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1
Content available The aspects of dimensioning of the construstions with use of the fracture mechanics
Ratanowski E.
Journal of Polish CIMAC
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2011
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Vol. 6, no 3
253-260
EN
In the first part of this work the classic strength effort hypothesis and their usefulness to dimensioning of the materials and constructions were characterised. There was given their small usefulness when the defects such as cracks are presented. In this situation very useful to dimensioning of the materials and constructions may be the fracture mechanics with their parameters and criterions. The further part of this work was devoted to characterising of the basic parameters and criterions of the fracture mechanics. Such parameters as stress intensity factor Kn , strain energy release rate G, crack tip opening displacement d (CTOD) and integral Rice – Čerepanov J and their criterions are presented. Last part is devoted to practical aspect of use of above parameters and criterions to dimensioning of the constructions.
2
Content available Relation between stress state and fracture resistance in mismatched weld joints
Ratanowski E.
Journal of Polish CIMAC
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2011
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Vol. 6, no 3
261-268
EN
After formulating a simplified model of under- and overmatched welded joints an analysis was made of stress at interface for the cases of perpendicular and non - perpendicular orientation of the zones (soft layer and hard layer) relative to the load action direction under tension. Conclusions from the theoretical analysis form a basis to an assessment of effort and fracture of the mismatched welded joints. Conditions for producing brittle and ductile fracture in mismatched welded joints in relation to geometrical conditions of the layer (W), expressed by k, and the mechanical properties of the layer materials, W e R , 0 R and equivalent stresses H s , v s are established in further experiments.
3
Content available Analysis of the heterogeneous weld joints in aspect of fracture mechanics
Ratanowski E.
Journal of Polish CIMAC
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2011
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Vol. 6, no 3
245-252
EN
This paper will discuss the issues relating to the effect of constraint on the fracture safe design. At first the attention is focused on the relation between the microstructure and selected mechanical properties. This aspect is illustrated with presenting a brief consideration of the constraint effect in relation: microstructure - mechanical properties in microscopic scale. The same problem is account in macroscopic scale of the heterogeneous weld joints. After formulating a simplified model of mismatched weld joints a concise review of stress was made at interfaces between zones (W) and (B). Conclusions from above analysis form a constraint parameters un / ov R K which were used to an assessment of the fracture parameters as ratio of driving forces un / ov R d by modified of the classical solution presented by Engineering Treatment Model (E-T-M).
4
Content available remote Relation Structure - Fracture Resistance in Process of Estimate the Weldability of Low Alloy Steels: Part II
Ratanowski E.
Advances in Materials Science
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2010
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Vol. 10, nr 4(26)
41-47
EN
Numerical weldability analysis is a new powerful research and development tool which is useful for metallurgistics technologist and design engineers. Saying strictly the numerical analysis of weldability comprises thermodynamic, thermomechanical and microstructural modelling of the welding process. The fracture resistance of welded joints is mainly characterised by normalised parameters: for cold cracking or in the exploitation condition. Conclusions from the theoretical analysis form a basis to an assessment measure of the stress state parameter Sp as a physical measure of the deformation and effort of the mismatched weld joints. There also was made characteristic of the effect on the inclination of the layer (W) on the form of fracture. Finally, some aspects of estimation of the KC and KIC values for the layer (W) with the SINTAP programme overview are presented.
5
Content available remote Relation Structure - Fracture Resistance in Process of Estimate the Weldability of Low Alloy Steels: Part I
Ratanowski E.
Advances in Materials Science
|
2010
|
Vol. 10, nr 4(26)
32-40
EN
The relationship between microstructure and mechanical properties of structural materials is still relevant problem in the theory of materials science and mechanical engineering. The question is how the macro-mechanical parameters can be derived from the microscale mechanisms taking into account local structural heterogeneities. Another question is how to make quantitative descriptions of the strength and toughness properties of welded joints made of non-matching weld metal. These problems are the objects of welding and mechanical investigation and they are related to estimation of weldability. The results of this study concern the evaluation stress state at interface of the under- and overmatched weld joints. After formulating a simplified model of under- and overmatched weld joints an analysis was made of stress at interface for the cases of perpendicular and non - perpendicular orientation of the zones (soft - layer and hard - layer) relative to the load action direction under tension.
6
Content available remote Weldability of titanium and its alloys progress in joining
Ratanowski E.
Advances in Materials Science
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2008
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Vol. 8, nr 2(16)
69-76
EN
The weldability aspects of the some advances materials, such as Titanium and its alloys: Titanium Aluminide - Intermetallics, still require further research and development. The power beam welding processes are considered in this work since these processes are capable of joining a wide range of new materials of interest in aerospace industry as well as in the many other industrial applications and offer remarkable advantages over conventional fusion welding processes. In this paper have been defined the following questions: - the weldability of Ti and its alloys, a new class of titanium alloys and their weldability, welding metallurgy and processes for joining.
7
Content available remote Użyteczność obliczeniowej mechaniki spawania w procesie kształtowania technologii
Ratanowski E.
Advances in Materials Science
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2008
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Vol. 8, nr 2(16)
61-68
PL
Bazując na Obliczeniowej Mechanice Spawania (OMS) scharakteryzowano wzajemne oddziaływanie cieplno-mechaniczne w procesie spawania. Celem OMS jest rozszerzenie możliwości analizy: temperatury, naprężeń i odkształceń razem z ewolucją mikrostruktury w procesie spawania. W dalszej kolejności określono aktualny stan relacji pomiędzy modułami: cieplnym, mikrostrukturą i mechanicznym. Pozwoliło to ustalić metodykę badań spawalności materiałów i konstrukcji, opartą o metodę obliczeniową.
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