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首頁> 外文期刊>Key Engineering Materials >Fatigue Damage Accumulation of Welded Bridge Member during Crack Growth Propagation with Initial Crack
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Fatigue Damage Accumulation of Welded Bridge Member during Crack Growth Propagation with Initial Crack

機譯：初始裂紋在裂紋擴展中的焊接橋梁構(gòu)件疲勞損傷累積

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摘要

The crack growth behavior and the fatigue life of welded members with initial crack in bridges under traffic loading were investigated. Based on existed fatigue experiment results of welded members with initial crack and the fatigue experiment result of welded bridge member under constant stress cycle, the crack keeps semi-elliptical shape with variable ratio of a/c during crack propagation. The calculated method of the stress intensity factor necessary for welded bridge member crack propagation was discussed. The crack remained semi-elliptical shape with variable ratio of a/c during crack propagation. The fatigue crack propagation law suitable for welded steel bridge member fatigue crack propagation analysis was deduced based on the continuum damage mechanics and fracture mechanics. The proposed fatigue crack growth model was then applied to calculate the crack growth and the fatigue life of existed welded member with fatigue experimental result. The calculated and measured fatigue life was generally in good agreement, at suitable initial conditions of cracking, for welded member widely used in steel bridges.
機譯：研究了交通荷載作用下橋梁初始裂紋焊接構(gòu)件的裂紋擴展行為和疲勞壽命。根據(jù)已有裂紋初始焊接構(gòu)件的疲勞試驗結(jié)果和恒定應力循環(huán)下焊接橋梁構(gòu)件的疲勞試驗結(jié)果，裂紋在裂紋擴展過程中保持a / c的變化比為半橢圓形。討論了焊接橋構(gòu)件裂紋擴展所必需的應力強度因子的計算方法。在裂紋擴展過程中，裂紋保持為半橢圓形，a / c的比例可變?；谶B續(xù)損傷力學和斷裂力學，推導了適用于焊接鋼橋構(gòu)件疲勞裂紋擴展分析的疲勞裂紋擴展規(guī)律。然后，利用所提出的疲勞裂紋擴展模型，通過疲勞試驗結(jié)果計算了現(xiàn)有焊接構(gòu)件的裂紋擴展和疲勞壽命。對于廣泛用于鋼橋的焊接構(gòu)件，在適當?shù)拈_裂初始條件下，疲勞壽命的計算和測量結(jié)果通常吻合良好。

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