ESI Releases SYSTUS 2017 Dedicated to the Energy Sector

3 Aug 2017, Software for the Testing of Thermomechanical and Multi-physical Behaviors of Components

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Paris, France – August 3, 2017 – ESI Group, leading innovator in Virtual Prototyping software and services for manufacturing industries, announces the latest version of SYSTUS, proven software solution for thermomechanical design and regulatory analyses in the Nuclear sector. ESI SYSTUS 2017 brings significant new capabilities to the software, including an innovative Differential Method (RCCM-MD). The version also brings enhancements to investigate fracture mechanics using the innovative X-FEM method, and addresses topology optimization for many applications, including in the automotive and aeronautic sectors. 

ESI Releases SYSTUS 2017 Dedicated to the Energy Sector

SYSTUS benefits from 40 years of R&D in Finite Elements Analysis (FEA). The software was originally developed by Framatome (now AREVA NP) to support the design of their nuclear power plants and to perform regulatory analyses — all virtually. Today, SYSTUS has become an industry-proven solution for an extensive range of regulatory analyses mandated by international standards for nuclear engineering. It specifically addresses the requirements of the ASME code[1], standard issued by the American Society of Mechanical Engineers, and the French standard, published by AFCEN and known as RCC-M (Règles de Conception et de Construction des Matériels Mécaniques des Ilots Nucléaires2 REP3).

SYSTUS 2017 brings new enhancements for conducting regulatory analyses, including new analytic options, and a better legibility of results. It introduces a Differential Method (RCCM-MD) for second category analyses that can help industrial manufacturers and their suppliers overcome major issues related to load changes over time and variations in the directions of principal stresses, as these interfere with the computation of the amplitude of the equivalent stresses Sn and the usage factor U.

In the field of fracture mechanics, SYSTUS allows industrial manufacturers and their suppliers to perform brittle and ductile fracture analysis. Working with AREVA for over 6 years, the ESI SYSTUS team has developed an innovative eXtended Finite Elements method (X-FEM) that enables the analysis of defects without the need to model the cracks explicitly — hence reducing complexity and saving time. With ESI’s X-FEM method, the representation of defects is carried out using the Level-Set Method and specific enrichment functions.

SYSTUS 2017 includes enhancements for fracture mechanics with the X-FEM method, including new and simplified commands to improve software ergonomics. The version delivers strong efficiency improvements and offers results very close to those obtained with Finite Element Method (FEM) analysis with meshed cracks. Furthermore, with SYSTUS 2017, the X-FEM method now takes into account plasticity, includes meshing with quadratic elements, and enables the computation of the Energy rate using the Theta method. 

Finally, SYSTUS 2017 addresses specific needs in the automotive and aeronautic industries for the first time by offering shape optimization. Here, SYSTUS provides mathematical solutions based on the level-set technology and enables manufacturers to access precisely the optimal shape.

1 ASME code : Section III, division 1, article NB 3200
2 RCC-M = Règles de Conception et de Construction des Matériels Mécaniques des Ilots Nucléaires. In English: Design and construction rules for mechanical components of PWR nuclear islands
3 REP = Réacteur à Eau Pressurisée. In English: Pressurized Water Reactor.
See RCC-M : Paragraph B3200

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About ESI Group

ESI Group is a leading innovator in Virtual Prototyping software and services. Specialist in material physics, ESI has developed a unique proficiency in helping industrial manufacturers replace physical prototypes by virtually replicating the fabrication, assembly and testing of products in different environments. Today, coupled with Virtual Reality, animated by systems models, and benefiting from data analytics, Virtual Prototyping becomes immersive and interactive: ESI’s clients can bring their products to life, ensuring reliable performance, serviceability and maintainability. ESI solutions help world-leading OEM’s and innovative companies make sure that their products will pass certification tests - before any physical prototype is built - and that new products are competitive in their market space. Virtual Prototyping addresses the emerging need for products to be smart and autonomous and supports industrial manufacturers in their digital transformation.

Today, ESI’s customer base spans nearly every industry sector. The company employs about 1100 high-level specialists worldwide to address the needs of customers in more than 40 countries. For more information, please visit

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