【摘要】：以45°傾角全熔透承載角焊縫十字接頭為研究對(duì)象,在試件的邊緣焊趾附近構(gòu)造深度分別為1和2mm的2種人工半球形蝕坑,通過疲勞試驗(yàn)和有限元方法分析腐蝕對(duì)斜焊縫十字接頭疲勞行為的影響。結(jié)果表明:當(dāng)蝕坑深度分別為0,1,和2mm時(shí),在200萬次循環(huán)加載下斜焊縫十字接頭疲勞強(qiáng)度分別為92.4,91.3和70.2 MPa,當(dāng)蝕坑深度等于或小于1mm時(shí),可以忽略蝕坑對(duì)斜焊縫十字接頭疲勞強(qiáng)度的影響,但選取斜焊縫十字接頭的S—N曲線時(shí)應(yīng)該考慮不同腐蝕程度的影響;蝕坑深度是影響斜焊縫十字接頭疲勞強(qiáng)度的主要因素,在蝕坑半徑相同情況下蝕坑越深,等效應(yīng)力越大,應(yīng)力集中越明顯;由于熱點(diǎn)應(yīng)力集中系數(shù)與蝕坑深度的相關(guān)性要好于深寬比,且非線性函數(shù)優(yōu)于線性函數(shù),因此推薦采用非線性函數(shù)擬合熱點(diǎn)應(yīng)力集中系數(shù)與蝕坑深度的關(guān)系。
[Abstract]:Taking 45 擄angle fully permeable angle weld cross joint as the research object, two kinds of artificial hemispherical pits with structural depths of 1 and 2mm near the edge of the weld toe of the specimen were studied. The effect of corrosion on fatigue behavior of cross joint of oblique weld was analyzed by fatigue test and finite element method. The results show that when the depth of the pit is 0 ~ 1 and 2mm, the fatigue strength of cross joint of oblique weld under 2 million cyclic loading is 91.3 and 70.2 MPA, respectively. When the depth of the pit is equal to or less than 1mm, the fatigue strength of the cross joint is 92. 4 and 72. 2 MPa, respectively, when the depth of the pit is equal to or less than 1mm. The influence of corrosion pit on fatigue strength of cross joint of oblique weld can be neglected, but the influence of different corrosion degree should be considered when selecting S-N curve of cross joint of oblique weld, the depth of corrosion pit is the main factor that affects fatigue strength of cross joint of oblique weld, The deeper the pit is, the greater the equivalent stress is, and the more obvious the stress concentration is, the better the correlation between the stress concentration coefficient of hot spot and the depth of the pit is, and the nonlinear function is better than the linear function. Therefore, nonlinear function is recommended to fit the relationship between stress concentration factor and pit depth.
【作者單位】： 寧波大學(xué)建筑工程與環(huán)境學(xué)院;西南交通大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51378430,51378431,51708305) 浙江省自然科學(xué)基金資助項(xiàng)目(LQ17E080005)
【分類號(hào)】：U441.4
，

本文編號(hào)：2144375