왜 계산에서 2차 응력의 제한 범위가 1차 응력의 범위보다 훨씬 큰가요?
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2차는 열상태가 아닌가요? 이런 경우에 왜 1차의 냉상태보다 제한이 더 낮지 않은 건가요?
미국의 규격에 있는 2차 응력 공식을 보면 알 수 있습니다
규범 요구사항.사실은 소성 변형을 방지하는 것입니다
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