【摘要】：針對均質(zhì)材料A508合金鋼定義了可表征面內(nèi)/面外幾何拘束的統(tǒng)一拘束參數(shù)Ap,但在雙金屬接頭或異種金屬焊接接頭中,除了存在面內(nèi)/面外幾何拘束外,還存在材料性能失配引起的材料拘束。針對均質(zhì)材料定義的統(tǒng)一拘束參數(shù)Ap能否同時對幾何拘束與材料拘束進行表征還需要進一步的研究。采用有限元數(shù)值模擬的方法,對不同面內(nèi)、面外拘束的雙金屬接頭界面裂紋尖端的等效塑性應(yīng)變等值線所圍面積進行了計算;并用嵌含有GTN損傷模型的有限元法計算了不同拘束狀態(tài)下雙金屬接頭界面裂紋的J-R阻力曲線和延性斷裂韌性。之后,分析了Ap作為幾何拘束與材料拘束統(tǒng)一表征參數(shù)的可行性。結(jié)果表明:Ap可作為統(tǒng)一拘束參數(shù)對幾何拘束和材料拘束同時進行表征,并可用其建立雙金屬接頭中幾何拘束與斷裂韌性之間的統(tǒng)一關(guān)聯(lián)線。
[Abstract]:The uniform constraint parameter Ap, which can be characterized by in-plane / out-of-plane geometric constraint, is defined for homogeneous A508 alloy steel. However, in bimetallic joints or dissimilar metal welded joints, in addition to in-plane / out-of-plane geometric restraints, There is also material constraint caused by mismatch of material properties. It is necessary to study whether the uniform constraint parameter Ap can characterize both geometric constraint and material constraint at the same time. The area of equivalent plastic strain isoline at the crack tip of bimetallic joints in different plane and out of plane was calculated by finite element method. The J-R resistance curve and ductile fracture toughness of interfacial crack in bimetallic joints under different restraint states were calculated by finite element method with GTN damage model. Then, the feasibility of Ap as a unified parameter of geometric constraint and material constraint is analyzed. The results show that Ap can be used as a uniform constraint parameter to characterize both geometric constraint and material constraint, and it can be used to establish a unified correlation line between geometric constraint and fracture toughness in bimetallic joints.
【作者單位】： 上海理工大學能源與動力工程學院化工過程機械研究所;華東理工大學機械與動力工程學院承壓系統(tǒng)與安全教育部重點實驗室;環(huán)境保護部華東核與輻射安全監(jiān)督站;
【基金】：上海市自然科學基金(15ZR1429000) 上海高校青年教師培養(yǎng)計劃項目(No.ZZslg15013)資助~~
【分類號】：TG407

【參考文獻】

相關(guān)期刊論文 前1條

1 楊新岐,秦紅珊,霍立興,張玉鳳;非匹配焊接接頭中裂紋尖端三維拘束狀態(tài)分析[J];機械強度;2001年03期

【共引文獻】

相關(guān)期刊論文 前7條

1 楊杰;王國珍;王藝o，

本文編號：2419429