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severity factor 硬[剛]度系數。

sevilla

Based on the aircraft structure fatigue theory , the article discussed the theoretical basis of methods that are usually used for aircraft structure fatigue crack - forming life estimation , i . e . the stress severity factor approach ( normal stress approach ) , the local stress & strain approach , detail fatigue rating approach ( dfr ) . also the processes of life estimation of these approaches are studied in the article 文章在簡要介紹飛機結構疲勞強度理論的基礎上,對目前飛機結構勞疲勞裂紋形成壽命估算常用的應力嚴重系數法(名義應力法) ,局部應力應變法,細節疲勞額定值dfr法的理論依據作了較詳細的論述,同時對這些估算方法進行壽命估算的過程與步驟也作了詳盡的闡述。