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FE Based Fatigue, Durability&Random Response Solution

Fatigue provides unique capabilities for optimizing designs based on durability criteria. MSC Fatigue allows fatigue failure analysis of a structure under prolonged exposure to time-varying loads, providing unique design and optimization capabilities, including durability requirements, for product life under normal and experimental operating conditions.

MSC Fatigue is based on many years of theoretical and experimental research conducted by MSC Software and nCode Intrernational Ltd.

Fatigue life and service life analysis is based either on results of finite element calculations performed by MSC Nastran or Marc systems or on experimental data as well as fatigue characteristics of materials.

The single integrating environment for endurance analysis is Patran, where results of previous finite element analysis are processed or experimental results are input, and loading histories, material properties and MSC Fatigue calculation task parameters are defined, solution progress is controlled, and analysis results are visualized and analyzed.

Finite element analysis of the product can be performed in time or frequency domain.

MSC Fatigue offers the following methods for endurance analysis:

  • Nominal stress method (Stress Life, S-N analysis);
  • nominal strain method (Strain Life, E-N analysis);
  • analysis of crack growth rate (Fatigue Fracture module).

Stress Life – examines the total lifetime of a structure without separate consideration of the phases of crack formation and growth. A fatigue curve (Wehler) is used in the “Stress Rate – Number of Cycles to Failure” space. The method is applicable in cases where the structure deforms mainly linearly; plastic deformations are very localized. It is called multi-cycle fatigue failure (with more than 50,000-100,000 cycles to failure). Durability analysis of welded joints for spot and seam welding can be performed. MSC Fatigue also has a handy module FatigueWheels – S-N analysis of durability of rotating structures (wheels, discs, etc.).

S-N calculations can take into account:

  • the presence of some average (constant, background) stress level in the structure;
  • factor of stress concentration;
    scale factor;
  • a factor of the type of the stressed state in the investigated area;
  • impact of surface treatment quality;
  • influence of the surface hardening used;
  • probabilistic nature of the used fatigue characteristic.

Strain life – analysis of the time of the product functioning until the formation of cracks of significant, from the engineer’s point of view, dimensions in it. Cyclic material curve and fatigue curve in strain rate – number of cycles to failure space are used. It can be applied in the presence of medium level plastic deformations in the structure. It is the so-called low cycle fatigue failure with up to 100,000 cycles to failure. In multicyclic fatigue calculations, the number of full cycles forming hysteresis loops is taken into account, with cycles of sufficiently large area making the most significant contribution to the fatigue damage of structures. The “rain method” cycle schematization algorithms in MSC Fatigue are optimal for use in calculations of structural damageability by the crack initiation method.

E-N calculations can take into account:

  • The presence of some average (constant, background) stress level in the structure;
    a stress concentration factor;
    scale factor;
  • a factor of the type of the stressed state in the investigated area;
  • influence of surface treatment quality;
  • influence of the surface hardening used;
  • probabilistic nature of the used fatigue characteristic;

Fatigue Fracture – analysis of crack development to specified or destructive dimensions. Initial crack size can be specified. Fatigue fracture diagram in coordinates “rate of crack growth – spread of stress intensity coefficient” is used. The stress rate coefficient for the most typical areas of engineering structures can be obtained from the library of correction functions supplied with MSC Fatigue. The effective stress rate coefficient is used. The calculation shall take into account:

  • The crack closure phenomenon (Elber effect);
    history effects (including the effect of single overstressing loads);
  • contribution of static loads into the fracture process;
  • possibility of crack growth from a preceding defect;
  • Influence of operating conditions (environment);
  • the actual sequence of cycles in the loading history.

MSC Fatigue has an extensive set of service utilities – more than 50 special procedures, each of which can be run either from the Patran environment or independently. The utilities provide easy and convenient setting, editing, examination of input data, different modes of signal import, filtering and display, as well as provide a wide range of possibilities for processing the obtained results at different stages of the analysis of the structure durability.

MSC Fatigue reduces product development time and eliminates the cost of eliminating fatigue damage and fracture early in the design process, and provides the ability to analyze the effects of in-service damage on design life.

You can request a trial version of the full KISSsoft package for testing. The trial is followed with a technical demonstration aimed on software abilities and focused on your design and manufacturing purposes.

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GloBAS Engineering Team

UAE, Dubai, P.O.Box 43585

Phone: +971 056 240 6055