint considering heterogeneous effect. Characteristics of strength and fracture of an undermatched joint under dynamic loading was studied by round-bar tension tests and thermal elastic-plastic analyses in this paper. The strength and fracture of the undermatched joints should be evaluated based on the effects of the strain rate and the temperature including temperature rise during the dynamic loading. The differences of fracture characteristics like such as ductile-to-brittle transition behavior are well precisely explained tram the stress-strain distribution obtained by numerical analysis.