Experimental investigations of fracture and fatigue crack growth of copper–steel joints arc welded using nickel-base filler

Velu, M.; Bhat, Sunil

doi:10.1016/j.matdes.2014.11.026

Cited by 27 publications

(12 citation statements)

References 37 publications

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“…Suresh et al conducted a pioneering work of fatigue crack propagation experiments with bi‐material specimens: the crack propagation rate increases (or decreases) when the crack approaches the interface from the stronger (or weaker) side. Similar conclusions were further confirmed by other experiments . In the numerical field, Wang et al simulate the fatigue crack propagation towards plastically mismatched interface with cohesive zone model, where the degradation of cohesive strength is load history dependent.…”

Section: Introductionsupporting

confidence: 65%

“…Similar conclusions were further confirmed by other experiments. 1,13,[19][20][21][22][23][24][25][26] In the numerical field, Wang et al 27 simulate the fatigue crack propagation towards plastically mismatched interface with cohesive zone model, where the degradation of cohesive strength is load history dependent. Kolednick et al 4 numerically investigated the fatigue crack propagation in Pippan's experiments 20 with the crack tip stress intensity factor range ΔK tip , where ΔK tip = K max_tip − K min_tip .…”

Section: Introductionmentioning

confidence: 99%

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Plastic mismatch effect on plasticity induced crack closure: Fatigue crack propagation perpendicularly across a plastically mismatched interface

Song

Shang

Shi

et al. 2018

Fatigue Fract Eng Mat Struct

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In the present work, comprehensive investigation of both theoretical analysis and numerical simulation was carried out to investigate the plastic mismatch effect on plasticity induced crack closure (PICC) behavior and effective fatigue crack tip driving force. During the process of crack tip approaching interface, crack tip load and crack tip load ratio will change, resulting in the change of PICC degree. When the crack propagates towards higher strength side, Kop/Kmax increases; when the crack propagates towards lower strength side, Kop/Kmax decreases firstly and then increases. The two mechanisms of “interface plastic mismatch effect on nominal fatigue crack tip driving force” and “interface plastic mismatch effect on PICC degree” were compared. The second mechanism must be considered when building crack tip driving force model for describing fatigue crack crossing plastically mismatched interface, because it is more physically factual and maybe more important than the first mechanism.

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Section: Introductionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Plastic mismatch effect on plasticity induced crack closure: Fatigue crack propagation perpendicularly across a plastically mismatched interface

Song

Shang

Shi

et al. 2018

Fatigue Fract Eng Mat Struct

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“…In fact, owing to the similarity of Zr702 and TA2, the Zr702/TA2/Q345R composite plate can be classified into mismatched bimaterial system. 5,6 Normally, the composite material combines two or more different materials so that the finished product can meet the requirements of various working conditions. 7,8 Because of the differences of properties between combined materials, the performance of cracks in the composite material has always been the focus of research about the mismatched material.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the fatigue crack behavior of Zr702/TA2/Q345R composite plate with a crack normal to interface

Zhou

et al. 2019

Fatigue Fract Eng Mat Struct

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In this paper, the effects of maximum load, load ratio, and average load on fatigue crack propagation of Zr702/TA2/Q345R composite plate with a crack normal to the interface are studied by experiment and finite element method. When crack propagates to the interface from the compliant material side, the crack growth rate decreases to the minimum at first. After crack penetrates through the interface, the fatigue crack growth rate accelerates continuously. When crack propagates to the interface from the stiff material side, the fatigue crack growth rate generally increases with the crack length. Regardless of the direction of crack growth, the increase of load ratio will weaken the difference of crack growth rate near the interface caused by material property mismatch. Finite element results show that elastic modulus mismatch significantly changes the variation of the stress intensity factor amplitude. All results demonstrate that crack growth rate is dependent on the competition of the stress intensity factor amplitude, the fatigue crack growth rate in the corresponding material, and the interface strength.

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“…In the aerospace industry, in particular for the combustion chamber of rocket engines, copper and steel combinations off er perfect materials selection due to their combined high thermal conductivity and good stiff ness (Velu and Bhat 2015). Th e high thermal conductivity of copper tends to rapidly dissipate heat from the hot gases inside the combustor.…”

Section: Introductionmentioning

confidence: 99%

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

Carvalho¹,

Siqueira²,

Lima³

2019

J.Aerosp. Technol. Manag.

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Stainless steel and copper alloys joints are often applied in aerospace, marine and power industries where both high thermal and electrical conductivity (Cu) and corrosion resistance (steel) are required. In the aerospace industry, in particular for the combustion chamber of rocket engines, copper and steel combinations offer perfect materials selection due to their combined high thermal conductivity and good stiffness. In this work, laser welds were produced with intensity between 3.8 × 104 and 5.7 × 104 W/mm2 and a heat input between 72 and 108 J/mm, giving an aspect ratio of 1.8. The microstructure of the weld beads was marked by chemical heterogeneities due to the phase separation between Cu and Fe in the liquid state. The phase separation gave rise to globular precipitates which further transform due to a secondary precipitation at temperatures below 1000 °C. The steel side part of the weld presents around 20% Cu, leading to a liquation of the grain boundaries and cracking at high heat inputs. The hardness values situated between both base materials and the tensile shear behavior, when the weld is sufficiently tough, present strength up to 350 MPa and elongation up to 10%.

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Experimental investigations of fracture and fatigue crack growth of copper–steel joints arc welded using nickel-base filler

Cited by 27 publications

References 37 publications

Plastic mismatch effect on plasticity induced crack closure: Fatigue crack propagation perpendicularly across a plastically mismatched interface

Plastic mismatch effect on plasticity induced crack closure: Fatigue crack propagation perpendicularly across a plastically mismatched interface

Investigation on the fatigue crack behavior of Zr702/TA2/Q345R composite plate with a crack normal to interface

Phase Separation and Development of the Microstructure for Stainless Steel to Copper Alloy Weld Joints Using a Fiber Laser

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