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굽힘하중을 받는 분기관의 소성 붕괴 하중에 항복응력과 탄성계수의 비가 미치는 영향
정하주(Hajoo Chung),이국희(Kuk-Hee Lee),명만식(Man-Sik Myung),김윤재(Yun-Jae Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
This paper quantifies the effect of the yield strength-to-elastic modulus ratio on plastic collapse and instability loads for branch piping junctions under in-plane and out-of-plane bending. The finite element limit analyses based on elastic?perfectly-plastic materials using the large geometry change option provide plastic collapse loads (using the twice-elastic-slope method) and instability loads, and the plastic limit loads are determined from FE limit analyses using the small geometry change option. The plastic collapse loads and instability loads for branch pipe under bending are lower than limit loads. And the effect of internal pressure on plastic collapse and instability loads has been investigated. A wide range of parameters related to the bend geometry is considered.