Fatigue strengthening of damaged steel members using wire arc additive manufacturing

被引：30

作者：

Ghafoori, E. ^{[1
,2
,3
,4
]}

Dahaghin, H. ^{[5
]}

Diao, C. ^{[2
]}

Pichler, N. ^{[1
,3
]}

Li, L. ^{[1
,3
]}

Mohri, M. ^{[1
]}

Ding, J. ^{[2
]}

Ganguly, S. ^{[2
]}

Williams, S. ^{[2
]}

机构：

[1] Empa, Swiss Fed Labs Mat Sci & Technol, CH-8600 Dubendorf, Switzerland

[2] Cranfield Univ, Welding Engn & Laser Proc Ctr, Cranfield MK43 0AL, Beds, England

[3] Swiss Fed Inst Technol, Inst Struct Engn, CH-8093 Zurich, Switzerland

[4] Leibniz Univ Hannover, Inst Steel Construct, Hannover, Germany

[5] Univ Tehran, Sch Civil Engn, 16th Azar St, Tehran, Iran

来源：

ENGINEERING STRUCTURES | 2023年 / 284卷

基金：

瑞士国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

Metal; 3D-printing; Hybrid manufacturing; Fatigue repair; Fatigue life extension; Crack arrest; INHERENT STRAIN METHOD; SHAPE-MEMORY ALLOY; WELDING DISTORTION; DEBONDING FAILURES; CRACK ARREST; CFRP; MODE; DEFORMATION; SIMULATION; PREDICTION;

D O I：

10.1016/j.engstruct.2023.115911

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

In this study, a directed energy deposition (DED) process called wire arc additive manufacturing (WAAM) is employed for the fatigue strengthening of damaged steel members. Three steel specimens with central cracks were tested under a high-cycle fatigue loading (HCF) regime: (1) the reference specimen; (2) the WAAM-repaired specimen with an as-deposited profile, and (3) the WAAM-repaired specimen machined to reduce stress concentration factors (SCF). The corresponding finite element (FE) simulation of the WAAM process was calibrated using static experimental results, which revealed the main mechanism. The process was found to introduce compressive residual stresses at the crack tip owing to the thermal contraction of the repair. The FE results also revealed that stress concentration exists at the root of the as-deposited WAAM; this stress concentration can be mitigated by machining the WAAM to a pyramid-like shape. The fractography analysis indicated that the cracks were initiated at the WAAM-steel interface, and microscopic observations revealed that the microcracks were arrested by the porosities in the melted interface. The results of this pioneering study suggest that WAAM repair is a promising technique for combating fatigue damage in steel structures.

引用

页数：16

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