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Gantner Instruments
Stress and Fatigue Analysis

Stress and Fatigue Analysis

Product catalog summary

Thermal Load Definition
Thermal loads are defined based on data from process automation systems or dedicated monitoring systems. If using normal process instrumentation, fluid temperature and heat transfer coefficients are specified. For data from monitoring systems with external temperature sensors, Fourier’s heat transfer equation is solved inversely.

Stress and Fatigue Analysis
Gantner Instruments provides stress and fatigue analysis for components subjected to thermal transients in power and industrial plants. The analysis adheres to standards such as ASME Section III NB3200, RCC-M B3200, KTA 3201.2 / 3211.2, and NUREG / CR-6909.

Finite Element Modelling
A detailed finite-element model is created for thermal and mechanical analysis using the Code_Aster solver. The thermal transient field is used for stress and strain calculations, evaluating stress tensors and determining stress ranges according to Tresca or von Mises criteria.

Mechanical Analysis
Stress is linearized on evaluation sections to determine if an elastic or simplified elastic-plastic analysis is needed. The analysis considers plasticity and weld seam factors in compliance with relevant codes and standards.

Fatigue Analysis
Alternate stress for each transient is determined using peak-valley or rainflow algorithms. The allowable number of cycles is derived from fatigue curves, ensuring the sum of partial usage factors remains below 1 to prevent fatigue damage.

Environmentally Assisted Fatigue
Research focuses on medium effects on fatigue lifetime, incorporating experimental fatigue curves or numerical correction factors (Fen) in evaluations.

Additional Information
Gantner Instruments operates in multiple countries, providing test and measurement technology tailored to client needs.

Catalog excerpts

Stress & Fatigue Analysis For Piping, Valves, Vessels, Heat Exchangers

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Stress and Fatigue Analysis for Thermal Transient Loaded Mechanical Components Gantner Instruments engineering service provides stress and fatigue analysis for thermal transient loaded components of power plants or other industrial plants and applications. Stress & Fatigue Evaluation According to Codes & Standards: SME Section III NB3200 A CC-M B3200 R TA 3201.2 / 3211.2 K UREG / CR-6909 N Thermal Load Definition Based on thermal loads gathered by the process automation system or dedicated monitoring system, transients for the a nalysis are created. In case input data from the normal process...

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Finite Element Software For the thermal and mechanical analysis a detailed finite-element model is created. Mechanical Analysis The thermal transient field of the analyzed pipe or component is used for the stress & strain calculation. The complete stress tensor (normal & shear stress) is evaluated and stress ranges according to Tresca or von Mises are determined under consideration of plasticity factors, weld seam factors in compliance with the codes & standards. Stress is linearized on evaluation sections, the comparison with the allowable stress limit will inform if an elastic (Ke=1) or a simplified...

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