On Microstructure and Dynamic Fracture Toughness of Weld Metals PDF Download

Author: Ping Yong
Publisher:
ISBN:
Category :
Languages : en
Pages : 514

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Author: Stephen M. Graham
Publisher:
ISBN: 9781423527633
Category :
Languages : en
Pages : 92

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Welds in marine structures are typically fabricated such that the yield strength of the weld metal is higher than the base plate (over-matched). Allowing the weld metal yield strength to be less than the base metal (under- matching) can increase productivity and weld metal toughness; however, there is some concern that under-matching increases the crack driving force and decreases the weld metal tearing resistance. This study examined fracture behavior of two HY-100 under-matched welds under dynamic loading. A new test fixture that provided greater control of specimen deflection during impact testing of SE(B) specimens was developed, as was a procedure for applying the Normalization Method to the analysis of dynamic fracture toughness tests. Successful application of Normalization involved using multiple specimens with varying ductile crack growth to establish the correct form for the plasticity function. The accuracy of the measured J(sub Id) was verified by comparing with multi- specimen J(sub Id) values. The results from these tests showed that the proximity of the crack tip to the fusion line had more effect on fracture behavior than mismatch level. Narrower fusion line margins led to lower tearing resistance and a greater propensity for fracture instability.

Author: M. G. Dawes
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 349

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Author: Welding Institute
Publisher:
ISBN:
Category : Fracture mechanics
Languages : en
Pages : 364

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Author: Welding institute
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Author: P. C. Hughes
Publisher:
ISBN:
Category :
Languages : en
Pages : 8

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A series of multi-run submerged arc welds produced with conventional commercial wires and fluxes was evaluated by Charpy V notch and COD tests. Ductile fracture energy is raised and transition temperature lowered by increasing the weld metal Mn/Si ratio to about 2. The COD transition temperature increases with increasing weld metal yield strength. The strain rate sensitivity of the welds, as indicated by the rise in COD transition temperature on testing at a dynamic rather than quasi-static loading rate, increases as weld metal strength decreases. No controlling influence of as-deposited microstructure on fracture toughness was evident in the range of weld metals examined. (Author).

Author: T. Ochiai
Publisher:
ISBN:
Category : Brittle fracture
Languages : en
Pages : 34

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Fracture toughness properties of structural steels of 490-MPa strength class and weld metals under dynamic loading are studied in the light of the near crack tip stress fields. The loading rate in toughness tests range from 0.1 to 500 mm/s. The near-tip stress fields are analyzed by 3D-FEM considering the strain rate effect on the flow properties of materials. Temperature rise caused by high-speed plastic deformation is also included in the FE analysis. The critical CTOD at brittle fracture initiation decreases when increasing the loading rate. This is due to the elevation of a local stress near the crack tip. The local approach is applied to the dynamic fracture toughness evaluation. It is shown that the brittle fracture resistance evaluated in terms of the Weibull stress, an integrated stress over a highly stressed region near the crack tip, is a material property independent of the loading rate. Based on the Weibull stress fracture criterion, the dynamic fracture toughness can be predicted from static toughness results. An engineering procedure to estimate the loading rate effect on the fracture toughness is also presented.

Author: K. Salama
Publisher: Elsevier
ISBN: 1483294064
Category : Technology & Engineering
Languages : en
Pages : 3063

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Held every four years, the International Congress on Fracture is the premier international forum for the exchange of ideas between scientists and engineers involved in producing and using materials resistant to fracture and fatigue. This major six-volume work which forms the proceedings of the Seventh International Congress on Fracture therefore provides the most comprehensive account available of the current status of research into fracture and fatigue, and the application of this knowledge to the design, fabrication and operation of materials and structures. As such, it will be an essential reference for materials scientists and mechanical, structural, aeronautical and design engineers with an interest in fracture and its prevention.

Author: Alan F. Liu
Publisher: ASM International
ISBN: 1615032525
Category : Technology & Engineering
Languages : en
Pages : 452

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Author: Thomas Michael Breunig
Publisher:
ISBN:
Category : Metals
Languages : en
Pages : 236

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